/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/loop-simple/nested_4.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 19:11:01,292 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 19:11:01,294 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 19:11:01,328 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 19:11:01,365 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 19:11:01,366 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 19:11:01,366 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 19:11:01,367 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-20 19:11:01,372 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 19:11:01,372 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 19:11:01,373 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 19:11:01,373 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 19:11:01,373 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 19:11:01,373 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 19:11:01,373 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 19:11:01,373 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 19:11:01,373 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 19:11:01,374 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 19:11:01,374 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 19:11:01,374 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 19:11:01,374 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 19:11:01,374 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 19:11:01,374 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 19:11:01,374 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 19:11:01,374 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 19:11:01,374 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 19:11:01,374 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 19:11:01,374 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 19:11:01,375 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 19:11:01,375 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-20 19:11:01,375 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 19:11:01,534 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 19:11:01,549 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 19:11:01,551 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 19:11:01,551 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 19:11:01,555 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 19:11:01,556 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-simple/nested_4.c [2022-03-20 19:11:01,610 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/26e2e8768/c4068541891541ef9744bcd75321e66a/FLAGa41b44a0d [2022-03-20 19:11:01,968 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 19:11:01,969 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_4.c [2022-03-20 19:11:01,973 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/26e2e8768/c4068541891541ef9744bcd75321e66a/FLAGa41b44a0d [2022-03-20 19:11:01,983 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/26e2e8768/c4068541891541ef9744bcd75321e66a [2022-03-20 19:11:01,985 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 19:11:01,986 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 19:11:01,987 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 19:11:01,987 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 19:11:01,989 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 19:11:01,989 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 07:11:01" (1/1) ... [2022-03-20 19:11:01,990 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@207c1e33 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:11:01, skipping insertion in model container [2022-03-20 19:11:01,990 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 07:11:01" (1/1) ... [2022-03-20 19:11:01,995 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 19:11:02,002 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 19:11:02,128 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_4.c[841,854] [2022-03-20 19:11:02,136 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 19:11:02,143 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 19:11:02,155 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_4.c[841,854] [2022-03-20 19:11:02,156 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 19:11:02,165 INFO L208 MainTranslator]: Completed translation [2022-03-20 19:11:02,166 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:11:02 WrapperNode [2022-03-20 19:11:02,166 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 19:11:02,168 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 19:11:02,168 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 19:11:02,168 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 19:11:02,176 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:11:02" (1/1) ... [2022-03-20 19:11:02,177 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:11:02" (1/1) ... [2022-03-20 19:11:02,181 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:11:02" (1/1) ... [2022-03-20 19:11:02,181 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:11:02" (1/1) ... [2022-03-20 19:11:02,193 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:11:02" (1/1) ... [2022-03-20 19:11:02,197 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:11:02" (1/1) ... [2022-03-20 19:11:02,204 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:11:02" (1/1) ... [2022-03-20 19:11:02,205 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 19:11:02,206 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 19:11:02,206 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 19:11:02,206 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 19:11:02,209 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:11:02" (1/1) ... [2022-03-20 19:11:02,214 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 19:11:02,221 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:11:02,240 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-20 19:11:02,259 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-20 19:11:02,281 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 19:11:02,281 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 19:11:02,281 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 19:11:02,281 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 19:11:02,282 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 19:11:02,282 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 19:11:02,282 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 19:11:02,282 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 19:11:02,282 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 19:11:02,282 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 19:11:02,282 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 19:11:02,283 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 19:11:02,283 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 19:11:02,283 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 19:11:02,330 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 19:11:02,331 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 19:11:02,418 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 19:11:02,422 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 19:11:02,422 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2022-03-20 19:11:02,423 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 07:11:02 BoogieIcfgContainer [2022-03-20 19:11:02,424 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 19:11:02,425 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 19:11:02,425 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 19:11:02,427 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 19:11:02,427 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 07:11:01" (1/3) ... [2022-03-20 19:11:02,428 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f742ea3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 07:11:02, skipping insertion in model container [2022-03-20 19:11:02,428 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:11:02" (2/3) ... [2022-03-20 19:11:02,428 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f742ea3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 07:11:02, skipping insertion in model container [2022-03-20 19:11:02,428 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 07:11:02" (3/3) ... [2022-03-20 19:11:02,429 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_4.c [2022-03-20 19:11:02,432 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 19:11:02,432 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 19:11:02,458 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 19:11:02,462 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-20 19:11:02,462 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 19:11:02,470 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 16 states have (on average 1.625) internal successors, (26), 17 states have internal predecessors, (26), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 19:11:02,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-03-20 19:11:02,475 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:11:02,475 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:11:02,476 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:11:02,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:11:02,479 INFO L85 PathProgramCache]: Analyzing trace with hash -1467912619, now seen corresponding path program 1 times [2022-03-20 19:11:02,484 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:11:02,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [794614274] [2022-03-20 19:11:02,491 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:11:02,491 INFO L85 PathProgramCache]: Analyzing trace with hash -1467912619, now seen corresponding path program 2 times [2022-03-20 19:11:02,492 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:11:02,493 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1310545415] [2022-03-20 19:11:02,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:11:02,493 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:11:02,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:11:02,574 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:11:02,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:11:02,585 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:11:02,586 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:11:02,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1310545415] [2022-03-20 19:11:02,586 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1310545415] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:11:02,587 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:11:02,587 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 19:11:02,588 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:11:02,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [794614274] [2022-03-20 19:11:02,589 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [794614274] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:11:02,589 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:11:02,589 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 19:11:02,589 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283682637] [2022-03-20 19:11:02,589 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:11:02,592 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-20 19:11:02,592 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:11:02,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-20 19:11:02,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 19:11:02,609 INFO L87 Difference]: Start difference. First operand has 22 states, 16 states have (on average 1.625) internal successors, (26), 17 states have internal predecessors, (26), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:11:02,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:11:02,629 INFO L93 Difference]: Finished difference Result 38 states and 54 transitions. [2022-03-20 19:11:02,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-20 19:11:02,630 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2022-03-20 19:11:02,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:11:02,635 INFO L225 Difference]: With dead ends: 38 [2022-03-20 19:11:02,635 INFO L226 Difference]: Without dead ends: 17 [2022-03-20 19:11:02,636 INFO L912 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 [2022-03-20 19:11:02,638 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 18 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:11:02,639 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 28 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:11:02,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-03-20 19:11:02,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-03-20 19:11:02,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:11:02,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2022-03-20 19:11:02,659 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 9 [2022-03-20 19:11:02,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:11:02,660 INFO L478 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2022-03-20 19:11:02,660 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:11:02,660 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2022-03-20 19:11:02,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-03-20 19:11:02,660 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:11:02,661 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:11:02,661 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 19:11:02,661 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:11:02,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:11:02,661 INFO L85 PathProgramCache]: Analyzing trace with hash -1467952981, now seen corresponding path program 1 times [2022-03-20 19:11:02,662 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:11:02,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [586644251] [2022-03-20 19:11:02,662 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:11:02,662 INFO L85 PathProgramCache]: Analyzing trace with hash -1467952981, now seen corresponding path program 2 times [2022-03-20 19:11:02,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:11:02,663 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1857979471] [2022-03-20 19:11:02,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:11:02,663 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:11:02,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:11:02,699 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:11:02,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:11:02,707 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:11:02,707 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:11:02,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1857979471] [2022-03-20 19:11:02,708 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1857979471] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:11:02,708 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:11:02,708 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:11:02,708 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:11:02,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [586644251] [2022-03-20 19:11:02,708 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [586644251] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:11:02,708 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:11:02,708 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:11:02,709 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815704900] [2022-03-20 19:11:02,709 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:11:02,709 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-20 19:11:02,709 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:11:02,710 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-20 19:11:02,710 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-20 19:11:02,710 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:11:02,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:11:02,774 INFO L93 Difference]: Finished difference Result 28 states and 34 transitions. [2022-03-20 19:11:02,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-20 19:11:02,774 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2022-03-20 19:11:02,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:11:02,775 INFO L225 Difference]: With dead ends: 28 [2022-03-20 19:11:02,775 INFO L226 Difference]: Without dead ends: 25 [2022-03-20 19:11:02,775 INFO L912 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 [2022-03-20 19:11:02,776 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 35 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:11:02,783 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 25 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:11:02,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-03-20 19:11:02,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 18. [2022-03-20 19:11:02,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:11:02,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2022-03-20 19:11:02,788 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 9 [2022-03-20 19:11:02,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:11:02,788 INFO L478 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2022-03-20 19:11:02,789 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:11:02,789 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2022-03-20 19:11:02,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-03-20 19:11:02,789 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:11:02,789 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:11:02,789 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-20 19:11:02,789 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:11:02,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:11:02,790 INFO L85 PathProgramCache]: Analyzing trace with hash -408278750, now seen corresponding path program 1 times [2022-03-20 19:11:02,790 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:11:02,790 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1833191108] [2022-03-20 19:11:02,903 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 19:11:02,904 INFO L85 PathProgramCache]: Analyzing trace with hash 1739867075, now seen corresponding path program 1 times [2022-03-20 19:11:02,904 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:11:02,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165444350] [2022-03-20 19:11:02,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:11:02,906 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:11:02,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:11:02,967 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:11:02,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:11:02,981 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:11:02,981 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:11:02,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165444350] [2022-03-20 19:11:02,982 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1165444350] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:11:02,982 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:11:02,983 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:11:03,000 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:11:03,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1833191108] [2022-03-20 19:11:03,000 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1833191108] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:11:03,000 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:11:03,001 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 19:11:03,001 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669193472] [2022-03-20 19:11:03,001 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:11:03,002 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 19:11:03,002 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:11:03,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 19:11:03,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-03-20 19:11:03,004 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:11:03,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:11:03,075 INFO L93 Difference]: Finished difference Result 42 states and 54 transitions. [2022-03-20 19:11:03,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 19:11:03,076 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2022-03-20 19:11:03,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:11:03,077 INFO L225 Difference]: With dead ends: 42 [2022-03-20 19:11:03,077 INFO L226 Difference]: Without dead ends: 31 [2022-03-20 19:11:03,078 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2022-03-20 19:11:03,080 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 56 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:11:03,083 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 23 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:11:03,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-03-20 19:11:03,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 19. [2022-03-20 19:11:03,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:11:03,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2022-03-20 19:11:03,094 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 12 [2022-03-20 19:11:03,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:11:03,094 INFO L478 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2022-03-20 19:11:03,094 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:11:03,094 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2022-03-20 19:11:03,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-20 19:11:03,094 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:11:03,094 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:11:03,095 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-20 19:11:03,095 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:11:03,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:11:03,095 INFO L85 PathProgramCache]: Analyzing trace with hash 675904015, now seen corresponding path program 1 times [2022-03-20 19:11:03,095 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:11:03,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1359021247] [2022-03-20 19:11:03,354 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Basisvector must contain only constants! [2022-03-20 19:11:03,354 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 19:11:03,354 INFO L85 PathProgramCache]: Analyzing trace with hash 675904015, now seen corresponding path program 2 times [2022-03-20 19:11:03,354 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:11:03,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [172151514] [2022-03-20 19:11:03,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:11:03,355 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:11:03,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:11:03,401 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:11:03,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:11:03,408 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:11:03,409 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:11:03,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [172151514] [2022-03-20 19:11:03,409 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [172151514] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:11:03,409 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:11:03,409 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:11:03,410 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:11:03,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1359021247] [2022-03-20 19:11:03,410 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1359021247] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:11:03,410 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:11:03,410 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 19:11:03,410 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526277216] [2022-03-20 19:11:03,410 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:11:03,410 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-20 19:11:03,410 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:11:03,411 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-20 19:11:03,411 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-20 19:11:03,411 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:11:03,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:11:03,441 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2022-03-20 19:11:03,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-20 19:11:03,441 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-03-20 19:11:03,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:11:03,442 INFO L225 Difference]: With dead ends: 34 [2022-03-20 19:11:03,442 INFO L226 Difference]: Without dead ends: 23 [2022-03-20 19:11:03,444 INFO L912 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 [2022-03-20 19:11:03,447 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 23 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 19:11:03,449 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 25 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 19:11:03,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-20 19:11:03,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2022-03-20 19:11:03,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.25) internal successors, (20), 16 states have internal predecessors, (20), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:11:03,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2022-03-20 19:11:03,456 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 15 [2022-03-20 19:11:03,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:11:03,457 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2022-03-20 19:11:03,457 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 19:11:03,457 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2022-03-20 19:11:03,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-20 19:11:03,458 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:11:03,458 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 19:11:03,458 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-03-20 19:11:03,458 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:11:03,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:11:03,459 INFO L85 PathProgramCache]: Analyzing trace with hash 919301982, now seen corresponding path program 1 times [2022-03-20 19:11:03,460 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:11:03,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [153719951]