/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/loop-invgen/up.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 18:15:41,176 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 18:15:41,178 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 18:15:41,197 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 18:15:41,231 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 18:15:41,231 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 18:15:41,236 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 18:15:41,236 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-20 18:15:41,245 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 18:15:41,246 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 18:15:41,246 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 18:15:41,246 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 18:15:41,247 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 18:15:41,247 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 18:15:41,247 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 18:15:41,247 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 18:15:41,247 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 18:15:41,247 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 18:15:41,248 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 18:15:41,248 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 18:15:41,248 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 18:15:41,248 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 18:15:41,248 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 18:15:41,248 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 18:15:41,248 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 18:15:41,248 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 18:15:41,248 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 18:15:41,248 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 18:15:41,248 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 18:15:41,248 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-20 18:15:41,249 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 18:15:41,446 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 18:15:41,469 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 18:15:41,471 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 18:15:41,471 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 18:15:41,472 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 18:15:41,473 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/up.i [2022-03-20 18:15:41,520 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7ec555573/2d22f563516c44cb80946579c46a5c65/FLAG680781b82 [2022-03-20 18:15:41,913 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 18:15:41,913 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/up.i [2022-03-20 18:15:41,919 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7ec555573/2d22f563516c44cb80946579c46a5c65/FLAG680781b82 [2022-03-20 18:15:41,934 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7ec555573/2d22f563516c44cb80946579c46a5c65 [2022-03-20 18:15:41,936 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 18:15:41,937 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 18:15:41,939 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 18:15:41,939 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 18:15:41,941 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 18:15:41,942 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 06:15:41" (1/1) ... [2022-03-20 18:15:41,943 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6d7b161c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:41, skipping insertion in model container [2022-03-20 18:15:41,943 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 06:15:41" (1/1) ... [2022-03-20 18:15:41,948 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 18:15:41,961 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 18:15:42,101 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/up.i[893,906] [2022-03-20 18:15:42,126 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 18:15:42,131 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 18:15:42,140 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/up.i[893,906] [2022-03-20 18:15:42,143 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 18:15:42,154 INFO L208 MainTranslator]: Completed translation [2022-03-20 18:15:42,154 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:42 WrapperNode [2022-03-20 18:15:42,154 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 18:15:42,155 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 18:15:42,155 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 18:15:42,156 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 18:15:42,163 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:42" (1/1) ... [2022-03-20 18:15:42,163 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:42" (1/1) ... [2022-03-20 18:15:42,167 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:42" (1/1) ... [2022-03-20 18:15:42,168 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:42" (1/1) ... [2022-03-20 18:15:42,173 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:42" (1/1) ... [2022-03-20 18:15:42,178 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:42" (1/1) ... [2022-03-20 18:15:42,183 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:42" (1/1) ... [2022-03-20 18:15:42,187 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 18:15:42,188 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 18:15:42,188 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 18:15:42,188 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 18:15:42,189 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:42" (1/1) ... [2022-03-20 18:15:42,195 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 18:15:42,202 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:15:42,230 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-20 18:15:42,239 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-20 18:15:42,258 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 18:15:42,258 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 18:15:42,258 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 18:15:42,259 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-20 18:15:42,259 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 18:15:42,259 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 18:15:42,259 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 18:15:42,259 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 18:15:42,259 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2022-03-20 18:15:42,260 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2022-03-20 18:15:42,260 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 18:15:42,260 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 18:15:42,260 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-20 18:15:42,260 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 18:15:42,261 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-03-20 18:15:42,261 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 18:15:42,261 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 18:15:42,262 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 18:15:42,262 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 18:15:42,262 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 18:15:42,262 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 18:15:42,262 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 18:15:42,326 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 18:15:42,327 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 18:15:42,396 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 18:15:42,400 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 18:15:42,400 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-03-20 18:15:42,402 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 06:15:42 BoogieIcfgContainer [2022-03-20 18:15:42,402 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 18:15:42,403 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 18:15:42,403 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 18:15:42,405 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 18:15:42,405 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 06:15:41" (1/3) ... [2022-03-20 18:15:42,406 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b3d0ba2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 06:15:42, skipping insertion in model container [2022-03-20 18:15:42,406 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:15:42" (2/3) ... [2022-03-20 18:15:42,406 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b3d0ba2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 06:15:42, skipping insertion in model container [2022-03-20 18:15:42,406 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 06:15:42" (3/3) ... [2022-03-20 18:15:42,407 INFO L111 eAbstractionObserver]: Analyzing ICFG up.i [2022-03-20 18:15:42,411 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 18:15:42,411 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 18:15:42,439 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 18:15:42,444 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-20 18:15:42,444 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 18:15:42,453 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 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) [2022-03-20 18:15:42,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-03-20 18:15:42,458 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:42,458 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:42,459 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:42,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:42,463 INFO L85 PathProgramCache]: Analyzing trace with hash 661364838, now seen corresponding path program 1 times [2022-03-20 18:15:42,468 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:42,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1887883522] [2022-03-20 18:15:42,476 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:15:42,476 INFO L85 PathProgramCache]: Analyzing trace with hash 661364838, now seen corresponding path program 2 times [2022-03-20 18:15:42,478 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:42,478 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [520356605] [2022-03-20 18:15:42,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:42,479 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:42,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:42,653 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:42,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:42,664 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:42,665 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:42,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [520356605] [2022-03-20 18:15:42,665 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [520356605] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:42,666 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:42,666 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:15:42,667 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:42,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1887883522] [2022-03-20 18:15:42,668 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1887883522] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:42,668 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:42,668 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:15:42,668 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564753321] [2022-03-20 18:15:42,669 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:42,671 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 18:15:42,672 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:42,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 18:15:42,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-03-20 18:15:42,692 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 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 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:42,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:42,818 INFO L93 Difference]: Finished difference Result 40 states and 51 transitions. [2022-03-20 18:15:42,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 18:15:42,820 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2022-03-20 18:15:42,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:42,824 INFO L225 Difference]: With dead ends: 40 [2022-03-20 18:15:42,824 INFO L226 Difference]: Without dead ends: 18 [2022-03-20 18:15:42,826 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-03-20 18:15:42,830 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 26 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:42,833 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 33 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:15:42,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-03-20 18:15:42,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-03-20 18:15:42,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:42,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2022-03-20 18:15:42,864 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2022-03-20 18:15:42,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:42,864 INFO L478 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2022-03-20 18:15:42,865 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:42,865 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2022-03-20 18:15:42,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-03-20 18:15:42,866 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:42,866 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:42,866 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 18:15:42,867 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:42,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:42,869 INFO L85 PathProgramCache]: Analyzing trace with hash 1204460846, now seen corresponding path program 1 times [2022-03-20 18:15:42,869 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:42,869 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [730091403] [2022-03-20 18:15:43,149 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:43,151 INFO L85 PathProgramCache]: Analyzing trace with hash -768649777, now seen corresponding path program 1 times [2022-03-20 18:15:43,151 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:43,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [22590362] [2022-03-20 18:15:43,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:43,152 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:43,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:43,224 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:43,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:43,245 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:43,246 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:43,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [22590362] [2022-03-20 18:15:43,247 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [22590362] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:43,247 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:43,247 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:43,282 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:43,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [730091403] [2022-03-20 18:15:43,283 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [730091403] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:43,283 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:43,283 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:43,283 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811359194] [2022-03-20 18:15:43,283 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:43,285 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 18:15:43,285 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:43,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 18:15:43,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-03-20 18:15:43,286 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 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) [2022-03-20 18:15:43,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:43,343 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2022-03-20 18:15:43,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 18:15:43,343 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 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 [2022-03-20 18:15:43,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:43,345 INFO L225 Difference]: With dead ends: 29 [2022-03-20 18:15:43,345 INFO L226 Difference]: Without dead ends: 19 [2022-03-20 18:15:43,348 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2022-03-20 18:15:43,349 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:43,354 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 32 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:15:43,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-03-20 18:15:43,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-03-20 18:15:43,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:43,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2022-03-20 18:15:43,362 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2022-03-20 18:15:43,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:43,362 INFO L478 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2022-03-20 18:15:43,362 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 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) [2022-03-20 18:15:43,362 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2022-03-20 18:15:43,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-20 18:15:43,363 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:43,363 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:43,364 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-20 18:15:43,364 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:43,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:43,364 INFO L85 PathProgramCache]: Analyzing trace with hash 860567910, now seen corresponding path program 2 times [2022-03-20 18:15:43,364 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:43,364 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [86925537] [2022-03-20 18:15:43,477 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:43,478 INFO L85 PathProgramCache]: Analyzing trace with hash 197010959, now seen corresponding path program 1 times [2022-03-20 18:15:43,478 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:43,478 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1345350849] [2022-03-20 18:15:43,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:43,479 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:43,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:43,525 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:43,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:43,530 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:43,530 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:43,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1345350849] [2022-03-20 18:15:43,531 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1345350849] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:43,531 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:43,531 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:43,573 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:43,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [86925537] [2022-03-20 18:15:43,574 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [86925537] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:43,574 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:43,574 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:15:43,574 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [935023997] [2022-03-20 18:15:43,574 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:43,575 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:15:43,575 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:43,575 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:15:43,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2022-03-20 18:15:43,575 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:43,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:43,637 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2022-03-20 18:15:43,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 18:15:43,638 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-03-20 18:15:43,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:43,638 INFO L225 Difference]: With dead ends: 30 [2022-03-20 18:15:43,639 INFO L226 Difference]: Without dead ends: 20 [2022-03-20 18:15:43,639 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2022-03-20 18:15:43,640 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:43,640 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 37 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:15:43,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-03-20 18:15:43,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-03-20 18:15:43,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 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), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:43,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2022-03-20 18:15:43,643 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 15 [2022-03-20 18:15:43,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:43,643 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2022-03-20 18:15:43,644 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:43,644 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2022-03-20 18:15:43,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-03-20 18:15:43,644 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:43,644 INFO L499 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:43,644 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-20 18:15:43,644 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:43,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:43,645 INFO L85 PathProgramCache]: Analyzing trace with hash -1210178514, now seen corresponding path program 3 times [2022-03-20 18:15:43,645 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:43,645 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1255630347] [2022-03-20 18:15:43,808 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:15:43,808 INFO L85 PathProgramCache]: Analyzing trace with hash 1162671695, now seen corresponding path program 1 times [2022-03-20 18:15:43,809 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:15:43,809 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [459947657] [2022-03-20 18:15:43,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:15:43,809 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:15:43,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:43,866 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:15:43,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:15:43,878 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:15:43,878 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:15:43,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [459947657] [2022-03-20 18:15:43,878 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [459947657] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:43,878 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:43,878 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:15:43,923 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:15:43,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1255630347] [2022-03-20 18:15:43,924 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1255630347] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:15:43,925 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:15:43,925 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 18:15:43,925 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063946296] [2022-03-20 18:15:43,925 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:15:43,925 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 18:15:43,925 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:43,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 18:15:43,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-03-20 18:15:43,926 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 9 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:44,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:15:44,007 INFO L93 Difference]: Finished difference Result 31 states and 33 transitions. [2022-03-20 18:15:44,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 18:15:44,008 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2022-03-20 18:15:44,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:15:44,008 INFO L225 Difference]: With dead ends: 31 [2022-03-20 18:15:44,008 INFO L226 Difference]: Without dead ends: 21 [2022-03-20 18:15:44,009 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2022-03-20 18:15:44,009 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:15:44,010 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 47 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:15:44,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-03-20 18:15:44,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-03-20 18:15:44,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:15:44,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2022-03-20 18:15:44,013 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 16 [2022-03-20 18:15:44,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:15:44,013 INFO L478 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2022-03-20 18:15:44,015 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:15:44,015 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2022-03-20 18:15:44,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-20 18:15:44,016 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:15:44,016 INFO L499 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:15:44,016 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-03-20 18:15:44,017 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:15:44,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:15:44,028 INFO L85 PathProgramCache]: Analyzing trace with hash -978808218, now seen corresponding path program 4 times [2022-03-20 18:15:44,028 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:15:44,028 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [368653904]