/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/heapsort.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 18:15:15,452 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 18:15:15,454 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 18:15:15,490 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 18:15:15,529 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 18:15:15,530 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 18:15:15,531 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 18:15:15,532 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 18:15:15,540 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 18:15:15,541 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 18:15:15,541 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 18:15:15,542 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 18:15:15,542 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 18:15:15,542 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 18:15:15,542 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 18:15:15,542 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 18:15:15,542 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 18:15:15,543 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 18:15:15,543 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 18:15:15,543 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 18:15:15,543 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 18:15:15,543 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 18:15:15,543 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 18:15:15,543 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 18:15:15,543 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 18:15:15,543 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 18:15:15,543 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 18:15:15,543 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 18:15:15,544 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 18:15:15,544 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-20 18:15:15,544 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 18:15:15,709 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 18:15:15,729 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 18:15:15,731 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 18:15:15,732 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 18:15:15,732 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 18:15:15,733 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/heapsort.i [2022-03-20 18:15:15,796 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2c4ca7c78/5af0248c795b4bf4af6b002661b534fe/FLAGdbef2ede6 [2022-03-20 18:15:16,150 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 18:15:16,151 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/heapsort.i [2022-03-20 18:15:16,155 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2c4ca7c78/5af0248c795b4bf4af6b002661b534fe/FLAGdbef2ede6 [2022-03-20 18:15:16,164 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2c4ca7c78/5af0248c795b4bf4af6b002661b534fe [2022-03-20 18:15:16,165 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 18:15:16,166 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 18:15:16,167 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 18:15:16,167 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 18:15:16,169 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 18:15:16,170 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 06:15:16" (1/1) ... [2022-03-20 18:15:16,171 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2f1ad5b1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:16, skipping insertion in model container [2022-03-20 18:15:16,171 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 06:15:16" (1/1) ... [2022-03-20 18:15:16,175 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 18:15:16,185 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 18:15:16,293 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/heapsort.i[893,906] [2022-03-20 18:15:16,331 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 18:15:16,336 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 18:15:16,350 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/heapsort.i[893,906] [2022-03-20 18:15:16,358 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 18:15:16,367 INFO L208 MainTranslator]: Completed translation [2022-03-20 18:15:16,367 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:16 WrapperNode [2022-03-20 18:15:16,367 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 18:15:16,368 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 18:15:16,368 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 18:15:16,368 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 18:15:16,376 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:16" (1/1) ... [2022-03-20 18:15:16,376 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:16" (1/1) ... [2022-03-20 18:15:16,380 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:16" (1/1) ... [2022-03-20 18:15:16,381 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:16" (1/1) ... [2022-03-20 18:15:16,384 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:16" (1/1) ... [2022-03-20 18:15:16,387 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:16" (1/1) ... [2022-03-20 18:15:16,388 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:16" (1/1) ... [2022-03-20 18:15:16,389 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 18:15:16,390 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 18:15:16,390 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 18:15:16,390 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 18:15:16,391 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:16" (1/1) ... [2022-03-20 18:15:16,395 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 18:15:16,402 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:15:16,411 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 18:15:16,423 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 18:15:16,437 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 18:15:16,438 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 18:15:16,438 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 18:15:16,438 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-20 18:15:16,438 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 18:15:16,438 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 18:15:16,438 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 18:15:16,438 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 18:15:16,439 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2022-03-20 18:15:16,439 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2022-03-20 18:15:16,439 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 18:15:16,439 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 18:15:16,439 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-20 18:15:16,439 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 18:15:16,439 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-03-20 18:15:16,439 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 18:15:16,439 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 18:15:16,439 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 18:15:16,439 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 18:15:16,440 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 18:15:16,440 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 18:15:16,440 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 18:15:16,486 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 18:15:16,487 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 18:15:16,622 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 18:15:16,626 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 18:15:16,626 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-03-20 18:15:16,628 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 06:15:16 BoogieIcfgContainer [2022-03-20 18:15:16,628 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 18:15:16,629 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 18:15:16,629 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 18:15:16,632 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 18:15:16,632 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 06:15:16" (1/3) ... [2022-03-20 18:15:16,632 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@142cf918 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 06:15:16, skipping insertion in model container [2022-03-20 18:15:16,632 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:16" (2/3) ... [2022-03-20 18:15:16,633 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@142cf918 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 06:15:16, skipping insertion in model container [2022-03-20 18:15:16,633 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 06:15:16" (3/3) ... [2022-03-20 18:15:16,634 INFO L111 eAbstractionObserver]: Analyzing ICFG heapsort.i [2022-03-20 18:15:16,637 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 18:15:16,637 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 18:15:16,667 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 18:15:16,671 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 18:15:16,672 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 18:15:16,682 INFO L276 IsEmpty]: Start isEmpty. Operand has 44 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 24 states have internal predecessors, (35), 16 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2022-03-20 18:15:16,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-20 18:15:16,688 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:16,688 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:16,689 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:16,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:16,692 INFO L85 PathProgramCache]: Analyzing trace with hash -250128701, now seen corresponding path program 1 times [2022-03-20 18:15:16,698 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:16,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1299948063] [2022-03-20 18:15:16,707 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:15:16,707 INFO L85 PathProgramCache]: Analyzing trace with hash -250128701, now seen corresponding path program 2 times [2022-03-20 18:15:16,709 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:16,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1329559805] [2022-03-20 18:15:16,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:16,710 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:16,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:16,941 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:16,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:16,953 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 18:15:16,953 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:16,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1329559805] [2022-03-20 18:15:16,954 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1329559805] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:16,954 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:16,954 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:15:16,956 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:16,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1299948063] [2022-03-20 18:15:16,957 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1299948063] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:16,957 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:16,957 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:15:16,957 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706746808] [2022-03-20 18:15:16,958 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:16,961 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 18:15:16,961 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:16,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 18:15:16,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-20 18:15:16,995 INFO L87 Difference]: Start difference. First operand has 44 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 24 states have internal predecessors, (35), 16 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 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 18:15:17,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:17,310 INFO L93 Difference]: Finished difference Result 88 states and 148 transitions. [2022-03-20 18:15:17,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 18:15:17,312 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 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 18:15:17,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:17,318 INFO L225 Difference]: With dead ends: 88 [2022-03-20 18:15:17,319 INFO L226 Difference]: Without dead ends: 44 [2022-03-20 18:15:17,322 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-03-20 18:15:17,326 INFO L913 BasicCegarLoop]: 42 mSDtfsCounter, 55 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 172 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:17,327 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 63 Invalid, 219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 172 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:15:17,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-03-20 18:15:17,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2022-03-20 18:15:17,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 23 states have internal predecessors, (30), 16 states have call successors, (16), 4 states have call predecessors, (16), 3 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-03-20 18:15:17,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 61 transitions. [2022-03-20 18:15:17,376 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 61 transitions. Word has length 15 [2022-03-20 18:15:17,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:17,376 INFO L478 AbstractCegarLoop]: Abstraction has 43 states and 61 transitions. [2022-03-20 18:15:17,376 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 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 18:15:17,376 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 61 transitions. [2022-03-20 18:15:17,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-20 18:15:17,377 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:17,377 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:17,377 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 18:15:17,377 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:17,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:17,378 INFO L85 PathProgramCache]: Analyzing trace with hash -254865470, now seen corresponding path program 1 times [2022-03-20 18:15:17,378 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:17,378 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1922174629] [2022-03-20 18:15:17,379 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:15:17,379 INFO L85 PathProgramCache]: Analyzing trace with hash -254865470, now seen corresponding path program 2 times [2022-03-20 18:15:17,379 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:17,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [542212561] [2022-03-20 18:15:17,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:17,380 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:17,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:17,460 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:17,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:17,467 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:17,467 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:17,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [542212561] [2022-03-20 18:15:17,467 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [542212561] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:17,467 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:17,468 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:15:17,468 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:17,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1922174629] [2022-03-20 18:15:17,468 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1922174629] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:17,468 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:17,468 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:15:17,468 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1362180436] [2022-03-20 18:15:17,468 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:17,469 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 18:15:17,469 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:17,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 18:15:17,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-20 18:15:17,470 INFO L87 Difference]: Start difference. First operand 43 states and 61 transitions. Second operand has 6 states, 5 states have (on average 2.2) internal successors, (11), 4 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 18:15:17,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:17,689 INFO L93 Difference]: Finished difference Result 71 states and 105 transitions. [2022-03-20 18:15:17,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 18:15:17,689 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 4 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 18:15:17,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:17,691 INFO L225 Difference]: With dead ends: 71 [2022-03-20 18:15:17,691 INFO L226 Difference]: Without dead ends: 69 [2022-03-20 18:15:17,691 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-03-20 18:15:17,692 INFO L913 BasicCegarLoop]: 39 mSDtfsCounter, 57 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 212 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 272 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 212 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:17,693 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 56 Invalid, 272 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 212 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:15:17,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-03-20 18:15:17,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 47. [2022-03-20 18:15:17,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 26 states have internal predecessors, (33), 16 states have call successors, (16), 5 states have call predecessors, (16), 4 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-03-20 18:15:17,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 64 transitions. [2022-03-20 18:15:17,703 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 64 transitions. Word has length 15 [2022-03-20 18:15:17,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:17,703 INFO L478 AbstractCegarLoop]: Abstraction has 47 states and 64 transitions. [2022-03-20 18:15:17,704 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 4 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 18:15:17,704 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 64 transitions. [2022-03-20 18:15:17,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-20 18:15:17,704 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:17,704 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:17,704 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-20 18:15:17,705 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:17,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:17,705 INFO L85 PathProgramCache]: Analyzing trace with hash -216435080, now seen corresponding path program 1 times [2022-03-20 18:15:17,705 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:17,705 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [796825900] [2022-03-20 18:15:17,706 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:15:17,706 INFO L85 PathProgramCache]: Analyzing trace with hash -216435080, now seen corresponding path program 2 times [2022-03-20 18:15:17,706 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:17,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1067133981] [2022-03-20 18:15:17,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:17,706 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:17,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:17,745 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:17,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:17,750 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:17,750 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:17,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1067133981] [2022-03-20 18:15:17,750 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1067133981] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:17,751 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:17,751 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:17,751 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:17,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [796825900] [2022-03-20 18:15:17,751 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [796825900] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:17,751 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:17,751 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:17,752 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331496046] [2022-03-20 18:15:17,752 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:17,752 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 18:15:17,752 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:17,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 18:15:17,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-03-20 18:15:17,753 INFO L87 Difference]: Start difference. First operand 47 states and 64 transitions. Second operand has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 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 18:15:18,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:18,048 INFO L93 Difference]: Finished difference Result 80 states and 115 transitions. [2022-03-20 18:15:18,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 18:15:18,048 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 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 18:15:18,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:18,050 INFO L225 Difference]: With dead ends: 80 [2022-03-20 18:15:18,050 INFO L226 Difference]: Without dead ends: 78 [2022-03-20 18:15:18,051 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2022-03-20 18:15:18,051 INFO L913 BasicCegarLoop]: 43 mSDtfsCounter, 68 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 392 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:18,052 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 65 Invalid, 392 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:15:18,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-03-20 18:15:18,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 68. [2022-03-20 18:15:18,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 36 states have (on average 1.3055555555555556) internal successors, (47), 36 states have internal predecessors, (47), 26 states have call successors, (26), 6 states have call predecessors, (26), 5 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2022-03-20 18:15:18,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 98 transitions. [2022-03-20 18:15:18,065 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 98 transitions. Word has length 15 [2022-03-20 18:15:18,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:18,065 INFO L478 AbstractCegarLoop]: Abstraction has 68 states and 98 transitions. [2022-03-20 18:15:18,065 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 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 18:15:18,066 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 98 transitions. [2022-03-20 18:15:18,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-20 18:15:18,066 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:18,066 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:18,066 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-20 18:15:18,067 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:18,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:18,067 INFO L85 PathProgramCache]: Analyzing trace with hash -228679181, now seen corresponding path program 1 times [2022-03-20 18:15:18,067 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:18,067 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [181006241] [2022-03-20 18:15:18,068 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:15:18,068 INFO L85 PathProgramCache]: Analyzing trace with hash -228679181, now seen corresponding path program 2 times [2022-03-20 18:15:18,068 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:18,068 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [65844320] [2022-03-20 18:15:18,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:18,068 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:18,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:18,155 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:18,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:18,164 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 18:15:18,164 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:18,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [65844320] [2022-03-20 18:15:18,165 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [65844320] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:18,165 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:18,165 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:18,165 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:18,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [181006241] [2022-03-20 18:15:18,165 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [181006241] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:18,166 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:18,166 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:18,166 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073489223] [2022-03-20 18:15:18,166 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:18,175 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 18:15:18,176 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:18,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 18:15:18,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-03-20 18:15:18,176 INFO L87 Difference]: Start difference. First operand 68 states and 98 transitions. Second operand has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 5 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 18:15:18,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:18,406 INFO L93 Difference]: Finished difference Result 122 states and 183 transitions. [2022-03-20 18:15:18,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 18:15:18,408 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 5 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 18:15:18,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:18,409 INFO L225 Difference]: With dead ends: 122 [2022-03-20 18:15:18,409 INFO L226 Difference]: Without dead ends: 120 [2022-03-20 18:15:18,410 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2022-03-20 18:15:18,410 INFO L913 BasicCegarLoop]: 34 mSDtfsCounter, 65 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 285 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 378 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 285 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:18,411 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 56 Invalid, 378 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 285 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:15:18,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2022-03-20 18:15:18,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 94. [2022-03-20 18:15:18,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 49 states have (on average 1.3265306122448979) internal successors, (65), 49 states have internal predecessors, (65), 38 states have call successors, (38), 7 states have call predecessors, (38), 6 states have return successors, (37), 37 states have call predecessors, (37), 37 states have call successors, (37) [2022-03-20 18:15:18,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 140 transitions. [2022-03-20 18:15:18,425 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 140 transitions. Word has length 15 [2022-03-20 18:15:18,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:18,426 INFO L478 AbstractCegarLoop]: Abstraction has 94 states and 140 transitions. [2022-03-20 18:15:18,426 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 5 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 18:15:18,426 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 140 transitions. [2022-03-20 18:15:18,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-20 18:15:18,427 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:18,427 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:18,427 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-03-20 18:15:18,427 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:18,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:18,427 INFO L85 PathProgramCache]: Analyzing trace with hash 1266022048, now seen corresponding path program 1 times [2022-03-20 18:15:18,427 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:18,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1941527657] [2022-03-20 18:15:18,428 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:15:18,428 INFO L85 PathProgramCache]: Analyzing trace with hash 1266022048, now seen corresponding path program 2 times [2022-03-20 18:15:18,428 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:18,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [114806461] [2022-03-20 18:15:18,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:18,429 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:18,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:18,461 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:18,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:18,465 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-20 18:15:18,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:18,469 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:18,469 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:18,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [114806461] [2022-03-20 18:15:18,469 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [114806461] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:18,469 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:18,469 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:15:18,469 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:18,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1941527657] [2022-03-20 18:15:18,470 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1941527657] 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 [6] imperfect sequences [] total 6 [2022-03-20 18:15:18,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088084743] [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 6 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 6 interpolants. [2022-03-20 18:15:18,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-20 18:15:18,471 INFO L87 Difference]: Start difference. First operand 94 states and 140 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:18,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:18,588 INFO L93 Difference]: Finished difference Result 100 states and 145 transitions. [2022-03-20 18:15:18,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 18:15:18,588 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2022-03-20 18:15:18,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:18,591 INFO L225 Difference]: With dead ends: 100 [2022-03-20 18:15:18,592 INFO L226 Difference]: Without dead ends: 98 [2022-03-20 18:15:18,592 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-03-20 18:15:18,594 INFO L913 BasicCegarLoop]: 38 mSDtfsCounter, 39 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:18,595 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 55 Invalid, 197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:15:18,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-03-20 18:15:18,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2022-03-20 18:15:18,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 52 states have (on average 1.3076923076923077) internal successors, (68), 52 states have internal predecessors, (68), 38 states have call successors, (38), 8 states have call predecessors, (38), 7 states have return successors, (37), 37 states have call predecessors, (37), 37 states have call successors, (37) [2022-03-20 18:15:18,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 143 transitions. [2022-03-20 18:15:18,624 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 143 transitions. Word has length 20 [2022-03-20 18:15:18,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:18,624 INFO L478 AbstractCegarLoop]: Abstraction has 98 states and 143 transitions. [2022-03-20 18:15:18,624 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:18,624 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 143 transitions. [2022-03-20 18:15:18,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-20 18:15:18,625 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:18,625 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:18,625 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-03-20 18:15:18,625 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:18,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:18,626 INFO L85 PathProgramCache]: Analyzing trace with hash 884659585, now seen corresponding path program 1 times [2022-03-20 18:15:18,626 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:18,626 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1758420475] [2022-03-20 18:15:18,626 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:15:18,626 INFO L85 PathProgramCache]: Analyzing trace with hash 884659585, now seen corresponding path program 2 times [2022-03-20 18:15:18,626 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:18,626 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [647983975] [2022-03-20 18:15:18,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:18,627 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:18,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:18,693 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:18,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:18,698 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-20 18:15:18,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:18,701 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:18,702 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:18,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [647983975] [2022-03-20 18:15:18,702 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [647983975] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:18,702 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:18,702 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:15:18,702 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:18,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1758420475] [2022-03-20 18:15:18,702 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1758420475] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:18,703 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:18,703 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:15:18,703 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864284213] [2022-03-20 18:15:18,703 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:18,703 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:15:18,703 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:18,703 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:15:18,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-03-20 18:15:18,704 INFO L87 Difference]: Start difference. First operand 98 states and 143 transitions. Second operand has 8 states, 8 states have (on average 1.75) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:18,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:18,954 INFO L93 Difference]: Finished difference Result 131 states and 194 transitions. [2022-03-20 18:15:18,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 18:15:18,954 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2022-03-20 18:15:18,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:18,955 INFO L225 Difference]: With dead ends: 131 [2022-03-20 18:15:18,955 INFO L226 Difference]: Without dead ends: 129 [2022-03-20 18:15:18,956 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2022-03-20 18:15:18,956 INFO L913 BasicCegarLoop]: 41 mSDtfsCounter, 86 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 314 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 435 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 314 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:18,956 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 63 Invalid, 435 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 314 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:15:18,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2022-03-20 18:15:18,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 126. [2022-03-20 18:15:18,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 65 states have (on average 1.323076923076923) internal successors, (86), 66 states have internal predecessors, (86), 52 states have call successors, (52), 9 states have call predecessors, (52), 8 states have return successors, (51), 50 states have call predecessors, (51), 51 states have call successors, (51) [2022-03-20 18:15:18,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 189 transitions. [2022-03-20 18:15:18,978 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 189 transitions. Word has length 20 [2022-03-20 18:15:18,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:18,978 INFO L478 AbstractCegarLoop]: Abstraction has 126 states and 189 transitions. [2022-03-20 18:15:18,978 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:18,978 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 189 transitions. [2022-03-20 18:15:18,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-20 18:15:18,979 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:18,980 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:18,980 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-03-20 18:15:18,980 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:18,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:18,981 INFO L85 PathProgramCache]: Analyzing trace with hash 1424204299, now seen corresponding path program 1 times [2022-03-20 18:15:18,981 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:18,981 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [988435211] [2022-03-20 18:15:18,981 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:15:18,982 INFO L85 PathProgramCache]: Analyzing trace with hash 1424204299, now seen corresponding path program 2 times [2022-03-20 18:15:18,982 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:18,982 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [641030935] [2022-03-20 18:15:18,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:18,982 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:18,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:19,037 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:19,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:19,044 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-20 18:15:19,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:19,050 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:19,050 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:19,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [641030935] [2022-03-20 18:15:19,057 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [641030935] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:19,057 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:19,057 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:19,057 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:19,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [988435211] [2022-03-20 18:15:19,058 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [988435211] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:19,058 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:19,058 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:19,058 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203239564] [2022-03-20 18:15:19,058 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:19,058 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 18:15:19,058 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:19,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 18:15:19,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-03-20 18:15:19,059 INFO L87 Difference]: Start difference. First operand 126 states and 189 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:19,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:19,298 INFO L93 Difference]: Finished difference Result 188 states and 291 transitions. [2022-03-20 18:15:19,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 18:15:19,299 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2022-03-20 18:15:19,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:19,302 INFO L225 Difference]: With dead ends: 188 [2022-03-20 18:15:19,302 INFO L226 Difference]: Without dead ends: 186 [2022-03-20 18:15:19,302 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2022-03-20 18:15:19,303 INFO L913 BasicCegarLoop]: 43 mSDtfsCounter, 54 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 256 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 351 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 256 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:19,303 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 65 Invalid, 351 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 256 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:15:19,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2022-03-20 18:15:19,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 162. [2022-03-20 18:15:19,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 76 states have (on average 1.3289473684210527) internal successors, (101), 81 states have internal predecessors, (101), 76 states have call successors, (76), 10 states have call predecessors, (76), 9 states have return successors, (75), 70 states have call predecessors, (75), 75 states have call successors, (75) [2022-03-20 18:15:19,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 252 transitions. [2022-03-20 18:15:19,342 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 252 transitions. Word has length 20 [2022-03-20 18:15:19,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:19,343 INFO L478 AbstractCegarLoop]: Abstraction has 162 states and 252 transitions. [2022-03-20 18:15:19,343 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:19,343 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 252 transitions. [2022-03-20 18:15:19,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-20 18:15:19,346 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:19,347 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:19,347 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-03-20 18:15:19,347 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:19,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:19,348 INFO L85 PathProgramCache]: Analyzing trace with hash 297853571, now seen corresponding path program 1 times [2022-03-20 18:15:19,348 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:19,349 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [508688912] [2022-03-20 18:15:19,349 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:15:19,349 INFO L85 PathProgramCache]: Analyzing trace with hash 297853571, now seen corresponding path program 2 times [2022-03-20 18:15:19,350 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:19,350 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1857986799] [2022-03-20 18:15:19,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:19,350 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:19,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:19,384 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:19,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:19,391 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-20 18:15:19,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:19,398 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:19,398 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:19,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1857986799] [2022-03-20 18:15:19,399 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1857986799] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:19,399 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:19,399 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 18:15:19,399 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:19,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [508688912] [2022-03-20 18:15:19,400 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [508688912] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:19,401 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:19,401 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 18:15:19,401 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [191881628] [2022-03-20 18:15:19,401 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:19,402 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-20 18:15:19,404 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:19,404 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-20 18:15:19,404 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-20 18:15:19,405 INFO L87 Difference]: Start difference. First operand 162 states and 252 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:19,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:19,512 INFO L93 Difference]: Finished difference Result 329 states and 524 transitions. [2022-03-20 18:15:19,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-20 18:15:19,513 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2022-03-20 18:15:19,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:19,515 INFO L225 Difference]: With dead ends: 329 [2022-03-20 18:15:19,515 INFO L226 Difference]: Without dead ends: 239 [2022-03-20 18:15:19,519 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-03-20 18:15:19,519 INFO L913 BasicCegarLoop]: 56 mSDtfsCounter, 39 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:19,520 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 63 Invalid, 125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:15:19,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2022-03-20 18:15:19,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 209. [2022-03-20 18:15:19,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 95 states have (on average 1.3578947368421053) internal successors, (129), 101 states have internal predecessors, (129), 104 states have call successors, (104), 10 states have call predecessors, (104), 9 states have return successors, (103), 97 states have call predecessors, (103), 103 states have call successors, (103) [2022-03-20 18:15:19,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 336 transitions. [2022-03-20 18:15:19,558 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 336 transitions. Word has length 20 [2022-03-20 18:15:19,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:19,560 INFO L478 AbstractCegarLoop]: Abstraction has 209 states and 336 transitions. [2022-03-20 18:15:19,560 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:19,560 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 336 transitions. [2022-03-20 18:15:19,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-20 18:15:19,562 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:19,562 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:19,562 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-03-20 18:15:19,562 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:19,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:19,562 INFO L85 PathProgramCache]: Analyzing trace with hash 288094237, now seen corresponding path program 1 times [2022-03-20 18:15:19,562 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:19,562 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [660892613] [2022-03-20 18:15:19,563 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:15:19,563 INFO L85 PathProgramCache]: Analyzing trace with hash 288094237, now seen corresponding path program 2 times [2022-03-20 18:15:19,563 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:19,563 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [304187889] [2022-03-20 18:15:19,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:19,563 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:19,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:19,615 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:19,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:19,618 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-20 18:15:19,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:19,620 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-03-20 18:15:19,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:19,623 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 18:15:19,623 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:19,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [304187889] [2022-03-20 18:15:19,623 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [304187889] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:19,623 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:19,624 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:19,624 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:19,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [660892613] [2022-03-20 18:15:19,624 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [660892613] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:19,624 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:19,624 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:19,624 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067745414] [2022-03-20 18:15:19,624 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:19,624 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 18:15:19,624 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:19,625 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 18:15:19,625 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-03-20 18:15:19,625 INFO L87 Difference]: Start difference. First operand 209 states and 336 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 18:15:19,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:19,888 INFO L93 Difference]: Finished difference Result 275 states and 448 transitions. [2022-03-20 18:15:19,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 18:15:19,889 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2022-03-20 18:15:19,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:19,891 INFO L225 Difference]: With dead ends: 275 [2022-03-20 18:15:19,891 INFO L226 Difference]: Without dead ends: 273 [2022-03-20 18:15:19,892 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2022-03-20 18:15:19,892 INFO L913 BasicCegarLoop]: 39 mSDtfsCounter, 81 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 339 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 445 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 339 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:19,892 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 61 Invalid, 445 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 339 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:15:19,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2022-03-20 18:15:19,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 249. [2022-03-20 18:15:19,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 114 states have (on average 1.3859649122807018) internal successors, (158), 124 states have internal predecessors, (158), 124 states have call successors, (124), 11 states have call predecessors, (124), 10 states have return successors, (123), 113 states have call predecessors, (123), 123 states have call successors, (123) [2022-03-20 18:15:19,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 405 transitions. [2022-03-20 18:15:19,954 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 405 transitions. Word has length 27 [2022-03-20 18:15:19,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:19,954 INFO L478 AbstractCegarLoop]: Abstraction has 249 states and 405 transitions. [2022-03-20 18:15:19,954 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 18:15:19,954 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 405 transitions. [2022-03-20 18:15:19,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-20 18:15:19,955 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:19,955 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:19,955 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-03-20 18:15:19,955 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:19,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:19,956 INFO L85 PathProgramCache]: Analyzing trace with hash -870562259, now seen corresponding path program 1 times [2022-03-20 18:15:19,956 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:19,956 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [89797197] [2022-03-20 18:15:19,956 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 18:15:19,956 INFO L85 PathProgramCache]: Analyzing trace with hash -870562259, now seen corresponding path program 2 times [2022-03-20 18:15:19,956 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:19,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [820912978] [2022-03-20 18:15:19,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:19,957 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:19,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:19,982 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:19,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:19,985 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-20 18:15:19,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:19,988 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-03-20 18:15:19,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:19,992 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 18:15:19,992 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:19,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [820912978] [2022-03-20 18:15:19,993 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [820912978] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:19,993 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:19,993 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:15:19,993 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:19,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [89797197] [2022-03-20 18:15:19,993 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [89797197] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:19,993 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:19,993 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:15:19,993 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966643674] [2022-03-20 18:15:19,993 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:19,994 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 18:15:19,994 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:19,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 18:15:19,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-03-20 18:15:19,994 INFO L87 Difference]: Start difference. First operand 249 states and 405 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 18:15:20,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:20,289 INFO L93 Difference]: Finished difference Result 593 states and 971 transitions. [2022-03-20 18:15:20,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 18:15:20,289 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2022-03-20 18:15:20,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:20,293 INFO L225 Difference]: With dead ends: 593 [2022-03-20 18:15:20,293 INFO L226 Difference]: Without dead ends: 396 [2022-03-20 18:15:20,294 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2022-03-20 18:15:20,294 INFO L913 BasicCegarLoop]: 41 mSDtfsCounter, 101 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 255 mSolverCounterSat, 218 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 473 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 218 IncrementalHoareTripleChecker+Valid, 255 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:20,295 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 53 Invalid, 473 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [218 Valid, 255 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:15:20,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 396 states. [2022-03-20 18:15:20,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 396 to 250. [2022-03-20 18:15:20,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 250 states, 115 states have (on average 1.373913043478261) internal successors, (158), 125 states have internal predecessors, (158), 124 states have call successors, (124), 11 states have call predecessors, (124), 10 states have return successors, (123), 113 states have call predecessors, (123), 123 states have call successors, (123) [2022-03-20 18:15:20,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 405 transitions. [2022-03-20 18:15:20,344 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 405 transitions. Word has length 29 [2022-03-20 18:15:20,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:20,345 INFO L478 AbstractCegarLoop]: Abstraction has 250 states and 405 transitions. [2022-03-20 18:15:20,345 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 18:15:20,345 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 405 transitions. [2022-03-20 18:15:20,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-03-20 18:15:20,347 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:20,347 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:20,347 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-03-20 18:15:20,347 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:20,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:20,348 INFO L85 PathProgramCache]: Analyzing trace with hash -1319777776, now seen corresponding path program 1 times [2022-03-20 18:15:20,348 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:20,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1945731803] [2022-03-20 18:15:20,348 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:15:20,348 INFO L85 PathProgramCache]: Analyzing trace with hash -1319777776, now seen corresponding path program 2 times [2022-03-20 18:15:20,348 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:20,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1071506213] [2022-03-20 18:15:20,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:20,349 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:20,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:20,397 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:20,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:20,402 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-20 18:15:20,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:20,406 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-03-20 18:15:20,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:20,409 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-03-20 18:15:20,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:20,418 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 18:15:20,418 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:20,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1071506213] [2022-03-20 18:15:20,418 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1071506213] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:20,418 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:20,418 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:20,419 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:20,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1945731803] [2022-03-20 18:15:20,419 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1945731803] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:20,419 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:20,419 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:20,419 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [142596576] [2022-03-20 18:15:20,419 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:20,419 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 18:15:20,419 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:20,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 18:15:20,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-03-20 18:15:20,420 INFO L87 Difference]: Start difference. First operand 250 states and 405 transitions. Second operand has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-20 18:15:20,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:20,680 INFO L93 Difference]: Finished difference Result 324 states and 521 transitions. [2022-03-20 18:15:20,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 18:15:20,681 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 30 [2022-03-20 18:15:20,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:20,684 INFO L225 Difference]: With dead ends: 324 [2022-03-20 18:15:20,684 INFO L226 Difference]: Without dead ends: 322 [2022-03-20 18:15:20,685 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2022-03-20 18:15:20,685 INFO L913 BasicCegarLoop]: 53 mSDtfsCounter, 46 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 288 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 374 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 288 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:20,685 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 75 Invalid, 374 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 288 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:15:20,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2022-03-20 18:15:20,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 300. [2022-03-20 18:15:20,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 300 states, 133 states have (on average 1.368421052631579) internal successors, (182), 149 states have internal predecessors, (182), 154 states have call successors, (154), 13 states have call predecessors, (154), 12 states have return successors, (153), 137 states have call predecessors, (153), 153 states have call successors, (153) [2022-03-20 18:15:20,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 489 transitions. [2022-03-20 18:15:20,735 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 489 transitions. Word has length 30 [2022-03-20 18:15:20,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:20,735 INFO L478 AbstractCegarLoop]: Abstraction has 300 states and 489 transitions. [2022-03-20 18:15:20,736 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-20 18:15:20,736 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 489 transitions. [2022-03-20 18:15:20,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-20 18:15:20,737 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:20,737 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:20,737 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-03-20 18:15:20,737 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:20,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:20,737 INFO L85 PathProgramCache]: Analyzing trace with hash 1828949766, now seen corresponding path program 1 times [2022-03-20 18:15:20,738 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:20,738 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2100267068] [2022-03-20 18:15:20,740 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:15:20,740 INFO L85 PathProgramCache]: Analyzing trace with hash 1828949766, now seen corresponding path program 2 times [2022-03-20 18:15:20,740 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:20,740 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1260296030] [2022-03-20 18:15:20,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:20,740 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 18:15:20,786 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:20,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:20,789 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-20 18:15:20,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:20,793 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-03-20 18:15:20,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:20,798 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2022-03-20 18:15:20,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:20,801 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 18:15:20,801 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:20,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1260296030] [2022-03-20 18:15:20,801 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1260296030] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:20,801 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:20,801 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:15:20,802 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:20,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2100267068] [2022-03-20 18:15:20,802 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2100267068] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:20,802 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:20,802 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:15:20,802 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519865644] [2022-03-20 18:15:20,802 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:20,802 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:15:20,802 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:20,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:15:20,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-03-20 18:15:20,803 INFO L87 Difference]: Start difference. First operand 300 states and 489 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-20 18:15:21,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:21,154 INFO L93 Difference]: Finished difference Result 470 states and 788 transitions. [2022-03-20 18:15:21,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 18:15:21,155 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 32 [2022-03-20 18:15:21,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:21,157 INFO L225 Difference]: With dead ends: 470 [2022-03-20 18:15:21,158 INFO L226 Difference]: Without dead ends: 468 [2022-03-20 18:15:21,158 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2022-03-20 18:15:21,158 INFO L913 BasicCegarLoop]: 49 mSDtfsCounter, 104 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 405 mSolverCounterSat, 153 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 558 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 153 IncrementalHoareTripleChecker+Valid, 405 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:21,158 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 76 Invalid, 558 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [153 Valid, 405 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:15:21,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 468 states. [2022-03-20 18:15:21,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 468 to 422. [2022-03-20 18:15:21,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 422 states, 179 states have (on average 1.4022346368715084) internal successors, (251), 206 states have internal predecessors, (251), 229 states have call successors, (229), 14 states have call predecessors, (229), 13 states have return successors, (228), 201 states have call predecessors, (228), 228 states have call successors, (228) [2022-03-20 18:15:21,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 422 states to 422 states and 708 transitions. [2022-03-20 18:15:21,225 INFO L78 Accepts]: Start accepts. Automaton has 422 states and 708 transitions. Word has length 32 [2022-03-20 18:15:21,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:21,226 INFO L478 AbstractCegarLoop]: Abstraction has 422 states and 708 transitions. [2022-03-20 18:15:21,226 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-20 18:15:21,226 INFO L276 IsEmpty]: Start isEmpty. Operand 422 states and 708 transitions. [2022-03-20 18:15:21,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-20 18:15:21,226 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:21,226 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:21,226 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-03-20 18:15:21,226 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:21,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:21,227 INFO L85 PathProgramCache]: Analyzing trace with hash 1969498376, now seen corresponding path program 1 times [2022-03-20 18:15:21,227 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:21,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [844166886] [2022-03-20 18:15:21,227 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:15:21,227 INFO L85 PathProgramCache]: Analyzing trace with hash 1969498376, now seen corresponding path program 2 times [2022-03-20 18:15:21,227 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:21,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1979732882] [2022-03-20 18:15:21,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:21,228 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:21,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:21,259 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:21,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:21,263 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-20 18:15:21,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:21,265 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-03-20 18:15:21,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:21,273 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2022-03-20 18:15:21,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:21,275 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 18:15:21,275 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:21,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1979732882] [2022-03-20 18:15:21,276 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1979732882] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:21,276 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:21,276 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:15:21,276 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:21,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [844166886] [2022-03-20 18:15:21,276 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [844166886] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:21,276 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:21,276 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:15:21,276 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325553037] [2022-03-20 18:15:21,276 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:21,276 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:15:21,277 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:21,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:15:21,277 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-03-20 18:15:21,277 INFO L87 Difference]: Start difference. First operand 422 states and 708 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-20 18:15:21,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:21,557 INFO L93 Difference]: Finished difference Result 489 states and 817 transitions. [2022-03-20 18:15:21,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 18:15:21,558 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 32 [2022-03-20 18:15:21,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:21,560 INFO L225 Difference]: With dead ends: 489 [2022-03-20 18:15:21,560 INFO L226 Difference]: Without dead ends: 487 [2022-03-20 18:15:21,561 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2022-03-20 18:15:21,561 INFO L913 BasicCegarLoop]: 39 mSDtfsCounter, 109 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 272 mSolverCounterSat, 138 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 410 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 138 IncrementalHoareTripleChecker+Valid, 272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:21,561 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 66 Invalid, 410 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [138 Valid, 272 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:15:21,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 487 states. [2022-03-20 18:15:21,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 487 to 429. [2022-03-20 18:15:21,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 429 states, 182 states have (on average 1.3956043956043955) internal successors, (254), 209 states have internal predecessors, (254), 232 states have call successors, (232), 15 states have call predecessors, (232), 14 states have return successors, (231), 204 states have call predecessors, (231), 231 states have call successors, (231) [2022-03-20 18:15:21,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 429 states to 429 states and 717 transitions. [2022-03-20 18:15:21,635 INFO L78 Accepts]: Start accepts. Automaton has 429 states and 717 transitions. Word has length 32 [2022-03-20 18:15:21,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:21,635 INFO L478 AbstractCegarLoop]: Abstraction has 429 states and 717 transitions. [2022-03-20 18:15:21,635 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-20 18:15:21,635 INFO L276 IsEmpty]: Start isEmpty. Operand 429 states and 717 transitions. [2022-03-20 18:15:21,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-20 18:15:21,636 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:21,636 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:21,636 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-03-20 18:15:21,636 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:21,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:21,636 INFO L85 PathProgramCache]: Analyzing trace with hash 154781133, now seen corresponding path program 1 times [2022-03-20 18:15:21,636 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:21,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [106385062] [2022-03-20 18:15:21,637 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:15:21,637 INFO L85 PathProgramCache]: Analyzing trace with hash 154781133, now seen corresponding path program 2 times [2022-03-20 18:15:21,637 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:21,637 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [824022840] [2022-03-20 18:15:21,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:21,637 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:21,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:21,673 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:21,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:21,676 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-20 18:15:21,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:21,678 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-03-20 18:15:21,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:21,680 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-03-20 18:15:21,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:21,682 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2022-03-20 18:15:21,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:21,683 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2022-03-20 18:15:21,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:21,688 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-03-20 18:15:21,688 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:21,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [824022840] [2022-03-20 18:15:21,688 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [824022840] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:21,688 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:21,688 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:15:21,688 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:21,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [106385062] [2022-03-20 18:15:21,689 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [106385062] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:21,689 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:21,689 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:15:21,689 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337545589] [2022-03-20 18:15:21,689 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:21,689 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:15:21,689 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:21,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:15:21,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-03-20 18:15:21,689 INFO L87 Difference]: Start difference. First operand 429 states and 717 transitions. Second operand has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 3 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-03-20 18:15:21,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:21,990 INFO L93 Difference]: Finished difference Result 484 states and 791 transitions. [2022-03-20 18:15:21,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 18:15:21,990 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 3 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 42 [2022-03-20 18:15:21,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:21,992 INFO L225 Difference]: With dead ends: 484 [2022-03-20 18:15:21,992 INFO L226 Difference]: Without dead ends: 482 [2022-03-20 18:15:21,993 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2022-03-20 18:15:21,993 INFO L913 BasicCegarLoop]: 55 mSDtfsCounter, 57 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 323 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 444 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 323 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:21,993 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 77 Invalid, 444 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 323 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:15:21,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 482 states. [2022-03-20 18:15:22,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 482 to 433. [2022-03-20 18:15:22,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 433 states, 185 states have (on average 1.3891891891891892) internal successors, (257), 212 states have internal predecessors, (257), 232 states have call successors, (232), 16 states have call predecessors, (232), 15 states have return successors, (231), 204 states have call predecessors, (231), 231 states have call successors, (231) [2022-03-20 18:15:22,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 720 transitions. [2022-03-20 18:15:22,064 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 720 transitions. Word has length 42 [2022-03-20 18:15:22,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:22,064 INFO L478 AbstractCegarLoop]: Abstraction has 433 states and 720 transitions. [2022-03-20 18:15:22,064 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 3 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-03-20 18:15:22,064 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 720 transitions. [2022-03-20 18:15:22,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-20 18:15:22,065 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:22,065 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:22,065 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-03-20 18:15:22,065 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:22,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:22,066 INFO L85 PathProgramCache]: Analyzing trace with hash -756625364, now seen corresponding path program 1 times [2022-03-20 18:15:22,066 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:22,066 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1924410088] [2022-03-20 18:15:22,066 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 18:15:22,066 INFO L85 PathProgramCache]: Analyzing trace with hash -756625364, now seen corresponding path program 2 times [2022-03-20 18:15:22,066 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:22,066 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476489158] [2022-03-20 18:15:22,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:22,066 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:22,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:22,099 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:22,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:22,101 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-20 18:15:22,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:22,102 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-03-20 18:15:22,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:22,104 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2022-03-20 18:15:22,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:22,106 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2022-03-20 18:15:22,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:22,108 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-03-20 18:15:22,108 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:22,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476489158] [2022-03-20 18:15:22,108 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1476489158] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:22,108 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:22,108 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:15:22,108 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:22,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1924410088] [2022-03-20 18:15:22,108 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1924410088] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:22,108 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:22,109 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:15:22,109 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84265549] [2022-03-20 18:15:22,109 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:22,109 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:15:22,109 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:22,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:15:22,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-03-20 18:15:22,109 INFO L87 Difference]: Start difference. First operand 433 states and 720 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 18:15:22,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:22,326 INFO L93 Difference]: Finished difference Result 440 states and 726 transitions. [2022-03-20 18:15:22,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 18:15:22,327 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 42 [2022-03-20 18:15:22,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:22,329 INFO L225 Difference]: With dead ends: 440 [2022-03-20 18:15:22,329 INFO L226 Difference]: Without dead ends: 438 [2022-03-20 18:15:22,330 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2022-03-20 18:15:22,330 INFO L913 BasicCegarLoop]: 30 mSDtfsCounter, 54 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 278 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:22,330 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 52 Invalid, 278 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:15:22,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 438 states. [2022-03-20 18:15:22,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 438 to 437. [2022-03-20 18:15:22,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 437 states, 188 states have (on average 1.3829787234042554) internal successors, (260), 215 states have internal predecessors, (260), 232 states have call successors, (232), 17 states have call predecessors, (232), 16 states have return successors, (231), 204 states have call predecessors, (231), 231 states have call successors, (231) [2022-03-20 18:15:22,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 437 states to 437 states and 723 transitions. [2022-03-20 18:15:22,417 INFO L78 Accepts]: Start accepts. Automaton has 437 states and 723 transitions. Word has length 42 [2022-03-20 18:15:22,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:22,418 INFO L478 AbstractCegarLoop]: Abstraction has 437 states and 723 transitions. [2022-03-20 18:15:22,418 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 18:15:22,418 INFO L276 IsEmpty]: Start isEmpty. Operand 437 states and 723 transitions. [2022-03-20 18:15:22,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-03-20 18:15:22,419 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:22,419 INFO L499 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:22,419 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-03-20 18:15:22,419 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:22,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:22,419 INFO L85 PathProgramCache]: Analyzing trace with hash 202086614, now seen corresponding path program 1 times [2022-03-20 18:15:22,419 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:22,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1434085253] [2022-03-20 18:15:22,420 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 18:15:22,420 INFO L85 PathProgramCache]: Analyzing trace with hash 202086614, now seen corresponding path program 2 times [2022-03-20 18:15:22,420 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:22,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [59723674] [2022-03-20 18:15:22,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:22,420 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:22,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:22,452 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:22,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:22,455 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-20 18:15:22,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:22,457 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-03-20 18:15:22,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:22,458 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2022-03-20 18:15:22,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:22,460 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2022-03-20 18:15:22,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:22,463 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2022-03-20 18:15:22,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:22,465 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2022-03-20 18:15:22,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:22,467 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2022-03-20 18:15:22,467 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:22,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [59723674] [2022-03-20 18:15:22,467 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [59723674] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:22,467 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:22,467 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:15:22,468 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:22,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1434085253] [2022-03-20 18:15:22,468 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1434085253] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:22,468 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:22,468 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:15:22,468 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600933688] [2022-03-20 18:15:22,468 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:22,468 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:15:22,468 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:22,468 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:15:22,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-03-20 18:15:22,469 INFO L87 Difference]: Start difference. First operand 437 states and 723 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 6 states have internal predecessors, (23), 3 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-20 18:15:22,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:22,747 INFO L93 Difference]: Finished difference Result 501 states and 826 transitions. [2022-03-20 18:15:22,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 18:15:22,747 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 6 states have internal predecessors, (23), 3 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 54 [2022-03-20 18:15:22,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:22,750 INFO L225 Difference]: With dead ends: 501 [2022-03-20 18:15:22,750 INFO L226 Difference]: Without dead ends: 499 [2022-03-20 18:15:22,750 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2022-03-20 18:15:22,751 INFO L913 BasicCegarLoop]: 39 mSDtfsCounter, 80 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 315 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 421 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 315 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:22,751 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 66 Invalid, 421 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 315 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:15:22,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 499 states. [2022-03-20 18:15:22,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 499 to 441. [2022-03-20 18:15:22,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 441 states, 191 states have (on average 1.3769633507853403) internal successors, (263), 218 states have internal predecessors, (263), 232 states have call successors, (232), 18 states have call predecessors, (232), 17 states have return successors, (231), 204 states have call predecessors, (231), 231 states have call successors, (231) [2022-03-20 18:15:22,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 726 transitions. [2022-03-20 18:15:22,832 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 726 transitions. Word has length 54 [2022-03-20 18:15:22,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:22,832 INFO L478 AbstractCegarLoop]: Abstraction has 441 states and 726 transitions. [2022-03-20 18:15:22,832 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 6 states have internal predecessors, (23), 3 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-20 18:15:22,832 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 726 transitions. [2022-03-20 18:15:22,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-03-20 18:15:22,833 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:22,833 INFO L499 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:22,833 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-03-20 18:15:22,833 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:22,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:22,834 INFO L85 PathProgramCache]: Analyzing trace with hash -667500302, now seen corresponding path program 1 times [2022-03-20 18:15:22,834 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:22,834 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [645374915] [2022-03-20 18:15:22,957 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:22,958 INFO L85 PathProgramCache]: Analyzing trace with hash -544810282, now seen corresponding path program 1 times [2022-03-20 18:15:22,958 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:22,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1460865890] [2022-03-20 18:15:22,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:22,958 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:22,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:22,990 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:22,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:22,994 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2022-03-20 18:15:22,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:22,997 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 18:15:22,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:22,999 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 18:15:23,000 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:23,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1460865890] [2022-03-20 18:15:23,000 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1460865890] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:23,000 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:23,000 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:23,470 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:23,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [645374915] [2022-03-20 18:15:23,470 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [645374915] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:23,470 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:23,470 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-03-20 18:15:23,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526290017] [2022-03-20 18:15:23,470 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:23,470 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-20 18:15:23,470 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:23,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-20 18:15:23,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=549, Unknown=0, NotChecked=0, Total=650 [2022-03-20 18:15:23,471 INFO L87 Difference]: Start difference. First operand 441 states and 726 transitions. Second operand has 26 states, 23 states have (on average 1.434782608695652) internal successors, (33), 18 states have internal predecessors, (33), 6 states have call successors, (11), 7 states have call predecessors, (11), 5 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2022-03-20 18:15:25,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:25,695 INFO L93 Difference]: Finished difference Result 806 states and 1284 transitions. [2022-03-20 18:15:25,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-03-20 18:15:25,707 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 23 states have (on average 1.434782608695652) internal successors, (33), 18 states have internal predecessors, (33), 6 states have call successors, (11), 7 states have call predecessors, (11), 5 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) Word has length 62 [2022-03-20 18:15:25,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:25,711 INFO L225 Difference]: With dead ends: 806 [2022-03-20 18:15:25,711 INFO L226 Difference]: Without dead ends: 804 [2022-03-20 18:15:25,713 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 33 SyntacticMatches, 6 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1626 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=737, Invalid=4233, Unknown=0, NotChecked=0, Total=4970 [2022-03-20 18:15:25,713 INFO L913 BasicCegarLoop]: 119 mSDtfsCounter, 151 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 2687 mSolverCounterSat, 612 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 3633 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 612 IncrementalHoareTripleChecker+Valid, 2687 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 334 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:25,713 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [155 Valid, 203 Invalid, 3633 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [612 Valid, 2687 Invalid, 0 Unknown, 334 Unchecked, 1.3s Time] [2022-03-20 18:15:25,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 804 states. [2022-03-20 18:15:25,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 804 to 595. [2022-03-20 18:15:25,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 595 states, 261 states have (on average 1.3754789272030652) internal successors, (359), 296 states have internal predecessors, (359), 310 states have call successors, (310), 25 states have call predecessors, (310), 23 states have return successors, (309), 273 states have call predecessors, (309), 309 states have call successors, (309) [2022-03-20 18:15:25,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 595 states to 595 states and 978 transitions. [2022-03-20 18:15:25,828 INFO L78 Accepts]: Start accepts. Automaton has 595 states and 978 transitions. Word has length 62 [2022-03-20 18:15:25,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:25,829 INFO L478 AbstractCegarLoop]: Abstraction has 595 states and 978 transitions. [2022-03-20 18:15:25,829 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 23 states have (on average 1.434782608695652) internal successors, (33), 18 states have internal predecessors, (33), 6 states have call successors, (11), 7 states have call predecessors, (11), 5 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2022-03-20 18:15:25,829 INFO L276 IsEmpty]: Start isEmpty. Operand 595 states and 978 transitions. [2022-03-20 18:15:25,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-03-20 18:15:25,830 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:25,830 INFO L499 BasicCegarLoop]: trace histogram [10, 9, 9, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:25,830 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-03-20 18:15:25,830 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:25,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:25,830 INFO L85 PathProgramCache]: Analyzing trace with hash 820904785, now seen corresponding path program 2 times [2022-03-20 18:15:25,831 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:25,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [878153919] [2022-03-20 18:15:25,900 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:25,900 INFO L85 PathProgramCache]: Analyzing trace with hash -163788755, now seen corresponding path program 1 times [2022-03-20 18:15:25,900 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:25,900 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [548695066] [2022-03-20 18:15:25,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:25,900 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:25,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:25,966 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:25,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:25,971 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2022-03-20 18:15:25,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:25,973 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 18:15:25,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:25,975 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2022-03-20 18:15:25,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:25,977 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 18:15:25,977 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:25,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [548695066] [2022-03-20 18:15:25,977 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [548695066] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:25,977 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:25,977 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:15:26,431 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:26,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [878153919] [2022-03-20 18:15:26,432 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [878153919] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:26,432 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:26,432 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-03-20 18:15:26,432 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983449415] [2022-03-20 18:15:26,432 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:26,432 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-03-20 18:15:26,432 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:26,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-03-20 18:15:26,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=639, Unknown=0, NotChecked=0, Total=756 [2022-03-20 18:15:26,433 INFO L87 Difference]: Start difference. First operand 595 states and 978 transitions. Second operand has 28 states, 24 states have (on average 1.375) internal successors, (33), 19 states have internal predecessors, (33), 7 states have call successors, (12), 7 states have call predecessors, (12), 5 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2022-03-20 18:15:29,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:29,290 INFO L93 Difference]: Finished difference Result 1371 states and 2257 transitions. [2022-03-20 18:15:29,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2022-03-20 18:15:29,291 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 24 states have (on average 1.375) internal successors, (33), 19 states have internal predecessors, (33), 7 states have call successors, (12), 7 states have call predecessors, (12), 5 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) Word has length 67 [2022-03-20 18:15:29,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:29,292 INFO L225 Difference]: With dead ends: 1371 [2022-03-20 18:15:29,292 INFO L226 Difference]: Without dead ends: 0 [2022-03-20 18:15:29,299 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 33 SyntacticMatches, 6 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2333 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1094, Invalid=6046, Unknown=0, NotChecked=0, Total=7140 [2022-03-20 18:15:29,300 INFO L913 BasicCegarLoop]: 84 mSDtfsCounter, 230 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 2338 mSolverCounterSat, 930 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 232 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 3564 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 930 IncrementalHoareTripleChecker+Valid, 2338 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 296 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:29,300 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [232 Valid, 174 Invalid, 3564 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [930 Valid, 2338 Invalid, 0 Unknown, 296 Unchecked, 1.4s Time] [2022-03-20 18:15:29,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2022-03-20 18:15:29,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2022-03-20 18:15:29,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-03-20 18:15:29,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2022-03-20 18:15:29,301 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 67 [2022-03-20 18:15:29,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:29,301 INFO L478 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2022-03-20 18:15:29,301 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 24 states have (on average 1.375) internal successors, (33), 19 states have internal predecessors, (33), 7 states have call successors, (12), 7 states have call predecessors, (12), 5 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2022-03-20 18:15:29,302 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2022-03-20 18:15:29,302 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2022-03-20 18:15:29,304 INFO L788 garLoopResultBuilder]: Registering result SAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-03-20 18:15:29,304 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2022-03-20 18:15:29,306 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2022-03-20 18:15:39,510 WARN L232 SmtUtils]: Spent 10.19s on a formula simplification that was a NOOP. DAG size: 278 (called from [L 182] de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.HoareAnnotationComposer.or) [2022-03-20 18:20:54,790 WARN L232 SmtUtils]: Spent 5.25m on a formula simplification. DAG size of input: 95 DAG size of output: 94 (called from [L 182] de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.HoareAnnotationComposer.or)