/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/sum04-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-05ce600 [2022-02-24 02:45:49,921 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-02-24 02:45:49,922 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-02-24 02:45:49,954 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-02-24 02:45:50,001 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-02-24 02:45:50,002 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-02-24 02:45:50,002 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-02-24 02:45:50,003 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-02-24 02:45:50,015 INFO L113 SettingsManager]: Loading preferences was successful [2022-02-24 02:45:50,015 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-02-24 02:45:50,017 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-02-24 02:45:50,017 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-02-24 02:45:50,017 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-02-24 02:45:50,017 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-02-24 02:45:50,017 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-02-24 02:45:50,017 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-02-24 02:45:50,017 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-02-24 02:45:50,017 INFO L138 SettingsManager]: * Use constant arrays=true [2022-02-24 02:45:50,018 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-02-24 02:45:50,018 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-02-24 02:45:50,018 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-02-24 02:45:50,018 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-02-24 02:45:50,018 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-02-24 02:45:50,018 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-02-24 02:45:50,018 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-02-24 02:45:50,019 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2022-02-24 02:45:50,019 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-02-24 02:45:50,019 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-02-24 02:45:50,019 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-02-24 02:45:50,195 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-02-24 02:45:50,229 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-02-24 02:45:50,230 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-02-24 02:45:50,231 INFO L271 PluginConnector]: Initializing CDTParser... [2022-02-24 02:45:50,241 INFO L275 PluginConnector]: CDTParser initialized [2022-02-24 02:45:50,242 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum04-1.i [2022-02-24 02:45:50,295 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9392156e5/6e76bbf2c70e45799662b0e1bdace72d/FLAG43a090508 [2022-02-24 02:45:50,638 INFO L306 CDTParser]: Found 1 translation units. [2022-02-24 02:45:50,639 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum04-1.i [2022-02-24 02:45:50,644 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9392156e5/6e76bbf2c70e45799662b0e1bdace72d/FLAG43a090508 [2022-02-24 02:45:50,654 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9392156e5/6e76bbf2c70e45799662b0e1bdace72d [2022-02-24 02:45:50,657 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-02-24 02:45:50,658 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-02-24 02:45:50,659 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-02-24 02:45:50,659 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-02-24 02:45:50,662 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-02-24 02:45:50,663 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.02 02:45:50" (1/1) ... [2022-02-24 02:45:50,664 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@647f6e53 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 02:45:50, skipping insertion in model container [2022-02-24 02:45:50,664 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.02 02:45:50" (1/1) ... [2022-02-24 02:45:50,668 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-02-24 02:45:50,676 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-02-24 02:45:50,781 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/sum04-1.i[808,821] [2022-02-24 02:45:50,788 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-02-24 02:45:50,792 INFO L203 MainTranslator]: Completed pre-run [2022-02-24 02:45:50,808 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/sum04-1.i[808,821] [2022-02-24 02:45:50,811 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-02-24 02:45:50,819 INFO L208 MainTranslator]: Completed translation [2022-02-24 02:45:50,819 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 02:45:50 WrapperNode [2022-02-24 02:45:50,819 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-02-24 02:45:50,820 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-02-24 02:45:50,820 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-02-24 02:45:50,820 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-02-24 02:45:50,828 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 02:45:50" (1/1) ... [2022-02-24 02:45:50,828 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 02:45:50" (1/1) ... [2022-02-24 02:45:50,834 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 02:45:50" (1/1) ... [2022-02-24 02:45:50,835 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 02:45:50" (1/1) ... [2022-02-24 02:45:50,837 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 02:45:50" (1/1) ... [2022-02-24 02:45:50,839 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 02:45:50" (1/1) ... [2022-02-24 02:45:50,839 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 02:45:50" (1/1) ... [2022-02-24 02:45:50,840 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-02-24 02:45:50,841 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-02-24 02:45:50,841 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-02-24 02:45:50,841 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-02-24 02:45:50,842 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 02:45:50" (1/1) ... [2022-02-24 02:45:50,848 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-02-24 02:45:50,857 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-24 02:45:50,875 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) [2022-02-24 02:45:50,909 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 [2022-02-24 02:45:50,936 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-02-24 02:45:50,936 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-02-24 02:45:50,936 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-02-24 02:45:50,937 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-02-24 02:45:50,937 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-02-24 02:45:50,937 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-02-24 02:45:50,937 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-02-24 02:45:50,937 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2022-02-24 02:45:50,937 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2022-02-24 02:45:50,938 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-02-24 02:45:50,938 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-02-24 02:45:50,938 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-02-24 02:45:50,938 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-02-24 02:45:50,938 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-02-24 02:45:50,938 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-02-24 02:45:50,939 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-02-24 02:45:50,939 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-02-24 02:45:50,939 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-02-24 02:45:50,941 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-02-24 02:45:50,982 INFO L234 CfgBuilder]: Building ICFG [2022-02-24 02:45:50,983 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-02-24 02:45:51,048 INFO L275 CfgBuilder]: Performing block encoding [2022-02-24 02:45:51,052 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-02-24 02:45:51,052 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-02-24 02:45:51,053 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.02 02:45:51 BoogieIcfgContainer [2022-02-24 02:45:51,053 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-02-24 02:45:51,054 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-02-24 02:45:51,054 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-02-24 02:45:51,056 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-02-24 02:45:51,056 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.02 02:45:50" (1/3) ... [2022-02-24 02:45:51,057 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1848328e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.02 02:45:51, skipping insertion in model container [2022-02-24 02:45:51,057 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 02:45:50" (2/3) ... [2022-02-24 02:45:51,057 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1848328e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.02 02:45:51, skipping insertion in model container [2022-02-24 02:45:51,057 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.02 02:45:51" (3/3) ... [2022-02-24 02:45:51,058 INFO L111 eAbstractionObserver]: Analyzing ICFG sum04-1.i [2022-02-24 02:45:51,061 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-02-24 02:45:51,061 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-02-24 02:45:51,128 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-02-24 02:45:51,146 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 [2022-02-24 02:45:51,147 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-02-24 02:45:51,172 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-02-24 02:45:51,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-02-24 02:45:51,181 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:45:51,181 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:45:51,182 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:45:51,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:45:51,185 INFO L85 PathProgramCache]: Analyzing trace with hash 1466806487, now seen corresponding path program 1 times [2022-02-24 02:45:51,191 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:45:51,192 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1481446839] [2022-02-24 02:45:51,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:45:51,205 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:45:51,238 INFO L213 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-02-24 02:45:51,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:51,334 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:45:51,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:51,342 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:45:51,343 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:45:51,343 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1481446839] [2022-02-24 02:45:51,344 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1481446839] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:45:51,344 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:45:51,344 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-02-24 02:45:51,349 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49122955] [2022-02-24 02:45:51,349 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:45:51,352 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-02-24 02:45:51,352 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:45:51,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-02-24 02:45:51,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-02-24 02:45:51,372 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:51,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:45:51,399 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2022-02-24 02:45:51,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-02-24 02:45:51,401 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 [2022-02-24 02:45:51,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:45:51,411 INFO L225 Difference]: With dead ends: 31 [2022-02-24 02:45:51,411 INFO L226 Difference]: Without dead ends: 14 [2022-02-24 02:45:51,413 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 [2022-02-24 02:45:51,415 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 12 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-24 02:45:51,416 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 23 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-02-24 02:45:51,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-02-24 02:45:51,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-02-24 02:45:51,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:51,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2022-02-24 02:45:51,438 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2022-02-24 02:45:51,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:45:51,439 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2022-02-24 02:45:51,439 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) [2022-02-24 02:45:51,439 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2022-02-24 02:45:51,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-02-24 02:45:51,439 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:45:51,439 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:45:51,440 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-02-24 02:45:51,440 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:45:51,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:45:51,440 INFO L85 PathProgramCache]: Analyzing trace with hash 1456647756, now seen corresponding path program 1 times [2022-02-24 02:45:51,441 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:45:51,441 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [324103799] [2022-02-24 02:45:51,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:45:51,441 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:45:51,443 INFO L213 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-02-24 02:45:51,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:51,485 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:45:51,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:51,494 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:45:51,496 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:45:51,496 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [324103799] [2022-02-24 02:45:51,496 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [324103799] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:45:51,496 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:45:51,496 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-02-24 02:45:51,496 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1945694566] [2022-02-24 02:45:51,497 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:45:51,497 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-02-24 02:45:51,497 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:45:51,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-02-24 02:45:51,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-02-24 02:45:51,498 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:51,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:45:51,527 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2022-02-24 02:45:51,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-02-24 02:45:51,527 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 [2022-02-24 02:45:51,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:45:51,528 INFO L225 Difference]: With dead ends: 25 [2022-02-24 02:45:51,528 INFO L226 Difference]: Without dead ends: 17 [2022-02-24 02:45:51,528 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-02-24 02:45:51,529 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 13 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-24 02:45:51,530 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 19 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-02-24 02:45:51,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-02-24 02:45:51,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2022-02-24 02:45:51,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:51,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2022-02-24 02:45:51,535 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2022-02-24 02:45:51,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:45:51,535 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2022-02-24 02:45:51,535 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) [2022-02-24 02:45:51,535 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2022-02-24 02:45:51,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-02-24 02:45:51,536 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:45:51,536 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:45:51,536 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-02-24 02:45:51,536 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:45:51,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:45:51,537 INFO L85 PathProgramCache]: Analyzing trace with hash 193151625, now seen corresponding path program 1 times [2022-02-24 02:45:51,537 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:45:51,537 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [240249346] [2022-02-24 02:45:51,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:45:51,538 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:45:51,746 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 02:45:51,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:51,827 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:45:51,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:51,839 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:45:51,869 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:45:51,869 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [240249346] [2022-02-24 02:45:51,870 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [240249346] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:45:51,871 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:45:51,871 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-02-24 02:45:51,872 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905499926] [2022-02-24 02:45:51,872 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:45:51,872 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-02-24 02:45:51,872 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:45:51,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-02-24 02:45:51,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-02-24 02:45:51,874 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:51,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:45:51,940 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2022-02-24 02:45:51,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-02-24 02:45:51,941 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2022-02-24 02:45:51,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:45:51,942 INFO L225 Difference]: With dead ends: 28 [2022-02-24 02:45:51,942 INFO L226 Difference]: Without dead ends: 20 [2022-02-24 02:45:51,943 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 7 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2022-02-24 02:45:51,952 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 15 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-24 02:45:51,955 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 24 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-02-24 02:45:51,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-02-24 02:45:51,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2022-02-24 02:45:51,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:51,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2022-02-24 02:45:51,961 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2022-02-24 02:45:51,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:45:51,962 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2022-02-24 02:45:51,962 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:51,962 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2022-02-24 02:45:51,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-02-24 02:45:51,963 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:45:51,963 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:45:51,963 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-02-24 02:45:51,963 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:45:52,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:45:52,011 INFO L85 PathProgramCache]: Analyzing trace with hash 473295148, now seen corresponding path program 2 times [2022-02-24 02:45:52,011 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:45:52,011 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [457825382] [2022-02-24 02:45:52,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:45:52,012 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:45:52,185 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 02:45:52,309 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 02:45:52,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:52,384 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:45:52,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:52,405 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:45:52,435 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:45:52,436 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [457825382] [2022-02-24 02:45:52,436 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [457825382] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:45:52,436 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:45:52,436 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-02-24 02:45:52,436 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387955725] [2022-02-24 02:45:52,436 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:45:52,437 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-24 02:45:52,437 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:45:52,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-24 02:45:52,437 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2022-02-24 02:45:52,438 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:52,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:45:52,510 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2022-02-24 02:45:52,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-24 02:45:52,511 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-02-24 02:45:52,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:45:52,513 INFO L225 Difference]: With dead ends: 31 [2022-02-24 02:45:52,513 INFO L226 Difference]: Without dead ends: 23 [2022-02-24 02:45:52,514 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 9 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2022-02-24 02:45:52,525 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 17 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-24 02:45:52,525 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 29 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-02-24 02:45:52,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-02-24 02:45:52,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2022-02-24 02:45:52,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:52,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2022-02-24 02:45:52,531 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 17 [2022-02-24 02:45:52,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:45:52,531 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2022-02-24 02:45:52,532 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:52,532 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2022-02-24 02:45:52,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-02-24 02:45:52,532 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:45:52,533 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:45:52,533 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-02-24 02:45:52,533 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:45:52,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:45:52,533 INFO L85 PathProgramCache]: Analyzing trace with hash 1107532713, now seen corresponding path program 3 times [2022-02-24 02:45:52,534 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:45:52,534 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1557185134] [2022-02-24 02:45:52,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:45:52,535 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:45:52,706 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 02:45:52,810 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 02:45:52,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:52,836 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:45:52,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:52,841 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:45:52,878 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:45:52,879 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1557185134] [2022-02-24 02:45:52,879 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1557185134] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:45:52,879 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:45:52,879 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-02-24 02:45:52,879 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94225710] [2022-02-24 02:45:52,880 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:45:52,880 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-02-24 02:45:52,880 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:45:52,880 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-02-24 02:45:52,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-02-24 02:45:52,881 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:52,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:45:52,963 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2022-02-24 02:45:52,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-02-24 02:45:52,963 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2022-02-24 02:45:52,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:45:52,964 INFO L225 Difference]: With dead ends: 34 [2022-02-24 02:45:52,964 INFO L226 Difference]: Without dead ends: 26 [2022-02-24 02:45:52,965 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 9 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2022-02-24 02:45:52,966 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 19 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-24 02:45:52,966 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 33 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-02-24 02:45:52,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-02-24 02:45:52,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2022-02-24 02:45:52,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.1) internal successors, (22), 20 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:52,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2022-02-24 02:45:52,972 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 20 [2022-02-24 02:45:52,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:45:52,972 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2022-02-24 02:45:52,973 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:52,973 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2022-02-24 02:45:52,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-02-24 02:45:52,973 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:45:52,974 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:45:52,974 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-02-24 02:45:52,974 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:45:52,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:45:52,975 INFO L85 PathProgramCache]: Analyzing trace with hash -402263410, now seen corresponding path program 1 times [2022-02-24 02:45:52,975 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:45:52,975 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [940534682] [2022-02-24 02:45:52,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:45:52,976 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms