/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/loop-invgen/down.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 18:14:59,119 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 18:14:59,121 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 18:14:59,157 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 18:14:59,195 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 18:14:59,195 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 18:14:59,197 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 18:14:59,198 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-20 18:14:59,206 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 18:14:59,206 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 18:14:59,207 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 18:14:59,207 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 18:14:59,208 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 18:14:59,208 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 18:14:59,208 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 18:14:59,208 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 18:14:59,209 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 18:14:59,209 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 18:14:59,209 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 18:14:59,209 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 18:14:59,209 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 18:14:59,210 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 18:14:59,210 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 18:14:59,210 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 18:14:59,210 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 18:14:59,211 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 18:14:59,211 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 18:14:59,211 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 18:14:59,211 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 18:14:59,211 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-20 18:14:59,212 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 18:14:59,453 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 18:14:59,482 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 18:14:59,484 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 18:14:59,485 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 18:14:59,487 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 18:14:59,489 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/down.i [2022-03-20 18:14:59,549 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c5ed733cd/1c0decfc4dae4ee8a75e120723a11146/FLAG4b5447ee0 [2022-03-20 18:14:59,963 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 18:14:59,964 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/down.i [2022-03-20 18:14:59,969 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c5ed733cd/1c0decfc4dae4ee8a75e120723a11146/FLAG4b5447ee0 [2022-03-20 18:14:59,989 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c5ed733cd/1c0decfc4dae4ee8a75e120723a11146 [2022-03-20 18:14:59,992 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 18:14:59,995 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 18:14:59,997 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 18:14:59,998 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 18:15:00,001 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 18:15:00,002 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 06:14:59" (1/1) ... [2022-03-20 18:15:00,004 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@beca596 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:00, skipping insertion in model container [2022-03-20 18:15:00,004 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 06:14:59" (1/1) ... [2022-03-20 18:15:00,014 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 18:15:00,028 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 18:15:00,219 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/down.i[893,906] [2022-03-20 18:15:00,236 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 18:15:00,245 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 18:15:00,257 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/down.i[893,906] [2022-03-20 18:15:00,261 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 18:15:00,274 INFO L208 MainTranslator]: Completed translation [2022-03-20 18:15:00,275 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:00 WrapperNode [2022-03-20 18:15:00,275 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 18:15:00,276 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 18:15:00,276 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 18:15:00,276 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 18:15:00,286 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:00" (1/1) ... [2022-03-20 18:15:00,286 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:00" (1/1) ... [2022-03-20 18:15:00,293 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:00" (1/1) ... [2022-03-20 18:15:00,293 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:00" (1/1) ... [2022-03-20 18:15:00,305 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:00" (1/1) ... [2022-03-20 18:15:00,310 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:00" (1/1) ... [2022-03-20 18:15:00,316 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:00" (1/1) ... [2022-03-20 18:15:00,319 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 18:15:00,320 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 18:15:00,320 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 18:15:00,321 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 18:15:00,321 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:00" (1/1) ... [2022-03-20 18:15:00,329 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 18:15:00,339 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:15:00,357 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-20 18:15:00,376 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-20 18:15:00,392 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 18:15:00,392 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 18:15:00,392 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 18:15:00,392 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-20 18:15:00,392 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 18:15:00,393 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 18:15:00,393 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 18:15:00,393 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 18:15:00,393 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2022-03-20 18:15:00,393 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2022-03-20 18:15:00,393 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 18:15:00,393 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 18:15:00,393 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-20 18:15:00,393 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 18:15:00,394 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-03-20 18:15:00,394 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 18:15:00,394 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 18:15:00,394 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 18:15:00,394 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 18:15:00,394 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 18:15:00,394 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 18:15:00,394 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 18:15:00,451 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 18:15:00,453 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 18:15:00,607 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 18:15:00,612 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 18:15:00,612 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-03-20 18:15:00,613 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 06:15:00 BoogieIcfgContainer [2022-03-20 18:15:00,613 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 18:15:00,615 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 18:15:00,615 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 18:15:00,618 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 18:15:00,618 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 06:14:59" (1/3) ... [2022-03-20 18:15:00,619 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@21faeb1f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 06:15:00, skipping insertion in model container [2022-03-20 18:15:00,619 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:00" (2/3) ... [2022-03-20 18:15:00,619 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@21faeb1f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 06:15:00, skipping insertion in model container [2022-03-20 18:15:00,619 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 06:15:00" (3/3) ... [2022-03-20 18:15:00,620 INFO L111 eAbstractionObserver]: Analyzing ICFG down.i [2022-03-20 18:15:00,625 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 18:15:00,625 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 18:15:00,661 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 18:15:00,667 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-20 18:15:00,667 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 18:15:00,678 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-20 18:15:00,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-03-20 18:15:00,684 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:00,685 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:00,685 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:00,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:00,690 INFO L85 PathProgramCache]: Analyzing trace with hash 991123303, now seen corresponding path program 1 times [2022-03-20 18:15:00,696 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:00,697 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2036184450] [2022-03-20 18:15:00,706 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:15:00,707 INFO L85 PathProgramCache]: Analyzing trace with hash 991123303, now seen corresponding path program 2 times [2022-03-20 18:15:00,709 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:00,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1694651823] [2022-03-20 18:15:00,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:00,710 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:00,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:00,907 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:00,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:00,927 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:00,928 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:00,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1694651823] [2022-03-20 18:15:00,929 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1694651823] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:00,930 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:00,930 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:15:00,932 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:00,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2036184450] [2022-03-20 18:15:00,934 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2036184450] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:00,935 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:00,935 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:15:00,935 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116947499] [2022-03-20 18:15:00,937 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:00,941 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 18:15:00,942 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:00,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 18:15:00,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-20 18:15:00,975 INFO L87 Difference]: Start difference. First operand has 22 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 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 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:01,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:01,123 INFO L93 Difference]: Finished difference Result 43 states and 54 transitions. [2022-03-20 18:15:01,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 18:15:01,126 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2022-03-20 18:15:01,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:01,131 INFO L225 Difference]: With dead ends: 43 [2022-03-20 18:15:01,131 INFO L226 Difference]: Without dead ends: 18 [2022-03-20 18:15:01,134 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2022-03-20 18:15:01,137 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 33 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:01,138 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 39 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:15:01,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-03-20 18:15:01,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-03-20 18:15:01,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:01,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2022-03-20 18:15:01,189 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2022-03-20 18:15:01,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:01,190 INFO L478 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2022-03-20 18:15:01,190 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:01,190 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2022-03-20 18:15:01,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-03-20 18:15:01,191 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:01,191 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:01,191 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 18:15:01,191 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:01,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:01,192 INFO L85 PathProgramCache]: Analyzing trace with hash -1458852147, now seen corresponding path program 1 times [2022-03-20 18:15:01,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:01,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [376715780] [2022-03-20 18:15:01,575 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:01,576 INFO L85 PathProgramCache]: Analyzing trace with hash -801648754, now seen corresponding path program 1 times [2022-03-20 18:15:01,577 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:01,577 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1769190920] [2022-03-20 18:15:01,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:01,577 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:01,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:01,657 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:01,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:01,688 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:01,689 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:01,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1769190920] [2022-03-20 18:15:01,689 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1769190920] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:01,689 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:01,689 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:01,726 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:01,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [376715780] [2022-03-20 18:15:01,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [376715780] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:01,727 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:01,727 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:01,727 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378185994] [2022-03-20 18:15:01,727 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:01,728 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 18:15:01,728 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:01,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 18:15:01,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2022-03-20 18:15:01,729 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 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) [2022-03-20 18:15:01,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:01,828 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2022-03-20 18:15:01,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 18:15:01,829 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 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 [2022-03-20 18:15:01,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:01,832 INFO L225 Difference]: With dead ends: 29 [2022-03-20 18:15:01,832 INFO L226 Difference]: Without dead ends: 19 [2022-03-20 18:15:01,835 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2022-03-20 18:15:01,838 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:01,843 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 37 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:15:01,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-03-20 18:15:01,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-03-20 18:15:01,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:01,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2022-03-20 18:15:01,853 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2022-03-20 18:15:01,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:01,853 INFO L478 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2022-03-20 18:15:01,853 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 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) [2022-03-20 18:15:01,854 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2022-03-20 18:15:01,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-20 18:15:01,854 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:01,854 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:01,855 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-20 18:15:01,855 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:01,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:01,855 INFO L85 PathProgramCache]: Analyzing trace with hash -98679769, now seen corresponding path program 2 times [2022-03-20 18:15:01,856 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:01,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2088530926] [2022-03-20 18:15:02,021 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:02,024 INFO L85 PathProgramCache]: Analyzing trace with hash 164011982, now seen corresponding path program 1 times [2022-03-20 18:15:02,024 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:02,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1968451776] [2022-03-20 18:15:02,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:02,024 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:02,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:02,091 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:02,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:02,098 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:02,098 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:02,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1968451776] [2022-03-20 18:15:02,099 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1968451776] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:02,099 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:02,099 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:02,140 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:02,140 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2088530926] [2022-03-20 18:15:02,141 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2088530926] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:02,141 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:02,141 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:15:02,141 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266853172] [2022-03-20 18:15:02,141 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:02,142 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:15:02,142 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:02,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:15:02,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2022-03-20 18:15:02,143 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:02,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:02,257 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2022-03-20 18:15:02,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 18:15:02,257 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-03-20 18:15:02,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:02,259 INFO L225 Difference]: With dead ends: 30 [2022-03-20 18:15:02,259 INFO L226 Difference]: Without dead ends: 20 [2022-03-20 18:15:02,260 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2022-03-20 18:15:02,263 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:02,264 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 42 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:15:02,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-03-20 18:15:02,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-03-20 18:15:02,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:02,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2022-03-20 18:15:02,269 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 15 [2022-03-20 18:15:02,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:02,270 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2022-03-20 18:15:02,270 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:02,270 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2022-03-20 18:15:02,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-03-20 18:15:02,270 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:02,271 INFO L499 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:02,271 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-20 18:15:02,271 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:02,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:02,271 INFO L85 PathProgramCache]: Analyzing trace with hash -883009011, now seen corresponding path program 3 times [2022-03-20 18:15:02,272 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:02,272 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [103611105] [2022-03-20 18:15:02,420 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:02,421 INFO L85 PathProgramCache]: Analyzing trace with hash 1129672718, now seen corresponding path program 1 times [2022-03-20 18:15:02,422 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:02,422 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657172749] [2022-03-20 18:15:02,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:02,422 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:02,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:02,474 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:02,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:02,480 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:02,480 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:02,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657172749] [2022-03-20 18:15:02,481 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [657172749] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:02,481 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:02,481 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:02,526 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:02,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [103611105] [2022-03-20 18:15:02,526 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [103611105] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:02,526 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:02,527 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 18:15:02,527 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322651401] [2022-03-20 18:15:02,527 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:02,527 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 18:15:02,527 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:02,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 18:15:02,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2022-03-20 18:15:02,528 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 9 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:02,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:02,637 INFO L93 Difference]: Finished difference Result 31 states and 33 transitions. [2022-03-20 18:15:02,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 18:15:02,638 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (3), 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 16 [2022-03-20 18:15:02,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:02,638 INFO L225 Difference]: With dead ends: 31 [2022-03-20 18:15:02,638 INFO L226 Difference]: Without dead ends: 21 [2022-03-20 18:15:02,639 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2022-03-20 18:15:02,640 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:02,640 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 47 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:15:02,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-03-20 18:15:02,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-03-20 18:15:02,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:02,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2022-03-20 18:15:02,645 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 16 [2022-03-20 18:15:02,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:02,646 INFO L478 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2022-03-20 18:15:02,646 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:02,646 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2022-03-20 18:15:02,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-20 18:15:02,647 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:02,647 INFO L499 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:02,647 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-03-20 18:15:02,647 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:02,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:02,648 INFO L85 PathProgramCache]: Analyzing trace with hash 572588263, now seen corresponding path program 4 times [2022-03-20 18:15:02,648 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:02,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2051008722] [2022-03-20 18:15:02,894 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:02,895 INFO L85 PathProgramCache]: Analyzing trace with hash 2095333454, now seen corresponding path program 1 times [2022-03-20 18:15:02,895 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:02,895 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411596149] [2022-03-20 18:15:02,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:02,896 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:02,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:02,941 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:02,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:02,955 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:02,956 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:02,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [411596149] [2022-03-20 18:15:02,956 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [411596149] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:02,956 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:02,956 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:03,034 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:03,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2051008722] [2022-03-20 18:15:03,034 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2051008722] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:03,034 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:03,034 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 18:15:03,035 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [714889749] [2022-03-20 18:15:03,035 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:03,035 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 18:15:03,035 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:03,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 18:15:03,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2022-03-20 18:15:03,036 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 10 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) [2022-03-20 18:15:03,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:03,153 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2022-03-20 18:15:03,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 18:15:03,154 INFO L78 Accepts]: Start accepts. Automaton has has 10 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 [2022-03-20 18:15:03,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:03,154 INFO L225 Difference]: With dead ends: 32 [2022-03-20 18:15:03,154 INFO L226 Difference]: Without dead ends: 22 [2022-03-20 18:15:03,155 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2022-03-20 18:15:03,156 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:03,156 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 52 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:15:03,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-03-20 18:15:03,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-03-20 18:15:03,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:03,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2022-03-20 18:15:03,161 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 17 [2022-03-20 18:15:03,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:03,161 INFO L478 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2022-03-20 18:15:03,161 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 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) [2022-03-20 18:15:03,161 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2022-03-20 18:15:03,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-20 18:15:03,162 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:03,162 INFO L499 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:03,162 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-03-20 18:15:03,162 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:03,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:03,163 INFO L85 PathProgramCache]: Analyzing trace with hash -1548536499, now seen corresponding path program 5 times [2022-03-20 18:15:03,163 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:03,163 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2095348492] [2022-03-20 18:15:03,302 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:03,303 INFO L85 PathProgramCache]: Analyzing trace with hash -1233973106, now seen corresponding path program 1 times [2022-03-20 18:15:03,303 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:03,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773024849] [2022-03-20 18:15:03,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:03,304 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:03,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:03,361 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:03,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:03,372 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:03,372 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:03,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773024849] [2022-03-20 18:15:03,373 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1773024849] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:03,373 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:03,373 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:03,458 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:03,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2095348492] [2022-03-20 18:15:03,459 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2095348492] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:03,459 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:03,459 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 18:15:03,459 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979067737] [2022-03-20 18:15:03,459 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:03,460 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 18:15:03,460 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:03,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 18:15:03,460 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2022-03-20 18:15:03,460 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 11 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:03,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:03,610 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2022-03-20 18:15:03,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 18:15:03,611 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 2 states have call successors, (3), 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 18 [2022-03-20 18:15:03,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:03,611 INFO L225 Difference]: With dead ends: 33 [2022-03-20 18:15:03,611 INFO L226 Difference]: Without dead ends: 23 [2022-03-20 18:15:03,612 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2022-03-20 18:15:03,612 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:03,613 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 57 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:15:03,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-20 18:15:03,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-03-20 18:15:03,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:03,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2022-03-20 18:15:03,617 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 18 [2022-03-20 18:15:03,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:03,618 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2022-03-20 18:15:03,618 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:03,618 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2022-03-20 18:15:03,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-20 18:15:03,618 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:03,618 INFO L499 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:03,619 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-03-20 18:15:03,619 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:03,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:03,619 INFO L85 PathProgramCache]: Analyzing trace with hash 1416072615, now seen corresponding path program 6 times [2022-03-20 18:15:03,619 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:03,619 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1828726181] [2022-03-20 18:15:03,789 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:03,789 INFO L85 PathProgramCache]: Analyzing trace with hash -268312370, now seen corresponding path program 1 times [2022-03-20 18:15:03,789 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:03,790 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205524272] [2022-03-20 18:15:03,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:03,790 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:03,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:03,855 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:03,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:03,863 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:03,863 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:03,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [205524272] [2022-03-20 18:15:03,863 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [205524272] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:03,863 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:03,864 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:03,960 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:03,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1828726181] [2022-03-20 18:15:03,961 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1828726181] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:03,961 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:03,961 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 18:15:03,961 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32708423] [2022-03-20 18:15:03,962 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:03,962 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 18:15:03,962 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:03,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 18:15:03,962 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2022-03-20 18:15:03,963 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 12 states, 12 states have (on average 1.25) internal successors, (15), 11 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:04,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:04,131 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2022-03-20 18:15:04,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 18:15:04,131 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.25) internal successors, (15), 11 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2022-03-20 18:15:04,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:04,133 INFO L225 Difference]: With dead ends: 34 [2022-03-20 18:15:04,133 INFO L226 Difference]: Without dead ends: 24 [2022-03-20 18:15:04,133 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2022-03-20 18:15:04,134 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:04,135 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 62 Invalid, 183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:15:04,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-03-20 18:15:04,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-03-20 18:15:04,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:04,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2022-03-20 18:15:04,163 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2022-03-20 18:15:04,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:04,164 INFO L478 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2022-03-20 18:15:04,164 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.25) internal successors, (15), 11 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:04,164 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2022-03-20 18:15:04,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-20 18:15:04,164 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:04,165 INFO L499 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:04,165 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-03-20 18:15:04,165 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:04,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:04,166 INFO L85 PathProgramCache]: Analyzing trace with hash -1170325363, now seen corresponding path program 7 times [2022-03-20 18:15:04,166 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:04,166 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [658838196] [2022-03-20 18:15:04,318 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:04,318 INFO L85 PathProgramCache]: Analyzing trace with hash 697348366, now seen corresponding path program 1 times [2022-03-20 18:15:04,318 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:04,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [981352829] [2022-03-20 18:15:04,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:04,319 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:04,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:04,358 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:04,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:04,363 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:04,363 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:04,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [981352829] [2022-03-20 18:15:04,363 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [981352829] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:04,363 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:04,363 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:04,463 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:04,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [658838196] [2022-03-20 18:15:04,465 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [658838196] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:04,465 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:04,465 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 18:15:04,465 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867638770] [2022-03-20 18:15:04,465 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:04,466 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 18:15:04,466 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:04,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 18:15:04,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2022-03-20 18:15:04,467 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 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) [2022-03-20 18:15:04,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:04,666 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2022-03-20 18:15:04,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 18:15:04,667 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 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 [2022-03-20 18:15:04,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:04,667 INFO L225 Difference]: With dead ends: 35 [2022-03-20 18:15:04,667 INFO L226 Difference]: Without dead ends: 25 [2022-03-20 18:15:04,668 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2022-03-20 18:15:04,668 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:04,669 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 67 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 203 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:15:04,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-03-20 18:15:04,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-03-20 18:15:04,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:04,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2022-03-20 18:15:04,673 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 20 [2022-03-20 18:15:04,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:04,674 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2022-03-20 18:15:04,674 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 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) [2022-03-20 18:15:04,674 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2022-03-20 18:15:04,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-20 18:15:04,674 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:04,674 INFO L499 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:04,675 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-03-20 18:15:04,675 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:04,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:04,675 INFO L85 PathProgramCache]: Analyzing trace with hash 255715943, now seen corresponding path program 8 times [2022-03-20 18:15:04,675 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:04,675 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1697503280] [2022-03-20 18:15:04,837 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:04,838 INFO L85 PathProgramCache]: Analyzing trace with hash 1663009102, now seen corresponding path program 1 times [2022-03-20 18:15:04,838 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:04,838 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2131421079] [2022-03-20 18:15:04,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:04,838 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:04,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:04,889 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:04,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:04,910 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:04,910 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:04,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2131421079] [2022-03-20 18:15:04,911 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2131421079] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:04,911 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:04,911 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:05,034 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:05,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1697503280] [2022-03-20 18:15:05,035 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1697503280] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:05,035 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:05,035 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 18:15:05,035 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281620712] [2022-03-20 18:15:05,035 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:05,036 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 18:15:05,036 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:05,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 18:15:05,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2022-03-20 18:15:05,038 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand has 14 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 13 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:05,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:05,246 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2022-03-20 18:15:05,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 18:15:05,246 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 13 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2022-03-20 18:15:05,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:05,247 INFO L225 Difference]: With dead ends: 36 [2022-03-20 18:15:05,247 INFO L226 Difference]: Without dead ends: 26 [2022-03-20 18:15:05,248 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2022-03-20 18:15:05,248 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 234 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 234 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:05,248 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 72 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 234 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:15:05,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-03-20 18:15:05,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-03-20 18:15:05,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.1) internal successors, (22), 20 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:05,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2022-03-20 18:15:05,253 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 21 [2022-03-20 18:15:05,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:05,253 INFO L478 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2022-03-20 18:15:05,253 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 13 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:05,253 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2022-03-20 18:15:05,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-20 18:15:05,254 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:05,254 INFO L499 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:05,254 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-03-20 18:15:05,254 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:05,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:05,255 INFO L85 PathProgramCache]: Analyzing trace with hash 1513323469, now seen corresponding path program 9 times [2022-03-20 18:15:05,255 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:05,255 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [180295915] [2022-03-20 18:15:05,372 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:05,373 INFO L85 PathProgramCache]: Analyzing trace with hash -1666297458, now seen corresponding path program 1 times [2022-03-20 18:15:05,373 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:05,373 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1930684594] [2022-03-20 18:15:05,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:05,373 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:05,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:05,413 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:05,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:05,418 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:05,418 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:05,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1930684594] [2022-03-20 18:15:05,418 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1930684594] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:05,418 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:05,418 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:05,552 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:05,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [180295915] [2022-03-20 18:15:05,552 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [180295915] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:05,553 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:05,553 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 18:15:05,553 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568650312] [2022-03-20 18:15:05,553 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:05,553 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 18:15:05,553 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:05,554 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 18:15:05,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2022-03-20 18:15:05,554 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 15 states, 15 states have (on average 1.2) internal successors, (18), 14 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:05,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:05,800 INFO L93 Difference]: Finished difference Result 37 states and 39 transitions. [2022-03-20 18:15:05,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 18:15:05,801 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.2) internal successors, (18), 14 states have internal predecessors, (18), 2 states have call successors, (3), 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 22 [2022-03-20 18:15:05,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:05,802 INFO L225 Difference]: With dead ends: 37 [2022-03-20 18:15:05,802 INFO L226 Difference]: Without dead ends: 27 [2022-03-20 18:15:05,802 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2022-03-20 18:15:05,803 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 267 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 267 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:05,803 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 77 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 267 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:15:05,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-03-20 18:15:05,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-03-20 18:15:05,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 21 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:05,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2022-03-20 18:15:05,807 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 22 [2022-03-20 18:15:05,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:05,807 INFO L478 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2022-03-20 18:15:05,807 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.2) internal successors, (18), 14 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:05,807 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2022-03-20 18:15:05,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-20 18:15:05,808 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:05,808 INFO L499 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:05,808 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-03-20 18:15:05,808 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:05,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:05,808 INFO L85 PathProgramCache]: Analyzing trace with hash 1844451111, now seen corresponding path program 10 times [2022-03-20 18:15:05,808 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:05,809 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [243040052] [2022-03-20 18:15:05,974 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:05,974 INFO L85 PathProgramCache]: Analyzing trace with hash -700636722, now seen corresponding path program 1 times [2022-03-20 18:15:05,974 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:05,974 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105401454] [2022-03-20 18:15:05,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:05,975 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:05,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:06,029 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:06,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:06,033 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:06,033 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:06,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105401454] [2022-03-20 18:15:06,034 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [105401454] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:06,034 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:06,034 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:06,203 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:06,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [243040052] [2022-03-20 18:15:06,203 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [243040052] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:06,203 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:06,204 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 18:15:06,204 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374190305] [2022-03-20 18:15:06,204 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:06,204 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 18:15:06,204 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:06,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 18:15:06,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=239, Unknown=0, NotChecked=0, Total=272 [2022-03-20 18:15:06,205 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 16 states, 16 states have (on average 1.1875) internal successors, (19), 15 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:06,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:06,480 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2022-03-20 18:15:06,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 18:15:06,481 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.1875) internal successors, (19), 15 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-03-20 18:15:06,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:06,482 INFO L225 Difference]: With dead ends: 38 [2022-03-20 18:15:06,482 INFO L226 Difference]: Without dead ends: 28 [2022-03-20 18:15:06,482 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2022-03-20 18:15:06,483 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 302 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:06,483 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 82 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 302 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:15:06,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-03-20 18:15:06,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-03-20 18:15:06,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:06,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2022-03-20 18:15:06,487 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 23 [2022-03-20 18:15:06,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:06,488 INFO L478 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2022-03-20 18:15:06,488 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.1875) internal successors, (19), 15 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:06,488 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2022-03-20 18:15:06,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-20 18:15:06,488 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:06,489 INFO L499 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:06,489 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-03-20 18:15:06,489 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:06,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:06,489 INFO L85 PathProgramCache]: Analyzing trace with hash -775493875, now seen corresponding path program 11 times [2022-03-20 18:15:06,490 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:06,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1554702118] [2022-03-20 18:15:06,641 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:06,642 INFO L85 PathProgramCache]: Analyzing trace with hash 265024014, now seen corresponding path program 1 times [2022-03-20 18:15:06,642 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:06,642 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [128546555] [2022-03-20 18:15:06,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:06,642 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:06,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:06,689 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:06,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:06,698 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:06,699 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:06,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [128546555] [2022-03-20 18:15:06,699 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [128546555] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:06,699 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:06,699 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:06,870 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:06,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1554702118] [2022-03-20 18:15:06,870 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1554702118] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:06,870 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:06,871 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-20 18:15:06,871 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471460902] [2022-03-20 18:15:06,871 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:06,871 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-20 18:15:06,871 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:06,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-20 18:15:06,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2022-03-20 18:15:06,872 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand has 17 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 16 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:07,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:07,174 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2022-03-20 18:15:07,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 18:15:07,174 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 16 states have internal predecessors, (20), 2 states have call successors, (3), 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 24 [2022-03-20 18:15:07,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:07,177 INFO L225 Difference]: With dead ends: 39 [2022-03-20 18:15:07,177 INFO L226 Difference]: Without dead ends: 29 [2022-03-20 18:15:07,178 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2022-03-20 18:15:07,179 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 339 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 339 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:07,179 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 87 Invalid, 353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 339 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:15:07,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-20 18:15:07,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-03-20 18:15:07,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:07,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2022-03-20 18:15:07,189 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 24 [2022-03-20 18:15:07,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:07,189 INFO L478 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2022-03-20 18:15:07,190 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 16 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:07,190 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2022-03-20 18:15:07,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-20 18:15:07,190 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:07,190 INFO L499 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:07,191 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-03-20 18:15:07,191 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:07,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:07,191 INFO L85 PathProgramCache]: Analyzing trace with hash -389409817, now seen corresponding path program 12 times [2022-03-20 18:15:07,191 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:07,191 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [289795761] [2022-03-20 18:15:07,343 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:07,344 INFO L85 PathProgramCache]: Analyzing trace with hash 1230684750, now seen corresponding path program 1 times [2022-03-20 18:15:07,344 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:07,344 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [179200193] [2022-03-20 18:15:07,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:07,344 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:07,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:07,390 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:07,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:07,398 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:07,398 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:07,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [179200193] [2022-03-20 18:15:07,398 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [179200193] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:07,399 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:07,399 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:07,585 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:07,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [289795761] [2022-03-20 18:15:07,585 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [289795761] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:07,585 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:07,585 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-20 18:15:07,585 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1596623697] [2022-03-20 18:15:07,585 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:07,586 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-20 18:15:07,586 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:07,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-20 18:15:07,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=305, Unknown=0, NotChecked=0, Total=342 [2022-03-20 18:15:07,586 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand has 18 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 17 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:07,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:07,895 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2022-03-20 18:15:07,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 18:15:07,896 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 17 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2022-03-20 18:15:07,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:07,896 INFO L225 Difference]: With dead ends: 40 [2022-03-20 18:15:07,897 INFO L226 Difference]: Without dead ends: 30 [2022-03-20 18:15:07,897 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2022-03-20 18:15:07,898 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 378 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 393 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 378 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:07,898 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 92 Invalid, 393 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 378 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:15:07,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-03-20 18:15:07,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-03-20 18:15:07,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 24 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:07,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2022-03-20 18:15:07,902 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 25 [2022-03-20 18:15:07,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:07,902 INFO L478 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2022-03-20 18:15:07,902 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 17 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:07,902 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2022-03-20 18:15:07,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-03-20 18:15:07,903 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:07,903 INFO L499 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:07,903 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-03-20 18:15:07,903 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:07,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:07,904 INFO L85 PathProgramCache]: Analyzing trace with hash -1305705907, now seen corresponding path program 13 times [2022-03-20 18:15:07,904 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:07,904 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1112873244] [2022-03-20 18:15:08,062 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:08,062 INFO L85 PathProgramCache]: Analyzing trace with hash -2098621810, now seen corresponding path program 1 times [2022-03-20 18:15:08,062 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:08,063 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [900541605] [2022-03-20 18:15:08,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:08,063 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:08,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:08,102 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:08,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:08,106 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:08,106 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:08,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [900541605] [2022-03-20 18:15:08,106 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [900541605] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:08,106 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:08,107 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:08,334 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:08,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1112873244] [2022-03-20 18:15:08,334 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1112873244] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:08,334 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:08,334 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-20 18:15:08,335 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463366227] [2022-03-20 18:15:08,335 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:08,335 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-20 18:15:08,335 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:08,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-20 18:15:08,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=341, Unknown=0, NotChecked=0, Total=380 [2022-03-20 18:15:08,336 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 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) [2022-03-20 18:15:08,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:08,706 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2022-03-20 18:15:08,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-20 18:15:08,706 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 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 [2022-03-20 18:15:08,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:08,707 INFO L225 Difference]: With dead ends: 41 [2022-03-20 18:15:08,707 INFO L226 Difference]: Without dead ends: 31 [2022-03-20 18:15:08,709 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2022-03-20 18:15:08,709 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 419 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 435 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 419 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:08,710 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 97 Invalid, 435 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 419 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:15:08,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-03-20 18:15:08,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-03-20 18:15:08,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:08,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2022-03-20 18:15:08,719 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 26 [2022-03-20 18:15:08,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:08,719 INFO L478 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2022-03-20 18:15:08,720 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 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) [2022-03-20 18:15:08,720 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2022-03-20 18:15:08,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-20 18:15:08,720 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:08,720 INFO L499 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:08,721 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-03-20 18:15:08,721 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:08,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:08,721 INFO L85 PathProgramCache]: Analyzing trace with hash 353886375, now seen corresponding path program 14 times [2022-03-20 18:15:08,721 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:08,721 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1296755149] [2022-03-20 18:15:08,895 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:08,896 INFO L85 PathProgramCache]: Analyzing trace with hash -1132961074, now seen corresponding path program 1 times [2022-03-20 18:15:08,896 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:08,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1178774751] [2022-03-20 18:15:08,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:08,897 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:08,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:08,930 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:08,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:08,934 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:08,934 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:08,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1178774751] [2022-03-20 18:15:08,934 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1178774751] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:08,934 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:08,934 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:09,135 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:09,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1296755149] [2022-03-20 18:15:09,136 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1296755149] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:09,136 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:09,136 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-20 18:15:09,136 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668458219] [2022-03-20 18:15:09,136 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:09,137 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-20 18:15:09,137 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:09,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-20 18:15:09,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=379, Unknown=0, NotChecked=0, Total=420 [2022-03-20 18:15:09,137 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand has 20 states, 20 states have (on average 1.15) internal successors, (23), 19 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:09,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:09,496 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2022-03-20 18:15:09,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 18:15:09,497 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.15) internal successors, (23), 19 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2022-03-20 18:15:09,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:09,497 INFO L225 Difference]: With dead ends: 42 [2022-03-20 18:15:09,497 INFO L226 Difference]: Without dead ends: 32 [2022-03-20 18:15:09,498 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2022-03-20 18:15:09,500 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:09,500 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 102 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 462 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:15:09,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-03-20 18:15:09,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-03-20 18:15:09,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:09,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2022-03-20 18:15:09,504 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 27 [2022-03-20 18:15:09,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:09,505 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2022-03-20 18:15:09,505 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.15) internal successors, (23), 19 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:09,505 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2022-03-20 18:15:09,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-20 18:15:09,505 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:09,506 INFO L499 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:09,506 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-03-20 18:15:09,506 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:09,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:09,506 INFO L85 PathProgramCache]: Analyzing trace with hash 261639565, now seen corresponding path program 15 times [2022-03-20 18:15:09,506 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:09,506 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [229869986] [2022-03-20 18:15:09,670 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:09,671 INFO L85 PathProgramCache]: Analyzing trace with hash -167300338, now seen corresponding path program 1 times [2022-03-20 18:15:09,671 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:09,671 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [392312420] [2022-03-20 18:15:09,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:09,671 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:09,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:09,706 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:09,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:09,711 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:09,711 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:09,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [392312420] [2022-03-20 18:15:09,711 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [392312420] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:09,711 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:09,711 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:09,938 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:09,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [229869986] [2022-03-20 18:15:09,938 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [229869986] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:09,938 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:09,938 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-20 18:15:09,938 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001310334] [2022-03-20 18:15:09,938 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:09,939 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-20 18:15:09,939 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:09,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-20 18:15:09,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=419, Unknown=0, NotChecked=0, Total=462 [2022-03-20 18:15:09,940 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 21 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 20 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:10,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:10,358 INFO L93 Difference]: Finished difference Result 43 states and 45 transitions. [2022-03-20 18:15:10,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-20 18:15:10,358 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 20 states have internal predecessors, (24), 2 states have call successors, (3), 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 28 [2022-03-20 18:15:10,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:10,359 INFO L225 Difference]: With dead ends: 43 [2022-03-20 18:15:10,359 INFO L226 Difference]: Without dead ends: 33 [2022-03-20 18:15:10,359 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2022-03-20 18:15:10,360 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 507 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 525 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 507 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:10,360 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 107 Invalid, 525 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 507 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:15:10,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-03-20 18:15:10,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-03-20 18:15:10,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 27 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:10,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2022-03-20 18:15:10,364 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 28 [2022-03-20 18:15:10,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:10,365 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2022-03-20 18:15:10,365 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 20 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:10,365 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2022-03-20 18:15:10,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-20 18:15:10,366 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:10,366 INFO L499 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:10,366 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-03-20 18:15:10,366 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:10,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:10,367 INFO L85 PathProgramCache]: Analyzing trace with hash 1696955751, now seen corresponding path program 16 times [2022-03-20 18:15:10,367 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:10,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1754032757] [2022-03-20 18:15:10,488 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:10,489 INFO L85 PathProgramCache]: Analyzing trace with hash 798360398, now seen corresponding path program 1 times [2022-03-20 18:15:10,489 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:10,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1801871483] [2022-03-20 18:15:10,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:10,490 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:10,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:10,528 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:10,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:10,533 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:10,534 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:10,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1801871483] [2022-03-20 18:15:10,534 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1801871483] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:10,534 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:10,534 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:10,811 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:10,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1754032757] [2022-03-20 18:15:10,811 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1754032757] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:10,811 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:10,811 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-03-20 18:15:10,811 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686342094] [2022-03-20 18:15:10,812 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:10,812 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-20 18:15:10,812 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:10,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-20 18:15:10,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=461, Unknown=0, NotChecked=0, Total=506 [2022-03-20 18:15:10,813 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand has 22 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 21 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:11,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:11,277 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2022-03-20 18:15:11,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-20 18:15:11,277 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 21 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2022-03-20 18:15:11,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:11,278 INFO L225 Difference]: With dead ends: 44 [2022-03-20 18:15:11,278 INFO L226 Difference]: Without dead ends: 34 [2022-03-20 18:15:11,279 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2022-03-20 18:15:11,279 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 554 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 573 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 554 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:11,279 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 112 Invalid, 573 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 554 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:15:11,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-03-20 18:15:11,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2022-03-20 18:15:11,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 28 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:11,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2022-03-20 18:15:11,283 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 29 [2022-03-20 18:15:11,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:11,283 INFO L478 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2022-03-20 18:15:11,283 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 21 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:11,284 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2022-03-20 18:15:11,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-03-20 18:15:11,284 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:11,284 INFO L499 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:11,284 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-03-20 18:15:11,284 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:11,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:11,285 INFO L85 PathProgramCache]: Analyzing trace with hash -1052882739, now seen corresponding path program 17 times [2022-03-20 18:15:11,285 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:11,285 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2123466160] [2022-03-20 18:15:11,436 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:11,437 INFO L85 PathProgramCache]: Analyzing trace with hash 1764021134, now seen corresponding path program 1 times [2022-03-20 18:15:11,437 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:11,437 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1946528959] [2022-03-20 18:15:11,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:11,437 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:11,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:11,477 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:11,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:11,483 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:11,484 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:11,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1946528959] [2022-03-20 18:15:11,484 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1946528959] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:11,484 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:11,484 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:11,739 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:11,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2123466160] [2022-03-20 18:15:11,739 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2123466160] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:11,740 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:11,740 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-20 18:15:11,740 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951210665] [2022-03-20 18:15:11,740 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:11,740 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-20 18:15:11,740 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:11,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-20 18:15:11,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=505, Unknown=0, NotChecked=0, Total=552 [2022-03-20 18:15:11,741 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand has 23 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 22 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:12,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:12,226 INFO L93 Difference]: Finished difference Result 45 states and 47 transitions. [2022-03-20 18:15:12,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-03-20 18:15:12,227 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 22 states have internal predecessors, (26), 2 states have call successors, (3), 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 30 [2022-03-20 18:15:12,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:12,227 INFO L225 Difference]: With dead ends: 45 [2022-03-20 18:15:12,227 INFO L226 Difference]: Without dead ends: 35 [2022-03-20 18:15:12,228 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2022-03-20 18:15:12,228 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 603 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 623 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 603 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:12,229 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 117 Invalid, 623 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 603 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:15:12,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-20 18:15:12,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-03-20 18:15:12,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 29 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:12,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2022-03-20 18:15:12,232 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 30 [2022-03-20 18:15:12,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:12,232 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2022-03-20 18:15:12,233 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 22 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:12,233 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2022-03-20 18:15:12,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-20 18:15:12,233 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:12,233 INFO L499 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:12,233 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2022-03-20 18:15:12,233 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:12,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:12,234 INFO L85 PathProgramCache]: Analyzing trace with hash -398530009, now seen corresponding path program 18 times [2022-03-20 18:15:12,234 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:12,234 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [488316002] [2022-03-20 18:15:12,380 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:12,381 INFO L85 PathProgramCache]: Analyzing trace with hash -1565285426, now seen corresponding path program 1 times [2022-03-20 18:15:12,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:12,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [693402614] [2022-03-20 18:15:12,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:12,381 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:12,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:12,415 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:12,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:12,418 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:12,418 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:12,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [693402614] [2022-03-20 18:15:12,418 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [693402614] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:12,419 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:12,419 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:12,678 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:12,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [488316002] [2022-03-20 18:15:12,678 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [488316002] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:12,678 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:12,678 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-03-20 18:15:12,679 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537497350] [2022-03-20 18:15:12,679 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:12,679 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-03-20 18:15:12,679 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:12,679 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-03-20 18:15:12,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=551, Unknown=0, NotChecked=0, Total=600 [2022-03-20 18:15:12,680 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand has 24 states, 24 states have (on average 1.125) internal successors, (27), 23 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:13,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:13,240 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2022-03-20 18:15:13,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-20 18:15:13,241 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.125) internal successors, (27), 23 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2022-03-20 18:15:13,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:13,241 INFO L225 Difference]: With dead ends: 46 [2022-03-20 18:15:13,242 INFO L226 Difference]: Without dead ends: 36 [2022-03-20 18:15:13,242 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2022-03-20 18:15:13,243 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 654 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 675 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 654 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:13,243 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 122 Invalid, 675 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 654 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:15:13,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-03-20 18:15:13,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2022-03-20 18:15:13,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:13,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2022-03-20 18:15:13,247 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 31 [2022-03-20 18:15:13,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:13,247 INFO L478 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2022-03-20 18:15:13,247 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.125) internal successors, (27), 23 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:13,247 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2022-03-20 18:15:13,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-20 18:15:13,247 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:13,251 INFO L499 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:13,251 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2022-03-20 18:15:13,251 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:13,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:13,251 INFO L85 PathProgramCache]: Analyzing trace with hash -1588431859, now seen corresponding path program 19 times [2022-03-20 18:15:13,251 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:13,252 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1799593169] [2022-03-20 18:15:13,387 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:13,388 INFO L85 PathProgramCache]: Analyzing trace with hash -599624690, now seen corresponding path program 1 times [2022-03-20 18:15:13,388 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:13,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [509665983] [2022-03-20 18:15:13,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:13,388 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:13,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:13,418 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:13,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:13,423 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:13,423 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:13,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [509665983] [2022-03-20 18:15:13,423 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [509665983] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:13,423 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:13,424 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:13,726 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:13,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1799593169] [2022-03-20 18:15:13,726 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1799593169] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:13,726 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:13,726 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-03-20 18:15:13,727 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057528736] [2022-03-20 18:15:13,727 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:13,727 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-03-20 18:15:13,727 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:13,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-03-20 18:15:13,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=599, Unknown=0, NotChecked=0, Total=650 [2022-03-20 18:15:13,728 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 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) [2022-03-20 18:15:14,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:14,345 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2022-03-20 18:15:14,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-20 18:15:14,346 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 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 [2022-03-20 18:15:14,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:14,347 INFO L225 Difference]: With dead ends: 47 [2022-03-20 18:15:14,347 INFO L226 Difference]: Without dead ends: 37 [2022-03-20 18:15:14,348 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2022-03-20 18:15:14,348 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 707 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 729 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 707 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:14,348 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 127 Invalid, 729 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 707 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:15:14,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-03-20 18:15:14,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2022-03-20 18:15:14,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:14,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2022-03-20 18:15:14,352 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 32 [2022-03-20 18:15:14,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:14,352 INFO L478 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2022-03-20 18:15:14,353 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 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) [2022-03-20 18:15:14,353 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2022-03-20 18:15:14,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-20 18:15:14,353 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:14,353 INFO L499 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:14,353 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2022-03-20 18:15:14,353 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:14,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:14,354 INFO L85 PathProgramCache]: Analyzing trace with hash 179316455, now seen corresponding path program 20 times [2022-03-20 18:15:14,354 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:14,354 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1248470242] [2022-03-20 18:15:14,501 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:14,502 INFO L85 PathProgramCache]: Analyzing trace with hash 366036046, now seen corresponding path program 1 times [2022-03-20 18:15:14,502 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:14,502 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1187902312] [2022-03-20 18:15:14,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:14,502 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:14,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:14,547 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:14,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:14,551 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:14,552 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:14,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1187902312] [2022-03-20 18:15:14,552 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1187902312] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:14,552 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:14,552 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:14,871 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:14,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1248470242] [2022-03-20 18:15:14,872 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1248470242] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:14,872 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:14,872 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-03-20 18:15:14,872 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311205271] [2022-03-20 18:15:14,872 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:14,872 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-20 18:15:14,872 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:14,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-20 18:15:14,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=649, Unknown=0, NotChecked=0, Total=702 [2022-03-20 18:15:14,873 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand has 26 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 25 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:15,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:15,522 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2022-03-20 18:15:15,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-03-20 18:15:15,522 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 25 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2022-03-20 18:15:15,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:15,523 INFO L225 Difference]: With dead ends: 48 [2022-03-20 18:15:15,523 INFO L226 Difference]: Without dead ends: 38 [2022-03-20 18:15:15,524 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 275 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2022-03-20 18:15:15,525 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 762 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 785 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 762 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:15,525 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 132 Invalid, 785 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 762 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:15:15,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-03-20 18:15:15,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-03-20 18:15:15,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 32 states have (on average 1.0625) internal successors, (34), 32 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:15,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2022-03-20 18:15:15,532 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 33 [2022-03-20 18:15:15,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:15,532 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2022-03-20 18:15:15,532 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 25 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:15,532 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2022-03-20 18:15:15,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-20 18:15:15,533 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:15,534 INFO L499 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:15,534 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2022-03-20 18:15:15,534 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:15,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:15,534 INFO L85 PathProgramCache]: Analyzing trace with hash -855060659, now seen corresponding path program 21 times [2022-03-20 18:15:15,534 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:15,534 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2001247502] [2022-03-20 18:15:15,669 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:15,670 INFO L85 PathProgramCache]: Analyzing trace with hash 1331696782, now seen corresponding path program 1 times [2022-03-20 18:15:15,670 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:15,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1620751981] [2022-03-20 18:15:15,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:15,670 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:15,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:15,704 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:15,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:15,708 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:15,708 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:15,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1620751981] [2022-03-20 18:15:15,708 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1620751981] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:15,708 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:15,709 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:16,047 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:16,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2001247502] [2022-03-20 18:15:16,048 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2001247502] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:16,048 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:16,048 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-03-20 18:15:16,048 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969984777] [2022-03-20 18:15:16,048 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:16,048 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-03-20 18:15:16,048 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:16,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-03-20 18:15:16,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=701, Unknown=0, NotChecked=0, Total=756 [2022-03-20 18:15:16,049 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand has 27 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 26 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:16,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:16,718 INFO L93 Difference]: Finished difference Result 49 states and 51 transitions. [2022-03-20 18:15:16,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-03-20 18:15:16,720 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 26 states have internal predecessors, (30), 2 states have call successors, (3), 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 34 [2022-03-20 18:15:16,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:16,721 INFO L225 Difference]: With dead ends: 49 [2022-03-20 18:15:16,721 INFO L226 Difference]: Without dead ends: 39 [2022-03-20 18:15:16,722 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2022-03-20 18:15:16,722 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 819 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 843 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 819 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:16,723 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 137 Invalid, 843 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 819 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:15:16,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-03-20 18:15:16,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2022-03-20 18:15:16,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 33 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:16,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2022-03-20 18:15:16,727 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 34 [2022-03-20 18:15:16,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:16,727 INFO L478 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2022-03-20 18:15:16,727 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 26 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:16,727 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2022-03-20 18:15:16,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-20 18:15:16,727 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:16,728 INFO L499 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:16,728 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2022-03-20 18:15:16,728 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:16,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:16,728 INFO L85 PathProgramCache]: Analyzing trace with hash 1438987175, now seen corresponding path program 22 times [2022-03-20 18:15:16,728 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:16,729 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2062818182] [2022-03-20 18:15:16,860 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:16,860 INFO L85 PathProgramCache]: Analyzing trace with hash -1997609778, now seen corresponding path program 1 times [2022-03-20 18:15:16,861 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:16,861 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1819792849] [2022-03-20 18:15:16,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:16,861 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:16,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:16,910 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:16,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:16,914 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:16,914 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:16,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1819792849] [2022-03-20 18:15:16,914 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1819792849] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:16,914 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:16,914 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:17,263 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:17,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2062818182] [2022-03-20 18:15:17,264 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2062818182] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:17,264 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:17,264 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-03-20 18:15:17,264 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1577385374] [2022-03-20 18:15:17,264 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:17,264 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-03-20 18:15:17,264 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:17,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-03-20 18:15:17,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=755, Unknown=0, NotChecked=0, Total=812 [2022-03-20 18:15:17,265 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 28 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 27 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:17,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:17,890 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2022-03-20 18:15:17,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-03-20 18:15:17,890 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 27 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2022-03-20 18:15:17,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:17,891 INFO L225 Difference]: With dead ends: 50 [2022-03-20 18:15:17,891 INFO L226 Difference]: Without dead ends: 40 [2022-03-20 18:15:17,892 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 324 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=150, Invalid=2502, Unknown=0, NotChecked=0, Total=2652 [2022-03-20 18:15:17,893 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 878 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 142 SdHoareTripleChecker+Invalid, 903 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 878 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:17,893 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 142 Invalid, 903 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 878 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:15:17,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-03-20 18:15:17,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2022-03-20 18:15:17,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:17,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2022-03-20 18:15:17,897 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 35 [2022-03-20 18:15:17,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:17,897 INFO L478 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2022-03-20 18:15:17,897 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 27 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:17,897 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2022-03-20 18:15:17,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-20 18:15:17,897 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:17,898 INFO L499 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:17,898 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2022-03-20 18:15:17,898 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:17,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:17,898 INFO L85 PathProgramCache]: Analyzing trace with hash -459974003, now seen corresponding path program 23 times [2022-03-20 18:15:17,898 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:17,898 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1695970934] [2022-03-20 18:15:18,030 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:18,030 INFO L85 PathProgramCache]: Analyzing trace with hash -1031949042, now seen corresponding path program 1 times [2022-03-20 18:15:18,030 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:18,031 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1584428070] [2022-03-20 18:15:18,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:18,031 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:18,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:18,061 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:18,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:18,067 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:18,068 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:18,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1584428070] [2022-03-20 18:15:18,068 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1584428070] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:18,068 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:18,068 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:18,470 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:18,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1695970934] [2022-03-20 18:15:18,470 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1695970934] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:18,470 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:18,470 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-03-20 18:15:18,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469570566] [2022-03-20 18:15:18,470 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:18,470 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-03-20 18:15:18,470 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:18,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-03-20 18:15:18,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=811, Unknown=0, NotChecked=0, Total=870 [2022-03-20 18:15:18,471 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand has 29 states, 29 states have (on average 1.103448275862069) internal successors, (32), 28 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:19,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:19,167 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2022-03-20 18:15:19,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-03-20 18:15:19,168 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.103448275862069) internal successors, (32), 28 states have internal predecessors, (32), 2 states have call successors, (3), 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 36 [2022-03-20 18:15:19,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:19,168 INFO L225 Difference]: With dead ends: 51 [2022-03-20 18:15:19,168 INFO L226 Difference]: Without dead ends: 41 [2022-03-20 18:15:19,169 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=156, Invalid=2706, Unknown=0, NotChecked=0, Total=2862 [2022-03-20 18:15:19,170 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 939 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 965 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 939 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:19,170 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 147 Invalid, 965 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 939 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:15:19,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-03-20 18:15:19,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-03-20 18:15:19,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 35 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:19,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2022-03-20 18:15:19,173 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 36 [2022-03-20 18:15:19,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:19,173 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2022-03-20 18:15:19,174 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.103448275862069) internal successors, (32), 28 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:19,174 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2022-03-20 18:15:19,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-20 18:15:19,174 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:19,174 INFO L499 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:19,174 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2022-03-20 18:15:19,174 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:19,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:19,174 INFO L85 PathProgramCache]: Analyzing trace with hash 801771623, now seen corresponding path program 24 times [2022-03-20 18:15:19,175 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:19,175 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [951882748] [2022-03-20 18:15:19,303 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:19,303 INFO L85 PathProgramCache]: Analyzing trace with hash -66288306, now seen corresponding path program 1 times [2022-03-20 18:15:19,304 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:19,304 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1349291683] [2022-03-20 18:15:19,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:19,304 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:19,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:19,335 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:19,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:19,340 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:19,340 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:19,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1349291683] [2022-03-20 18:15:19,341 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1349291683] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:19,341 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:19,341 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:19,798 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:19,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [951882748] [2022-03-20 18:15:19,798 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [951882748] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:19,798 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:19,799 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-03-20 18:15:19,799 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1652115382] [2022-03-20 18:15:19,799 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:19,800 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-03-20 18:15:19,800 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:19,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-03-20 18:15:19,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=869, Unknown=0, NotChecked=0, Total=930 [2022-03-20 18:15:19,801 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand has 30 states, 30 states have (on average 1.1) internal successors, (33), 29 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:20,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:20,631 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2022-03-20 18:15:20,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-03-20 18:15:20,632 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.1) internal successors, (33), 29 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2022-03-20 18:15:20,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:20,632 INFO L225 Difference]: With dead ends: 52 [2022-03-20 18:15:20,632 INFO L226 Difference]: Without dead ends: 42 [2022-03-20 18:15:20,634 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 377 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=162, Invalid=2918, Unknown=0, NotChecked=0, Total=3080 [2022-03-20 18:15:20,634 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 1002 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 1029 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 1002 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:20,634 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 152 Invalid, 1029 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 1002 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-20 18:15:20,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-03-20 18:15:20,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2022-03-20 18:15:20,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 36 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:20,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2022-03-20 18:15:20,638 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 37 [2022-03-20 18:15:20,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:20,638 INFO L478 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2022-03-20 18:15:20,639 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.1) internal successors, (33), 29 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:20,639 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2022-03-20 18:15:20,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-20 18:15:20,639 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:20,639 INFO L499 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:20,639 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2022-03-20 18:15:20,639 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:20,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:20,640 INFO L85 PathProgramCache]: Analyzing trace with hash 1261180365, now seen corresponding path program 25 times [2022-03-20 18:15:20,640 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:20,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [976249652] [2022-03-20 18:15:20,743 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:20,743 INFO L85 PathProgramCache]: Analyzing trace with hash 899372430, now seen corresponding path program 1 times [2022-03-20 18:15:20,744 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:20,744 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1508519024] [2022-03-20 18:15:20,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:20,744 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:20,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:20,778 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:20,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:20,781 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:20,781 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:20,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1508519024] [2022-03-20 18:15:20,782 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1508519024] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:20,782 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:20,782 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:21,196 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:21,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [976249652] [2022-03-20 18:15:21,197 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [976249652] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:21,197 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:21,197 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-03-20 18:15:21,197 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273771786] [2022-03-20 18:15:21,197 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:21,197 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-03-20 18:15:21,197 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:21,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-03-20 18:15:21,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=929, Unknown=0, NotChecked=0, Total=992 [2022-03-20 18:15:21,198 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand has 31 states, 31 states have (on average 1.096774193548387) internal successors, (34), 30 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) [2022-03-20 18:15:21,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:21,993 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2022-03-20 18:15:21,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-03-20 18:15:21,994 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.096774193548387) internal successors, (34), 30 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 [2022-03-20 18:15:21,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:21,994 INFO L225 Difference]: With dead ends: 53 [2022-03-20 18:15:21,995 INFO L226 Difference]: Without dead ends: 43 [2022-03-20 18:15:21,996 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 405 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=168, Invalid=3138, Unknown=0, NotChecked=0, Total=3306 [2022-03-20 18:15:21,996 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 1067 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 1095 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 1067 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:21,996 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 157 Invalid, 1095 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 1067 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-20 18:15:21,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-03-20 18:15:21,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2022-03-20 18:15:22,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 37 states have (on average 1.054054054054054) internal successors, (39), 37 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:22,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2022-03-20 18:15:22,000 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 38 [2022-03-20 18:15:22,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:22,000 INFO L478 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2022-03-20 18:15:22,000 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.096774193548387) internal successors, (34), 30 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) [2022-03-20 18:15:22,001 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2022-03-20 18:15:22,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-20 18:15:22,001 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:22,001 INFO L499 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:22,001 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2022-03-20 18:15:22,001 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:22,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:22,002 INFO L85 PathProgramCache]: Analyzing trace with hash -1677017817, now seen corresponding path program 26 times [2022-03-20 18:15:22,002 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:22,002 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1915737112] [2022-03-20 18:15:22,132 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:22,132 INFO L85 PathProgramCache]: Analyzing trace with hash 1865033166, now seen corresponding path program 1 times [2022-03-20 18:15:22,133 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:22,133 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [839152659] [2022-03-20 18:15:22,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:22,133 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:22,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:22,165 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:22,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:22,177 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:22,177 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:22,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [839152659] [2022-03-20 18:15:22,177 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [839152659] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:22,177 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:22,177 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:22,656 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:22,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1915737112] [2022-03-20 18:15:22,657 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1915737112] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:22,657 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:22,657 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-03-20 18:15:22,657 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411239490] [2022-03-20 18:15:22,657 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:22,657 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-03-20 18:15:22,657 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:22,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-03-20 18:15:22,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=991, Unknown=0, NotChecked=0, Total=1056 [2022-03-20 18:15:22,658 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand has 32 states, 32 states have (on average 1.09375) internal successors, (35), 31 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:23,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:23,565 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2022-03-20 18:15:23,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-03-20 18:15:23,566 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.09375) internal successors, (35), 31 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2022-03-20 18:15:23,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:23,567 INFO L225 Difference]: With dead ends: 54 [2022-03-20 18:15:23,567 INFO L226 Difference]: Without dead ends: 44 [2022-03-20 18:15:23,568 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 434 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=174, Invalid=3366, Unknown=0, NotChecked=0, Total=3540 [2022-03-20 18:15:23,568 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 1134 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 1163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 1134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:23,569 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 162 Invalid, 1163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 1134 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 18:15:23,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-03-20 18:15:23,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2022-03-20 18:15:23,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:23,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions. [2022-03-20 18:15:23,572 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 39 [2022-03-20 18:15:23,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:23,573 INFO L478 AbstractCegarLoop]: Abstraction has 44 states and 45 transitions. [2022-03-20 18:15:23,573 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.09375) internal successors, (35), 31 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:23,573 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions. [2022-03-20 18:15:23,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-03-20 18:15:23,573 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:23,573 INFO L499 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:23,573 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2022-03-20 18:15:23,574 INFO L403 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:23,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:23,574 INFO L85 PathProgramCache]: Analyzing trace with hash 1728119053, now seen corresponding path program 27 times [2022-03-20 18:15:23,574 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:23,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1274472101] [2022-03-20 18:15:23,733 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:23,733 INFO L85 PathProgramCache]: Analyzing trace with hash -1464273394, now seen corresponding path program 1 times [2022-03-20 18:15:23,734 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:23,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119363022] [2022-03-20 18:15:23,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:23,734 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:23,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:23,768 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:23,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:23,771 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:23,772 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:23,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119363022] [2022-03-20 18:15:23,772 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2119363022] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:23,772 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:23,772 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:24,245 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:24,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1274472101] [2022-03-20 18:15:24,245 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1274472101] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:24,245 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:24,245 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-03-20 18:15:24,245 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163435965] [2022-03-20 18:15:24,245 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:24,246 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-03-20 18:15:24,246 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:24,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-03-20 18:15:24,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1055, Unknown=0, NotChecked=0, Total=1122 [2022-03-20 18:15:24,247 INFO L87 Difference]: Start difference. First operand 44 states and 45 transitions. Second operand has 33 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 32 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:25,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:25,172 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2022-03-20 18:15:25,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-03-20 18:15:25,173 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 32 states have internal predecessors, (36), 2 states have call successors, (3), 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 40 [2022-03-20 18:15:25,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:25,186 INFO L225 Difference]: With dead ends: 55 [2022-03-20 18:15:25,186 INFO L226 Difference]: Without dead ends: 45 [2022-03-20 18:15:25,187 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=180, Invalid=3602, Unknown=0, NotChecked=0, Total=3782 [2022-03-20 18:15:25,188 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 1203 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 1233 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 1203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:25,188 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 167 Invalid, 1233 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 1203 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 18:15:25,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-03-20 18:15:25,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2022-03-20 18:15:25,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 39 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:25,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2022-03-20 18:15:25,191 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 40 [2022-03-20 18:15:25,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:25,192 INFO L478 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2022-03-20 18:15:25,192 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 32 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:25,192 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2022-03-20 18:15:25,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-20 18:15:25,192 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:25,192 INFO L499 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:25,192 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2022-03-20 18:15:25,193 INFO L403 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:25,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:25,193 INFO L85 PathProgramCache]: Analyzing trace with hash -86820377, now seen corresponding path program 28 times [2022-03-20 18:15:25,193 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:25,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1417310404] [2022-03-20 18:15:25,289 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:25,289 INFO L85 PathProgramCache]: Analyzing trace with hash -498612658, now seen corresponding path program 1 times [2022-03-20 18:15:25,290 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:25,290 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1448177973] [2022-03-20 18:15:25,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:25,290 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:25,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:25,330 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:25,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:25,333 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:25,334 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:25,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1448177973] [2022-03-20 18:15:25,334 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1448177973] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:25,334 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:25,334 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:25,847 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:25,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1417310404] [2022-03-20 18:15:25,847 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1417310404] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:25,847 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:25,847 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-03-20 18:15:25,847 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [25456435] [2022-03-20 18:15:25,847 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:25,847 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-03-20 18:15:25,847 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:25,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-03-20 18:15:25,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=1121, Unknown=0, NotChecked=0, Total=1190 [2022-03-20 18:15:25,848 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand has 34 states, 34 states have (on average 1.088235294117647) internal successors, (37), 33 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:26,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:26,844 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2022-03-20 18:15:26,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-03-20 18:15:26,844 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.088235294117647) internal successors, (37), 33 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2022-03-20 18:15:26,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:26,845 INFO L225 Difference]: With dead ends: 56 [2022-03-20 18:15:26,845 INFO L226 Difference]: Without dead ends: 46 [2022-03-20 18:15:26,846 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 495 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=186, Invalid=3846, Unknown=0, NotChecked=0, Total=4032 [2022-03-20 18:15:26,846 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 1274 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 1305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 1274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:26,847 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 172 Invalid, 1305 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 1274 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 18:15:26,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-03-20 18:15:26,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2022-03-20 18:15:26,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 40 states have (on average 1.05) internal successors, (42), 40 states have internal predecessors, (42), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:26,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2022-03-20 18:15:26,850 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 41 [2022-03-20 18:15:26,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:26,851 INFO L478 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2022-03-20 18:15:26,851 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.088235294117647) internal successors, (37), 33 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:26,851 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2022-03-20 18:15:26,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-20 18:15:26,852 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:26,852 INFO L499 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:26,852 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2022-03-20 18:15:26,852 INFO L403 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:26,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:26,852 INFO L85 PathProgramCache]: Analyzing trace with hash -515367859, now seen corresponding path program 29 times [2022-03-20 18:15:26,852 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:26,853 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [499844754] [2022-03-20 18:15:26,989 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:26,989 INFO L85 PathProgramCache]: Analyzing trace with hash 467048078, now seen corresponding path program 1 times [2022-03-20 18:15:26,989 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:26,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [68151746] [2022-03-20 18:15:26,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:26,989 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:26,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:27,023 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:27,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:27,033 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:27,033 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:27,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [68151746] [2022-03-20 18:15:27,033 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [68151746] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:27,033 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:27,033 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:27,693 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:27,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [499844754] [2022-03-20 18:15:27,693 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [499844754] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:27,693 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:27,694 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-03-20 18:15:27,694 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775615263] [2022-03-20 18:15:27,694 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:27,694 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-03-20 18:15:27,694 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:27,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-03-20 18:15:27,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1189, Unknown=0, NotChecked=0, Total=1260 [2022-03-20 18:15:27,695 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand has 35 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 34 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:28,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:28,761 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2022-03-20 18:15:28,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-03-20 18:15:28,762 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 34 states have internal predecessors, (38), 2 states have call successors, (3), 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 42 [2022-03-20 18:15:28,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:28,762 INFO L225 Difference]: With dead ends: 57 [2022-03-20 18:15:28,762 INFO L226 Difference]: Without dead ends: 47 [2022-03-20 18:15:28,763 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 527 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=192, Invalid=4098, Unknown=0, NotChecked=0, Total=4290 [2022-03-20 18:15:28,764 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 1347 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 1379 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 1347 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:28,764 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 177 Invalid, 1379 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 1347 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 18:15:28,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-03-20 18:15:28,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-03-20 18:15:28,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 41 states have (on average 1.048780487804878) internal successors, (43), 41 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:28,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2022-03-20 18:15:28,768 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 42 [2022-03-20 18:15:28,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:28,769 INFO L478 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2022-03-20 18:15:28,769 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 34 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:28,769 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2022-03-20 18:15:28,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-03-20 18:15:28,769 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:28,769 INFO L499 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:28,769 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2022-03-20 18:15:28,770 INFO L403 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:28,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:28,770 INFO L85 PathProgramCache]: Analyzing trace with hash -915437913, now seen corresponding path program 30 times [2022-03-20 18:15:28,770 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:28,770 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1828187751] [2022-03-20 18:15:28,865 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:28,866 INFO L85 PathProgramCache]: Analyzing trace with hash 1432708814, now seen corresponding path program 1 times [2022-03-20 18:15:28,866 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:28,866 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1884496053] [2022-03-20 18:15:28,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:28,866 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:28,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:28,905 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:28,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:28,909 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:28,909 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:28,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1884496053] [2022-03-20 18:15:28,909 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1884496053] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:28,909 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:28,909 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:29,544 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:29,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1828187751] [2022-03-20 18:15:29,544 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1828187751] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:29,544 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:29,544 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-03-20 18:15:29,544 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699160206] [2022-03-20 18:15:29,544 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:29,545 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-03-20 18:15:29,545 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:29,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-03-20 18:15:29,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=1259, Unknown=0, NotChecked=0, Total=1332 [2022-03-20 18:15:29,546 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand has 36 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 35 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:30,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:30,619 INFO L93 Difference]: Finished difference Result 58 states and 60 transitions. [2022-03-20 18:15:30,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-03-20 18:15:30,620 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 35 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2022-03-20 18:15:30,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:30,621 INFO L225 Difference]: With dead ends: 58 [2022-03-20 18:15:30,621 INFO L226 Difference]: Without dead ends: 48 [2022-03-20 18:15:30,621 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 560 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=198, Invalid=4358, Unknown=0, NotChecked=0, Total=4556 [2022-03-20 18:15:30,622 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 1422 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 182 SdHoareTripleChecker+Invalid, 1455 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 1422 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:30,622 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 182 Invalid, 1455 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 1422 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 18:15:30,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-03-20 18:15:30,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2022-03-20 18:15:30,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:30,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2022-03-20 18:15:30,626 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 43 [2022-03-20 18:15:30,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:30,626 INFO L478 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2022-03-20 18:15:30,626 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 35 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:30,626 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2022-03-20 18:15:30,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-20 18:15:30,626 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:30,626 INFO L499 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:30,627 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2022-03-20 18:15:30,627 INFO L403 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:30,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:30,627 INFO L85 PathProgramCache]: Analyzing trace with hash -432707699, now seen corresponding path program 31 times [2022-03-20 18:15:30,627 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:30,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [738805244] [2022-03-20 18:15:30,757 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:30,757 INFO L85 PathProgramCache]: Analyzing trace with hash -1896597746, now seen corresponding path program 1 times [2022-03-20 18:15:30,757 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:30,757 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1053687573] [2022-03-20 18:15:30,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:30,757 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:30,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:30,797 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:30,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:30,803 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:30,803 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:30,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1053687573] [2022-03-20 18:15:30,804 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1053687573] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:30,804 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:30,804 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:31,446 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:31,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [738805244] [2022-03-20 18:15:31,446 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [738805244] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:31,446 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:31,446 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-03-20 18:15:31,446 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1310923270] [2022-03-20 18:15:31,446 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:31,447 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-03-20 18:15:31,447 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:31,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-03-20 18:15:31,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1331, Unknown=0, NotChecked=0, Total=1406 [2022-03-20 18:15:31,452 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand has 37 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 36 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) [2022-03-20 18:15:32,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:32,605 INFO L93 Difference]: Finished difference Result 59 states and 61 transitions. [2022-03-20 18:15:32,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-03-20 18:15:32,606 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 36 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 [2022-03-20 18:15:32,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:32,607 INFO L225 Difference]: With dead ends: 59 [2022-03-20 18:15:32,607 INFO L226 Difference]: Without dead ends: 49 [2022-03-20 18:15:32,608 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 594 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=204, Invalid=4626, Unknown=0, NotChecked=0, Total=4830 [2022-03-20 18:15:32,608 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 1499 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 187 SdHoareTripleChecker+Invalid, 1533 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 1499 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:32,608 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 187 Invalid, 1533 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 1499 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-20 18:15:32,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-03-20 18:15:32,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2022-03-20 18:15:32,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 43 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:32,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2022-03-20 18:15:32,611 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 44 [2022-03-20 18:15:32,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:32,612 INFO L478 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2022-03-20 18:15:32,612 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 36 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) [2022-03-20 18:15:32,612 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2022-03-20 18:15:32,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-03-20 18:15:32,612 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:32,612 INFO L499 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:32,612 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2022-03-20 18:15:32,612 INFO L403 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:32,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:32,613 INFO L85 PathProgramCache]: Analyzing trace with hash 1647027047, now seen corresponding path program 32 times [2022-03-20 18:15:32,613 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:32,613 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [107258889] [2022-03-20 18:15:32,753 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:32,753 INFO L85 PathProgramCache]: Analyzing trace with hash -930937010, now seen corresponding path program 1 times [2022-03-20 18:15:32,754 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:32,754 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1599665223] [2022-03-20 18:15:32,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:32,754 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:32,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:32,784 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:32,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:32,787 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:32,787 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:32,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1599665223] [2022-03-20 18:15:32,787 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1599665223] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:32,787 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:32,787 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:33,452 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:33,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [107258889] [2022-03-20 18:15:33,452 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [107258889] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:33,452 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:33,452 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-03-20 18:15:33,452 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1280345788] [2022-03-20 18:15:33,452 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:33,452 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-03-20 18:15:33,452 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:33,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-03-20 18:15:33,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1405, Unknown=0, NotChecked=0, Total=1482 [2022-03-20 18:15:33,453 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand has 38 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 37 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:34,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:34,715 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2022-03-20 18:15:34,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-03-20 18:15:34,716 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 37 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2022-03-20 18:15:34,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:34,716 INFO L225 Difference]: With dead ends: 60 [2022-03-20 18:15:34,716 INFO L226 Difference]: Without dead ends: 50 [2022-03-20 18:15:34,717 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 629 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=210, Invalid=4902, Unknown=0, NotChecked=0, Total=5112 [2022-03-20 18:15:34,717 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 1578 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 1613 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 1578 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:34,717 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 192 Invalid, 1613 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 1578 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-20 18:15:34,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-03-20 18:15:34,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-03-20 18:15:34,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 44 states have (on average 1.0454545454545454) internal successors, (46), 44 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:34,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2022-03-20 18:15:34,720 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 45 [2022-03-20 18:15:34,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:34,720 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2022-03-20 18:15:34,721 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 37 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:34,721 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2022-03-20 18:15:34,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-20 18:15:34,721 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:34,721 INFO L499 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:34,721 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2022-03-20 18:15:34,721 INFO L403 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:34,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:34,721 INFO L85 PathProgramCache]: Analyzing trace with hash 1694294733, now seen corresponding path program 33 times [2022-03-20 18:15:34,722 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:34,722 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [599526989] [2022-03-20 18:15:34,855 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:34,856 INFO L85 PathProgramCache]: Analyzing trace with hash 34723726, now seen corresponding path program 1 times [2022-03-20 18:15:34,856 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:34,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [492106220] [2022-03-20 18:15:34,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:34,856 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:34,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:34,890 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:34,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:34,893 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:34,893 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:34,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [492106220] [2022-03-20 18:15:34,893 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [492106220] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:34,893 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:34,893 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:35,630 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:35,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [599526989] [2022-03-20 18:15:35,630 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [599526989] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:35,630 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:35,630 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-03-20 18:15:35,630 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1087893570] [2022-03-20 18:15:35,631 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:35,631 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-03-20 18:15:35,631 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:35,631 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-03-20 18:15:35,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1481, Unknown=0, NotChecked=0, Total=1560 [2022-03-20 18:15:35,632 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand has 39 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 38 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:36,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:36,990 INFO L93 Difference]: Finished difference Result 61 states and 63 transitions. [2022-03-20 18:15:36,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-03-20 18:15:36,991 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 38 states have internal predecessors, (42), 2 states have call successors, (3), 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 46 [2022-03-20 18:15:36,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:36,992 INFO L225 Difference]: With dead ends: 61 [2022-03-20 18:15:36,992 INFO L226 Difference]: Without dead ends: 51 [2022-03-20 18:15:36,992 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 665 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=216, Invalid=5186, Unknown=0, NotChecked=0, Total=5402 [2022-03-20 18:15:36,993 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 1659 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 197 SdHoareTripleChecker+Invalid, 1695 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 1659 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:36,993 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 197 Invalid, 1695 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 1659 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-20 18:15:36,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-03-20 18:15:36,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-03-20 18:15:36,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 45 states have (on average 1.0444444444444445) internal successors, (47), 45 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:36,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2022-03-20 18:15:36,996 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 46 [2022-03-20 18:15:36,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:36,996 INFO L478 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2022-03-20 18:15:36,996 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 38 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:36,996 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2022-03-20 18:15:36,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-03-20 18:15:36,997 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:36,997 INFO L499 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:36,997 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2022-03-20 18:15:36,997 INFO L403 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:36,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:36,997 INFO L85 PathProgramCache]: Analyzing trace with hash -1135374297, now seen corresponding path program 34 times [2022-03-20 18:15:36,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:36,997 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1140255115] [2022-03-20 18:15:37,127 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:37,127 INFO L85 PathProgramCache]: Analyzing trace with hash 1000384462, now seen corresponding path program 1 times [2022-03-20 18:15:37,127 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:37,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1833470682] [2022-03-20 18:15:37,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:37,128 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:37,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:37,168 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:37,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:37,172 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:37,172 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:37,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1833470682] [2022-03-20 18:15:37,173 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1833470682] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:37,173 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:37,173 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:37,852 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:37,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1140255115] [2022-03-20 18:15:37,852 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1140255115] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:37,852 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:37,852 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-03-20 18:15:37,853 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940889296] [2022-03-20 18:15:37,853 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:37,853 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-03-20 18:15:37,853 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:37,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-03-20 18:15:37,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1559, Unknown=0, NotChecked=0, Total=1640 [2022-03-20 18:15:37,854 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 40 states, 40 states have (on average 1.075) internal successors, (43), 39 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:39,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:39,198 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2022-03-20 18:15:39,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-03-20 18:15:39,199 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.075) internal successors, (43), 39 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2022-03-20 18:15:39,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:39,199 INFO L225 Difference]: With dead ends: 62 [2022-03-20 18:15:39,199 INFO L226 Difference]: Without dead ends: 52 [2022-03-20 18:15:39,200 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 702 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=222, Invalid=5478, Unknown=0, NotChecked=0, Total=5700 [2022-03-20 18:15:39,201 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 1742 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 1779 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 1742 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:39,201 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 202 Invalid, 1779 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 1742 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-20 18:15:39,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-03-20 18:15:39,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2022-03-20 18:15:39,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:39,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2022-03-20 18:15:39,204 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 47 [2022-03-20 18:15:39,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:39,204 INFO L478 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2022-03-20 18:15:39,204 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.075) internal successors, (43), 39 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:39,204 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2022-03-20 18:15:39,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-03-20 18:15:39,204 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:39,205 INFO L499 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:39,205 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2022-03-20 18:15:39,205 INFO L403 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:39,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:39,205 INFO L85 PathProgramCache]: Analyzing trace with hash 1339198989, now seen corresponding path program 35 times [2022-03-20 18:15:39,205 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:39,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [446842948] [2022-03-20 18:15:39,298 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:39,298 INFO L85 PathProgramCache]: Analyzing trace with hash 1966045198, now seen corresponding path program 1 times [2022-03-20 18:15:39,298 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:39,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1010831883] [2022-03-20 18:15:39,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:39,299 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:39,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:39,326 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:39,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:39,329 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:39,329 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:39,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1010831883] [2022-03-20 18:15:39,329 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1010831883] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:39,329 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:39,329 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:40,008 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:40,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [446842948] [2022-03-20 18:15:40,009 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [446842948] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:40,009 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:40,009 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-03-20 18:15:40,009 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458935416] [2022-03-20 18:15:40,009 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:40,009 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-03-20 18:15:40,009 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:40,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-03-20 18:15:40,010 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1639, Unknown=0, NotChecked=0, Total=1722 [2022-03-20 18:15:40,010 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand has 41 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 40 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:41,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:41,432 INFO L93 Difference]: Finished difference Result 63 states and 65 transitions. [2022-03-20 18:15:41,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-03-20 18:15:41,433 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 40 states have internal predecessors, (44), 2 states have call successors, (3), 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 48 [2022-03-20 18:15:41,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:41,433 INFO L225 Difference]: With dead ends: 63 [2022-03-20 18:15:41,433 INFO L226 Difference]: Without dead ends: 53 [2022-03-20 18:15:41,434 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 740 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=228, Invalid=5778, Unknown=0, NotChecked=0, Total=6006 [2022-03-20 18:15:41,435 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 1827 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 207 SdHoareTripleChecker+Invalid, 1865 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 1827 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:41,435 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 207 Invalid, 1865 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 1827 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-20 18:15:41,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-03-20 18:15:41,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2022-03-20 18:15:41,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 47 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:41,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2022-03-20 18:15:41,439 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 48 [2022-03-20 18:15:41,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:41,439 INFO L478 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2022-03-20 18:15:41,439 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 40 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:41,439 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2022-03-20 18:15:41,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-03-20 18:15:41,440 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:41,440 INFO L499 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:41,440 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2022-03-20 18:15:41,440 INFO L403 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:41,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:41,440 INFO L85 PathProgramCache]: Analyzing trace with hash 741559527, now seen corresponding path program 36 times [2022-03-20 18:15:41,440 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:41,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [6894777] [2022-03-20 18:15:41,534 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:41,535 INFO L85 PathProgramCache]: Analyzing trace with hash -1363261362, now seen corresponding path program 1 times [2022-03-20 18:15:41,535 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:41,535 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [626938760] [2022-03-20 18:15:41,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:41,535 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:41,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:41,573 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:41,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:41,576 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:41,576 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:41,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [626938760] [2022-03-20 18:15:41,576 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [626938760] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:41,576 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:41,576 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:42,341 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:42,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [6894777] [2022-03-20 18:15:42,341 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [6894777] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:42,341 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:42,341 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2022-03-20 18:15:42,341 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781108060] [2022-03-20 18:15:42,341 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:42,342 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-03-20 18:15:42,342 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:42,343 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-03-20 18:15:42,343 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1721, Unknown=0, NotChecked=0, Total=1806 [2022-03-20 18:15:42,344 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand has 42 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 41 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:43,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:43,940 INFO L93 Difference]: Finished difference Result 64 states and 66 transitions. [2022-03-20 18:15:43,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-03-20 18:15:43,940 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 41 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2022-03-20 18:15:43,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:43,941 INFO L225 Difference]: With dead ends: 64 [2022-03-20 18:15:43,941 INFO L226 Difference]: Without dead ends: 54 [2022-03-20 18:15:43,945 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 779 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=234, Invalid=6086, Unknown=0, NotChecked=0, Total=6320 [2022-03-20 18:15:43,945 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 1914 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 1953 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 1914 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:43,945 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 212 Invalid, 1953 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 1914 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-03-20 18:15:43,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-03-20 18:15:43,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2022-03-20 18:15:43,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 48 states have (on average 1.0416666666666667) internal successors, (50), 48 states have internal predecessors, (50), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:43,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2022-03-20 18:15:43,949 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 49 [2022-03-20 18:15:43,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:43,950 INFO L478 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2022-03-20 18:15:43,950 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 41 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:43,950 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2022-03-20 18:15:43,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-03-20 18:15:43,950 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:43,950 INFO L499 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:43,951 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2022-03-20 18:15:43,951 INFO L403 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:43,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:43,951 INFO L85 PathProgramCache]: Analyzing trace with hash -605394611, now seen corresponding path program 37 times [2022-03-20 18:15:43,951 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:43,951 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1610972985] [2022-03-20 18:15:44,090 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:44,091 INFO L85 PathProgramCache]: Analyzing trace with hash -397600626, now seen corresponding path program 1 times [2022-03-20 18:15:44,091 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:44,091 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1472232901] [2022-03-20 18:15:44,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:44,091 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:44,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:44,122 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:44,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:44,132 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:44,132 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:44,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1472232901] [2022-03-20 18:15:44,133 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1472232901] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:44,133 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:44,133 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:44,957 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:44,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1610972985] [2022-03-20 18:15:44,957 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1610972985] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:44,957 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:44,957 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2022-03-20 18:15:44,957 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769578082] [2022-03-20 18:15:44,957 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:44,958 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-03-20 18:15:44,958 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:44,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-03-20 18:15:44,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=1805, Unknown=0, NotChecked=0, Total=1892 [2022-03-20 18:15:44,959 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand has 43 states, 43 states have (on average 1.069767441860465) internal successors, (46), 42 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) [2022-03-20 18:15:46,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:46,606 INFO L93 Difference]: Finished difference Result 65 states and 67 transitions. [2022-03-20 18:15:46,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-03-20 18:15:46,607 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.069767441860465) internal successors, (46), 42 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 [2022-03-20 18:15:46,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:46,608 INFO L225 Difference]: With dead ends: 65 [2022-03-20 18:15:46,608 INFO L226 Difference]: Without dead ends: 55 [2022-03-20 18:15:46,609 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 819 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=240, Invalid=6402, Unknown=0, NotChecked=0, Total=6642 [2022-03-20 18:15:46,609 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 2003 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 217 SdHoareTripleChecker+Invalid, 2043 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 2003 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:46,609 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 217 Invalid, 2043 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 2003 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-03-20 18:15:46,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-03-20 18:15:46,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-03-20 18:15:46,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 49 states have (on average 1.0408163265306123) internal successors, (51), 49 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:46,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2022-03-20 18:15:46,613 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 50 [2022-03-20 18:15:46,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:46,613 INFO L478 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2022-03-20 18:15:46,614 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.069767441860465) internal successors, (46), 42 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) [2022-03-20 18:15:46,614 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2022-03-20 18:15:46,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-03-20 18:15:46,614 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:46,614 INFO L499 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:46,614 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2022-03-20 18:15:46,614 INFO L403 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:46,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:46,615 INFO L85 PathProgramCache]: Analyzing trace with hash 588700071, now seen corresponding path program 38 times [2022-03-20 18:15:46,615 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:46,615 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1110972359] [2022-03-20 18:15:46,751 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:46,752 INFO L85 PathProgramCache]: Analyzing trace with hash 568060110, now seen corresponding path program 1 times [2022-03-20 18:15:46,752 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:46,752 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [845008422] [2022-03-20 18:15:46,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:46,752 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:46,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:46,792 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:46,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:46,795 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:46,795 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:46,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [845008422] [2022-03-20 18:15:46,795 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [845008422] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:46,795 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:46,795 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:47,592 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:47,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1110972359] [2022-03-20 18:15:47,592 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1110972359] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:47,592 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:47,592 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2022-03-20 18:15:47,592 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217124820] [2022-03-20 18:15:47,592 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:47,593 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-03-20 18:15:47,593 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:47,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-03-20 18:15:47,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1891, Unknown=0, NotChecked=0, Total=1980 [2022-03-20 18:15:47,593 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand has 44 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 43 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:49,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:49,304 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2022-03-20 18:15:49,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-03-20 18:15:49,305 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 43 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2022-03-20 18:15:49,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:49,305 INFO L225 Difference]: With dead ends: 66 [2022-03-20 18:15:49,305 INFO L226 Difference]: Without dead ends: 56 [2022-03-20 18:15:49,306 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 860 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=246, Invalid=6726, Unknown=0, NotChecked=0, Total=6972 [2022-03-20 18:15:49,307 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 2094 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 2135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 2094 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:49,307 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 222 Invalid, 2135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 2094 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-03-20 18:15:49,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-03-20 18:15:49,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2022-03-20 18:15:49,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 50 states have (on average 1.04) internal successors, (52), 50 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:49,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2022-03-20 18:15:49,311 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 51 [2022-03-20 18:15:49,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:49,311 INFO L478 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2022-03-20 18:15:49,311 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 43 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:49,311 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2022-03-20 18:15:49,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-03-20 18:15:49,311 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:49,311 INFO L499 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:49,312 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2022-03-20 18:15:49,312 INFO L403 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:49,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:49,312 INFO L85 PathProgramCache]: Analyzing trace with hash -1049070451, now seen corresponding path program 39 times [2022-03-20 18:15:49,312 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:49,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [424286046] [2022-03-20 18:15:49,415 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:49,415 INFO L85 PathProgramCache]: Analyzing trace with hash 1533720846, now seen corresponding path program 1 times [2022-03-20 18:15:49,415 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:49,415 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2091171721] [2022-03-20 18:15:49,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:49,415 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:49,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:49,443 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:49,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:49,452 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:49,452 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:49,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2091171721] [2022-03-20 18:15:49,452 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2091171721] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:49,452 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:49,452 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:50,267 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:50,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [424286046] [2022-03-20 18:15:50,268 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [424286046] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:50,268 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:50,268 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2022-03-20 18:15:50,268 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [31965753] [2022-03-20 18:15:50,268 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:50,268 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-03-20 18:15:50,268 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:50,268 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-03-20 18:15:50,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=1979, Unknown=0, NotChecked=0, Total=2070 [2022-03-20 18:15:50,269 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand has 45 states, 45 states have (on average 1.0666666666666667) internal successors, (48), 44 states have internal predecessors, (48), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:52,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:52,050 INFO L93 Difference]: Finished difference Result 67 states and 69 transitions. [2022-03-20 18:15:52,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-03-20 18:15:52,050 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.0666666666666667) internal successors, (48), 44 states have internal predecessors, (48), 2 states have call successors, (3), 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 52 [2022-03-20 18:15:52,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:52,051 INFO L225 Difference]: With dead ends: 67 [2022-03-20 18:15:52,051 INFO L226 Difference]: Without dead ends: 57 [2022-03-20 18:15:52,051 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 902 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=252, Invalid=7058, Unknown=0, NotChecked=0, Total=7310 [2022-03-20 18:15:52,052 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 212 mSDsCounter, 0 mSdLazyCounter, 2187 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 227 SdHoareTripleChecker+Invalid, 2229 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 2187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:52,052 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 227 Invalid, 2229 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 2187 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-03-20 18:15:52,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-03-20 18:15:52,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-03-20 18:15:52,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 51 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:52,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2022-03-20 18:15:52,056 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 52 [2022-03-20 18:15:52,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:52,056 INFO L478 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2022-03-20 18:15:52,056 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.0666666666666667) internal successors, (48), 44 states have internal predecessors, (48), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:52,056 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2022-03-20 18:15:52,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-03-20 18:15:52,056 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:52,057 INFO L499 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:52,057 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2022-03-20 18:15:52,057 INFO L403 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:52,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:52,057 INFO L85 PathProgramCache]: Analyzing trace with hash -280349081, now seen corresponding path program 40 times [2022-03-20 18:15:52,057 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:52,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [474562877] [2022-03-20 18:15:52,152 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:52,153 INFO L85 PathProgramCache]: Analyzing trace with hash -1795585714, now seen corresponding path program 1 times [2022-03-20 18:15:52,153 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:52,153 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724605859] [2022-03-20 18:15:52,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:52,153 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:52,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:52,182 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:52,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:52,185 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:52,185 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:52,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724605859] [2022-03-20 18:15:52,185 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1724605859] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:52,185 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:52,185 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:53,023 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:53,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [474562877] [2022-03-20 18:15:53,023 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [474562877] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:53,023 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:53,023 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2022-03-20 18:15:53,023 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166391892] [2022-03-20 18:15:53,023 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:53,024 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-03-20 18:15:53,024 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:53,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-03-20 18:15:53,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=2069, Unknown=0, NotChecked=0, Total=2162 [2022-03-20 18:15:53,025 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand has 46 states, 46 states have (on average 1.065217391304348) internal successors, (49), 45 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:54,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:54,980 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2022-03-20 18:15:54,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-03-20 18:15:54,981 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.065217391304348) internal successors, (49), 45 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2022-03-20 18:15:54,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:54,981 INFO L225 Difference]: With dead ends: 68 [2022-03-20 18:15:54,981 INFO L226 Difference]: Without dead ends: 58 [2022-03-20 18:15:54,982 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 945 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=258, Invalid=7398, Unknown=0, NotChecked=0, Total=7656 [2022-03-20 18:15:54,982 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 217 mSDsCounter, 0 mSdLazyCounter, 2282 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 2325 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 2282 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:54,982 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 232 Invalid, 2325 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 2282 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-03-20 18:15:54,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-03-20 18:15:54,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2022-03-20 18:15:54,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 52 states have (on average 1.0384615384615385) internal successors, (54), 52 states have internal predecessors, (54), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:54,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2022-03-20 18:15:54,986 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 53 [2022-03-20 18:15:54,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:54,987 INFO L478 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2022-03-20 18:15:54,987 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.065217391304348) internal successors, (49), 45 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:54,987 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2022-03-20 18:15:54,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-03-20 18:15:54,987 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:54,987 INFO L499 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:54,987 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2022-03-20 18:15:54,988 INFO L403 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:54,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:54,988 INFO L85 PathProgramCache]: Analyzing trace with hash 2075176909, now seen corresponding path program 41 times [2022-03-20 18:15:54,988 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:54,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [390572641] [2022-03-20 18:15:55,092 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:55,092 INFO L85 PathProgramCache]: Analyzing trace with hash -829924978, now seen corresponding path program 1 times [2022-03-20 18:15:55,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:55,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [57302458] [2022-03-20 18:15:55,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:55,092 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:55,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:55,123 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:55,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:55,125 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:55,126 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:55,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [57302458] [2022-03-20 18:15:55,126 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [57302458] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:55,126 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:55,126 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:56,020 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:56,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [390572641] [2022-03-20 18:15:56,020 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [390572641] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:56,020 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:56,020 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2022-03-20 18:15:56,020 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791679622] [2022-03-20 18:15:56,020 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:56,021 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-03-20 18:15:56,021 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:56,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-03-20 18:15:56,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=2161, Unknown=0, NotChecked=0, Total=2256 [2022-03-20 18:15:56,022 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand has 47 states, 47 states have (on average 1.0638297872340425) internal successors, (50), 46 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:58,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:58,213 INFO L93 Difference]: Finished difference Result 69 states and 71 transitions. [2022-03-20 18:15:58,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-03-20 18:15:58,214 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.0638297872340425) internal successors, (50), 46 states have internal predecessors, (50), 2 states have call successors, (3), 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 54 [2022-03-20 18:15:58,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:58,214 INFO L225 Difference]: With dead ends: 69 [2022-03-20 18:15:58,214 INFO L226 Difference]: Without dead ends: 59 [2022-03-20 18:15:58,215 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 989 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=264, Invalid=7746, Unknown=0, NotChecked=0, Total=8010 [2022-03-20 18:15:58,216 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 2379 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 237 SdHoareTripleChecker+Invalid, 2423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 2379 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:58,216 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 237 Invalid, 2423 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 2379 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-03-20 18:15:58,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-03-20 18:15:58,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2022-03-20 18:15:58,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 53 states have (on average 1.0377358490566038) internal successors, (55), 53 states have internal predecessors, (55), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:58,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2022-03-20 18:15:58,220 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 54 [2022-03-20 18:15:58,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:58,220 INFO L478 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2022-03-20 18:15:58,220 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.0638297872340425) internal successors, (50), 46 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:58,221 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2022-03-20 18:15:58,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-03-20 18:15:58,221 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:58,221 INFO L499 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:58,221 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2022-03-20 18:15:58,221 INFO L403 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:58,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:58,222 INFO L85 PathProgramCache]: Analyzing trace with hash 2082038567, now seen corresponding path program 42 times [2022-03-20 18:15:58,222 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:58,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1973687813] [2022-03-20 18:15:58,356 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:58,356 INFO L85 PathProgramCache]: Analyzing trace with hash 135735758, now seen corresponding path program 1 times [2022-03-20 18:15:58,356 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:58,357 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [39582126] [2022-03-20 18:15:58,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:58,357 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:58,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:58,391 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:58,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:58,395 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:58,395 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:58,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [39582126] [2022-03-20 18:15:58,395 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [39582126] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:58,396 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:58,396 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:59,318 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:59,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1973687813] [2022-03-20 18:15:59,318 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1973687813] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:59,318 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:59,319 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2022-03-20 18:15:59,319 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477005915] [2022-03-20 18:15:59,319 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:59,319 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-03-20 18:15:59,319 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:59,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-03-20 18:15:59,320 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=2255, Unknown=0, NotChecked=0, Total=2352 [2022-03-20 18:15:59,320 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand has 48 states, 48 states have (on average 1.0625) internal successors, (51), 47 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:16:01,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:16:01,481 INFO L93 Difference]: Finished difference Result 70 states and 72 transitions. [2022-03-20 18:16:01,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-03-20 18:16:01,482 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.0625) internal successors, (51), 47 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2022-03-20 18:16:01,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:16:01,482 INFO L225 Difference]: With dead ends: 70 [2022-03-20 18:16:01,483 INFO L226 Difference]: Without dead ends: 60 [2022-03-20 18:16:01,483 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1034 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=270, Invalid=8102, Unknown=0, NotChecked=0, Total=8372 [2022-03-20 18:16:01,484 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 2478 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 2523 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 2478 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:16:01,484 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 242 Invalid, 2523 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 2478 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-03-20 18:16:01,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-03-20 18:16:01,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2022-03-20 18:16:01,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 54 states have (on average 1.037037037037037) internal successors, (56), 54 states have internal predecessors, (56), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:16:01,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2022-03-20 18:16:01,488 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 55 [2022-03-20 18:16:01,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:16:01,489 INFO L478 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2022-03-20 18:16:01,489 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.0625) internal successors, (51), 47 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:16:01,489 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2022-03-20 18:16:01,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-03-20 18:16:01,489 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:16:01,489 INFO L499 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:16:01,489 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2022-03-20 18:16:01,490 INFO L403 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:16:01,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:16:01,490 INFO L85 PathProgramCache]: Analyzing trace with hash -2000217331, now seen corresponding path program 43 times [2022-03-20 18:16:01,490 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:01,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1328899276] [2022-03-20 18:16:01,630 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:16:01,631 INFO L85 PathProgramCache]: Analyzing trace with hash 1101396494, now seen corresponding path program 1 times [2022-03-20 18:16:01,631 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:16:01,631 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1131247206] [2022-03-20 18:16:01,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:16:01,631 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:16:01,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:01,666 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:16:01,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:01,669 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:16:01,669 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:16:01,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1131247206] [2022-03-20 18:16:01,669 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1131247206] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:01,669 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:01,670 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:16:02,628 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:16:02,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1328899276] [2022-03-20 18:16:02,628 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1328899276] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:02,629 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:02,629 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2022-03-20 18:16:02,629 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1014924781] [2022-03-20 18:16:02,629 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:16:02,629 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-03-20 18:16:02,629 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:02,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-03-20 18:16:02,629 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=2351, Unknown=0, NotChecked=0, Total=2450 [2022-03-20 18:16:02,630 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 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) [2022-03-20 18:16:05,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:16:05,022 INFO L93 Difference]: Finished difference Result 71 states and 73 transitions. [2022-03-20 18:16:05,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-03-20 18:16:05,023 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 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 [2022-03-20 18:16:05,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:16:05,023 INFO L225 Difference]: With dead ends: 71 [2022-03-20 18:16:05,023 INFO L226 Difference]: Without dead ends: 61 [2022-03-20 18:16:05,024 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1080 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=276, Invalid=8466, Unknown=0, NotChecked=0, Total=8742 [2022-03-20 18:16:05,025 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 232 mSDsCounter, 0 mSdLazyCounter, 2579 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 247 SdHoareTripleChecker+Invalid, 2625 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 2579 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:16:05,025 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 247 Invalid, 2625 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 2579 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-03-20 18:16:05,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-03-20 18:16:05,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2022-03-20 18:16:05,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 55 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:16:05,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2022-03-20 18:16:05,028 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 56 [2022-03-20 18:16:05,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:16:05,028 INFO L478 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2022-03-20 18:16:05,028 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 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) [2022-03-20 18:16:05,028 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2022-03-20 18:16:05,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-03-20 18:16:05,028 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:16:05,028 INFO L499 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:16:05,029 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2022-03-20 18:16:05,029 INFO L403 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:16:05,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:16:05,029 INFO L85 PathProgramCache]: Analyzing trace with hash 298868711, now seen corresponding path program 44 times [2022-03-20 18:16:05,029 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:05,029 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [318813649] [2022-03-20 18:16:05,173 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:16:05,174 INFO L85 PathProgramCache]: Analyzing trace with hash 2067057230, now seen corresponding path program 1 times [2022-03-20 18:16:05,174 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:16:05,174 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1959690173] [2022-03-20 18:16:05,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:16:05,174 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:16:05,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:05,204 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:16:05,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:05,207 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:16:05,207 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:16:05,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1959690173] [2022-03-20 18:16:05,207 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1959690173] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:05,207 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:05,207 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:16:06,257 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:16:06,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [318813649] [2022-03-20 18:16:06,258 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [318813649] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:06,258 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:06,258 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2022-03-20 18:16:06,258 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795818485] [2022-03-20 18:16:06,258 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:16:06,258 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-03-20 18:16:06,258 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:06,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-03-20 18:16:06,259 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=2449, Unknown=0, NotChecked=0, Total=2550 [2022-03-20 18:16:06,259 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand has 50 states, 50 states have (on average 1.06) internal successors, (53), 49 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:16:08,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:16:08,778 INFO L93 Difference]: Finished difference Result 72 states and 74 transitions. [2022-03-20 18:16:08,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-03-20 18:16:08,779 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.06) internal successors, (53), 49 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2022-03-20 18:16:08,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:16:08,779 INFO L225 Difference]: With dead ends: 72 [2022-03-20 18:16:08,779 INFO L226 Difference]: Without dead ends: 62 [2022-03-20 18:16:08,780 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1127 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=282, Invalid=8838, Unknown=0, NotChecked=0, Total=9120 [2022-03-20 18:16:08,780 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 2682 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 2729 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 2682 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:16:08,780 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 252 Invalid, 2729 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 2682 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-03-20 18:16:08,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-03-20 18:16:08,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2022-03-20 18:16:08,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 56 states have (on average 1.0357142857142858) internal successors, (58), 56 states have internal predecessors, (58), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:16:08,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2022-03-20 18:16:08,789 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 57 [2022-03-20 18:16:08,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:16:08,789 INFO L478 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2022-03-20 18:16:08,789 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.06) internal successors, (53), 49 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:16:08,789 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2022-03-20 18:16:08,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-03-20 18:16:08,789 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:16:08,789 INFO L499 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:16:08,789 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2022-03-20 18:16:08,790 INFO L403 AbstractCegarLoop]: === Iteration 46 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:16:08,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:16:08,790 INFO L85 PathProgramCache]: Analyzing trace with hash -1443908019, now seen corresponding path program 45 times [2022-03-20 18:16:08,790 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:08,790 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [360443762] [2022-03-20 18:16:08,931 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:16:08,931 INFO L85 PathProgramCache]: Analyzing trace with hash -1262249330, now seen corresponding path program 1 times [2022-03-20 18:16:08,931 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:16:08,931 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1961779927] [2022-03-20 18:16:08,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:16:08,931 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:16:08,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:08,967 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:16:08,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:08,970 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:16:08,970 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:16:08,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1961779927] [2022-03-20 18:16:08,970 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1961779927] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:08,970 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:08,970 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:16:10,006 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:16:10,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [360443762] [2022-03-20 18:16:10,006 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [360443762] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:10,006 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:10,007 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2022-03-20 18:16:10,007 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230522987] [2022-03-20 18:16:10,007 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:16:10,007 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-03-20 18:16:10,007 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:10,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-03-20 18:16:10,008 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=2549, Unknown=0, NotChecked=0, Total=2652 [2022-03-20 18:16:10,008 INFO L87 Difference]: Start difference. First operand 62 states and 63 transitions. Second operand has 51 states, 51 states have (on average 1.0588235294117647) internal successors, (54), 50 states have internal predecessors, (54), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:16:12,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:16:12,581 INFO L93 Difference]: Finished difference Result 73 states and 75 transitions. [2022-03-20 18:16:12,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-03-20 18:16:12,582 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.0588235294117647) internal successors, (54), 50 states have internal predecessors, (54), 2 states have call successors, (3), 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 58 [2022-03-20 18:16:12,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:16:12,582 INFO L225 Difference]: With dead ends: 73 [2022-03-20 18:16:12,583 INFO L226 Difference]: Without dead ends: 63 [2022-03-20 18:16:12,584 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1175 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=288, Invalid=9218, Unknown=0, NotChecked=0, Total=9506 [2022-03-20 18:16:12,584 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 242 mSDsCounter, 0 mSdLazyCounter, 2787 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 257 SdHoareTripleChecker+Invalid, 2835 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 2787 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:16:12,584 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 257 Invalid, 2835 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 2787 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-03-20 18:16:12,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-03-20 18:16:12,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2022-03-20 18:16:12,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 57 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:16:12,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2022-03-20 18:16:12,588 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 58 [2022-03-20 18:16:12,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:16:12,589 INFO L478 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2022-03-20 18:16:12,589 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.0588235294117647) internal successors, (54), 50 states have internal predecessors, (54), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:16:12,589 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2022-03-20 18:16:12,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-20 18:16:12,589 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:16:12,589 INFO L499 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:16:12,590 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2022-03-20 18:16:12,590 INFO L403 AbstractCegarLoop]: === Iteration 47 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:16:12,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:16:12,590 INFO L85 PathProgramCache]: Analyzing trace with hash 364588199, now seen corresponding path program 46 times [2022-03-20 18:16:12,590 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:12,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1059934406] [2022-03-20 18:16:12,692 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:16:12,692 INFO L85 PathProgramCache]: Analyzing trace with hash -296588594, now seen corresponding path program 1 times [2022-03-20 18:16:12,692 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:16:12,692 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1392833377] [2022-03-20 18:16:12,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:16:12,692 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:16:12,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:12,723 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:16:12,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:12,726 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:16:12,727 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:16:12,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1392833377] [2022-03-20 18:16:12,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1392833377] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:12,727 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:12,727 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:16:13,796 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:16:13,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1059934406] [2022-03-20 18:16:13,796 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1059934406] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:13,796 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:13,796 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2022-03-20 18:16:13,796 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1563885265] [2022-03-20 18:16:13,796 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:16:13,796 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-03-20 18:16:13,797 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:13,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-03-20 18:16:13,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=2651, Unknown=0, NotChecked=0, Total=2756 [2022-03-20 18:16:13,797 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand has 52 states, 52 states have (on average 1.0576923076923077) internal successors, (55), 51 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:16:16,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:16:16,639 INFO L93 Difference]: Finished difference Result 74 states and 76 transitions. [2022-03-20 18:16:16,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-03-20 18:16:16,640 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.0576923076923077) internal successors, (55), 51 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2022-03-20 18:16:16,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:16:16,640 INFO L225 Difference]: With dead ends: 74 [2022-03-20 18:16:16,640 INFO L226 Difference]: Without dead ends: 64 [2022-03-20 18:16:16,641 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1224 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=294, Invalid=9606, Unknown=0, NotChecked=0, Total=9900 [2022-03-20 18:16:16,642 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 2894 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 2943 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 2894 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-03-20 18:16:16,642 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 262 Invalid, 2943 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 2894 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-03-20 18:16:16,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-03-20 18:16:16,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2022-03-20 18:16:16,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 58 states have internal predecessors, (60), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:16:16,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2022-03-20 18:16:16,647 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 59 [2022-03-20 18:16:16,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:16:16,647 INFO L478 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2022-03-20 18:16:16,647 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.0576923076923077) internal successors, (55), 51 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:16:16,647 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2022-03-20 18:16:16,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-03-20 18:16:16,648 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:16:16,648 INFO L499 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:16:16,648 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2022-03-20 18:16:16,648 INFO L403 AbstractCegarLoop]: === Iteration 48 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:16:16,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:16:16,648 INFO L85 PathProgramCache]: Analyzing trace with hash 593396109, now seen corresponding path program 47 times [2022-03-20 18:16:16,648 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:16,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [296817787] [2022-03-20 18:16:16,751 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:16:16,751 INFO L85 PathProgramCache]: Analyzing trace with hash 669072142, now seen corresponding path program 1 times [2022-03-20 18:16:16,751 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:16:16,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1339295504] [2022-03-20 18:16:16,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:16:16,751 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:16:16,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:16,782 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:16:16,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:16,785 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:16:16,785 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:16:16,786 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1339295504] [2022-03-20 18:16:16,786 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1339295504] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:16,786 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:16,786 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:16:17,925 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:16:17,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [296817787] [2022-03-20 18:16:17,926 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [296817787] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:17,926 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:17,926 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2022-03-20 18:16:17,926 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244689196] [2022-03-20 18:16:17,926 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:16:17,926 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-03-20 18:16:17,926 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:17,927 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-03-20 18:16:17,927 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=2755, Unknown=0, NotChecked=0, Total=2862 [2022-03-20 18:16:17,927 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand has 53 states, 53 states have (on average 1.0566037735849056) internal successors, (56), 52 states have internal predecessors, (56), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:16:20,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:16:20,937 INFO L93 Difference]: Finished difference Result 75 states and 77 transitions. [2022-03-20 18:16:20,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-03-20 18:16:20,938 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.0566037735849056) internal successors, (56), 52 states have internal predecessors, (56), 2 states have call successors, (3), 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 60 [2022-03-20 18:16:20,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:16:20,938 INFO L225 Difference]: With dead ends: 75 [2022-03-20 18:16:20,939 INFO L226 Difference]: Without dead ends: 65 [2022-03-20 18:16:20,940 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1274 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=300, Invalid=10002, Unknown=0, NotChecked=0, Total=10302 [2022-03-20 18:16:20,940 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 3003 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 267 SdHoareTripleChecker+Invalid, 3053 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 3003 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-03-20 18:16:20,941 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 267 Invalid, 3053 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 3003 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-03-20 18:16:20,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-03-20 18:16:20,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2022-03-20 18:16:20,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 59 states have (on average 1.0338983050847457) internal successors, (61), 59 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:16:20,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 66 transitions. [2022-03-20 18:16:20,945 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 66 transitions. Word has length 60 [2022-03-20 18:16:20,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:16:20,946 INFO L478 AbstractCegarLoop]: Abstraction has 65 states and 66 transitions. [2022-03-20 18:16:20,946 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.0566037735849056) internal successors, (56), 52 states have internal predecessors, (56), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:16:20,946 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 66 transitions. [2022-03-20 18:16:20,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-03-20 18:16:20,946 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:16:20,946 INFO L499 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:16:20,946 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2022-03-20 18:16:20,946 INFO L403 AbstractCegarLoop]: === Iteration 49 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:16:20,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:16:20,947 INFO L85 PathProgramCache]: Analyzing trace with hash -903493273, now seen corresponding path program 48 times [2022-03-20 18:16:20,947 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:20,947 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [350570833] [2022-03-20 18:16:21,090 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:16:21,091 INFO L85 PathProgramCache]: Analyzing trace with hash 1634732878, now seen corresponding path program 1 times [2022-03-20 18:16:21,091 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:16:21,091 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2083037727] [2022-03-20 18:16:21,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:16:21,091 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:16:21,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:21,128 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:16:21,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:21,131 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:16:21,131 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:16:21,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2083037727] [2022-03-20 18:16:21,131 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2083037727] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:21,131 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:21,131 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:16:22,303 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:16:22,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [350570833] [2022-03-20 18:16:22,304 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [350570833] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:22,304 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:22,304 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2022-03-20 18:16:22,304 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845624125] [2022-03-20 18:16:22,304 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:16:22,304 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-03-20 18:16:22,304 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:22,304 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-03-20 18:16:22,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=2861, Unknown=0, NotChecked=0, Total=2970 [2022-03-20 18:16:22,305 INFO L87 Difference]: Start difference. First operand 65 states and 66 transitions. Second operand has 54 states, 54 states have (on average 1.0555555555555556) internal successors, (57), 53 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:16:25,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:16:25,454 INFO L93 Difference]: Finished difference Result 76 states and 78 transitions. [2022-03-20 18:16:25,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-03-20 18:16:25,454 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.0555555555555556) internal successors, (57), 53 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 61 [2022-03-20 18:16:25,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:16:25,455 INFO L225 Difference]: With dead ends: 76 [2022-03-20 18:16:25,455 INFO L226 Difference]: Without dead ends: 66 [2022-03-20 18:16:25,456 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1325 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=306, Invalid=10406, Unknown=0, NotChecked=0, Total=10712 [2022-03-20 18:16:25,457 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 3114 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 272 SdHoareTripleChecker+Invalid, 3165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 3114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:16:25,457 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 272 Invalid, 3165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 3114 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-03-20 18:16:25,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-03-20 18:16:25,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2022-03-20 18:16:25,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 60 states have (on average 1.0333333333333334) internal successors, (62), 60 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:16:25,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2022-03-20 18:16:25,462 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 61 [2022-03-20 18:16:25,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:16:25,462 INFO L478 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2022-03-20 18:16:25,462 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 1.0555555555555556) internal successors, (57), 53 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:16:25,462 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2022-03-20 18:16:25,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-03-20 18:16:25,462 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:16:25,463 INFO L499 BasicCegarLoop]: trace histogram [49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:16:25,463 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2022-03-20 18:16:25,463 INFO L403 AbstractCegarLoop]: === Iteration 50 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:16:25,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:16:25,463 INFO L85 PathProgramCache]: Analyzing trace with hash -62423859, now seen corresponding path program 49 times [2022-03-20 18:16:25,463 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:25,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1571431857] [2022-03-20 18:16:25,632 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:16:25,633 INFO L85 PathProgramCache]: Analyzing trace with hash -1694573682, now seen corresponding path program 1 times [2022-03-20 18:16:25,633 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:16:25,633 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1504351784] [2022-03-20 18:16:25,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:16:25,633 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:16:25,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:25,662 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:16:25,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:25,665 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:16:25,665 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:16:25,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1504351784] [2022-03-20 18:16:25,665 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1504351784] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:25,665 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:25,666 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:16:26,848 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:16:26,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1571431857] [2022-03-20 18:16:26,848 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1571431857] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:26,848 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:26,848 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [55] imperfect sequences [] total 55 [2022-03-20 18:16:26,848 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44290407] [2022-03-20 18:16:26,848 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:16:26,849 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-03-20 18:16:26,849 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:26,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-03-20 18:16:26,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=2969, Unknown=0, NotChecked=0, Total=3080 [2022-03-20 18:16:26,849 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand has 55 states, 55 states have (on average 1.0545454545454545) internal successors, (58), 54 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) [2022-03-20 18:16:29,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:16:29,986 INFO L93 Difference]: Finished difference Result 77 states and 79 transitions. [2022-03-20 18:16:29,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-03-20 18:16:29,987 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.0545454545454545) internal successors, (58), 54 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 [2022-03-20 18:16:29,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:16:29,987 INFO L225 Difference]: With dead ends: 77 [2022-03-20 18:16:29,987 INFO L226 Difference]: Without dead ends: 67 [2022-03-20 18:16:29,989 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1377 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=312, Invalid=10818, Unknown=0, NotChecked=0, Total=11130 [2022-03-20 18:16:29,989 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 3227 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 3279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 3227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:16:29,989 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 277 Invalid, 3279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 3227 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-03-20 18:16:29,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-03-20 18:16:29,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2022-03-20 18:16:29,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 61 states have (on average 1.0327868852459017) internal successors, (63), 61 states have internal predecessors, (63), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:16:29,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2022-03-20 18:16:29,993 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 62 [2022-03-20 18:16:29,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:16:29,993 INFO L478 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2022-03-20 18:16:29,993 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 1.0545454545454545) internal successors, (58), 54 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) [2022-03-20 18:16:29,993 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2022-03-20 18:16:29,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-03-20 18:16:29,993 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:16:29,994 INFO L499 BasicCegarLoop]: trace histogram [50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:16:29,994 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2022-03-20 18:16:29,994 INFO L403 AbstractCegarLoop]: === Iteration 51 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:16:29,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:16:29,994 INFO L85 PathProgramCache]: Analyzing trace with hash 240924199, now seen corresponding path program 50 times [2022-03-20 18:16:29,994 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:29,994 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1269775124] [2022-03-20 18:16:30,130 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:16:30,130 INFO L85 PathProgramCache]: Analyzing trace with hash -728912946, now seen corresponding path program 1 times [2022-03-20 18:16:30,130 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:16:30,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1676081508] [2022-03-20 18:16:30,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:16:30,131 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:16:30,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:30,160 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:16:30,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:30,174 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:16:30,174 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:16:30,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1676081508] [2022-03-20 18:16:30,174 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1676081508] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:30,174 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:30,174 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:16:31,416 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:16:31,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1269775124] [2022-03-20 18:16:31,417 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1269775124] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:31,417 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:31,417 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [56] imperfect sequences [] total 56 [2022-03-20 18:16:31,417 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079564420] [2022-03-20 18:16:31,417 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:16:31,417 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-03-20 18:16:31,417 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:31,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-03-20 18:16:31,418 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=3079, Unknown=0, NotChecked=0, Total=3192 [2022-03-20 18:16:31,418 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand has 56 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 55 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:16:35,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:16:35,007 INFO L93 Difference]: Finished difference Result 78 states and 80 transitions. [2022-03-20 18:16:35,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-03-20 18:16:35,008 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 55 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 63 [2022-03-20 18:16:35,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:16:35,009 INFO L225 Difference]: With dead ends: 78 [2022-03-20 18:16:35,009 INFO L226 Difference]: Without dead ends: 68 [2022-03-20 18:16:35,010 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1430 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=318, Invalid=11238, Unknown=0, NotChecked=0, Total=11556 [2022-03-20 18:16:35,010 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 3342 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 282 SdHoareTripleChecker+Invalid, 3395 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 3342 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:16:35,011 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 282 Invalid, 3395 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 3342 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2022-03-20 18:16:35,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-03-20 18:16:35,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2022-03-20 18:16:35,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 62 states have (on average 1.032258064516129) internal successors, (64), 62 states have internal predecessors, (64), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:16:35,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 69 transitions. [2022-03-20 18:16:35,015 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 69 transitions. Word has length 63 [2022-03-20 18:16:35,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:16:35,015 INFO L478 AbstractCegarLoop]: Abstraction has 68 states and 69 transitions. [2022-03-20 18:16:35,015 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 55 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:16:35,016 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 69 transitions. [2022-03-20 18:16:35,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-03-20 18:16:35,016 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:16:35,016 INFO L499 BasicCegarLoop]: trace histogram [51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:16:35,016 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2022-03-20 18:16:35,016 INFO L403 AbstractCegarLoop]: === Iteration 52 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:16:35,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:16:35,016 INFO L85 PathProgramCache]: Analyzing trace with hash 1054779405, now seen corresponding path program 51 times [2022-03-20 18:16:35,017 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:35,017 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1616061456] [2022-03-20 18:16:35,150 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:16:35,151 INFO L85 PathProgramCache]: Analyzing trace with hash 236747790, now seen corresponding path program 1 times [2022-03-20 18:16:35,151 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:16:35,151 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1904289472] [2022-03-20 18:16:35,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:16:35,151 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:16:35,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:35,183 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:16:35,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:35,196 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:16:35,196 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:16:35,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1904289472] [2022-03-20 18:16:35,196 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1904289472] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:35,196 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:35,196 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:16:36,518 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:16:36,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1616061456] [2022-03-20 18:16:36,519 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1616061456] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:36,519 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:36,519 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2022-03-20 18:16:36,519 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653725049] [2022-03-20 18:16:36,519 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:16:36,519 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-03-20 18:16:36,519 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:36,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-03-20 18:16:36,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=3191, Unknown=0, NotChecked=0, Total=3306 [2022-03-20 18:16:36,520 INFO L87 Difference]: Start difference. First operand 68 states and 69 transitions. Second operand has 57 states, 57 states have (on average 1.0526315789473684) internal successors, (60), 56 states have internal predecessors, (60), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:16:40,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:16:40,243 INFO L93 Difference]: Finished difference Result 79 states and 81 transitions. [2022-03-20 18:16:40,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-03-20 18:16:40,244 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.0526315789473684) internal successors, (60), 56 states have internal predecessors, (60), 2 states have call successors, (3), 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 64 [2022-03-20 18:16:40,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:16:40,244 INFO L225 Difference]: With dead ends: 79 [2022-03-20 18:16:40,244 INFO L226 Difference]: Without dead ends: 69 [2022-03-20 18:16:40,245 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1484 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=324, Invalid=11666, Unknown=0, NotChecked=0, Total=11990 [2022-03-20 18:16:40,246 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 272 mSDsCounter, 0 mSdLazyCounter, 3459 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 287 SdHoareTripleChecker+Invalid, 3513 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 3459 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:16:40,246 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 287 Invalid, 3513 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 3459 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-03-20 18:16:40,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-03-20 18:16:40,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2022-03-20 18:16:40,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 63 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:16:40,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2022-03-20 18:16:40,250 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 64 [2022-03-20 18:16:40,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:16:40,250 INFO L478 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2022-03-20 18:16:40,250 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 1.0526315789473684) internal successors, (60), 56 states have internal predecessors, (60), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:16:40,250 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2022-03-20 18:16:40,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-03-20 18:16:40,250 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:16:40,250 INFO L499 BasicCegarLoop]: trace histogram [52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:16:40,251 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2022-03-20 18:16:40,251 INFO L403 AbstractCegarLoop]: === Iteration 53 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:16:40,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:16:40,251 INFO L85 PathProgramCache]: Analyzing trace with hash 514487015, now seen corresponding path program 52 times [2022-03-20 18:16:40,251 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:40,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1783444156] [2022-03-20 18:16:40,399 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:16:40,400 INFO L85 PathProgramCache]: Analyzing trace with hash 1202408526, now seen corresponding path program 1 times [2022-03-20 18:16:40,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:16:40,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1898396668] [2022-03-20 18:16:40,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:16:40,400 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:16:40,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:40,431 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:16:40,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:40,434 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:16:40,434 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:16:40,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1898396668] [2022-03-20 18:16:40,435 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1898396668] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:40,435 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:40,435 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:16:41,743 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:16:41,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1783444156] [2022-03-20 18:16:41,743 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1783444156] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:41,743 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:41,743 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [58] imperfect sequences [] total 58 [2022-03-20 18:16:41,743 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229725713] [2022-03-20 18:16:41,743 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:16:41,744 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-03-20 18:16:41,744 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:41,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-03-20 18:16:41,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=3305, Unknown=0, NotChecked=0, Total=3422 [2022-03-20 18:16:41,745 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand has 58 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 57 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:16:45,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:16:45,289 INFO L93 Difference]: Finished difference Result 80 states and 82 transitions. [2022-03-20 18:16:45,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-03-20 18:16:45,290 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 57 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2022-03-20 18:16:45,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:16:45,290 INFO L225 Difference]: With dead ends: 80 [2022-03-20 18:16:45,290 INFO L226 Difference]: Without dead ends: 70 [2022-03-20 18:16:45,291 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1539 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=330, Invalid=12102, Unknown=0, NotChecked=0, Total=12432 [2022-03-20 18:16:45,292 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 277 mSDsCounter, 0 mSdLazyCounter, 3578 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 292 SdHoareTripleChecker+Invalid, 3633 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 3578 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:16:45,292 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 292 Invalid, 3633 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 3578 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-03-20 18:16:45,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-03-20 18:16:45,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2022-03-20 18:16:45,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 64 states have (on average 1.03125) internal successors, (66), 64 states have internal predecessors, (66), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:16:45,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 71 transitions. [2022-03-20 18:16:45,297 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 71 transitions. Word has length 65 [2022-03-20 18:16:45,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:16:45,297 INFO L478 AbstractCegarLoop]: Abstraction has 70 states and 71 transitions. [2022-03-20 18:16:45,297 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 57 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:16:45,297 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 71 transitions. [2022-03-20 18:16:45,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-03-20 18:16:45,297 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:16:45,297 INFO L499 BasicCegarLoop]: trace histogram [53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:16:45,298 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2022-03-20 18:16:45,298 INFO L403 AbstractCegarLoop]: === Iteration 54 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:16:45,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:16:45,298 INFO L85 PathProgramCache]: Analyzing trace with hash 945292109, now seen corresponding path program 53 times [2022-03-20 18:16:45,298 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:45,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2047894429] [2022-03-20 18:16:45,403 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:16:45,403 INFO L85 PathProgramCache]: Analyzing trace with hash -2126898034, now seen corresponding path program 1 times [2022-03-20 18:16:45,403 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:16:45,403 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1143430839] [2022-03-20 18:16:45,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:16:45,404 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:16:45,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:45,443 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:16:45,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:45,446 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:16:45,447 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:16:45,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1143430839] [2022-03-20 18:16:45,447 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1143430839] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:45,447 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:45,447 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:16:46,812 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:16:46,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2047894429] [2022-03-20 18:16:46,812 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2047894429] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:46,812 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:46,812 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [59] imperfect sequences [] total 59 [2022-03-20 18:16:46,812 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324758794] [2022-03-20 18:16:46,812 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:16:46,812 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-03-20 18:16:46,812 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:46,813 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-03-20 18:16:46,813 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=3421, Unknown=0, NotChecked=0, Total=3540 [2022-03-20 18:16:46,814 INFO L87 Difference]: Start difference. First operand 70 states and 71 transitions. Second operand has 59 states, 59 states have (on average 1.0508474576271187) internal successors, (62), 58 states have internal predecessors, (62), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:16:50,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:16:50,859 INFO L93 Difference]: Finished difference Result 81 states and 83 transitions. [2022-03-20 18:16:50,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-03-20 18:16:50,859 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.0508474576271187) internal successors, (62), 58 states have internal predecessors, (62), 2 states have call successors, (3), 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 66 [2022-03-20 18:16:50,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:16:50,860 INFO L225 Difference]: With dead ends: 81 [2022-03-20 18:16:50,860 INFO L226 Difference]: Without dead ends: 71 [2022-03-20 18:16:50,861 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1595 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=336, Invalid=12546, Unknown=0, NotChecked=0, Total=12882 [2022-03-20 18:16:50,861 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 3699 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 297 SdHoareTripleChecker+Invalid, 3755 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 3699 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:16:50,861 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 297 Invalid, 3755 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 3699 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2022-03-20 18:16:50,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-03-20 18:16:50,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2022-03-20 18:16:50,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 65 states have (on average 1.0307692307692307) internal successors, (67), 65 states have internal predecessors, (67), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:16:50,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2022-03-20 18:16:50,864 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 66 [2022-03-20 18:16:50,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:16:50,865 INFO L478 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2022-03-20 18:16:50,865 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.0508474576271187) internal successors, (62), 58 states have internal predecessors, (62), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:16:50,865 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2022-03-20 18:16:50,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-03-20 18:16:50,865 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:16:50,865 INFO L499 BasicCegarLoop]: trace histogram [54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:16:50,865 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2022-03-20 18:16:50,865 INFO L403 AbstractCegarLoop]: === Iteration 55 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:16:50,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:16:50,865 INFO L85 PathProgramCache]: Analyzing trace with hash 1415348135, now seen corresponding path program 54 times [2022-03-20 18:16:50,866 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:50,866 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1590238841] [2022-03-20 18:16:51,013 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:16:51,013 INFO L85 PathProgramCache]: Analyzing trace with hash -1161237298, now seen corresponding path program 1 times [2022-03-20 18:16:51,013 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:16:51,013 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1186567961] [2022-03-20 18:16:51,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:16:51,013 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:16:51,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:51,050 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:16:51,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:51,054 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:16:51,055 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:16:51,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1186567961] [2022-03-20 18:16:51,055 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1186567961] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:51,055 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:51,055 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:16:52,423 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:16:52,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1590238841] [2022-03-20 18:16:52,423 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1590238841] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:52,423 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:52,423 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [60] imperfect sequences [] total 60 [2022-03-20 18:16:52,424 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256023494] [2022-03-20 18:16:52,424 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:16:52,424 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-03-20 18:16:52,424 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:52,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-03-20 18:16:52,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=3539, Unknown=0, NotChecked=0, Total=3660 [2022-03-20 18:16:52,425 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand has 60 states, 60 states have (on average 1.05) internal successors, (63), 59 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:16:56,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:16:56,393 INFO L93 Difference]: Finished difference Result 82 states and 84 transitions. [2022-03-20 18:16:56,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2022-03-20 18:16:56,394 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 1.05) internal successors, (63), 59 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2022-03-20 18:16:56,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:16:56,394 INFO L225 Difference]: With dead ends: 82 [2022-03-20 18:16:56,394 INFO L226 Difference]: Without dead ends: 72 [2022-03-20 18:16:56,395 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1652 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=342, Invalid=12998, Unknown=0, NotChecked=0, Total=13340 [2022-03-20 18:16:56,395 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 287 mSDsCounter, 0 mSdLazyCounter, 3822 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 302 SdHoareTripleChecker+Invalid, 3879 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 3822 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:16:56,396 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 302 Invalid, 3879 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 3822 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-03-20 18:16:56,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-03-20 18:16:56,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2022-03-20 18:16:56,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:16:56,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2022-03-20 18:16:56,400 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 67 [2022-03-20 18:16:56,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:16:56,401 INFO L478 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2022-03-20 18:16:56,401 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 1.05) internal successors, (63), 59 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:16:56,401 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2022-03-20 18:16:56,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-03-20 18:16:56,401 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:16:56,401 INFO L499 BasicCegarLoop]: trace histogram [55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:16:56,401 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2022-03-20 18:16:56,402 INFO L403 AbstractCegarLoop]: === Iteration 56 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:16:56,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:16:56,402 INFO L85 PathProgramCache]: Analyzing trace with hash -1192784243, now seen corresponding path program 55 times [2022-03-20 18:16:56,402 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:56,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [132006472] [2022-03-20 18:16:56,564 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:16:56,564 INFO L85 PathProgramCache]: Analyzing trace with hash -195576562, now seen corresponding path program 1 times [2022-03-20 18:16:56,564 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:16:56,564 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [479225751] [2022-03-20 18:16:56,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:16:56,565 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:16:56,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:56,595 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:16:56,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:16:56,608 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:16:56,608 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:16:56,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [479225751] [2022-03-20 18:16:56,608 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [479225751] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:56,608 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:56,609 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:16:58,067 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:16:58,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [132006472] [2022-03-20 18:16:58,068 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [132006472] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:16:58,068 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:16:58,068 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [61] imperfect sequences [] total 61 [2022-03-20 18:16:58,068 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632318414] [2022-03-20 18:16:58,068 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:16:58,069 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-03-20 18:16:58,069 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:16:58,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-03-20 18:16:58,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=3659, Unknown=0, NotChecked=0, Total=3782 [2022-03-20 18:16:58,070 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand has 61 states, 61 states have (on average 1.0491803278688525) internal successors, (64), 60 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) [2022-03-20 18:17:02,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:17:02,168 INFO L93 Difference]: Finished difference Result 83 states and 85 transitions. [2022-03-20 18:17:02,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-03-20 18:17:02,169 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.0491803278688525) internal successors, (64), 60 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 [2022-03-20 18:17:02,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:17:02,170 INFO L225 Difference]: With dead ends: 83 [2022-03-20 18:17:02,170 INFO L226 Difference]: Without dead ends: 73 [2022-03-20 18:17:02,172 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1710 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=348, Invalid=13458, Unknown=0, NotChecked=0, Total=13806 [2022-03-20 18:17:02,172 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 3947 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 307 SdHoareTripleChecker+Invalid, 4005 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 3947 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:17:02,172 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 307 Invalid, 4005 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 3947 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2022-03-20 18:17:02,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-03-20 18:17:02,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2022-03-20 18:17:02,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 67 states have internal predecessors, (69), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:17:02,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 74 transitions. [2022-03-20 18:17:02,177 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 74 transitions. Word has length 68 [2022-03-20 18:17:02,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:17:02,178 INFO L478 AbstractCegarLoop]: Abstraction has 73 states and 74 transitions. [2022-03-20 18:17:02,178 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 1.0491803278688525) internal successors, (64), 60 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) [2022-03-20 18:17:02,178 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 74 transitions. [2022-03-20 18:17:02,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-03-20 18:17:02,178 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:17:02,178 INFO L499 BasicCegarLoop]: trace histogram [56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:17:02,178 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2022-03-20 18:17:02,178 INFO L403 AbstractCegarLoop]: === Iteration 57 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:17:02,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:17:02,179 INFO L85 PathProgramCache]: Analyzing trace with hash -440509337, now seen corresponding path program 56 times [2022-03-20 18:17:02,180 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:17:02,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [413896975] [2022-03-20 18:17:02,332 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:17:02,332 INFO L85 PathProgramCache]: Analyzing trace with hash 770084174, now seen corresponding path program 1 times [2022-03-20 18:17:02,332 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:17:02,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [526557125] [2022-03-20 18:17:02,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:17:02,333 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:17:02,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:17:02,361 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:17:02,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:17:02,363 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:17:02,363 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:17:02,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [526557125] [2022-03-20 18:17:02,363 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [526557125] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:17:02,364 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:17:02,364 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:17:03,869 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:17:03,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [413896975] [2022-03-20 18:17:03,869 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [413896975] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:17:03,869 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:17:03,869 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [62] imperfect sequences [] total 62 [2022-03-20 18:17:03,869 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609251087] [2022-03-20 18:17:03,870 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:17:03,870 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2022-03-20 18:17:03,870 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:17:03,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2022-03-20 18:17:03,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=3781, Unknown=0, NotChecked=0, Total=3906 [2022-03-20 18:17:03,870 INFO L87 Difference]: Start difference. First operand 73 states and 74 transitions. Second operand has 62 states, 62 states have (on average 1.0483870967741935) internal successors, (65), 61 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:17:08,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:17:08,582 INFO L93 Difference]: Finished difference Result 84 states and 86 transitions. [2022-03-20 18:17:08,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-03-20 18:17:08,583 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.0483870967741935) internal successors, (65), 61 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 69 [2022-03-20 18:17:08,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:17:08,583 INFO L225 Difference]: With dead ends: 84 [2022-03-20 18:17:08,583 INFO L226 Difference]: Without dead ends: 74 [2022-03-20 18:17:08,585 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1769 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=354, Invalid=13926, Unknown=0, NotChecked=0, Total=14280 [2022-03-20 18:17:08,587 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 297 mSDsCounter, 0 mSdLazyCounter, 4074 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 312 SdHoareTripleChecker+Invalid, 4133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 4074 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:17:08,587 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 312 Invalid, 4133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 4074 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2022-03-20 18:17:08,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-03-20 18:17:08,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2022-03-20 18:17:08,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 68 states have (on average 1.0294117647058822) internal successors, (70), 68 states have internal predecessors, (70), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:17:08,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 75 transitions. [2022-03-20 18:17:08,591 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 75 transitions. Word has length 69 [2022-03-20 18:17:08,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:17:08,591 INFO L478 AbstractCegarLoop]: Abstraction has 74 states and 75 transitions. [2022-03-20 18:17:08,591 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 1.0483870967741935) internal successors, (65), 61 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:17:08,591 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 75 transitions. [2022-03-20 18:17:08,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-03-20 18:17:08,592 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:17:08,592 INFO L499 BasicCegarLoop]: trace histogram [57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:17:08,592 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2022-03-20 18:17:08,592 INFO L403 AbstractCegarLoop]: === Iteration 58 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:17:08,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:17:08,593 INFO L85 PathProgramCache]: Analyzing trace with hash 1405176269, now seen corresponding path program 57 times [2022-03-20 18:17:08,593 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:17:08,593 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [262137648] [2022-03-20 18:17:08,732 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:17:08,732 INFO L85 PathProgramCache]: Analyzing trace with hash 1735744910, now seen corresponding path program 1 times [2022-03-20 18:17:08,732 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:17:08,732 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80010966] [2022-03-20 18:17:08,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:17:08,732 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:17:08,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:17:08,764 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:17:08,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:17:08,766 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:17:08,766 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:17:08,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80010966] [2022-03-20 18:17:08,766 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [80010966] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:17:08,766 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:17:08,766 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:17:10,318 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:17:10,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [262137648] [2022-03-20 18:17:10,318 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [262137648] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:17:10,318 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:17:10,319 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [63] imperfect sequences [] total 63 [2022-03-20 18:17:10,319 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824849125] [2022-03-20 18:17:10,319 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:17:10,319 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-03-20 18:17:10,319 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:17:10,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-03-20 18:17:10,320 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=3905, Unknown=0, NotChecked=0, Total=4032 [2022-03-20 18:17:10,320 INFO L87 Difference]: Start difference. First operand 74 states and 75 transitions. Second operand has 63 states, 63 states have (on average 1.0476190476190477) internal successors, (66), 62 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:17:14,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:17:14,852 INFO L93 Difference]: Finished difference Result 85 states and 87 transitions. [2022-03-20 18:17:14,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2022-03-20 18:17:14,853 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.0476190476190477) internal successors, (66), 62 states have internal predecessors, (66), 2 states have call successors, (3), 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 70 [2022-03-20 18:17:14,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:17:14,853 INFO L225 Difference]: With dead ends: 85 [2022-03-20 18:17:14,853 INFO L226 Difference]: Without dead ends: 75 [2022-03-20 18:17:14,855 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1829 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=360, Invalid=14402, Unknown=0, NotChecked=0, Total=14762 [2022-03-20 18:17:14,855 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 302 mSDsCounter, 0 mSdLazyCounter, 4203 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 317 SdHoareTripleChecker+Invalid, 4263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 4203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:17:14,855 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 317 Invalid, 4263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 4203 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2022-03-20 18:17:14,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-03-20 18:17:14,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2022-03-20 18:17:14,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 69 states have (on average 1.0289855072463767) internal successors, (71), 69 states have internal predecessors, (71), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:17:14,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2022-03-20 18:17:14,860 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 70 [2022-03-20 18:17:14,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:17:14,860 INFO L478 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2022-03-20 18:17:14,860 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 1.0476190476190477) internal successors, (66), 62 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:17:14,860 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2022-03-20 18:17:14,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-03-20 18:17:14,861 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:17:14,861 INFO L499 BasicCegarLoop]: trace histogram [58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:17:14,861 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2022-03-20 18:17:14,861 INFO L403 AbstractCegarLoop]: === Iteration 59 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:17:14,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:17:14,861 INFO L85 PathProgramCache]: Analyzing trace with hash -1508112089, now seen corresponding path program 58 times [2022-03-20 18:17:14,861 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:17:14,862 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [824580161] [2022-03-20 18:17:14,963 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:17:14,964 INFO L85 PathProgramCache]: Analyzing trace with hash -1593561650, now seen corresponding path program 1 times [2022-03-20 18:17:14,964 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:17:14,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1037855690] [2022-03-20 18:17:14,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:17:14,964 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:17:14,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:17:14,991 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:17:14,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:17:15,005 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:17:15,005 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:17:15,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1037855690] [2022-03-20 18:17:15,005 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1037855690] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:17:15,005 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:17:15,005 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:17:16,622 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:17:16,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [824580161] [2022-03-20 18:17:16,623 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [824580161] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:17:16,623 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:17:16,623 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [64] imperfect sequences [] total 64 [2022-03-20 18:17:16,623 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [549540875] [2022-03-20 18:17:16,623 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:17:16,623 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-03-20 18:17:16,623 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:17:16,623 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-03-20 18:17:16,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=4031, Unknown=0, NotChecked=0, Total=4160 [2022-03-20 18:17:16,624 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand has 64 states, 64 states have (on average 1.046875) internal successors, (67), 63 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:17:21,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:17:21,701 INFO L93 Difference]: Finished difference Result 86 states and 88 transitions. [2022-03-20 18:17:21,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-03-20 18:17:21,702 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 1.046875) internal successors, (67), 63 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 71 [2022-03-20 18:17:21,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:17:21,703 INFO L225 Difference]: With dead ends: 86 [2022-03-20 18:17:21,703 INFO L226 Difference]: Without dead ends: 76 [2022-03-20 18:17:21,704 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1890 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=366, Invalid=14886, Unknown=0, NotChecked=0, Total=15252 [2022-03-20 18:17:21,704 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 307 mSDsCounter, 0 mSdLazyCounter, 4334 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 322 SdHoareTripleChecker+Invalid, 4395 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 4334 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:17:21,704 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 322 Invalid, 4395 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 4334 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2022-03-20 18:17:21,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-03-20 18:17:21,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2022-03-20 18:17:21,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 70 states have internal predecessors, (72), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:17:21,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 77 transitions. [2022-03-20 18:17:21,711 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 77 transitions. Word has length 71 [2022-03-20 18:17:21,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:17:21,712 INFO L478 AbstractCegarLoop]: Abstraction has 76 states and 77 transitions. [2022-03-20 18:17:21,712 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 1.046875) internal successors, (67), 63 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:17:21,712 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 77 transitions. [2022-03-20 18:17:21,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2022-03-20 18:17:21,713 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:17:21,713 INFO L499 BasicCegarLoop]: trace histogram [59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:17:21,713 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2022-03-20 18:17:21,713 INFO L403 AbstractCegarLoop]: === Iteration 60 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:17:21,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:17:21,713 INFO L85 PathProgramCache]: Analyzing trace with hash -1625737971, now seen corresponding path program 59 times [2022-03-20 18:17:21,713 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:17:21,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1317755258] [2022-03-20 18:17:21,876 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:17:21,877 INFO L85 PathProgramCache]: Analyzing trace with hash -627900914, now seen corresponding path program 1 times [2022-03-20 18:17:21,877 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:17:21,877 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1575518854] [2022-03-20 18:17:21,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:17:21,877 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:17:21,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:17:21,915 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:17:21,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:17:21,918 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:17:21,918 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:17:21,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1575518854] [2022-03-20 18:17:21,919 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1575518854] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:17:21,919 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:17:21,919 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:17:23,589 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:17:23,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1317755258] [2022-03-20 18:17:23,589 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1317755258] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:17:23,589 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:17:23,589 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [65] imperfect sequences [] total 65 [2022-03-20 18:17:23,589 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070622891] [2022-03-20 18:17:23,589 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:17:23,590 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-03-20 18:17:23,590 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:17:23,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-03-20 18:17:23,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=4159, Unknown=0, NotChecked=0, Total=4290 [2022-03-20 18:17:23,590 INFO L87 Difference]: Start difference. First operand 76 states and 77 transitions. Second operand has 65 states, 65 states have (on average 1.0461538461538462) internal successors, (68), 64 states have internal predecessors, (68), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:17:28,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:17:28,627 INFO L93 Difference]: Finished difference Result 87 states and 89 transitions. [2022-03-20 18:17:28,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-03-20 18:17:28,627 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.0461538461538462) internal successors, (68), 64 states have internal predecessors, (68), 2 states have call successors, (3), 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 72 [2022-03-20 18:17:28,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:17:28,628 INFO L225 Difference]: With dead ends: 87 [2022-03-20 18:17:28,628 INFO L226 Difference]: Without dead ends: 77 [2022-03-20 18:17:28,629 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1952 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=372, Invalid=15378, Unknown=0, NotChecked=0, Total=15750 [2022-03-20 18:17:28,630 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 312 mSDsCounter, 0 mSdLazyCounter, 4467 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 327 SdHoareTripleChecker+Invalid, 4529 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 4467 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:17:28,630 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 327 Invalid, 4529 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 4467 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2022-03-20 18:17:28,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-03-20 18:17:28,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2022-03-20 18:17:28,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 71 states have (on average 1.028169014084507) internal successors, (73), 71 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:17:28,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 78 transitions. [2022-03-20 18:17:28,634 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 78 transitions. Word has length 72 [2022-03-20 18:17:28,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:17:28,634 INFO L478 AbstractCegarLoop]: Abstraction has 77 states and 78 transitions. [2022-03-20 18:17:28,635 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 1.0461538461538462) internal successors, (68), 64 states have internal predecessors, (68), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:17:28,635 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 78 transitions. [2022-03-20 18:17:28,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-03-20 18:17:28,635 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:17:28,635 INFO L499 BasicCegarLoop]: trace histogram [60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:17:28,635 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2022-03-20 18:17:28,635 INFO L403 AbstractCegarLoop]: === Iteration 61 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:17:28,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:17:28,635 INFO L85 PathProgramCache]: Analyzing trace with hash -977173017, now seen corresponding path program 60 times [2022-03-20 18:17:28,635 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:17:28,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1353670910] [2022-03-20 18:17:28,738 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:17:28,738 INFO L85 PathProgramCache]: Analyzing trace with hash 337759822, now seen corresponding path program 1 times [2022-03-20 18:17:28,738 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:17:28,738 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [603055024] [2022-03-20 18:17:28,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:17:28,739 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:17:28,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:17:28,775 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:17:28,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:17:28,777 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:17:28,777 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:17:28,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [603055024] [2022-03-20 18:17:28,778 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [603055024] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:17:28,778 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:17:28,778 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:17:30,471 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:17:30,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1353670910] [2022-03-20 18:17:30,471 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1353670910] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:17:30,471 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:17:30,471 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [66] imperfect sequences [] total 66 [2022-03-20 18:17:30,471 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315219362] [2022-03-20 18:17:30,471 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:17:30,471 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2022-03-20 18:17:30,471 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:17:30,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2022-03-20 18:17:30,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=4289, Unknown=0, NotChecked=0, Total=4422 [2022-03-20 18:17:30,472 INFO L87 Difference]: Start difference. First operand 77 states and 78 transitions. Second operand has 66 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 65 states have internal predecessors, (69), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:17:36,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:17:36,443 INFO L93 Difference]: Finished difference Result 88 states and 90 transitions. [2022-03-20 18:17:36,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-03-20 18:17:36,444 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 65 states have internal predecessors, (69), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 73 [2022-03-20 18:17:36,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:17:36,444 INFO L225 Difference]: With dead ends: 88 [2022-03-20 18:17:36,444 INFO L226 Difference]: Without dead ends: 78 [2022-03-20 18:17:36,445 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2015 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=378, Invalid=15878, Unknown=0, NotChecked=0, Total=16256 [2022-03-20 18:17:36,445 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 317 mSDsCounter, 0 mSdLazyCounter, 4602 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 332 SdHoareTripleChecker+Invalid, 4665 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 4602 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:17:36,445 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 332 Invalid, 4665 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 4602 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2022-03-20 18:17:36,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-03-20 18:17:36,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2022-03-20 18:17:36,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 72 states have (on average 1.0277777777777777) internal successors, (74), 72 states have internal predecessors, (74), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:17:36,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2022-03-20 18:17:36,449 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 73 [2022-03-20 18:17:36,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:17:36,449 INFO L478 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2022-03-20 18:17:36,449 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 65 states have internal predecessors, (69), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:17:36,449 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2022-03-20 18:17:36,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-03-20 18:17:36,449 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:17:36,449 INFO L499 BasicCegarLoop]: trace histogram [61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:17:36,449 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2022-03-20 18:17:36,449 INFO L403 AbstractCegarLoop]: === Iteration 62 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:17:36,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:17:36,450 INFO L85 PathProgramCache]: Analyzing trace with hash 1948471373, now seen corresponding path program 61 times [2022-03-20 18:17:36,450 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:17:36,450 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1444598881] [2022-03-20 18:17:36,593 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:17:36,593 INFO L85 PathProgramCache]: Analyzing trace with hash 1303420558, now seen corresponding path program 1 times [2022-03-20 18:17:36,593 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:17:36,593 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [740567126] [2022-03-20 18:17:36,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:17:36,593 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:17:36,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:17:36,630 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:17:36,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:17:36,633 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:17:36,633 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:17:36,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [740567126] [2022-03-20 18:17:36,633 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [740567126] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:17:36,634 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:17:36,634 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:17:38,379 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:17:38,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1444598881] [2022-03-20 18:17:38,379 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1444598881] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:17:38,379 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:17:38,379 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [67] imperfect sequences [] total 67 [2022-03-20 18:17:38,383 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1362940047] [2022-03-20 18:17:38,383 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:17:38,383 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-03-20 18:17:38,383 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:17:38,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-03-20 18:17:38,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=4421, Unknown=0, NotChecked=0, Total=4556 [2022-03-20 18:17:38,384 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand has 67 states, 67 states have (on average 1.044776119402985) internal successors, (70), 66 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) [2022-03-20 18:17:44,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:17:44,684 INFO L93 Difference]: Finished difference Result 89 states and 91 transitions. [2022-03-20 18:17:44,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2022-03-20 18:17:44,685 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 1.044776119402985) internal successors, (70), 66 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 [2022-03-20 18:17:44,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:17:44,685 INFO L225 Difference]: With dead ends: 89 [2022-03-20 18:17:44,685 INFO L226 Difference]: Without dead ends: 79 [2022-03-20 18:17:44,687 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2079 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=384, Invalid=16386, Unknown=0, NotChecked=0, Total=16770 [2022-03-20 18:17:44,687 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 322 mSDsCounter, 0 mSdLazyCounter, 4739 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 337 SdHoareTripleChecker+Invalid, 4803 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 4739 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:17:44,687 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 337 Invalid, 4803 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 4739 Invalid, 0 Unknown, 0 Unchecked, 4.4s Time] [2022-03-20 18:17:44,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-03-20 18:17:44,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2022-03-20 18:17:44,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 73 states have (on average 1.0273972602739727) internal successors, (75), 73 states have internal predecessors, (75), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:17:44,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2022-03-20 18:17:44,692 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 74 [2022-03-20 18:17:44,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:17:44,693 INFO L478 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2022-03-20 18:17:44,693 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 1.044776119402985) internal successors, (70), 66 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) [2022-03-20 18:17:44,693 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2022-03-20 18:17:44,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-03-20 18:17:44,693 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:17:44,693 INFO L499 BasicCegarLoop]: trace histogram [62, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:17:44,693 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2022-03-20 18:17:44,693 INFO L403 AbstractCegarLoop]: === Iteration 63 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:17:44,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:17:44,694 INFO L85 PathProgramCache]: Analyzing trace with hash -1845833049, now seen corresponding path program 62 times [2022-03-20 18:17:44,694 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:17:44,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1806496025] [2022-03-20 18:17:44,830 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:17:44,830 INFO L85 PathProgramCache]: Analyzing trace with hash -2025886002, now seen corresponding path program 1 times [2022-03-20 18:17:44,830 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:17:44,830 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [227604716] [2022-03-20 18:17:44,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:17:44,830 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:17:44,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:17:44,863 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:17:44,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:17:44,865 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:17:44,865 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:17:44,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [227604716] [2022-03-20 18:17:44,866 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [227604716] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:17:44,866 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:17:44,866 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:17:46,727 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:17:46,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1806496025] [2022-03-20 18:17:46,728 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1806496025] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:17:46,728 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:17:46,728 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [68] imperfect sequences [] total 68 [2022-03-20 18:17:46,728 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907176683] [2022-03-20 18:17:46,728 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:17:46,728 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2022-03-20 18:17:46,728 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:17:46,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2022-03-20 18:17:46,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=4555, Unknown=0, NotChecked=0, Total=4692 [2022-03-20 18:17:46,729 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand has 68 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 67 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:17:53,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:17:53,053 INFO L93 Difference]: Finished difference Result 90 states and 92 transitions. [2022-03-20 18:17:53,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-03-20 18:17:53,053 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 67 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 75 [2022-03-20 18:17:53,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:17:53,054 INFO L225 Difference]: With dead ends: 90 [2022-03-20 18:17:53,054 INFO L226 Difference]: Without dead ends: 80 [2022-03-20 18:17:53,055 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2144 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=390, Invalid=16902, Unknown=0, NotChecked=0, Total=17292 [2022-03-20 18:17:53,055 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 327 mSDsCounter, 0 mSdLazyCounter, 4878 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 342 SdHoareTripleChecker+Invalid, 4943 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 4878 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:17:53,055 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 342 Invalid, 4943 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 4878 Invalid, 0 Unknown, 0 Unchecked, 4.4s Time] [2022-03-20 18:17:53,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-03-20 18:17:53,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2022-03-20 18:17:53,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 74 states have (on average 1.027027027027027) internal successors, (76), 74 states have internal predecessors, (76), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:17:53,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2022-03-20 18:17:53,061 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 75 [2022-03-20 18:17:53,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:17:53,061 INFO L478 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2022-03-20 18:17:53,061 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 67 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:17:53,061 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2022-03-20 18:17:53,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-03-20 18:17:53,062 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:17:53,062 INFO L499 BasicCegarLoop]: trace histogram [63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:17:53,062 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2022-03-20 18:17:53,062 INFO L403 AbstractCegarLoop]: === Iteration 64 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:17:53,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:17:53,062 INFO L85 PathProgramCache]: Analyzing trace with hash 789814157, now seen corresponding path program 63 times [2022-03-20 18:17:53,062 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:17:53,062 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1661330822] [2022-03-20 18:17:53,213 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:17:53,213 INFO L85 PathProgramCache]: Analyzing trace with hash -1060225266, now seen corresponding path program 1 times [2022-03-20 18:17:53,214 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:17:53,214 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [821785741] [2022-03-20 18:17:53,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:17:53,214 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:17:53,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:17:53,242 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:17:53,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:17:53,245 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:17:53,245 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:17:53,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [821785741] [2022-03-20 18:17:53,245 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [821785741] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:17:53,245 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:17:53,246 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:17:55,158 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:17:55,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1661330822] [2022-03-20 18:17:55,159 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1661330822] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:17:55,159 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:17:55,159 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [69] imperfect sequences [] total 69 [2022-03-20 18:17:55,159 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656651791] [2022-03-20 18:17:55,159 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:17:55,159 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2022-03-20 18:17:55,159 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:17:55,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2022-03-20 18:17:55,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=4691, Unknown=0, NotChecked=0, Total=4830 [2022-03-20 18:17:55,160 INFO L87 Difference]: Start difference. First operand 80 states and 81 transitions. Second operand has 69 states, 69 states have (on average 1.0434782608695652) internal successors, (72), 68 states have internal predecessors, (72), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:18:01,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:18:01,764 INFO L93 Difference]: Finished difference Result 91 states and 93 transitions. [2022-03-20 18:18:01,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2022-03-20 18:18:01,765 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 1.0434782608695652) internal successors, (72), 68 states have internal predecessors, (72), 2 states have call successors, (3), 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 76 [2022-03-20 18:18:01,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:18:01,766 INFO L225 Difference]: With dead ends: 91 [2022-03-20 18:18:01,766 INFO L226 Difference]: Without dead ends: 81 [2022-03-20 18:18:01,767 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2210 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=396, Invalid=17426, Unknown=0, NotChecked=0, Total=17822 [2022-03-20 18:18:01,767 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 332 mSDsCounter, 0 mSdLazyCounter, 5019 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 347 SdHoareTripleChecker+Invalid, 5085 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 5019 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:18:01,767 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 347 Invalid, 5085 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 5019 Invalid, 0 Unknown, 0 Unchecked, 4.6s Time] [2022-03-20 18:18:01,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-03-20 18:18:01,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2022-03-20 18:18:01,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 75 states have (on average 1.0266666666666666) internal successors, (77), 75 states have internal predecessors, (77), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:18:01,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 82 transitions. [2022-03-20 18:18:01,776 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 82 transitions. Word has length 76 [2022-03-20 18:18:01,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:18:01,776 INFO L478 AbstractCegarLoop]: Abstraction has 81 states and 82 transitions. [2022-03-20 18:18:01,776 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 1.0434782608695652) internal successors, (72), 68 states have internal predecessors, (72), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:18:01,776 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 82 transitions. [2022-03-20 18:18:01,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-03-20 18:18:01,777 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:18:01,777 INFO L499 BasicCegarLoop]: trace histogram [64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:18:01,777 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63 [2022-03-20 18:18:01,777 INFO L403 AbstractCegarLoop]: === Iteration 65 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:18:01,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:18:01,777 INFO L85 PathProgramCache]: Analyzing trace with hash 890498919, now seen corresponding path program 64 times [2022-03-20 18:18:01,778 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:18:01,778 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [364908535] [2022-03-20 18:18:01,884 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:18:01,884 INFO L85 PathProgramCache]: Analyzing trace with hash -94564530, now seen corresponding path program 1 times [2022-03-20 18:18:01,884 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:18:01,884 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1727891084] [2022-03-20 18:18:01,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:18:01,884 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:18:01,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:18:01,925 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:18:01,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:18:01,928 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:18:01,928 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:18:01,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1727891084] [2022-03-20 18:18:01,928 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1727891084] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:18:01,928 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:18:01,928 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:18:03,839 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:18:03,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [364908535] [2022-03-20 18:18:03,839 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [364908535] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:18:03,839 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:18:03,839 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [70] imperfect sequences [] total 70 [2022-03-20 18:18:03,840 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1689186475] [2022-03-20 18:18:03,840 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:18:03,840 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-03-20 18:18:03,840 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:18:03,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-03-20 18:18:03,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=4829, Unknown=0, NotChecked=0, Total=4970 [2022-03-20 18:18:03,841 INFO L87 Difference]: Start difference. First operand 81 states and 82 transitions. Second operand has 70 states, 70 states have (on average 1.042857142857143) internal successors, (73), 69 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:18:11,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:18:11,757 INFO L93 Difference]: Finished difference Result 92 states and 94 transitions. [2022-03-20 18:18:11,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-03-20 18:18:11,758 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 1.042857142857143) internal successors, (73), 69 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2022-03-20 18:18:11,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:18:11,759 INFO L225 Difference]: With dead ends: 92 [2022-03-20 18:18:11,759 INFO L226 Difference]: Without dead ends: 82 [2022-03-20 18:18:11,760 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2277 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=402, Invalid=17958, Unknown=0, NotChecked=0, Total=18360 [2022-03-20 18:18:11,763 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 337 mSDsCounter, 0 mSdLazyCounter, 5162 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 352 SdHoareTripleChecker+Invalid, 5229 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 5162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:18:11,763 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 352 Invalid, 5229 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 5162 Invalid, 0 Unknown, 0 Unchecked, 5.9s Time] [2022-03-20 18:18:11,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-03-20 18:18:11,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2022-03-20 18:18:11,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 76 states have (on average 1.0263157894736843) internal successors, (78), 76 states have internal predecessors, (78), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:18:11,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2022-03-20 18:18:11,769 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 77 [2022-03-20 18:18:11,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:18:11,769 INFO L478 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2022-03-20 18:18:11,769 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 1.042857142857143) internal successors, (73), 69 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:18:11,769 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2022-03-20 18:18:11,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-03-20 18:18:11,770 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:18:11,770 INFO L499 BasicCegarLoop]: trace histogram [65, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:18:11,770 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64 [2022-03-20 18:18:11,770 INFO L403 AbstractCegarLoop]: === Iteration 66 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:18:11,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:18:11,770 INFO L85 PathProgramCache]: Analyzing trace with hash -283240755, now seen corresponding path program 65 times [2022-03-20 18:18:11,770 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:18:11,771 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [295752755] [2022-03-20 18:18:11,900 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:18:11,900 INFO L85 PathProgramCache]: Analyzing trace with hash 871096206, now seen corresponding path program 1 times [2022-03-20 18:18:11,900 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:18:11,900 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [719039433] [2022-03-20 18:18:11,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:18:11,900 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:18:11,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:18:11,935 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:18:11,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:18:11,937 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:18:11,937 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:18:11,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [719039433] [2022-03-20 18:18:11,937 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [719039433] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:18:11,938 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:18:11,938 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:18:14,044 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:18:14,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [295752755] [2022-03-20 18:18:14,045 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [295752755] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:18:14,045 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:18:14,045 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [71] imperfect sequences [] total 71 [2022-03-20 18:18:14,045 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083307822] [2022-03-20 18:18:14,045 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:18:14,045 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2022-03-20 18:18:14,045 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:18:14,045 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2022-03-20 18:18:14,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=4969, Unknown=0, NotChecked=0, Total=5112 [2022-03-20 18:18:14,046 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand has 71 states, 71 states have (on average 1.0422535211267605) internal successors, (74), 70 states have internal predecessors, (74), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:18:21,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:18:21,986 INFO L93 Difference]: Finished difference Result 93 states and 95 transitions. [2022-03-20 18:18:21,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-03-20 18:18:21,986 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 1.0422535211267605) internal successors, (74), 70 states have internal predecessors, (74), 2 states have call successors, (3), 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 78 [2022-03-20 18:18:21,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:18:21,987 INFO L225 Difference]: With dead ends: 93 [2022-03-20 18:18:21,987 INFO L226 Difference]: Without dead ends: 83 [2022-03-20 18:18:21,989 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2345 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=408, Invalid=18498, Unknown=0, NotChecked=0, Total=18906 [2022-03-20 18:18:21,989 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 342 mSDsCounter, 0 mSdLazyCounter, 5307 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 357 SdHoareTripleChecker+Invalid, 5375 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 5307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:18:21,989 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 357 Invalid, 5375 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 5307 Invalid, 0 Unknown, 0 Unchecked, 5.9s Time] [2022-03-20 18:18:21,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-03-20 18:18:21,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2022-03-20 18:18:21,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 77 states have (on average 1.025974025974026) internal successors, (79), 77 states have internal predecessors, (79), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:18:21,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2022-03-20 18:18:21,995 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 78 [2022-03-20 18:18:21,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:18:21,995 INFO L478 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2022-03-20 18:18:21,995 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 1.0422535211267605) internal successors, (74), 70 states have internal predecessors, (74), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:18:21,995 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2022-03-20 18:18:21,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-03-20 18:18:21,996 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:18:21,996 INFO L499 BasicCegarLoop]: trace histogram [66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:18:21,996 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2022-03-20 18:18:21,996 INFO L403 AbstractCegarLoop]: === Iteration 67 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:18:21,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:18:21,996 INFO L85 PathProgramCache]: Analyzing trace with hash 1985535015, now seen corresponding path program 66 times [2022-03-20 18:18:21,996 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:18:21,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1538295437] [2022-03-20 18:18:22,167 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:18:22,168 INFO L85 PathProgramCache]: Analyzing trace with hash 1836756942, now seen corresponding path program 1 times [2022-03-20 18:18:22,168 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:18:22,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [639773806] [2022-03-20 18:18:22,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:18:22,168 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:18:22,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:18:22,199 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:18:22,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:18:22,201 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:18:22,202 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:18:22,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [639773806] [2022-03-20 18:18:22,202 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [639773806] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:18:22,202 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:18:22,202 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:18:24,324 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:18:24,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1538295437] [2022-03-20 18:18:24,324 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1538295437] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:18:24,324 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:18:24,324 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [72] imperfect sequences [] total 72 [2022-03-20 18:18:24,324 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949900745] [2022-03-20 18:18:24,325 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:18:24,325 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2022-03-20 18:18:24,325 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:18:24,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2022-03-20 18:18:24,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=5111, Unknown=0, NotChecked=0, Total=5256 [2022-03-20 18:18:24,326 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand has 72 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 71 states have internal predecessors, (75), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:18:34,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:18:34,204 INFO L93 Difference]: Finished difference Result 94 states and 96 transitions. [2022-03-20 18:18:34,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-03-20 18:18:34,205 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 71 states have internal predecessors, (75), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 79 [2022-03-20 18:18:34,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:18:34,206 INFO L225 Difference]: With dead ends: 94 [2022-03-20 18:18:34,206 INFO L226 Difference]: Without dead ends: 84 [2022-03-20 18:18:34,207 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2414 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=414, Invalid=19046, Unknown=0, NotChecked=0, Total=19460 [2022-03-20 18:18:34,207 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 347 mSDsCounter, 0 mSdLazyCounter, 5454 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 362 SdHoareTripleChecker+Invalid, 5523 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 5454 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.7s IncrementalHoareTripleChecker+Time [2022-03-20 18:18:34,207 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 362 Invalid, 5523 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 5454 Invalid, 0 Unknown, 0 Unchecked, 7.7s Time] [2022-03-20 18:18:34,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-03-20 18:18:34,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2022-03-20 18:18:34,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 78 states have (on average 1.0256410256410255) internal successors, (80), 78 states have internal predecessors, (80), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:18:34,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 85 transitions. [2022-03-20 18:18:34,211 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 85 transitions. Word has length 79 [2022-03-20 18:18:34,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:18:34,211 INFO L478 AbstractCegarLoop]: Abstraction has 84 states and 85 transitions. [2022-03-20 18:18:34,212 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 71 states have internal predecessors, (75), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:18:34,212 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 85 transitions. [2022-03-20 18:18:34,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-03-20 18:18:34,212 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:18:34,212 INFO L499 BasicCegarLoop]: trace histogram [67, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:18:34,212 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66 [2022-03-20 18:18:34,212 INFO L403 AbstractCegarLoop]: === Iteration 68 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:18:34,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:18:34,212 INFO L85 PathProgramCache]: Analyzing trace with hash -696860147, now seen corresponding path program 67 times [2022-03-20 18:18:34,212 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:18:34,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1592883387] [2022-03-20 18:18:34,354 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:18:34,355 INFO L85 PathProgramCache]: Analyzing trace with hash -1492549618, now seen corresponding path program 1 times [2022-03-20 18:18:34,355 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:18:34,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1088545850] [2022-03-20 18:18:34,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:18:34,355 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:18:34,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:18:34,387 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:18:34,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:18:34,390 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:18:34,390 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:18:34,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1088545850] [2022-03-20 18:18:34,390 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1088545850] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:18:34,390 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:18:34,390 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:18:36,549 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:18:36,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1592883387] [2022-03-20 18:18:36,549 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1592883387] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:18:36,549 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:18:36,549 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [73] imperfect sequences [] total 73 [2022-03-20 18:18:36,549 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814043303] [2022-03-20 18:18:36,549 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:18:36,550 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-03-20 18:18:36,550 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:18:36,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-03-20 18:18:36,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=5255, Unknown=0, NotChecked=0, Total=5402 [2022-03-20 18:18:36,551 INFO L87 Difference]: Start difference. First operand 84 states and 85 transitions. Second operand has 73 states, 73 states have (on average 1.0410958904109588) internal successors, (76), 72 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) [2022-03-20 18:18:45,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:18:45,338 INFO L93 Difference]: Finished difference Result 95 states and 97 transitions. [2022-03-20 18:18:45,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2022-03-20 18:18:45,338 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 1.0410958904109588) internal successors, (76), 72 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 [2022-03-20 18:18:45,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:18:45,339 INFO L225 Difference]: With dead ends: 95 [2022-03-20 18:18:45,339 INFO L226 Difference]: Without dead ends: 85 [2022-03-20 18:18:45,341 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2484 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=420, Invalid=19602, Unknown=0, NotChecked=0, Total=20022 [2022-03-20 18:18:45,341 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 352 mSDsCounter, 0 mSdLazyCounter, 5603 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 367 SdHoareTripleChecker+Invalid, 5673 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 5603 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:18:45,341 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 367 Invalid, 5673 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 5603 Invalid, 0 Unknown, 0 Unchecked, 6.6s Time] [2022-03-20 18:18:45,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-03-20 18:18:45,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2022-03-20 18:18:45,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 79 states have (on average 1.0253164556962024) internal successors, (81), 79 states have internal predecessors, (81), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:18:45,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 86 transitions. [2022-03-20 18:18:45,345 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 86 transitions. Word has length 80 [2022-03-20 18:18:45,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:18:45,345 INFO L478 AbstractCegarLoop]: Abstraction has 85 states and 86 transitions. [2022-03-20 18:18:45,345 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 1.0410958904109588) internal successors, (76), 72 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) [2022-03-20 18:18:45,345 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 86 transitions. [2022-03-20 18:18:45,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-03-20 18:18:45,346 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:18:45,346 INFO L499 BasicCegarLoop]: trace histogram [68, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:18:45,346 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67 [2022-03-20 18:18:45,346 INFO L403 AbstractCegarLoop]: === Iteration 69 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:18:45,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:18:45,346 INFO L85 PathProgramCache]: Analyzing trace with hash 2048235751, now seen corresponding path program 68 times [2022-03-20 18:18:45,347 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:18:45,347 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [954427092] [2022-03-20 18:18:45,488 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:18:45,489 INFO L85 PathProgramCache]: Analyzing trace with hash -526888882, now seen corresponding path program 1 times [2022-03-20 18:18:45,489 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:18:45,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [292571741] [2022-03-20 18:18:45,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:18:45,489 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:18:45,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:18:45,526 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:18:45,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:18:45,530 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:18:45,530 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:18:45,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [292571741] [2022-03-20 18:18:45,530 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [292571741] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:18:45,530 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:18:45,530 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:18:47,694 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:18:47,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [954427092] [2022-03-20 18:18:47,695 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [954427092] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:18:47,695 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:18:47,695 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [74] imperfect sequences [] total 74 [2022-03-20 18:18:47,695 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129381828] [2022-03-20 18:18:47,695 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:18:47,695 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2022-03-20 18:18:47,695 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:18:47,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2022-03-20 18:18:47,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=5401, Unknown=0, NotChecked=0, Total=5550 [2022-03-20 18:18:47,696 INFO L87 Difference]: Start difference. First operand 85 states and 86 transitions. Second operand has 74 states, 74 states have (on average 1.0405405405405406) internal successors, (77), 73 states have internal predecessors, (77), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:18:58,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:18:58,175 INFO L93 Difference]: Finished difference Result 96 states and 98 transitions. [2022-03-20 18:18:58,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2022-03-20 18:18:58,176 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 1.0405405405405406) internal successors, (77), 73 states have internal predecessors, (77), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 81 [2022-03-20 18:18:58,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:18:58,177 INFO L225 Difference]: With dead ends: 96 [2022-03-20 18:18:58,177 INFO L226 Difference]: Without dead ends: 86 [2022-03-20 18:18:58,178 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2555 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=426, Invalid=20166, Unknown=0, NotChecked=0, Total=20592 [2022-03-20 18:18:58,178 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 357 mSDsCounter, 0 mSdLazyCounter, 5754 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 372 SdHoareTripleChecker+Invalid, 5825 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 5754 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:18:58,179 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 372 Invalid, 5825 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 5754 Invalid, 0 Unknown, 0 Unchecked, 8.2s Time] [2022-03-20 18:18:58,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-03-20 18:18:58,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2022-03-20 18:18:58,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 80 states have (on average 1.025) internal successors, (82), 80 states have internal predecessors, (82), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:18:58,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 87 transitions. [2022-03-20 18:18:58,184 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 87 transitions. Word has length 81 [2022-03-20 18:18:58,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:18:58,185 INFO L478 AbstractCegarLoop]: Abstraction has 86 states and 87 transitions. [2022-03-20 18:18:58,185 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 1.0405405405405406) internal successors, (77), 73 states have internal predecessors, (77), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:18:58,185 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 87 transitions. [2022-03-20 18:18:58,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-03-20 18:18:58,185 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:18:58,185 INFO L499 BasicCegarLoop]: trace histogram [69, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:18:58,185 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68 [2022-03-20 18:18:58,186 INFO L403 AbstractCegarLoop]: === Iteration 70 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:18:58,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:18:58,186 INFO L85 PathProgramCache]: Analyzing trace with hash 1246862669, now seen corresponding path program 69 times [2022-03-20 18:18:58,186 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:18:58,186 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1805322200] [2022-03-20 18:18:58,301 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:18:58,301 INFO L85 PathProgramCache]: Analyzing trace with hash 438771854, now seen corresponding path program 1 times [2022-03-20 18:18:58,301 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:18:58,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1950956297] [2022-03-20 18:18:58,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:18:58,302 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:18:58,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:18:58,327 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:18:58,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:18:58,329 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:18:58,329 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:18:58,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1950956297] [2022-03-20 18:18:58,330 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1950956297] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:18:58,330 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:18:58,330 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:19:00,612 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:19:00,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1805322200] [2022-03-20 18:19:00,613 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1805322200] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:19:00,613 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:19:00,613 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [75] imperfect sequences [] total 75 [2022-03-20 18:19:00,613 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129028076] [2022-03-20 18:19:00,613 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:19:00,613 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2022-03-20 18:19:00,613 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:19:00,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2022-03-20 18:19:00,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=5549, Unknown=0, NotChecked=0, Total=5700 [2022-03-20 18:19:00,614 INFO L87 Difference]: Start difference. First operand 86 states and 87 transitions. Second operand has 75 states, 75 states have (on average 1.04) internal successors, (78), 74 states have internal predecessors, (78), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:19:11,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:19:11,119 INFO L93 Difference]: Finished difference Result 97 states and 99 transitions. [2022-03-20 18:19:11,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2022-03-20 18:19:11,120 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 1.04) internal successors, (78), 74 states have internal predecessors, (78), 2 states have call successors, (3), 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 82 [2022-03-20 18:19:11,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:19:11,121 INFO L225 Difference]: With dead ends: 97 [2022-03-20 18:19:11,121 INFO L226 Difference]: Without dead ends: 87 [2022-03-20 18:19:11,123 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2627 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=432, Invalid=20738, Unknown=0, NotChecked=0, Total=21170 [2022-03-20 18:19:11,123 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 362 mSDsCounter, 0 mSdLazyCounter, 5907 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 377 SdHoareTripleChecker+Invalid, 5979 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 5907 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:19:11,123 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 377 Invalid, 5979 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [72 Valid, 5907 Invalid, 0 Unknown, 0 Unchecked, 8.1s Time] [2022-03-20 18:19:11,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-03-20 18:19:11,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2022-03-20 18:19:11,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 81 states have (on average 1.0246913580246915) internal successors, (83), 81 states have internal predecessors, (83), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:19:11,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2022-03-20 18:19:11,129 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 82 [2022-03-20 18:19:11,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:19:11,129 INFO L478 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2022-03-20 18:19:11,129 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 75 states have (on average 1.04) internal successors, (78), 74 states have internal predecessors, (78), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:19:11,129 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2022-03-20 18:19:11,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-03-20 18:19:11,129 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:19:11,129 INFO L499 BasicCegarLoop]: trace histogram [70, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:19:11,130 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69 [2022-03-20 18:19:11,130 INFO L403 AbstractCegarLoop]: === Iteration 71 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:19:11,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:19:11,130 INFO L85 PathProgramCache]: Analyzing trace with hash -2120866393, now seen corresponding path program 70 times [2022-03-20 18:19:11,130 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:19:11,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [418195388] [2022-03-20 18:19:11,249 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:19:11,249 INFO L85 PathProgramCache]: Analyzing trace with hash 1404432590, now seen corresponding path program 1 times [2022-03-20 18:19:11,250 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:19:11,250 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [812809706] [2022-03-20 18:19:11,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:19:11,250 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:19:11,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:19:11,284 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:19:11,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:19:11,287 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:19:11,287 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:19:11,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [812809706] [2022-03-20 18:19:11,287 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [812809706] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:19:11,287 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:19:11,287 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:19:13,560 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:19:13,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [418195388] [2022-03-20 18:19:13,560 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [418195388] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:19:13,560 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:19:13,561 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [76] imperfect sequences [] total 76 [2022-03-20 18:19:13,561 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559091581] [2022-03-20 18:19:13,561 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:19:13,561 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2022-03-20 18:19:13,561 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:19:13,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2022-03-20 18:19:13,562 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=5699, Unknown=0, NotChecked=0, Total=5852 [2022-03-20 18:19:13,562 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand has 76 states, 76 states have (on average 1.0394736842105263) internal successors, (79), 75 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:19:24,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:19:24,864 INFO L93 Difference]: Finished difference Result 98 states and 100 transitions. [2022-03-20 18:19:24,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-03-20 18:19:24,865 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 1.0394736842105263) internal successors, (79), 75 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2022-03-20 18:19:24,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:19:24,865 INFO L225 Difference]: With dead ends: 98 [2022-03-20 18:19:24,865 INFO L226 Difference]: Without dead ends: 88 [2022-03-20 18:19:24,866 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2700 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=438, Invalid=21318, Unknown=0, NotChecked=0, Total=21756 [2022-03-20 18:19:24,866 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 367 mSDsCounter, 0 mSdLazyCounter, 6062 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 382 SdHoareTripleChecker+Invalid, 6135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 6062 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:19:24,867 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 382 Invalid, 6135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 6062 Invalid, 0 Unknown, 0 Unchecked, 8.9s Time] [2022-03-20 18:19:24,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-03-20 18:19:24,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2022-03-20 18:19:24,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 82 states have (on average 1.024390243902439) internal successors, (84), 82 states have internal predecessors, (84), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:19:24,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2022-03-20 18:19:24,872 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 83 [2022-03-20 18:19:24,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:19:24,872 INFO L478 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2022-03-20 18:19:24,872 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 76 states have (on average 1.0394736842105263) internal successors, (79), 75 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:19:24,872 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2022-03-20 18:19:24,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-03-20 18:19:24,873 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:19:24,873 INFO L499 BasicCegarLoop]: trace histogram [71, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:19:24,873 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70 [2022-03-20 18:19:24,873 INFO L403 AbstractCegarLoop]: === Iteration 72 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:19:24,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:19:24,873 INFO L85 PathProgramCache]: Analyzing trace with hash 853715085, now seen corresponding path program 71 times [2022-03-20 18:19:24,873 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:19:24,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1220745527] [2022-03-20 18:19:24,980 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:19:24,981 INFO L85 PathProgramCache]: Analyzing trace with hash -1924873970, now seen corresponding path program 1 times [2022-03-20 18:19:24,981 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:19:24,981 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [443977995] [2022-03-20 18:19:24,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:19:24,981 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:19:24,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:19:25,019 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:19:25,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:19:25,023 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:19:25,023 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:19:25,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [443977995] [2022-03-20 18:19:25,023 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [443977995] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:19:25,023 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:19:25,023 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:19:27,446 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:19:27,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1220745527] [2022-03-20 18:19:27,446 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1220745527] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:19:27,446 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:19:27,446 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [77] imperfect sequences [] total 77 [2022-03-20 18:19:27,446 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [784096257] [2022-03-20 18:19:27,446 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:19:27,446 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2022-03-20 18:19:27,446 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:19:27,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2022-03-20 18:19:27,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=5851, Unknown=0, NotChecked=0, Total=6006 [2022-03-20 18:19:27,448 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand has 77 states, 77 states have (on average 1.0389610389610389) internal successors, (80), 76 states have internal predecessors, (80), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:19:40,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:19:40,680 INFO L93 Difference]: Finished difference Result 99 states and 101 transitions. [2022-03-20 18:19:40,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2022-03-20 18:19:40,681 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 1.0389610389610389) internal successors, (80), 76 states have internal predecessors, (80), 2 states have call successors, (3), 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 84 [2022-03-20 18:19:40,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:19:40,681 INFO L225 Difference]: With dead ends: 99 [2022-03-20 18:19:40,681 INFO L226 Difference]: Without dead ends: 89 [2022-03-20 18:19:40,683 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2774 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=444, Invalid=21906, Unknown=0, NotChecked=0, Total=22350 [2022-03-20 18:19:40,683 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 372 mSDsCounter, 0 mSdLazyCounter, 6219 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 387 SdHoareTripleChecker+Invalid, 6293 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 6219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:19:40,683 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 387 Invalid, 6293 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 6219 Invalid, 0 Unknown, 0 Unchecked, 10.6s Time] [2022-03-20 18:19:40,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-03-20 18:19:40,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2022-03-20 18:19:40,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 83 states have (on average 1.0240963855421688) internal successors, (85), 83 states have internal predecessors, (85), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:19:40,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 90 transitions. [2022-03-20 18:19:40,687 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 90 transitions. Word has length 84 [2022-03-20 18:19:40,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:19:40,687 INFO L478 AbstractCegarLoop]: Abstraction has 89 states and 90 transitions. [2022-03-20 18:19:40,687 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 1.0389610389610389) internal successors, (80), 76 states have internal predecessors, (80), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:19:40,687 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 90 transitions. [2022-03-20 18:19:40,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-03-20 18:19:40,688 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:19:40,688 INFO L499 BasicCegarLoop]: trace histogram [72, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:19:40,688 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71 [2022-03-20 18:19:40,688 INFO L403 AbstractCegarLoop]: === Iteration 73 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:19:40,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:19:40,688 INFO L85 PathProgramCache]: Analyzing trace with hash -1423539609, now seen corresponding path program 72 times [2022-03-20 18:19:40,688 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:19:40,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [920873126] [2022-03-20 18:19:40,833 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:19:40,833 INFO L85 PathProgramCache]: Analyzing trace with hash -959213234, now seen corresponding path program 1 times [2022-03-20 18:19:40,833 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:19:40,833 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1897520089] [2022-03-20 18:19:40,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:19:40,833 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:19:40,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:19:40,858 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:19:40,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:19:40,860 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:19:40,860 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:19:40,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1897520089] [2022-03-20 18:19:40,861 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1897520089] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:19:40,861 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:19:40,861 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:19:43,216 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:19:43,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [920873126] [2022-03-20 18:19:43,217 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [920873126] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:19:43,217 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:19:43,217 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [78] imperfect sequences [] total 78 [2022-03-20 18:19:43,217 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985825598] [2022-03-20 18:19:43,217 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:19:43,217 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 78 states [2022-03-20 18:19:43,217 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:19:43,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2022-03-20 18:19:43,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=6005, Unknown=0, NotChecked=0, Total=6162 [2022-03-20 18:19:43,218 INFO L87 Difference]: Start difference. First operand 89 states and 90 transitions. Second operand has 78 states, 78 states have (on average 1.0384615384615385) internal successors, (81), 77 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:19:58,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:19:58,604 INFO L93 Difference]: Finished difference Result 100 states and 102 transitions. [2022-03-20 18:19:58,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2022-03-20 18:19:58,605 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 78 states have (on average 1.0384615384615385) internal successors, (81), 77 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 85 [2022-03-20 18:19:58,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:19:58,605 INFO L225 Difference]: With dead ends: 100 [2022-03-20 18:19:58,605 INFO L226 Difference]: Without dead ends: 90 [2022-03-20 18:19:58,607 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2849 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=450, Invalid=22502, Unknown=0, NotChecked=0, Total=22952 [2022-03-20 18:19:58,607 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 377 mSDsCounter, 0 mSdLazyCounter, 6378 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 392 SdHoareTripleChecker+Invalid, 6453 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 6378 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.8s IncrementalHoareTripleChecker+Time [2022-03-20 18:19:58,607 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 392 Invalid, 6453 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 6378 Invalid, 0 Unknown, 0 Unchecked, 12.8s Time] [2022-03-20 18:19:58,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-03-20 18:19:58,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2022-03-20 18:19:58,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 84 states have (on average 1.0238095238095237) internal successors, (86), 84 states have internal predecessors, (86), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:19:58,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 91 transitions. [2022-03-20 18:19:58,613 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 91 transitions. Word has length 85 [2022-03-20 18:19:58,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:19:58,613 INFO L478 AbstractCegarLoop]: Abstraction has 90 states and 91 transitions. [2022-03-20 18:19:58,613 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 78 states, 78 states have (on average 1.0384615384615385) internal successors, (81), 77 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:19:58,613 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 91 transitions. [2022-03-20 18:19:58,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-03-20 18:19:58,614 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:19:58,614 INFO L499 BasicCegarLoop]: trace histogram [73, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:19:58,614 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72 [2022-03-20 18:19:58,614 INFO L403 AbstractCegarLoop]: === Iteration 74 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:19:58,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:19:58,614 INFO L85 PathProgramCache]: Analyzing trace with hash 996008909, now seen corresponding path program 73 times [2022-03-20 18:19:58,614 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:19:58,614 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [595238540] [2022-03-20 18:19:58,756 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:19:58,757 INFO L85 PathProgramCache]: Analyzing trace with hash 6447502, now seen corresponding path program 1 times [2022-03-20 18:19:58,757 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:19:58,757 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [317960272] [2022-03-20 18:19:58,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:19:58,757 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:19:58,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:19:58,789 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:19:58,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:19:58,792 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:19:58,792 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:19:58,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [317960272] [2022-03-20 18:19:58,792 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [317960272] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:19:58,792 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:19:58,792 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:20:01,241 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:20:01,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [595238540] [2022-03-20 18:20:01,241 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [595238540] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:20:01,241 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:20:01,241 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [79] imperfect sequences [] total 79 [2022-03-20 18:20:01,242 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [105075964] [2022-03-20 18:20:01,242 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:20:01,242 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-03-20 18:20:01,242 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:20:01,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-03-20 18:20:01,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=6161, Unknown=0, NotChecked=0, Total=6320 [2022-03-20 18:20:01,243 INFO L87 Difference]: Start difference. First operand 90 states and 91 transitions. Second operand has 79 states, 79 states have (on average 1.0379746835443038) internal successors, (82), 78 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) [2022-03-20 18:20:17,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:20:17,330 INFO L93 Difference]: Finished difference Result 101 states and 103 transitions. [2022-03-20 18:20:17,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2022-03-20 18:20:17,331 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 1.0379746835443038) internal successors, (82), 78 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 [2022-03-20 18:20:17,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:20:17,331 INFO L225 Difference]: With dead ends: 101 [2022-03-20 18:20:17,331 INFO L226 Difference]: Without dead ends: 91 [2022-03-20 18:20:17,333 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2925 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=456, Invalid=23106, Unknown=0, NotChecked=0, Total=23562 [2022-03-20 18:20:17,333 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 382 mSDsCounter, 0 mSdLazyCounter, 6539 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 397 SdHoareTripleChecker+Invalid, 6615 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 6539 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:20:17,333 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 397 Invalid, 6615 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 6539 Invalid, 0 Unknown, 0 Unchecked, 13.4s Time] [2022-03-20 18:20:17,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-03-20 18:20:17,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2022-03-20 18:20:17,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 85 states have (on average 1.0235294117647058) internal successors, (87), 85 states have internal predecessors, (87), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:20:17,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2022-03-20 18:20:17,337 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 86 [2022-03-20 18:20:17,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:20:17,337 INFO L478 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2022-03-20 18:20:17,337 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 1.0379746835443038) internal successors, (82), 78 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) [2022-03-20 18:20:17,337 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2022-03-20 18:20:17,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-03-20 18:20:17,337 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:20:17,338 INFO L499 BasicCegarLoop]: trace histogram [74, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:20:17,338 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73 [2022-03-20 18:20:17,338 INFO L403 AbstractCegarLoop]: === Iteration 75 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:20:17,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:20:17,338 INFO L85 PathProgramCache]: Analyzing trace with hash -1307398361, now seen corresponding path program 74 times [2022-03-20 18:20:17,338 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:20:17,338 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [313953674] [2022-03-20 18:20:17,487 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:20:17,488 INFO L85 PathProgramCache]: Analyzing trace with hash 972108238, now seen corresponding path program 1 times [2022-03-20 18:20:17,488 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:20:17,488 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1976888830] [2022-03-20 18:20:17,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:20:17,488 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:20:17,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:20:17,521 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:20:17,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:20:17,523 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:20:17,523 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:20:17,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1976888830] [2022-03-20 18:20:17,523 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1976888830] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:20:17,523 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:20:17,523 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:20:20,111 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:20:20,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [313953674] [2022-03-20 18:20:20,111 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [313953674] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:20:20,111 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:20:20,111 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [80] imperfect sequences [] total 80 [2022-03-20 18:20:20,111 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940046119] [2022-03-20 18:20:20,111 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:20:20,111 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2022-03-20 18:20:20,111 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:20:20,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2022-03-20 18:20:20,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=6319, Unknown=0, NotChecked=0, Total=6480 [2022-03-20 18:20:20,112 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand has 80 states, 80 states have (on average 1.0375) internal successors, (83), 79 states have internal predecessors, (83), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:20:46,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:20:46,054 INFO L93 Difference]: Finished difference Result 102 states and 104 transitions. [2022-03-20 18:20:46,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2022-03-20 18:20:46,056 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 1.0375) internal successors, (83), 79 states have internal predecessors, (83), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 87 [2022-03-20 18:20:46,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:20:46,057 INFO L225 Difference]: With dead ends: 102 [2022-03-20 18:20:46,057 INFO L226 Difference]: Without dead ends: 92 [2022-03-20 18:20:46,058 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3002 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=462, Invalid=23718, Unknown=0, NotChecked=0, Total=24180 [2022-03-20 18:20:46,059 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 387 mSDsCounter, 0 mSdLazyCounter, 6702 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 402 SdHoareTripleChecker+Invalid, 6779 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 6702 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:20:46,059 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 402 Invalid, 6779 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 6702 Invalid, 0 Unknown, 0 Unchecked, 23.2s Time] [2022-03-20 18:20:46,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-03-20 18:20:46,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2022-03-20 18:20:46,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 86 states have (on average 1.0232558139534884) internal successors, (88), 86 states have internal predecessors, (88), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:20:46,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 93 transitions. [2022-03-20 18:20:46,068 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 93 transitions. Word has length 87 [2022-03-20 18:20:46,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:20:46,069 INFO L478 AbstractCegarLoop]: Abstraction has 92 states and 93 transitions. [2022-03-20 18:20:46,069 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 1.0375) internal successors, (83), 79 states have internal predecessors, (83), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:20:46,069 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 93 transitions. [2022-03-20 18:20:46,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-03-20 18:20:46,069 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:20:46,069 INFO L499 BasicCegarLoop]: trace histogram [75, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:20:46,069 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74 [2022-03-20 18:20:46,069 INFO L403 AbstractCegarLoop]: === Iteration 76 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:20:46,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:20:46,070 INFO L85 PathProgramCache]: Analyzing trace with hash 301420301, now seen corresponding path program 75 times [2022-03-20 18:20:46,070 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:20:46,070 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1014553834] [2022-03-20 18:20:46,187 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:20:46,187 INFO L85 PathProgramCache]: Analyzing trace with hash 1937768974, now seen corresponding path program 1 times [2022-03-20 18:20:46,187 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:20:46,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [556432715] [2022-03-20 18:20:46,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:20:46,187 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:20:46,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:20:46,223 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:20:46,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:20:46,226 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:20:46,226 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:20:46,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [556432715] [2022-03-20 18:20:46,226 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [556432715] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:20:46,226 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:20:46,226 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:20:48,806 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:20:48,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1014553834] [2022-03-20 18:20:48,806 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1014553834] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:20:48,806 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:20:48,807 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [81] imperfect sequences [] total 81 [2022-03-20 18:20:48,807 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385098799] [2022-03-20 18:20:48,807 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:20:48,807 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2022-03-20 18:20:48,807 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:20:48,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2022-03-20 18:20:48,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=6479, Unknown=0, NotChecked=0, Total=6642 [2022-03-20 18:20:48,808 INFO L87 Difference]: Start difference. First operand 92 states and 93 transitions. Second operand has 81 states, 81 states have (on average 1.037037037037037) internal successors, (84), 80 states have internal predecessors, (84), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:21:17,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:21:17,757 INFO L93 Difference]: Finished difference Result 103 states and 105 transitions. [2022-03-20 18:21:17,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2022-03-20 18:21:17,758 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 81 states have (on average 1.037037037037037) internal successors, (84), 80 states have internal predecessors, (84), 2 states have call successors, (3), 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 88 [2022-03-20 18:21:17,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:21:17,758 INFO L225 Difference]: With dead ends: 103 [2022-03-20 18:21:17,758 INFO L226 Difference]: Without dead ends: 93 [2022-03-20 18:21:17,760 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3080 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=468, Invalid=24338, Unknown=0, NotChecked=0, Total=24806 [2022-03-20 18:21:17,760 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 392 mSDsCounter, 0 mSdLazyCounter, 6867 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 407 SdHoareTripleChecker+Invalid, 6945 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 6867 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 25.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:21:17,760 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 407 Invalid, 6945 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 6867 Invalid, 0 Unknown, 0 Unchecked, 25.9s Time] [2022-03-20 18:21:17,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-03-20 18:21:17,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2022-03-20 18:21:17,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 87 states have (on average 1.0229885057471264) internal successors, (89), 87 states have internal predecessors, (89), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:21:17,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 94 transitions. [2022-03-20 18:21:17,766 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 94 transitions. Word has length 88 [2022-03-20 18:21:17,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:21:17,766 INFO L478 AbstractCegarLoop]: Abstraction has 93 states and 94 transitions. [2022-03-20 18:21:17,767 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 81 states have (on average 1.037037037037037) internal successors, (84), 80 states have internal predecessors, (84), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:21:17,767 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 94 transitions. [2022-03-20 18:21:17,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-03-20 18:21:17,767 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:21:17,767 INFO L499 BasicCegarLoop]: trace histogram [76, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:21:17,767 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75 [2022-03-20 18:21:17,767 INFO L403 AbstractCegarLoop]: === Iteration 77 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:21:17,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:21:17,768 INFO L85 PathProgramCache]: Analyzing trace with hash -1364808729, now seen corresponding path program 76 times [2022-03-20 18:21:17,768 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:21:17,768 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [340338593] [2022-03-20 18:21:17,887 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:21:17,887 INFO L85 PathProgramCache]: Analyzing trace with hash -1391537586, now seen corresponding path program 1 times [2022-03-20 18:21:17,887 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:21:17,888 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [374776408] [2022-03-20 18:21:17,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:21:17,888 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:21:17,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:21:17,912 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:21:17,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:21:17,916 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:21:17,916 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:21:17,916 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [374776408] [2022-03-20 18:21:17,916 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [374776408] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:21:17,916 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:21:17,916 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:21:20,507 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:21:20,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [340338593] [2022-03-20 18:21:20,508 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [340338593] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:21:20,508 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:21:20,508 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [82] imperfect sequences [] total 82 [2022-03-20 18:21:20,508 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421679424] [2022-03-20 18:21:20,508 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:21:20,508 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2022-03-20 18:21:20,508 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:21:20,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2022-03-20 18:21:20,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=6641, Unknown=0, NotChecked=0, Total=6806 [2022-03-20 18:21:20,509 INFO L87 Difference]: Start difference. First operand 93 states and 94 transitions. Second operand has 82 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 81 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:21:45,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:21:45,806 INFO L93 Difference]: Finished difference Result 104 states and 106 transitions. [2022-03-20 18:21:45,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2022-03-20 18:21:45,807 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 81 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 89 [2022-03-20 18:21:45,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:21:45,808 INFO L225 Difference]: With dead ends: 104 [2022-03-20 18:21:45,808 INFO L226 Difference]: Without dead ends: 94 [2022-03-20 18:21:45,809 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3159 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=474, Invalid=24966, Unknown=0, NotChecked=0, Total=25440 [2022-03-20 18:21:45,809 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 397 mSDsCounter, 0 mSdLazyCounter, 7034 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 412 SdHoareTripleChecker+Invalid, 7113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 7034 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 22.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:21:45,809 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 412 Invalid, 7113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 7034 Invalid, 0 Unknown, 0 Unchecked, 22.5s Time] [2022-03-20 18:21:45,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-03-20 18:21:45,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2022-03-20 18:21:45,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 88 states have (on average 1.0227272727272727) internal successors, (90), 88 states have internal predecessors, (90), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:21:45,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2022-03-20 18:21:45,813 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 89 [2022-03-20 18:21:45,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:21:45,814 INFO L478 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2022-03-20 18:21:45,814 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 81 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:21:45,814 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2022-03-20 18:21:45,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2022-03-20 18:21:45,814 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:21:45,814 INFO L499 BasicCegarLoop]: trace histogram [77, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:21:45,814 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76 [2022-03-20 18:21:45,814 INFO L403 AbstractCegarLoop]: === Iteration 78 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:21:45,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:21:45,815 INFO L85 PathProgramCache]: Analyzing trace with hash -1478301107, now seen corresponding path program 77 times [2022-03-20 18:21:45,815 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:21:45,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1996668225] [2022-03-20 18:21:46,006 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:21:46,006 INFO L85 PathProgramCache]: Analyzing trace with hash -425876850, now seen corresponding path program 1 times [2022-03-20 18:21:46,006 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:21:46,006 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [553404378] [2022-03-20 18:21:46,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:21:46,006 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:21:46,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:21:46,038 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:21:46,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:21:46,041 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:21:46,041 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:21:46,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [553404378] [2022-03-20 18:21:46,041 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [553404378] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:21:46,041 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:21:46,041 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:21:48,702 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:21:48,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1996668225] [2022-03-20 18:21:48,702 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1996668225] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:21:48,702 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:21:48,702 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [83] imperfect sequences [] total 83 [2022-03-20 18:21:48,702 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761862307] [2022-03-20 18:21:48,702 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:21:48,702 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2022-03-20 18:21:48,702 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:21:48,703 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2022-03-20 18:21:48,703 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=6805, Unknown=0, NotChecked=0, Total=6972 [2022-03-20 18:21:48,704 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand has 83 states, 83 states have (on average 1.036144578313253) internal successors, (86), 82 states have internal predecessors, (86), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:22:16,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:22:16,270 INFO L93 Difference]: Finished difference Result 105 states and 107 transitions. [2022-03-20 18:22:16,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2022-03-20 18:22:16,271 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 1.036144578313253) internal successors, (86), 82 states have internal predecessors, (86), 2 states have call successors, (3), 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 90 [2022-03-20 18:22:16,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:22:16,271 INFO L225 Difference]: With dead ends: 105 [2022-03-20 18:22:16,271 INFO L226 Difference]: Without dead ends: 95 [2022-03-20 18:22:16,272 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3239 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=480, Invalid=25602, Unknown=0, NotChecked=0, Total=26082 [2022-03-20 18:22:16,273 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 402 mSDsCounter, 0 mSdLazyCounter, 7203 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 17.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 417 SdHoareTripleChecker+Invalid, 7283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 7203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 24.7s IncrementalHoareTripleChecker+Time [2022-03-20 18:22:16,273 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 417 Invalid, 7283 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 7203 Invalid, 0 Unknown, 0 Unchecked, 24.7s Time] [2022-03-20 18:22:16,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-03-20 18:22:16,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2022-03-20 18:22:16,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 89 states have (on average 1.0224719101123596) internal successors, (91), 89 states have internal predecessors, (91), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:22:16,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 96 transitions. [2022-03-20 18:22:16,277 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 96 transitions. Word has length 90 [2022-03-20 18:22:16,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:22:16,277 INFO L478 AbstractCegarLoop]: Abstraction has 95 states and 96 transitions. [2022-03-20 18:22:16,277 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 1.036144578313253) internal successors, (86), 82 states have internal predecessors, (86), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:22:16,277 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 96 transitions. [2022-03-20 18:22:16,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-03-20 18:22:16,277 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:22:16,278 INFO L499 BasicCegarLoop]: trace histogram [78, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:22:16,278 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77 [2022-03-20 18:22:16,278 INFO L403 AbstractCegarLoop]: === Iteration 79 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:22:16,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:22:16,278 INFO L85 PathProgramCache]: Analyzing trace with hash -701597529, now seen corresponding path program 78 times [2022-03-20 18:22:16,278 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:22:16,278 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1114515113] [2022-03-20 18:22:16,452 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:22:16,452 INFO L85 PathProgramCache]: Analyzing trace with hash 539783886, now seen corresponding path program 1 times [2022-03-20 18:22:16,452 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:22:16,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1472185925] [2022-03-20 18:22:16,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:22:16,452 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:22:16,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:22:16,489 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:22:16,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:22:16,491 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:22:16,491 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:22:16,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1472185925] [2022-03-20 18:22:16,491 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1472185925] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:22:16,491 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:22:16,491 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:22:19,264 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:22:19,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1114515113] [2022-03-20 18:22:19,264 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1114515113] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:22:19,264 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:22:19,264 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [84] imperfect sequences [] total 84 [2022-03-20 18:22:19,264 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [312047634] [2022-03-20 18:22:19,264 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:22:19,265 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2022-03-20 18:22:19,265 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:22:19,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2022-03-20 18:22:19,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=6971, Unknown=0, NotChecked=0, Total=7140 [2022-03-20 18:22:19,266 INFO L87 Difference]: Start difference. First operand 95 states and 96 transitions. Second operand has 84 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 83 states have internal predecessors, (87), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:22:53,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:22:53,083 INFO L93 Difference]: Finished difference Result 106 states and 108 transitions. [2022-03-20 18:22:53,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2022-03-20 18:22:53,084 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 83 states have internal predecessors, (87), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 91 [2022-03-20 18:22:53,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:22:53,085 INFO L225 Difference]: With dead ends: 106 [2022-03-20 18:22:53,085 INFO L226 Difference]: Without dead ends: 96 [2022-03-20 18:22:53,086 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3320 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=486, Invalid=26246, Unknown=0, NotChecked=0, Total=26732 [2022-03-20 18:22:53,086 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 407 mSDsCounter, 0 mSdLazyCounter, 7374 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 422 SdHoareTripleChecker+Invalid, 7455 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 7374 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 30.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:22:53,086 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 422 Invalid, 7455 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 7374 Invalid, 0 Unknown, 0 Unchecked, 30.6s Time] [2022-03-20 18:22:53,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-03-20 18:22:53,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2022-03-20 18:22:53,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 90 states have (on average 1.0222222222222221) internal successors, (92), 90 states have internal predecessors, (92), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:22:53,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 97 transitions. [2022-03-20 18:22:53,090 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 97 transitions. Word has length 91 [2022-03-20 18:22:53,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:22:53,090 INFO L478 AbstractCegarLoop]: Abstraction has 96 states and 97 transitions. [2022-03-20 18:22:53,090 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 83 states have internal predecessors, (87), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:22:53,090 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 97 transitions. [2022-03-20 18:22:53,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-03-20 18:22:53,091 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:22:53,091 INFO L499 BasicCegarLoop]: trace histogram [79, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:22:53,091 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78 [2022-03-20 18:22:53,091 INFO L403 AbstractCegarLoop]: === Iteration 80 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:22:53,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:22:53,091 INFO L85 PathProgramCache]: Analyzing trace with hash 1901376909, now seen corresponding path program 79 times [2022-03-20 18:22:53,091 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:22:53,091 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1856730721] [2022-03-20 18:22:53,238 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:22:53,238 INFO L85 PathProgramCache]: Analyzing trace with hash 1505444622, now seen corresponding path program 1 times [2022-03-20 18:22:53,238 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:22:53,238 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [541573810] [2022-03-20 18:22:53,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:22:53,238 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:22:53,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:22:53,265 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:22:53,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:22:53,267 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:22:53,267 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:22:53,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [541573810] [2022-03-20 18:22:53,267 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [541573810] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:22:53,267 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:22:53,267 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:22:56,096 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:22:56,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1856730721] [2022-03-20 18:22:56,096 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1856730721] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:22:56,096 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:22:56,096 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [85] imperfect sequences [] total 85 [2022-03-20 18:22:56,096 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760551687] [2022-03-20 18:22:56,096 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:22:56,096 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2022-03-20 18:22:56,097 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:22:56,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2022-03-20 18:22:56,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=7139, Unknown=0, NotChecked=0, Total=7310 [2022-03-20 18:22:56,098 INFO L87 Difference]: Start difference. First operand 96 states and 97 transitions. Second operand has 85 states, 85 states have (on average 1.035294117647059) internal successors, (88), 84 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) [2022-03-20 18:23:37,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:23:37,217 INFO L93 Difference]: Finished difference Result 107 states and 109 transitions. [2022-03-20 18:23:37,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2022-03-20 18:23:37,218 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 85 states have (on average 1.035294117647059) internal successors, (88), 84 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 [2022-03-20 18:23:37,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:23:37,218 INFO L225 Difference]: With dead ends: 107 [2022-03-20 18:23:37,218 INFO L226 Difference]: Without dead ends: 97 [2022-03-20 18:23:37,220 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3402 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=492, Invalid=26898, Unknown=0, NotChecked=0, Total=27390 [2022-03-20 18:23:37,220 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 412 mSDsCounter, 0 mSdLazyCounter, 7547 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 26.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 427 SdHoareTripleChecker+Invalid, 7629 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 7547 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 37.7s IncrementalHoareTripleChecker+Time [2022-03-20 18:23:37,220 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 427 Invalid, 7629 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 7547 Invalid, 0 Unknown, 0 Unchecked, 37.7s Time] [2022-03-20 18:23:37,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-03-20 18:23:37,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2022-03-20 18:23:37,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 91 states have (on average 1.021978021978022) internal successors, (93), 91 states have internal predecessors, (93), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:23:37,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2022-03-20 18:23:37,224 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 92 [2022-03-20 18:23:37,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:23:37,225 INFO L478 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2022-03-20 18:23:37,225 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 85 states have (on average 1.035294117647059) internal successors, (88), 84 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) [2022-03-20 18:23:37,225 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2022-03-20 18:23:37,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2022-03-20 18:23:37,225 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:23:37,225 INFO L499 BasicCegarLoop]: trace histogram [80, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:23:37,225 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79 [2022-03-20 18:23:37,225 INFO L403 AbstractCegarLoop]: === Iteration 81 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:23:37,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:23:37,226 INFO L85 PathProgramCache]: Analyzing trace with hash 989205863, now seen corresponding path program 80 times [2022-03-20 18:23:37,226 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:23:37,226 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1987430810] [2022-03-20 18:23:37,421 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:23:37,422 INFO L85 PathProgramCache]: Analyzing trace with hash -1823861938, now seen corresponding path program 1 times [2022-03-20 18:23:37,422 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:23:37,422 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1431641368] [2022-03-20 18:23:37,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:23:37,422 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:23:37,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:23:37,454 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:23:37,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:23:37,457 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:23:37,457 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:23:37,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1431641368] [2022-03-20 18:23:37,457 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1431641368] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:23:37,457 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:23:37,457 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:23:40,369 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:23:40,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1987430810] [2022-03-20 18:23:40,370 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1987430810] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:23:40,370 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:23:40,370 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [86] imperfect sequences [] total 86 [2022-03-20 18:23:40,370 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [887477910] [2022-03-20 18:23:40,370 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:23:40,370 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2022-03-20 18:23:40,370 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:23:40,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2022-03-20 18:23:40,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=7309, Unknown=0, NotChecked=0, Total=7482 [2022-03-20 18:23:40,371 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand has 86 states, 86 states have (on average 1.0348837209302326) internal successors, (89), 85 states have internal predecessors, (89), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:24:32,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:24:32,433 INFO L93 Difference]: Finished difference Result 108 states and 110 transitions. [2022-03-20 18:24:32,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2022-03-20 18:24:32,433 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 1.0348837209302326) internal successors, (89), 85 states have internal predecessors, (89), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 93 [2022-03-20 18:24:32,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:24:32,434 INFO L225 Difference]: With dead ends: 108 [2022-03-20 18:24:32,434 INFO L226 Difference]: Without dead ends: 98 [2022-03-20 18:24:32,435 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3485 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=498, Invalid=27558, Unknown=0, NotChecked=0, Total=28056 [2022-03-20 18:24:32,436 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 417 mSDsCounter, 0 mSdLazyCounter, 7722 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 33.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 7805 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 7722 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 48.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:24:32,436 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 432 Invalid, 7805 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 7722 Invalid, 0 Unknown, 0 Unchecked, 48.5s Time] [2022-03-20 18:24:32,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-03-20 18:24:32,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2022-03-20 18:24:32,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 92 states have (on average 1.0217391304347827) internal successors, (94), 92 states have internal predecessors, (94), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:24:32,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 99 transitions. [2022-03-20 18:24:32,440 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 99 transitions. Word has length 93 [2022-03-20 18:24:32,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:24:32,440 INFO L478 AbstractCegarLoop]: Abstraction has 98 states and 99 transitions. [2022-03-20 18:24:32,440 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 86 states have (on average 1.0348837209302326) internal successors, (89), 85 states have internal predecessors, (89), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:24:32,440 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 99 transitions. [2022-03-20 18:24:32,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-03-20 18:24:32,440 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:24:32,440 INFO L499 BasicCegarLoop]: trace histogram [81, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:24:32,440 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80 [2022-03-20 18:24:32,440 INFO L403 AbstractCegarLoop]: === Iteration 82 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:24:32,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:24:32,441 INFO L85 PathProgramCache]: Analyzing trace with hash -1518292787, now seen corresponding path program 81 times [2022-03-20 18:24:32,441 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:24:32,441 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [5266775] [2022-03-20 18:24:32,554 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:24:32,554 INFO L85 PathProgramCache]: Analyzing trace with hash -858201202, now seen corresponding path program 1 times [2022-03-20 18:24:32,554 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:24:32,554 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [194308469] [2022-03-20 18:24:32,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:24:32,555 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:24:32,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:24:32,594 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:24:32,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:24:32,597 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:24:32,597 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:24:32,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [194308469] [2022-03-20 18:24:32,597 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [194308469] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:24:32,597 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:24:32,597 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:24:35,496 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:24:35,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [5266775] [2022-03-20 18:24:35,496 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [5266775] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:24:35,496 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:24:35,496 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [87] imperfect sequences [] total 87 [2022-03-20 18:24:35,496 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1003746509] [2022-03-20 18:24:35,496 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:24:35,496 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2022-03-20 18:24:35,496 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:24:35,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2022-03-20 18:24:35,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=7481, Unknown=0, NotChecked=0, Total=7656 [2022-03-20 18:24:35,498 INFO L87 Difference]: Start difference. First operand 98 states and 99 transitions. Second operand has 87 states, 87 states have (on average 1.0344827586206897) internal successors, (90), 86 states have internal predecessors, (90), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:25:17,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:25:17,225 INFO L93 Difference]: Finished difference Result 109 states and 111 transitions. [2022-03-20 18:25:17,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2022-03-20 18:25:17,226 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 1.0344827586206897) internal successors, (90), 86 states have internal predecessors, (90), 2 states have call successors, (3), 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 94 [2022-03-20 18:25:17,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:25:17,226 INFO L225 Difference]: With dead ends: 109 [2022-03-20 18:25:17,226 INFO L226 Difference]: Without dead ends: 99 [2022-03-20 18:25:17,228 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3569 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=504, Invalid=28226, Unknown=0, NotChecked=0, Total=28730 [2022-03-20 18:25:17,228 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 422 mSDsCounter, 0 mSdLazyCounter, 7899 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 26.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 437 SdHoareTripleChecker+Invalid, 7983 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 7899 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 38.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:25:17,228 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 437 Invalid, 7983 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 7899 Invalid, 0 Unknown, 0 Unchecked, 38.6s Time] [2022-03-20 18:25:17,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-03-20 18:25:17,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2022-03-20 18:25:17,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 93 states have (on average 1.021505376344086) internal successors, (95), 93 states have internal predecessors, (95), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:25:17,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2022-03-20 18:25:17,233 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 94 [2022-03-20 18:25:17,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:25:17,233 INFO L478 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2022-03-20 18:25:17,233 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 87 states have (on average 1.0344827586206897) internal successors, (90), 86 states have internal predecessors, (90), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:25:17,233 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2022-03-20 18:25:17,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-03-20 18:25:17,234 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:25:17,234 INFO L499 BasicCegarLoop]: trace histogram [82, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:25:17,234 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81 [2022-03-20 18:25:17,234 INFO L403 AbstractCegarLoop]: === Iteration 83 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:25:17,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:25:17,235 INFO L85 PathProgramCache]: Analyzing trace with hash -1941339609, now seen corresponding path program 82 times [2022-03-20 18:25:17,235 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:25:17,235 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [845255882] [2022-03-20 18:25:17,352 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:25:17,353 INFO L85 PathProgramCache]: Analyzing trace with hash 107459534, now seen corresponding path program 1 times [2022-03-20 18:25:17,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:25:17,353 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1228514522] [2022-03-20 18:25:17,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:25:17,353 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:25:17,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:25:17,380 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:25:17,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:25:17,381 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:25:17,382 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:25:17,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1228514522] [2022-03-20 18:25:17,382 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1228514522] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:25:17,382 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:25:17,382 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:25:20,402 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:25:20,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [845255882] [2022-03-20 18:25:20,403 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [845255882] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:25:20,403 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:25:20,403 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [88] imperfect sequences [] total 88 [2022-03-20 18:25:20,403 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313963998] [2022-03-20 18:25:20,403 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:25:20,403 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2022-03-20 18:25:20,403 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:25:20,404 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2022-03-20 18:25:20,404 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=7655, Unknown=0, NotChecked=0, Total=7832 [2022-03-20 18:25:20,404 INFO L87 Difference]: Start difference. First operand 99 states and 100 transitions. Second operand has 88 states, 88 states have (on average 1.0340909090909092) internal successors, (91), 87 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:26:26,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:26:26,005 INFO L93 Difference]: Finished difference Result 110 states and 112 transitions. [2022-03-20 18:26:26,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2022-03-20 18:26:26,006 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 1.0340909090909092) internal successors, (91), 87 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 95 [2022-03-20 18:26:26,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:26:26,007 INFO L225 Difference]: With dead ends: 110 [2022-03-20 18:26:26,007 INFO L226 Difference]: Without dead ends: 100 [2022-03-20 18:26:26,008 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3654 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=510, Invalid=28902, Unknown=0, NotChecked=0, Total=29412 [2022-03-20 18:26:26,009 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 427 mSDsCounter, 0 mSdLazyCounter, 8078 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 42.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 442 SdHoareTripleChecker+Invalid, 8163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 8078 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 61.8s IncrementalHoareTripleChecker+Time [2022-03-20 18:26:26,009 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 442 Invalid, 8163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 8078 Invalid, 0 Unknown, 0 Unchecked, 61.8s Time] [2022-03-20 18:26:26,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2022-03-20 18:26:26,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2022-03-20 18:26:26,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 94 states have (on average 1.0212765957446808) internal successors, (96), 94 states have internal predecessors, (96), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:26:26,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2022-03-20 18:26:26,013 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 95 [2022-03-20 18:26:26,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:26:26,013 INFO L478 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2022-03-20 18:26:26,013 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 88 states have (on average 1.0340909090909092) internal successors, (91), 87 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:26:26,013 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2022-03-20 18:26:26,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2022-03-20 18:26:26,014 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:26:26,014 INFO L499 BasicCegarLoop]: trace histogram [83, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:26:26,014 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82 [2022-03-20 18:26:26,014 INFO L403 AbstractCegarLoop]: === Iteration 84 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:26:26,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:26:26,014 INFO L85 PathProgramCache]: Analyzing trace with hash 2124078093, now seen corresponding path program 83 times [2022-03-20 18:26:26,014 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:26:26,014 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1939053326] [2022-03-20 18:26:26,163 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:26:26,163 INFO L85 PathProgramCache]: Analyzing trace with hash 1073120270, now seen corresponding path program 1 times [2022-03-20 18:26:26,163 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:26:26,163 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [313607646] [2022-03-20 18:26:26,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:26:26,163 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:26:26,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:26:26,198 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:26:26,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:26:26,200 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:26:26,201 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:26:26,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [313607646] [2022-03-20 18:26:26,201 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [313607646] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:26:26,201 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:26:26,201 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:26:29,305 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:26:29,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1939053326] [2022-03-20 18:26:29,306 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1939053326] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:26:29,306 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:26:29,306 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [89] imperfect sequences [] total 89 [2022-03-20 18:26:29,306 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [144291493] [2022-03-20 18:26:29,306 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:26:29,306 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2022-03-20 18:26:29,306 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:26:29,307 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2022-03-20 18:26:29,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=7831, Unknown=0, NotChecked=0, Total=8010 [2022-03-20 18:26:29,307 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand has 89 states, 89 states have (on average 1.0337078651685394) internal successors, (92), 88 states have internal predecessors, (92), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:27:41,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:27:41,527 INFO L93 Difference]: Finished difference Result 111 states and 113 transitions. [2022-03-20 18:27:41,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2022-03-20 18:27:41,528 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 1.0337078651685394) internal successors, (92), 88 states have internal predecessors, (92), 2 states have call successors, (3), 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 96 [2022-03-20 18:27:41,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:27:41,528 INFO L225 Difference]: With dead ends: 111 [2022-03-20 18:27:41,529 INFO L226 Difference]: Without dead ends: 101 [2022-03-20 18:27:41,530 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3740 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=516, Invalid=29586, Unknown=0, NotChecked=0, Total=30102 [2022-03-20 18:27:41,530 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 432 mSDsCounter, 0 mSdLazyCounter, 8259 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 47.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 447 SdHoareTripleChecker+Invalid, 8345 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 8259 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 68.8s IncrementalHoareTripleChecker+Time [2022-03-20 18:27:41,530 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 447 Invalid, 8345 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 8259 Invalid, 0 Unknown, 0 Unchecked, 68.8s Time] [2022-03-20 18:27:41,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-03-20 18:27:41,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2022-03-20 18:27:41,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 95 states have (on average 1.0210526315789474) internal successors, (97), 95 states have internal predecessors, (97), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:27:41,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 102 transitions. [2022-03-20 18:27:41,536 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 102 transitions. Word has length 96 [2022-03-20 18:27:41,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:27:41,536 INFO L478 AbstractCegarLoop]: Abstraction has 101 states and 102 transitions. [2022-03-20 18:27:41,536 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 89 states have (on average 1.0337078651685394) internal successors, (92), 88 states have internal predecessors, (92), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:27:41,537 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 102 transitions. [2022-03-20 18:27:41,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2022-03-20 18:27:41,537 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:27:41,537 INFO L499 BasicCegarLoop]: trace histogram [84, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:27:41,537 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83 [2022-03-20 18:27:41,537 INFO L403 AbstractCegarLoop]: === Iteration 85 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:27:41,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:27:41,537 INFO L85 PathProgramCache]: Analyzing trace with hash -696992025, now seen corresponding path program 84 times [2022-03-20 18:27:41,538 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:27:41,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2120261553] [2022-03-20 18:27:41,687 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:27:41,688 INFO L85 PathProgramCache]: Analyzing trace with hash 2038781006, now seen corresponding path program 1 times [2022-03-20 18:27:41,688 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:27:41,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2054148712] [2022-03-20 18:27:41,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:27:41,688 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:27:41,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:27:41,719 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:27:41,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:27:41,721 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:27:41,722 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:27:41,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2054148712] [2022-03-20 18:27:41,722 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2054148712] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:27:41,722 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:27:41,722 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:27:44,827 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:27:44,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2120261553] [2022-03-20 18:27:44,827 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2120261553] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:27:44,827 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:27:44,827 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [90] imperfect sequences [] total 90 [2022-03-20 18:27:44,827 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307576975] [2022-03-20 18:27:44,827 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:27:44,828 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 90 states [2022-03-20 18:27:44,828 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:27:44,828 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2022-03-20 18:27:44,829 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=8009, Unknown=0, NotChecked=0, Total=8190 [2022-03-20 18:27:44,829 INFO L87 Difference]: Start difference. First operand 101 states and 102 transitions. Second operand has 90 states, 90 states have (on average 1.0333333333333334) internal successors, (93), 89 states have internal predecessors, (93), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)