/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/nested3-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-6c470ae [2022-02-15 04:03:15,830 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-02-15 04:03:15,832 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-02-15 04:03:15,886 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-02-15 04:03:15,928 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-02-15 04:03:15,928 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-02-15 04:03:15,928 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-02-15 04:03:15,930 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-02-15 04:03:15,938 INFO L113 SettingsManager]: Loading preferences was successful [2022-02-15 04:03:15,938 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-02-15 04:03:15,939 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-02-15 04:03:15,939 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-02-15 04:03:15,939 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-02-15 04:03:15,939 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-02-15 04:03:15,939 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-02-15 04:03:15,939 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-02-15 04:03:15,939 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-02-15 04:03:15,939 INFO L138 SettingsManager]: * Use constant arrays=true [2022-02-15 04:03:15,940 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-02-15 04:03:15,940 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-02-15 04:03:15,940 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-02-15 04:03:15,940 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-02-15 04:03:15,940 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-02-15 04:03:15,940 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-02-15 04:03:15,941 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-02-15 04:03:15,941 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2022-02-15 04:03:15,941 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-02-15 04:03:15,941 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-02-15 04:03:15,941 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-02-15 04:03:16,133 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-02-15 04:03:16,147 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-02-15 04:03:16,148 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-02-15 04:03:16,149 INFO L271 PluginConnector]: Initializing CDTParser... [2022-02-15 04:03:16,153 INFO L275 PluginConnector]: CDTParser initialized [2022-02-15 04:03:16,154 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/nested3-1.c [2022-02-15 04:03:16,197 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a042d76dd/b74e2f47b0dc4b5496f4348c697f8d78/FLAGe1a297af4 [2022-02-15 04:03:16,553 INFO L306 CDTParser]: Found 1 translation units. [2022-02-15 04:03:16,554 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested3-1.c [2022-02-15 04:03:16,563 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a042d76dd/b74e2f47b0dc4b5496f4348c697f8d78/FLAGe1a297af4 [2022-02-15 04:03:16,999 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a042d76dd/b74e2f47b0dc4b5496f4348c697f8d78 [2022-02-15 04:03:17,001 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-02-15 04:03:17,002 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-02-15 04:03:17,003 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-02-15 04:03:17,003 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-02-15 04:03:17,005 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-02-15 04:03:17,006 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.02 04:03:17" (1/1) ... [2022-02-15 04:03:17,007 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@f94e975 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 04:03:17, skipping insertion in model container [2022-02-15 04:03:17,007 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.02 04:03:17" (1/1) ... [2022-02-15 04:03:17,011 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-02-15 04:03:17,020 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-02-15 04:03:17,119 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested3-1.c[321,334] [2022-02-15 04:03:17,151 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-02-15 04:03:17,156 INFO L203 MainTranslator]: Completed pre-run [2022-02-15 04:03:17,167 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested3-1.c[321,334] [2022-02-15 04:03:17,170 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-02-15 04:03:17,178 INFO L208 MainTranslator]: Completed translation [2022-02-15 04:03:17,179 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 04:03:17 WrapperNode [2022-02-15 04:03:17,179 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-02-15 04:03:17,180 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-02-15 04:03:17,180 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-02-15 04:03:17,180 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-02-15 04:03:17,197 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 04:03:17" (1/1) ... [2022-02-15 04:03:17,197 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 04:03:17" (1/1) ... [2022-02-15 04:03:17,202 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 04:03:17" (1/1) ... [2022-02-15 04:03:17,202 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 04:03:17" (1/1) ... [2022-02-15 04:03:17,212 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 04:03:17" (1/1) ... [2022-02-15 04:03:17,215 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 04:03:17" (1/1) ... [2022-02-15 04:03:17,216 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 04:03:17" (1/1) ... [2022-02-15 04:03:17,217 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-02-15 04:03:17,217 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-02-15 04:03:17,217 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-02-15 04:03:17,217 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-02-15 04:03:17,219 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 04:03:17" (1/1) ... [2022-02-15 04:03:17,223 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-02-15 04:03:17,233 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-15 04:03:17,243 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-02-15 04:03:17,247 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-02-15 04:03:17,272 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-02-15 04:03:17,272 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-02-15 04:03:17,272 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-02-15 04:03:17,272 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-02-15 04:03:17,272 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-02-15 04:03:17,272 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-02-15 04:03:17,287 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-02-15 04:03:17,287 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-02-15 04:03:17,287 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-02-15 04:03:17,287 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-02-15 04:03:17,287 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-02-15 04:03:17,287 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-02-15 04:03:17,288 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-02-15 04:03:17,288 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-02-15 04:03:17,288 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-02-15 04:03:17,288 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-02-15 04:03:17,288 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-02-15 04:03:17,330 INFO L234 CfgBuilder]: Building ICFG [2022-02-15 04:03:17,331 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-02-15 04:03:17,435 INFO L275 CfgBuilder]: Performing block encoding [2022-02-15 04:03:17,439 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-02-15 04:03:17,439 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2022-02-15 04:03:17,442 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.02 04:03:17 BoogieIcfgContainer [2022-02-15 04:03:17,442 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-02-15 04:03:17,443 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-02-15 04:03:17,443 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-02-15 04:03:17,446 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-02-15 04:03:17,446 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.02 04:03:17" (1/3) ... [2022-02-15 04:03:17,454 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@620c3d2b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.02 04:03:17, skipping insertion in model container [2022-02-15 04:03:17,454 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 04:03:17" (2/3) ... [2022-02-15 04:03:17,455 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@620c3d2b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.02 04:03:17, skipping insertion in model container [2022-02-15 04:03:17,455 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.02 04:03:17" (3/3) ... [2022-02-15 04:03:17,471 INFO L111 eAbstractionObserver]: Analyzing ICFG nested3-1.c [2022-02-15 04:03:17,475 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-02-15 04:03:17,475 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-02-15 04:03:17,508 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-02-15 04:03:17,513 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=AcceleratedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=QVASR [2022-02-15 04:03:17,513 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-02-15 04:03:17,522 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 16 states have internal predecessors, (23), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-15 04:03:17,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-02-15 04:03:17,527 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 04:03:17,528 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 04:03:17,528 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 04:03:17,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 04:03:17,532 INFO L85 PathProgramCache]: Analyzing trace with hash -1794590667, now seen corresponding path program 1 times [2022-02-15 04:03:17,537 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 04:03:17,537 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1822600176] [2022-02-15 04:03:17,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 04:03:17,546 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 04:03:17,586 INFO L274 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-02-15 04:03:17,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:03:17,678 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 04:03:17,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:03:17,691 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 04:03:17,692 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 04:03:17,692 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1822600176] [2022-02-15 04:03:17,693 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1822600176] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 04:03:17,694 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 04:03:17,694 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-02-15 04:03:17,694 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [479311580] [2022-02-15 04:03:17,695 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 04:03:17,699 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-02-15 04:03:17,699 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 04:03:17,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-02-15 04:03:17,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-02-15 04:03:17,718 INFO L87 Difference]: Start difference. First operand has 25 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 16 states have internal predecessors, (23), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 04:03:17,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 04:03:17,773 INFO L93 Difference]: Finished difference Result 44 states and 63 transitions. [2022-02-15 04:03:17,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-02-15 04:03:17,775 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-02-15 04:03:17,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 04:03:17,779 INFO L225 Difference]: With dead ends: 44 [2022-02-15 04:03:17,779 INFO L226 Difference]: Without dead ends: 20 [2022-02-15 04:03:17,781 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-02-15 04:03:17,783 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 16 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-15 04:03:17,785 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 29 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-02-15 04:03:17,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-02-15 04:03:17,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-02-15 04:03:17,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-02-15 04:03:17,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2022-02-15 04:03:17,810 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 11 [2022-02-15 04:03:17,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 04:03:17,811 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2022-02-15 04:03:17,811 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 04:03:17,811 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2022-02-15 04:03:17,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-02-15 04:03:17,811 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 04:03:17,811 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 04:03:17,812 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-02-15 04:03:17,812 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 04:03:17,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 04:03:17,812 INFO L85 PathProgramCache]: Analyzing trace with hash -1824143339, now seen corresponding path program 1 times [2022-02-15 04:03:17,812 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 04:03:17,813 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1689305539] [2022-02-15 04:03:17,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 04:03:17,813 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 04:03:17,815 INFO L274 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-02-15 04:03:17,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:03:17,871 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 04:03:17,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:03:17,884 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 04:03:17,884 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 04:03:17,884 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1689305539] [2022-02-15 04:03:17,884 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1689305539] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 04:03:17,885 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 04:03:17,885 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-02-15 04:03:17,885 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753766761] [2022-02-15 04:03:17,885 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 04:03:17,885 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-02-15 04:03:17,886 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 04:03:17,886 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-02-15 04:03:17,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-02-15 04:03:17,886 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 04:03:17,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 04:03:17,969 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2022-02-15 04:03:17,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-02-15 04:03:17,970 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-02-15 04:03:17,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 04:03:17,971 INFO L225 Difference]: With dead ends: 34 [2022-02-15 04:03:17,971 INFO L226 Difference]: Without dead ends: 27 [2022-02-15 04:03:17,972 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-02-15 04:03:17,972 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 26 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-15 04:03:17,973 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 27 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-15 04:03:17,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-02-15 04:03:17,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 21. [2022-02-15 04:03:17,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 14 states have internal predecessors, (17), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-02-15 04:03:17,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2022-02-15 04:03:17,979 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 11 [2022-02-15 04:03:17,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 04:03:17,979 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2022-02-15 04:03:17,979 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 04:03:17,980 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2022-02-15 04:03:17,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-02-15 04:03:17,980 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 04:03:17,980 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 04:03:17,980 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-02-15 04:03:17,980 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 04:03:17,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 04:03:17,981 INFO L85 PathProgramCache]: Analyzing trace with hash -699512288, now seen corresponding path program 1 times [2022-02-15 04:03:17,981 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 04:03:17,981 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1699311037] [2022-02-15 04:03:17,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 04:03:17,982 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 04:03:17,988 INFO L274 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-02-15 04:03:18,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:03:18,078 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 04:03:18,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:03:18,087 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 04:03:18,087 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 04:03:18,087 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1699311037] [2022-02-15 04:03:18,088 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1699311037] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 04:03:18,088 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 04:03:18,088 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-02-15 04:03:18,088 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758942130] [2022-02-15 04:03:18,088 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 04:03:18,088 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-02-15 04:03:18,088 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 04:03:18,089 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-02-15 04:03:18,089 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-02-15 04:03:18,089 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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) [2022-02-15 04:03:18,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 04:03:18,143 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2022-02-15 04:03:18,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-02-15 04:03:18,144 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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 [2022-02-15 04:03:18,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 04:03:18,146 INFO L225 Difference]: With dead ends: 39 [2022-02-15 04:03:18,146 INFO L226 Difference]: Without dead ends: 25 [2022-02-15 04:03:18,147 INFO L932 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 [2022-02-15 04:03:18,153 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 21 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-15 04:03:18,154 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 27 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-02-15 04:03:18,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-02-15 04:03:18,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2022-02-15 04:03:18,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 15 states have internal predecessors, (18), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-02-15 04:03:18,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2022-02-15 04:03:18,164 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 12 [2022-02-15 04:03:18,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 04:03:18,164 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2022-02-15 04:03:18,165 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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) [2022-02-15 04:03:18,165 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2022-02-15 04:03:18,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-02-15 04:03:18,165 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 04:03:18,165 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 04:03:18,165 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-02-15 04:03:18,165 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 04:03:18,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 04:03:18,166 INFO L85 PathProgramCache]: Analyzing trace with hash -185588926, now seen corresponding path program 1 times [2022-02-15 04:03:18,166 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 04:03:18,166 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1607666388] [2022-02-15 04:03:18,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 04:03:18,167 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 04:03:18,168 INFO L274 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-02-15 04:03:18,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:03:18,238 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 04:03:18,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:03:18,248 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 04:03:18,248 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 04:03:18,248 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1607666388] [2022-02-15 04:03:18,248 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1607666388] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 04:03:18,249 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 04:03:18,249 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-02-15 04:03:18,249 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92798294] [2022-02-15 04:03:18,249 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 04:03:18,249 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-02-15 04:03:18,249 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 04:03:18,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-02-15 04:03:18,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-02-15 04:03:18,250 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 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) [2022-02-15 04:03:18,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 04:03:18,285 INFO L93 Difference]: Finished difference Result 39 states and 48 transitions. [2022-02-15 04:03:18,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-02-15 04:03:18,285 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 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 [2022-02-15 04:03:18,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 04:03:18,286 INFO L225 Difference]: With dead ends: 39 [2022-02-15 04:03:18,286 INFO L226 Difference]: Without dead ends: 24 [2022-02-15 04:03:18,286 INFO L932 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 [2022-02-15 04:03:18,287 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 17 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-15 04:03:18,297 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 28 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-02-15 04:03:18,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-02-15 04:03:18,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2022-02-15 04:03:18,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 16 states have internal predecessors, (19), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-02-15 04:03:18,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2022-02-15 04:03:18,302 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 13 [2022-02-15 04:03:18,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 04:03:18,302 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2022-02-15 04:03:18,302 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 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) [2022-02-15 04:03:18,303 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2022-02-15 04:03:18,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-02-15 04:03:18,303 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 04:03:18,303 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 04:03:18,303 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-02-15 04:03:18,303 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 04:03:18,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 04:03:18,304 INFO L85 PathProgramCache]: Analyzing trace with hash -1431986846, now seen corresponding path program 1 times [2022-02-15 04:03:18,304 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 04:03:18,304 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [266543785] [2022-02-15 04:03:18,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 04:03:18,372 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-15 04:03:18,373 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 04:03:18,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:03:18,397 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-02-15 04:03:18,398 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.AssertionError: No Interpolants at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.InterpolatingTraceCheckCraig.getInterpolants(InterpolatingTraceCheckCraig.java:273) at de.uni_freiburg.informatik.ultimate.lib.acceleratedinterpolation.Interpolator.generateInterpolantsCraigNested(Interpolator.java:179) at de.uni_freiburg.informatik.ultimate.lib.acceleratedinterpolation.Interpolator.generateInterpolants(Interpolator.java:126) at de.uni_freiburg.informatik.ultimate.lib.acceleratedinterpolation.AcceleratedInterpolationCore.acceleratedInterpolationCoreIsCorrect(AcceleratedInterpolationCore.java:290) at de.uni_freiburg.informatik.ultimate.lib.acceleratedinterpolation.AcceleratedInterpolation.(AcceleratedInterpolation.java:185) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModulePreferences.construct(IpTcStrategyModulePreferences.java:145) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.isCorrect(IpTcStrategyModuleBase.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.checkFeasibility(AutomatonFreeRefinementEngine.java:216) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:129) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:93) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:79) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:414) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:304) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:264) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:177) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:156) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-02-15 04:03:18,400 INFO L158 Benchmark]: Toolchain (without parser) took 1398.25ms. Allocated memory was 207.6MB in the beginning and 268.4MB in the end (delta: 60.8MB). Free memory was 156.3MB in the beginning and 236.6MB in the end (delta: -80.3MB). There was no memory consumed. Max. memory is 8.0GB. [2022-02-15 04:03:18,400 INFO L158 Benchmark]: CDTParser took 0.10ms. Allocated memory is still 207.6MB. Free memory is still 172.6MB. There was no memory consumed. Max. memory is 8.0GB. [2022-02-15 04:03:18,401 INFO L158 Benchmark]: CACSL2BoogieTranslator took 176.27ms. Allocated memory is still 207.6MB. Free memory was 156.1MB in the beginning and 182.0MB in the end (delta: -25.9MB). Peak memory consumption was 10.6MB. Max. memory is 8.0GB. [2022-02-15 04:03:18,401 INFO L158 Benchmark]: Boogie Preprocessor took 37.03ms. Allocated memory is still 207.6MB. Free memory was 182.0MB in the beginning and 180.6MB in the end (delta: 1.4MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. [2022-02-15 04:03:18,401 INFO L158 Benchmark]: RCFGBuilder took 224.64ms. Allocated memory is still 207.6MB. Free memory was 180.6MB in the beginning and 169.8MB in the end (delta: 10.8MB). Peak memory consumption was 10.5MB. Max. memory is 8.0GB. [2022-02-15 04:03:18,402 INFO L158 Benchmark]: TraceAbstraction took 956.39ms. Allocated memory was 207.6MB in the beginning and 268.4MB in the end (delta: 60.8MB). Free memory was 169.4MB in the beginning and 236.6MB in the end (delta: -67.1MB). There was no memory consumed. Max. memory is 8.0GB. [2022-02-15 04:03:18,403 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10ms. Allocated memory is still 207.6MB. Free memory is still 172.6MB. There was no memory consumed. Max. memory is 8.0GB. * CACSL2BoogieTranslator took 176.27ms. Allocated memory is still 207.6MB. Free memory was 156.1MB in the beginning and 182.0MB in the end (delta: -25.9MB). Peak memory consumption was 10.6MB. Max. memory is 8.0GB. * Boogie Preprocessor took 37.03ms. Allocated memory is still 207.6MB. Free memory was 182.0MB in the beginning and 180.6MB in the end (delta: 1.4MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. * RCFGBuilder took 224.64ms. Allocated memory is still 207.6MB. Free memory was 180.6MB in the beginning and 169.8MB in the end (delta: 10.8MB). Peak memory consumption was 10.5MB. Max. memory is 8.0GB. * TraceAbstraction took 956.39ms. Allocated memory was 207.6MB in the beginning and 268.4MB in the end (delta: 60.8MB). Free memory was 169.4MB in the beginning and 236.6MB in the end (delta: -67.1MB). There was no memory consumed. Max. memory is 8.0GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: AssertionError: No Interpolants de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: AssertionError: No Interpolants: de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.InterpolatingTraceCheckCraig.getInterpolants(InterpolatingTraceCheckCraig.java:273) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2022-02-15 04:03:18,425 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with exit code 0 Received shutdown request...