/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-d966a43 [2022-01-31 20:53:11,343 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-01-31 20:53:11,345 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-01-31 20:53:11,401 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-01-31 20:53:11,426 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-01-31 20:53:11,426 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-01-31 20:53:11,427 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-01-31 20:53:11,428 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-01-31 20:53:11,429 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-01-31 20:53:11,429 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-01-31 20:53:11,431 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-01-31 20:53:11,432 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-01-31 20:53:11,433 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-01-31 20:53:11,434 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-01-31 20:53:11,435 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-01-31 20:53:11,436 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-01-31 20:53:11,437 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2022-01-31 20:53:11,443 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-01-31 20:53:11,444 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-01-31 20:53:11,445 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-01-31 20:53:11,446 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2022-01-31 20:53:11,452 INFO L113 SettingsManager]: Loading preferences was successful [2022-01-31 20:53:11,453 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-01-31 20:53:11,454 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-01-31 20:53:11,454 INFO L138 SettingsManager]: * sizeof long=4 [2022-01-31 20:53:11,454 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-01-31 20:53:11,454 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-01-31 20:53:11,455 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-01-31 20:53:11,455 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-01-31 20:53:11,455 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-01-31 20:53:11,455 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-01-31 20:53:11,455 INFO L138 SettingsManager]: * sizeof long double=12 [2022-01-31 20:53:11,455 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-01-31 20:53:11,456 INFO L138 SettingsManager]: * Use constant arrays=true [2022-01-31 20:53:11,456 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-01-31 20:53:11,456 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-01-31 20:53:11,456 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-01-31 20:53:11,456 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-01-31 20:53:11,456 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-01-31 20:53:11,457 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-31 20:53:11,457 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-01-31 20:53:11,457 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2022-01-31 20:53:11,457 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-01-31 20:53:11,457 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-01-31 20:53:11,457 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-01-31 20:53:11,657 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-01-31 20:53:11,672 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-01-31 20:53:11,673 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-01-31 20:53:11,674 INFO L271 PluginConnector]: Initializing CDTParser... [2022-01-31 20:53:11,675 INFO L275 PluginConnector]: CDTParser initialized [2022-01-31 20:53:11,676 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2022-01-31 20:53:11,740 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e0e6e8e28/b3aa5259d7b640b9adb8a2303f7a32cc/FLAG25e56550e [2022-01-31 20:53:12,088 INFO L306 CDTParser]: Found 1 translation units. [2022-01-31 20:53:12,089 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2022-01-31 20:53:12,093 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e0e6e8e28/b3aa5259d7b640b9adb8a2303f7a32cc/FLAG25e56550e [2022-01-31 20:53:12,106 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e0e6e8e28/b3aa5259d7b640b9adb8a2303f7a32cc [2022-01-31 20:53:12,108 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-01-31 20:53:12,109 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-01-31 20:53:12,111 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-01-31 20:53:12,111 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-01-31 20:53:12,114 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-01-31 20:53:12,114 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 08:53:12" (1/1) ... [2022-01-31 20:53:12,115 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@471a74f3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 08:53:12, skipping insertion in model container [2022-01-31 20:53:12,115 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 08:53:12" (1/1) ... [2022-01-31 20:53:12,121 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-01-31 20:53:12,130 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-01-31 20:53:12,240 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-acceleration/underapprox_2-1.c[327,340] [2022-01-31 20:53:12,254 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-31 20:53:12,260 INFO L203 MainTranslator]: Completed pre-run [2022-01-31 20:53:12,279 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-acceleration/underapprox_2-1.c[327,340] [2022-01-31 20:53:12,284 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-31 20:53:12,294 INFO L208 MainTranslator]: Completed translation [2022-01-31 20:53:12,295 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 08:53:12 WrapperNode [2022-01-31 20:53:12,295 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-01-31 20:53:12,296 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-01-31 20:53:12,296 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-01-31 20:53:12,296 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-01-31 20:53:12,333 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 08:53:12" (1/1) ... [2022-01-31 20:53:12,333 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 08:53:12" (1/1) ... [2022-01-31 20:53:12,343 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 08:53:12" (1/1) ... [2022-01-31 20:53:12,343 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 08:53:12" (1/1) ... [2022-01-31 20:53:12,346 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 08:53:12" (1/1) ... [2022-01-31 20:53:12,349 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 08:53:12" (1/1) ... [2022-01-31 20:53:12,350 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 08:53:12" (1/1) ... [2022-01-31 20:53:12,351 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-01-31 20:53:12,352 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-01-31 20:53:12,352 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-01-31 20:53:12,352 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-01-31 20:53:12,353 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 08:53:12" (1/1) ... [2022-01-31 20:53:12,368 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-31 20:53:12,380 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 20:53:12,396 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) [2022-01-31 20:53:12,415 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 [2022-01-31 20:53:12,435 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-01-31 20:53:12,435 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-01-31 20:53:12,435 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-01-31 20:53:12,435 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-01-31 20:53:12,435 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-01-31 20:53:12,435 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-01-31 20:53:12,435 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-01-31 20:53:12,436 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-01-31 20:53:12,436 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-01-31 20:53:12,436 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-01-31 20:53:12,436 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-01-31 20:53:12,436 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-01-31 20:53:12,436 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-01-31 20:53:12,436 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-01-31 20:53:12,436 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-01-31 20:53:12,436 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-01-31 20:53:12,437 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-01-31 20:53:12,488 INFO L234 CfgBuilder]: Building ICFG [2022-01-31 20:53:12,489 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-01-31 20:53:12,546 INFO L275 CfgBuilder]: Performing block encoding [2022-01-31 20:53:12,550 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-01-31 20:53:12,550 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-01-31 20:53:12,552 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 08:53:12 BoogieIcfgContainer [2022-01-31 20:53:12,552 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-01-31 20:53:12,554 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-01-31 20:53:12,554 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-01-31 20:53:12,557 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-01-31 20:53:12,557 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.01 08:53:12" (1/3) ... [2022-01-31 20:53:12,557 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f648411 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 08:53:12, skipping insertion in model container [2022-01-31 20:53:12,558 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 08:53:12" (2/3) ... [2022-01-31 20:53:12,558 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f648411 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 08:53:12, skipping insertion in model container [2022-01-31 20:53:12,558 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 08:53:12" (3/3) ... [2022-01-31 20:53:12,559 INFO L111 eAbstractionObserver]: Analyzing ICFG underapprox_2-1.c [2022-01-31 20:53:12,563 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-01-31 20:53:12,563 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-01-31 20:53:12,601 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-01-31 20:53:12,608 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=AcceleratedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=JORDAN [2022-01-31 20:53:12,608 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-01-31 20:53:12,619 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-31 20:53:12,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-01-31 20:53:12,625 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 20:53:12,625 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 20:53:12,625 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 20:53:12,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 20:53:12,630 INFO L85 PathProgramCache]: Analyzing trace with hash -219174432, now seen corresponding path program 1 times [2022-01-31 20:53:12,637 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 20:53:12,637 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [339519735] [2022-01-31 20:53:12,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 20:53:12,648 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 20:53:12,689 INFO L248 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-01-31 20:53:12,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 20:53:12,759 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 20:53:12,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 20:53:12,770 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 20:53:12,772 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 20:53:12,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [339519735] [2022-01-31 20:53:12,773 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [339519735] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 20:53:12,773 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 20:53:12,774 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-01-31 20:53:12,775 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73044535] [2022-01-31 20:53:12,775 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 20:53:12,778 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-01-31 20:53:12,778 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 20:53:12,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-01-31 20:53:12,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-01-31 20:53:12,802 INFO L87 Difference]: Start difference. First operand has 18 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 20:53:12,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 20:53:12,830 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2022-01-31 20:53:12,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-01-31 20:53:12,832 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-01-31 20:53:12,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 20:53:12,837 INFO L225 Difference]: With dead ends: 29 [2022-01-31 20:53:12,837 INFO L226 Difference]: Without dead ends: 12 [2022-01-31 20:53:12,839 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-01-31 20:53:12,842 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 9 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 20:53:12,843 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 20 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 20:53:12,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2022-01-31 20:53:12,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2022-01-31 20:53:12,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 20:53:12,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2022-01-31 20:53:12,868 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 11 [2022-01-31 20:53:12,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 20:53:12,868 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2022-01-31 20:53:12,868 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 20:53:12,868 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2022-01-31 20:53:12,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-01-31 20:53:12,869 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 20:53:12,869 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 20:53:12,869 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-01-31 20:53:12,869 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 20:53:12,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 20:53:12,870 INFO L85 PathProgramCache]: Analyzing trace with hash -222868516, now seen corresponding path program 1 times [2022-01-31 20:53:12,870 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 20:53:12,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [778415882] [2022-01-31 20:53:12,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 20:53:12,872 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 20:53:12,873 INFO L248 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-01-31 20:53:12,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 20:53:12,993 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 20:53:12,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 20:53:13,003 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 20:53:13,004 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 20:53:13,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [778415882] [2022-01-31 20:53:13,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [778415882] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 20:53:13,004 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 20:53:13,004 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-01-31 20:53:13,005 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075225525] [2022-01-31 20:53:13,005 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 20:53:13,006 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-01-31 20:53:13,006 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 20:53:13,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-01-31 20:53:13,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-01-31 20:53:13,007 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 20:53:13,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 20:53:13,043 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2022-01-31 20:53:13,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-01-31 20:53:13,043 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-01-31 20:53:13,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 20:53:13,044 INFO L225 Difference]: With dead ends: 18 [2022-01-31 20:53:13,044 INFO L226 Difference]: Without dead ends: 13 [2022-01-31 20:53:13,045 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-01-31 20:53:13,046 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 20:53:13,047 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 28 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 20:53:13,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-01-31 20:53:13,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-01-31 20:53:13,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 20:53:13,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2022-01-31 20:53:13,052 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2022-01-31 20:53:13,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 20:53:13,053 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2022-01-31 20:53:13,053 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 20:53:13,053 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2022-01-31 20:53:13,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-01-31 20:53:13,053 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 20:53:13,054 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 20:53:13,054 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-01-31 20:53:13,054 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 20:53:13,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 20:53:13,055 INFO L85 PathProgramCache]: Analyzing trace with hash 1717471862, now seen corresponding path program 1 times [2022-01-31 20:53:13,055 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 20:53:13,055 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [4895244] [2022-01-31 20:53:13,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 20:53:13,072 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-01-31 20:53:13,072 WARN L89 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-01-31 20:53:13,072 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 20:53:13,074 INFO L248 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-01-31 20:53:13,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 20:53:13,173 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 20:53:13,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 20:53:13,181 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 20:53:13,182 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 20:53:13,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [4895244] [2022-01-31 20:53:13,182 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [4895244] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 20:53:13,182 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 20:53:13,182 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-01-31 20:53:13,183 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313648597] [2022-01-31 20:53:13,183 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 20:53:13,183 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-01-31 20:53:13,183 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 20:53:13,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-01-31 20:53:13,184 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-01-31 20:53:13,184 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand has 7 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 20:53:13,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 20:53:13,232 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2022-01-31 20:53:13,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-01-31 20:53:13,232 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (3), 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 12 [2022-01-31 20:53:13,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 20:53:13,233 INFO L225 Difference]: With dead ends: 19 [2022-01-31 20:53:13,233 INFO L226 Difference]: Without dead ends: 14 [2022-01-31 20:53:13,234 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2022-01-31 20:53:13,235 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 20:53:13,236 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 33 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 20:53:13,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-01-31 20:53:13,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-01-31 20:53:13,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 9 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 20:53:13,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2022-01-31 20:53:13,241 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2022-01-31 20:53:13,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 20:53:13,241 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2022-01-31 20:53:13,241 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 20:53:13,241 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2022-01-31 20:53:13,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-01-31 20:53:13,242 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 20:53:13,242 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 20:53:13,242 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-01-31 20:53:13,242 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 20:53:13,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 20:53:13,243 INFO L85 PathProgramCache]: Analyzing trace with hash 1738481436, now seen corresponding path program 2 times [2022-01-31 20:53:13,243 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 20:53:13,243 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1340315610] [2022-01-31 20:53:13,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 20:53:13,246 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-01-31 20:53:13,247 WARN L89 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-01-31 20:53:13,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 20:53:13,248 INFO L248 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-01-31 20:53:13,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 20:53:13,335 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 20:53:13,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 20:53:13,342 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 20:53:13,343 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 20:53:13,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1340315610] [2022-01-31 20:53:13,343 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1340315610] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 20:53:13,343 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 20:53:13,343 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-01-31 20:53:13,343 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219856130] [2022-01-31 20:53:13,344 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 20:53:13,344 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-01-31 20:53:13,344 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 20:53:13,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-01-31 20:53:13,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2022-01-31 20:53:13,345 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand has 8 states, 8 states have (on average 1.125) internal successors, (9), 6 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 20:53:13,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 20:53:13,402 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2022-01-31 20:53:13,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-01-31 20:53:13,402 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.125) internal successors, (9), 6 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2022-01-31 20:53:13,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 20:53:13,403 INFO L225 Difference]: With dead ends: 20 [2022-01-31 20:53:13,403 INFO L226 Difference]: Without dead ends: 15 [2022-01-31 20:53:13,403 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2022-01-31 20:53:13,404 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 20:53:13,405 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 33 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 20:53:13,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-01-31 20:53:13,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-01-31 20:53:13,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 20:53:13,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2022-01-31 20:53:13,409 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2022-01-31 20:53:13,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 20:53:13,410 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2022-01-31 20:53:13,410 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.125) internal successors, (9), 6 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 20:53:13,410 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2022-01-31 20:53:13,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-01-31 20:53:13,411 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 20:53:13,411 INFO L514 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 20:53:13,411 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-01-31 20:53:13,411 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 20:53:13,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 20:53:13,412 INFO L85 PathProgramCache]: Analyzing trace with hash -1905189066, now seen corresponding path program 3 times [2022-01-31 20:53:13,412 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 20:53:13,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1952892421] [2022-01-31 20:53:13,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 20:53:13,414 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-01-31 20:53:13,414 WARN L89 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-01-31 20:53:13,415 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 20:53:13,416 INFO L248 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-01-31 20:53:13,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 20:53:13,526 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 20:53:13,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 20:53:13,532 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 20:53:13,533 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 20:53:13,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1952892421] [2022-01-31 20:53:13,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1952892421] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 20:53:13,533 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 20:53:13,533 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-01-31 20:53:13,533 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1378695786] [2022-01-31 20:53:13,534 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 20:53:13,534 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-01-31 20:53:13,534 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 20:53:13,535 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-01-31 20:53:13,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2022-01-31 20:53:13,535 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 9 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 7 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 20:53:13,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 20:53:13,628 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2022-01-31 20:53:13,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-01-31 20:53:13,629 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 7 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2022-01-31 20:53:13,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 20:53:13,631 INFO L225 Difference]: With dead ends: 21 [2022-01-31 20:53:13,631 INFO L226 Difference]: Without dead ends: 16 [2022-01-31 20:53:13,633 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2022-01-31 20:53:13,636 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 20:53:13,637 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 38 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 20:53:13,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-01-31 20:53:13,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-01-31 20:53:13,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 11 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 20:53:13,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2022-01-31 20:53:13,640 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2022-01-31 20:53:13,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 20:53:13,641 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2022-01-31 20:53:13,641 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 7 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 20:53:13,641 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2022-01-31 20:53:13,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-01-31 20:53:13,641 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 20:53:13,641 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 20:53:13,642 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-01-31 20:53:13,642 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 20:53:13,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 20:53:13,642 INFO L85 PathProgramCache]: Analyzing trace with hash 1105142364, now seen corresponding path program 4 times [2022-01-31 20:53:13,642 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 20:53:13,642 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [763398395] [2022-01-31 20:53:13,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 20:53:13,644 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-01-31 20:53:13,644 WARN L89 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-01-31 20:53:13,645 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 20:53:13,646 INFO L248 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-01-31 20:53:13,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 20:53:13,791 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 20:53:13,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 20:53:13,806 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 20:53:13,806 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 20:53:13,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [763398395] [2022-01-31 20:53:13,807 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [763398395] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 20:53:13,807 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 20:53:13,807 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-01-31 20:53:13,807 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379578558] [2022-01-31 20:53:13,807 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 20:53:13,807 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-01-31 20:53:13,808 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 20:53:13,808 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-01-31 20:53:13,809 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-01-31 20:53:13,809 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand has 10 states, 10 states have (on average 1.1) internal successors, (11), 8 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) [2022-01-31 20:53:13,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 20:53:13,905 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2022-01-31 20:53:13,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-01-31 20:53:13,906 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.1) internal successors, (11), 8 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 [2022-01-31 20:53:13,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 20:53:13,907 INFO L225 Difference]: With dead ends: 22 [2022-01-31 20:53:13,907 INFO L226 Difference]: Without dead ends: 17 [2022-01-31 20:53:13,908 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2022-01-31 20:53:13,913 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 20:53:13,919 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 38 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 20:53:13,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-01-31 20:53:13,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-01-31 20:53:13,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 12 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 20:53:13,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2022-01-31 20:53:13,925 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2022-01-31 20:53:13,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 20:53:13,925 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2022-01-31 20:53:13,925 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.1) internal successors, (11), 8 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) [2022-01-31 20:53:13,925 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2022-01-31 20:53:13,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-01-31 20:53:13,926 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 20:53:13,926 INFO L514 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 20:53:13,926 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-01-31 20:53:13,926 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 20:53:13,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 20:53:13,926 INFO L85 PathProgramCache]: Analyzing trace with hash -63863818, now seen corresponding path program 5 times [2022-01-31 20:53:13,927 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 20:53:13,927 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1659418742] [2022-01-31 20:53:13,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 20:53:13,933 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-01-31 20:53:13,935 WARN L89 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-01-31 20:53:13,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 20:53:13,939 INFO L248 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-01-31 20:53:13,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 20:53:14,109 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 20:53:14,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 20:53:14,119 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 20:53:14,120 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 20:53:14,120 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1659418742] [2022-01-31 20:53:14,120 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1659418742] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 20:53:14,120 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 20:53:14,120 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-01-31 20:53:14,120 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061086011] [2022-01-31 20:53:14,121 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 20:53:14,122 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-01-31 20:53:14,122 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 20:53:14,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-01-31 20:53:14,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2022-01-31 20:53:14,125 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand has 11 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 9 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 20:53:14,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 20:53:14,260 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2022-01-31 20:53:14,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-01-31 20:53:14,261 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 9 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2022-01-31 20:53:14,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 20:53:14,262 INFO L225 Difference]: With dead ends: 23 [2022-01-31 20:53:14,263 INFO L226 Difference]: Without dead ends: 18 [2022-01-31 20:53:14,264 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2022-01-31 20:53:14,265 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 20:53:14,266 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 43 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 20:53:14,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-01-31 20:53:14,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-01-31 20:53:14,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.0769230769230769) internal successors, (14), 13 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 20:53:14,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2022-01-31 20:53:14,277 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2022-01-31 20:53:14,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 20:53:14,278 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2022-01-31 20:53:14,278 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 9 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 20:53:14,278 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2022-01-31 20:53:14,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-01-31 20:53:14,279 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 20:53:14,279 INFO L514 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 20:53:14,279 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-01-31 20:53:14,280 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 20:53:14,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 20:53:14,280 INFO L85 PathProgramCache]: Analyzing trace with hash -1943317092, now seen corresponding path program 6 times [2022-01-31 20:53:14,280 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 20:53:14,280 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1870599159] [2022-01-31 20:53:14,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 20:53:14,283 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-01-31 20:53:14,284 WARN L89 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-01-31 20:53:14,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 20:53:14,285 INFO L248 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-01-31 20:53:14,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-01-31 20:53:14,310 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-01-31 20:53:14,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-01-31 20:53:14,349 INFO L133 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2022-01-31 20:53:14,350 INFO L628 BasicCegarLoop]: Counterexample is feasible [2022-01-31 20:53:14,355 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-01-31 20:53:14,358 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-01-31 20:53:14,360 INFO L732 BasicCegarLoop]: Path program histogram: [6, 1, 1] [2022-01-31 20:53:14,367 INFO L180 ceAbstractionStarter]: Computing trace abstraction results [2022-01-31 20:53:14,376 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 31.01 08:53:14 BoogieIcfgContainer [2022-01-31 20:53:14,376 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-01-31 20:53:14,376 INFO L158 Benchmark]: Toolchain (without parser) took 2267.35ms. Allocated memory was 187.7MB in the beginning and 242.2MB in the end (delta: 54.5MB). Free memory was 132.1MB in the beginning and 98.2MB in the end (delta: 33.9MB). Peak memory consumption was 89.7MB. Max. memory is 8.0GB. [2022-01-31 20:53:14,377 INFO L158 Benchmark]: CDTParser took 0.13ms. Allocated memory is still 187.7MB. Free memory is still 148.6MB. There was no memory consumed. Max. memory is 8.0GB. [2022-01-31 20:53:14,377 INFO L158 Benchmark]: CACSL2BoogieTranslator took 184.85ms. Allocated memory was 187.7MB in the beginning and 242.2MB in the end (delta: 54.5MB). Free memory was 131.9MB in the beginning and 215.7MB in the end (delta: -83.8MB). Peak memory consumption was 16.9MB. Max. memory is 8.0GB. [2022-01-31 20:53:14,377 INFO L158 Benchmark]: Boogie Preprocessor took 55.29ms. Allocated memory is still 242.2MB. Free memory was 215.7MB in the beginning and 216.2MB in the end (delta: -515.8kB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. [2022-01-31 20:53:14,378 INFO L158 Benchmark]: RCFGBuilder took 200.27ms. Allocated memory is still 242.2MB. Free memory was 216.2MB in the beginning and 205.2MB in the end (delta: 11.0MB). Peak memory consumption was 11.5MB. Max. memory is 8.0GB. [2022-01-31 20:53:14,378 INFO L158 Benchmark]: TraceAbstraction took 1822.52ms. Allocated memory is still 242.2MB. Free memory was 204.6MB in the beginning and 98.2MB in the end (delta: 106.4MB). Peak memory consumption was 107.0MB. Max. memory is 8.0GB. [2022-01-31 20:53:14,379 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.13ms. Allocated memory is still 187.7MB. Free memory is still 148.6MB. There was no memory consumed. Max. memory is 8.0GB. * CACSL2BoogieTranslator took 184.85ms. Allocated memory was 187.7MB in the beginning and 242.2MB in the end (delta: 54.5MB). Free memory was 131.9MB in the beginning and 215.7MB in the end (delta: -83.8MB). Peak memory consumption was 16.9MB. Max. memory is 8.0GB. * Boogie Preprocessor took 55.29ms. Allocated memory is still 242.2MB. Free memory was 215.7MB in the beginning and 216.2MB in the end (delta: -515.8kB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. * RCFGBuilder took 200.27ms. Allocated memory is still 242.2MB. Free memory was 216.2MB in the beginning and 205.2MB in the end (delta: 11.0MB). Peak memory consumption was 11.5MB. Max. memory is 8.0GB. * TraceAbstraction took 1822.52ms. Allocated memory is still 242.2MB. Free memory was 204.6MB in the beginning and 98.2MB in the end (delta: 106.4MB). Peak memory consumption was 107.0MB. Max. memory is 8.0GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 7]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L13] unsigned int x = 0; [L14] unsigned int y = 1; [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND FALSE !(x < 6) [L21] CALL __VERIFIER_assert(x != 6) [L6] COND TRUE !(cond) [L7] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 21 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 1.8s, OverallIterations: 8, TraceHistogramMax: 6, PathProgramHistogramMax: 6, EmptinessCheckTime: 0.0s, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 46 SdHoareTripleChecker+Valid, 0.2s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 45 mSDsluCounter, 233 SdHoareTripleChecker+Invalid, 0.2s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 150 mSDsCounter, 50 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 265 IncrementalHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 50 mSolverCounterUnsat, 83 mSDtfsCounter, 265 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 88 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=18occurred in iteration=0, InterpolantAutomatonStates: 42, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 7 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2022-01-31 20:53:14,414 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...