/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loops/vogal-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 11:20:54,025 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 11:20:54,028 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 11:20:54,066 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 11:20:54,136 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 11:20:54,137 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 11:20:54,138 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 11:20:54,139 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-06 11:20:54,148 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 11:20:54,148 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 11:20:54,150 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 11:20:54,151 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 11:20:54,151 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 11:20:54,151 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 11:20:54,151 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 11:20:54,151 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 11:20:54,151 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 11:20:54,151 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 11:20:54,152 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 11:20:54,152 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 11:20:54,152 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 11:20:54,153 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 11:20:54,153 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 11:20:54,153 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 11:20:54,153 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 11:20:54,153 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 11:20:54,153 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:20:54,154 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 11:20:54,154 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 11:20:54,154 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 11:20:54,154 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 11:20:54,154 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 11:20:54,450 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 11:20:54,473 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 11:20:54,475 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 11:20:54,476 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 11:20:54,476 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 11:20:54,477 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/vogal-2.i [2021-05-06 11:20:54,540 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c5b5224a/5972f588097e4e3d925aa9f40cd8e7b6/FLAGd14a11de9 [2021-05-06 11:20:54,972 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 11:20:54,972 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/vogal-2.i [2021-05-06 11:20:54,978 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c5b5224a/5972f588097e4e3d925aa9f40cd8e7b6/FLAGd14a11de9 [2021-05-06 11:20:55,347 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4c5b5224a/5972f588097e4e3d925aa9f40cd8e7b6 [2021-05-06 11:20:55,355 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 11:20:55,357 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 11:20:55,360 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 11:20:55,360 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 11:20:55,363 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 11:20:55,364 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:20:55" (1/1) ... [2021-05-06 11:20:55,365 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@41f60f35 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:20:55, skipping insertion in model container [2021-05-06 11:20:55,365 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:20:55" (1/1) ... [2021-05-06 11:20:55,370 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 11:20:55,385 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 11:20:55,518 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/vogal-2.i[808,821] [2021-05-06 11:20:55,556 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:20:55,584 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 11:20:55,600 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/vogal-2.i[808,821] [2021-05-06 11:20:55,634 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:20:55,646 INFO L208 MainTranslator]: Completed translation [2021-05-06 11:20:55,647 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:20:55 WrapperNode [2021-05-06 11:20:55,647 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 11:20:55,648 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 11:20:55,648 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 11:20:55,649 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 11:20:55,658 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:20:55" (1/1) ... [2021-05-06 11:20:55,661 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:20:55" (1/1) ... [2021-05-06 11:20:55,676 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:20:55" (1/1) ... [2021-05-06 11:20:55,676 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:20:55" (1/1) ... [2021-05-06 11:20:55,683 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:20:55" (1/1) ... [2021-05-06 11:20:55,701 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:20:55" (1/1) ... [2021-05-06 11:20:55,702 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:20:55" (1/1) ... [2021-05-06 11:20:55,704 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 11:20:55,705 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 11:20:55,705 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 11:20:55,705 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 11:20:55,706 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:20:55" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:20:55,791 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 11:20:55,792 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 11:20:55,792 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 11:20:55,792 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 11:20:55,792 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 11:20:55,792 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 11:20:55,793 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 11:20:55,793 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-06 11:20:55,793 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-06 11:20:55,793 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 11:20:55,794 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 11:20:55,794 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 11:20:55,794 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2021-05-06 11:20:55,794 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 11:20:55,794 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 11:20:55,795 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 11:20:55,795 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 11:20:55,795 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 11:20:55,795 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 11:20:55,797 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 11:20:56,176 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 11:20:56,177 INFO L299 CfgBuilder]: Removed 6 assume(true) statements. [2021-05-06 11:20:56,178 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:20:56 BoogieIcfgContainer [2021-05-06 11:20:56,178 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 11:20:56,179 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 11:20:56,179 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 11:20:56,181 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 11:20:56,181 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 11:20:55" (1/3) ... [2021-05-06 11:20:56,182 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5cdd9334 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:20:56, skipping insertion in model container [2021-05-06 11:20:56,182 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:20:55" (2/3) ... [2021-05-06 11:20:56,182 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5cdd9334 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:20:56, skipping insertion in model container [2021-05-06 11:20:56,182 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:20:56" (3/3) ... [2021-05-06 11:20:56,183 INFO L111 eAbstractionObserver]: Analyzing ICFG vogal-2.i [2021-05-06 11:20:56,188 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 11:20:56,190 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 11:20:56,202 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 11:20:56,217 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 11:20:56,217 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 11:20:56,218 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 11:20:56,218 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 11:20:56,218 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 11:20:56,218 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 11:20:56,218 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 11:20:56,218 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 11:20:56,229 INFO L276 IsEmpty]: Start isEmpty. Operand has 36 states, 28 states have (on average 1.5714285714285714) internal successors, (44), 29 states have internal predecessors, (44), 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) [2021-05-06 11:20:56,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 11:20:56,235 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:56,236 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:56,236 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:56,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:56,240 INFO L82 PathProgramCache]: Analyzing trace with hash 1427166884, now seen corresponding path program 1 times [2021-05-06 11:20:56,247 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:56,247 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [699450611] [2021-05-06 11:20:56,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:56,297 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:56,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:56,429 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:56,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:56,449 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:56,450 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:56,452 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [699450611] [2021-05-06 11:20:56,453 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [699450611] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:56,454 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:56,454 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 11:20:56,455 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700971298] [2021-05-06 11:20:56,458 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 11:20:56,459 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:56,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 11:20:56,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:20:56,473 INFO L87 Difference]: Start difference. First operand has 36 states, 28 states have (on average 1.5714285714285714) internal successors, (44), 29 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:56,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:56,601 INFO L93 Difference]: Finished difference Result 64 states and 91 transitions. [2021-05-06 11:20:56,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 11:20:56,603 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-06 11:20:56,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:56,608 INFO L225 Difference]: With dead ends: 64 [2021-05-06 11:20:56,608 INFO L226 Difference]: Without dead ends: 29 [2021-05-06 11:20:56,612 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 44.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:20:56,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-06 11:20:56,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-05-06 11:20:56,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.3333333333333333) internal successors, (32), 24 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:56,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2021-05-06 11:20:56,653 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 17 [2021-05-06 11:20:56,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:56,654 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2021-05-06 11:20:56,654 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:56,654 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2021-05-06 11:20:56,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-06 11:20:56,655 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:56,655 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:56,656 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 11:20:56,656 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:56,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:56,657 INFO L82 PathProgramCache]: Analyzing trace with hash 1183431677, now seen corresponding path program 1 times [2021-05-06 11:20:56,657 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:56,658 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1226884583] [2021-05-06 11:20:56,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:56,665 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:56,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:56,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:56,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:56,854 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:56,855 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:56,855 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1226884583] [2021-05-06 11:20:56,855 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1226884583] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:56,855 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:56,855 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 11:20:56,856 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559982610] [2021-05-06 11:20:56,856 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 11:20:56,856 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:56,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 11:20:56,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 11:20:56,857 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 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) [2021-05-06 11:20:56,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:56,967 INFO L93 Difference]: Finished difference Result 65 states and 85 transitions. [2021-05-06 11:20:56,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 11:20:56,967 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 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 19 [2021-05-06 11:20:56,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:56,969 INFO L225 Difference]: With dead ends: 65 [2021-05-06 11:20:56,969 INFO L226 Difference]: Without dead ends: 44 [2021-05-06 11:20:56,971 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 44.6ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 11:20:56,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-06 11:20:56,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 30. [2021-05-06 11:20:56,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.32) internal successors, (33), 25 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:56,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2021-05-06 11:20:56,978 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 19 [2021-05-06 11:20:56,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:56,978 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2021-05-06 11:20:56,978 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 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) [2021-05-06 11:20:56,978 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2021-05-06 11:20:56,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-06 11:20:56,979 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:56,979 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:56,979 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 11:20:56,979 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:56,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:56,980 INFO L82 PathProgramCache]: Analyzing trace with hash -742748965, now seen corresponding path program 1 times [2021-05-06 11:20:56,980 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:56,980 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [417779157] [2021-05-06 11:20:56,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:56,997 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:56,997 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:56,998 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:57,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:57,079 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:57,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:57,085 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:57,085 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:57,085 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [417779157] [2021-05-06 11:20:57,085 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [417779157] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:57,086 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:57,086 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 11:20:57,086 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937011773] [2021-05-06 11:20:57,086 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 11:20:57,086 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:57,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 11:20:57,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:20:57,087 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 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) [2021-05-06 11:20:57,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:57,189 INFO L93 Difference]: Finished difference Result 80 states and 106 transitions. [2021-05-06 11:20:57,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 11:20:57,190 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 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 21 [2021-05-06 11:20:57,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:57,191 INFO L225 Difference]: With dead ends: 80 [2021-05-06 11:20:57,191 INFO L226 Difference]: Without dead ends: 59 [2021-05-06 11:20:57,191 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 36.5ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:20:57,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-06 11:20:57,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 32. [2021-05-06 11:20:57,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 27 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:57,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2021-05-06 11:20:57,197 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 21 [2021-05-06 11:20:57,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:57,198 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2021-05-06 11:20:57,198 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 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) [2021-05-06 11:20:57,198 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2021-05-06 11:20:57,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-06 11:20:57,198 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:57,199 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:57,199 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 11:20:57,199 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:57,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:57,199 INFO L82 PathProgramCache]: Analyzing trace with hash -671441351, now seen corresponding path program 2 times [2021-05-06 11:20:57,200 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:57,200 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [677471245] [2021-05-06 11:20:57,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:57,206 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:57,206 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:57,207 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:57,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:57,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:57,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:57,338 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:57,338 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:57,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [677471245] [2021-05-06 11:20:57,339 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [677471245] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:57,339 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:57,339 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 11:20:57,339 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1031913116] [2021-05-06 11:20:57,339 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 11:20:57,340 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:57,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 11:20:57,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:20:57,340 INFO L87 Difference]: Start difference. First operand 32 states and 39 transitions. Second operand has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 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) [2021-05-06 11:20:57,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:57,557 INFO L93 Difference]: Finished difference Result 95 states and 127 transitions. [2021-05-06 11:20:57,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 11:20:57,558 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 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 23 [2021-05-06 11:20:57,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:57,560 INFO L225 Difference]: With dead ends: 95 [2021-05-06 11:20:57,561 INFO L226 Difference]: Without dead ends: 74 [2021-05-06 11:20:57,562 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 53.6ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:20:57,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-06 11:20:57,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 34. [2021-05-06 11:20:57,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 29 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:57,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2021-05-06 11:20:57,575 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 23 [2021-05-06 11:20:57,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:57,575 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2021-05-06 11:20:57,576 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 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) [2021-05-06 11:20:57,576 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2021-05-06 11:20:57,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-06 11:20:57,577 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:57,577 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:57,577 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 11:20:57,577 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:57,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:57,578 INFO L82 PathProgramCache]: Analyzing trace with hash -864301033, now seen corresponding path program 3 times [2021-05-06 11:20:57,578 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:57,578 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1654319864] [2021-05-06 11:20:57,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:57,585 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:57,585 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:57,586 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:57,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:57,681 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:57,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:57,690 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:57,690 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:57,690 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1654319864] [2021-05-06 11:20:57,690 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1654319864] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:57,691 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:57,691 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 11:20:57,691 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [457384492] [2021-05-06 11:20:57,691 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 11:20:57,691 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:57,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 11:20:57,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:20:57,692 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 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) [2021-05-06 11:20:57,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:57,916 INFO L93 Difference]: Finished difference Result 110 states and 148 transitions. [2021-05-06 11:20:57,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 11:20:57,916 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 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 25 [2021-05-06 11:20:57,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:57,917 INFO L225 Difference]: With dead ends: 110 [2021-05-06 11:20:57,917 INFO L226 Difference]: Without dead ends: 89 [2021-05-06 11:20:57,918 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 55.8ms TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:20:57,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-06 11:20:57,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 36. [2021-05-06 11:20:57,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 31 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:57,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 43 transitions. [2021-05-06 11:20:57,923 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 43 transitions. Word has length 25 [2021-05-06 11:20:57,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:57,923 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 43 transitions. [2021-05-06 11:20:57,923 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 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) [2021-05-06 11:20:57,923 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 43 transitions. [2021-05-06 11:20:57,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-06 11:20:57,924 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:57,924 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:57,924 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-06 11:20:57,924 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:57,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:57,925 INFO L82 PathProgramCache]: Analyzing trace with hash -1518861707, now seen corresponding path program 4 times [2021-05-06 11:20:57,925 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:57,925 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [291679335] [2021-05-06 11:20:57,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:57,931 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:57,931 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:57,932 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:57,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:58,062 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:58,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:58,072 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:58,073 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:58,073 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [291679335] [2021-05-06 11:20:58,073 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [291679335] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:58,073 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:58,073 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 11:20:58,073 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529631920] [2021-05-06 11:20:58,075 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 11:20:58,075 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:58,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 11:20:58,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:20:58,076 INFO L87 Difference]: Start difference. First operand 36 states and 43 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 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) [2021-05-06 11:20:58,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:58,344 INFO L93 Difference]: Finished difference Result 125 states and 169 transitions. [2021-05-06 11:20:58,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:20:58,345 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 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 27 [2021-05-06 11:20:58,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:58,346 INFO L225 Difference]: With dead ends: 125 [2021-05-06 11:20:58,346 INFO L226 Difference]: Without dead ends: 104 [2021-05-06 11:20:58,346 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 63.1ms TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:20:58,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-05-06 11:20:58,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 38. [2021-05-06 11:20:58,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 33 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:58,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 45 transitions. [2021-05-06 11:20:58,352 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 45 transitions. Word has length 27 [2021-05-06 11:20:58,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:58,352 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 45 transitions. [2021-05-06 11:20:58,352 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 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) [2021-05-06 11:20:58,353 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 45 transitions. [2021-05-06 11:20:58,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-06 11:20:58,353 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:58,353 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:58,353 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-06 11:20:58,354 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:58,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:58,354 INFO L82 PathProgramCache]: Analyzing trace with hash 808523091, now seen corresponding path program 5 times [2021-05-06 11:20:58,354 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:58,354 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [352192424] [2021-05-06 11:20:58,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:58,359 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:58,359 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:58,360 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:58,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:58,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:58,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:58,473 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:58,474 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:58,474 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [352192424] [2021-05-06 11:20:58,474 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [352192424] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:58,474 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:58,474 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:20:58,474 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1367560117] [2021-05-06 11:20:58,475 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:20:58,475 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:58,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:20:58,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:20:58,476 INFO L87 Difference]: Start difference. First operand 38 states and 45 transitions. Second operand has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 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) [2021-05-06 11:20:58,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:58,811 INFO L93 Difference]: Finished difference Result 140 states and 190 transitions. [2021-05-06 11:20:58,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:20:58,812 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 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 29 [2021-05-06 11:20:58,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:58,813 INFO L225 Difference]: With dead ends: 140 [2021-05-06 11:20:58,813 INFO L226 Difference]: Without dead ends: 119 [2021-05-06 11:20:58,814 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 70.6ms TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:20:58,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-05-06 11:20:58,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 40. [2021-05-06 11:20:58,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.2285714285714286) internal successors, (43), 35 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:58,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 47 transitions. [2021-05-06 11:20:58,819 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 47 transitions. Word has length 29 [2021-05-06 11:20:58,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:58,819 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 47 transitions. [2021-05-06 11:20:58,819 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 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) [2021-05-06 11:20:58,819 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 47 transitions. [2021-05-06 11:20:58,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-06 11:20:58,820 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:58,820 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:58,820 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-06 11:20:58,820 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:58,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:58,820 INFO L82 PathProgramCache]: Analyzing trace with hash -252647247, now seen corresponding path program 6 times [2021-05-06 11:20:58,821 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:58,821 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [516681667] [2021-05-06 11:20:58,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:58,826 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:58,826 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:58,827 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:58,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:58,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:58,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:58,960 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:58,960 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:58,960 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [516681667] [2021-05-06 11:20:58,960 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [516681667] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:58,961 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:58,961 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:20:58,961 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386798084] [2021-05-06 11:20:58,961 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:20:58,961 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:58,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:20:58,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:20:58,962 INFO L87 Difference]: Start difference. First operand 40 states and 47 transitions. Second operand has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 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) [2021-05-06 11:20:59,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:59,338 INFO L93 Difference]: Finished difference Result 155 states and 211 transitions. [2021-05-06 11:20:59,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 11:20:59,339 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 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 31 [2021-05-06 11:20:59,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:59,340 INFO L225 Difference]: With dead ends: 155 [2021-05-06 11:20:59,340 INFO L226 Difference]: Without dead ends: 134 [2021-05-06 11:20:59,340 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 86.3ms TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:20:59,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-06 11:20:59,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 42. [2021-05-06 11:20:59,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 37 states have (on average 1.2162162162162162) internal successors, (45), 37 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:59,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2021-05-06 11:20:59,345 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 31 [2021-05-06 11:20:59,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:59,345 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2021-05-06 11:20:59,345 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 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) [2021-05-06 11:20:59,346 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2021-05-06 11:20:59,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-06 11:20:59,346 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:59,346 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:59,347 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-06 11:20:59,347 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:59,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:59,347 INFO L82 PathProgramCache]: Analyzing trace with hash -2130092913, now seen corresponding path program 7 times [2021-05-06 11:20:59,347 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:59,348 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [409235078] [2021-05-06 11:20:59,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:59,352 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:59,352 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:59,353 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:20:59,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:59,509 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:20:59,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:20:59,520 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:20:59,521 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:20:59,521 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [409235078] [2021-05-06 11:20:59,521 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [409235078] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:20:59,523 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:20:59,523 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:20:59,524 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247683059] [2021-05-06 11:20:59,524 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:20:59,526 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:20:59,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:20:59,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:20:59,527 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 10 states have internal predecessors, (29), 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) [2021-05-06 11:21:00,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:00,012 INFO L93 Difference]: Finished difference Result 170 states and 232 transitions. [2021-05-06 11:21:00,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:21:00,013 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 10 states have internal predecessors, (29), 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 33 [2021-05-06 11:21:00,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:00,014 INFO L225 Difference]: With dead ends: 170 [2021-05-06 11:21:00,014 INFO L226 Difference]: Without dead ends: 149 [2021-05-06 11:21:00,015 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 96.8ms TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:21:00,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-06 11:21:00,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 44. [2021-05-06 11:21:00,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.205128205128205) internal successors, (47), 39 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:00,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 51 transitions. [2021-05-06 11:21:00,020 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 51 transitions. Word has length 33 [2021-05-06 11:21:00,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:00,020 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 51 transitions. [2021-05-06 11:21:00,020 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 10 states have internal predecessors, (29), 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) [2021-05-06 11:21:00,021 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 51 transitions. [2021-05-06 11:21:00,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-06 11:21:00,021 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:00,021 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:00,021 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-06 11:21:00,022 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:00,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:00,022 INFO L82 PathProgramCache]: Analyzing trace with hash 1825853677, now seen corresponding path program 8 times [2021-05-06 11:21:00,022 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:00,022 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [858668261] [2021-05-06 11:21:00,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:00,027 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:00,027 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:00,028 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:00,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:00,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:00,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:00,174 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:00,174 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:00,174 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [858668261] [2021-05-06 11:21:00,175 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [858668261] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:00,175 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:00,175 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 11:21:00,175 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678319812] [2021-05-06 11:21:00,175 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 11:21:00,175 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:00,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 11:21:00,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:21:00,176 INFO L87 Difference]: Start difference. First operand 44 states and 51 transitions. Second operand has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 11 states have internal predecessors, (31), 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) [2021-05-06 11:21:00,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:00,767 INFO L93 Difference]: Finished difference Result 185 states and 253 transitions. [2021-05-06 11:21:00,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 11:21:00,767 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 11 states have internal predecessors, (31), 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 35 [2021-05-06 11:21:00,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:00,768 INFO L225 Difference]: With dead ends: 185 [2021-05-06 11:21:00,768 INFO L226 Difference]: Without dead ends: 164 [2021-05-06 11:21:00,769 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 100.9ms TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:21:00,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-05-06 11:21:00,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 46. [2021-05-06 11:21:00,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.1951219512195121) internal successors, (49), 41 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:00,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 53 transitions. [2021-05-06 11:21:00,774 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 53 transitions. Word has length 35 [2021-05-06 11:21:00,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:00,774 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 53 transitions. [2021-05-06 11:21:00,774 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 11 states have internal predecessors, (31), 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) [2021-05-06 11:21:00,774 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 53 transitions. [2021-05-06 11:21:00,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 11:21:00,775 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:00,775 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:00,775 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-06 11:21:00,775 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:00,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:00,776 INFO L82 PathProgramCache]: Analyzing trace with hash -1850497589, now seen corresponding path program 9 times [2021-05-06 11:21:00,776 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:00,776 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1483452009] [2021-05-06 11:21:00,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:00,781 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:00,781 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:00,782 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:00,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:00,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:00,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:00,948 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:00,948 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:00,948 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1483452009] [2021-05-06 11:21:00,948 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1483452009] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:00,948 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:00,948 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:21:00,949 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130867371] [2021-05-06 11:21:00,949 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:21:00,949 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:00,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:21:00,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:21:00,950 INFO L87 Difference]: Start difference. First operand 46 states and 53 transitions. Second operand has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 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) [2021-05-06 11:21:01,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:01,632 INFO L93 Difference]: Finished difference Result 200 states and 274 transitions. [2021-05-06 11:21:01,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:21:01,632 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 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 37 [2021-05-06 11:21:01,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:01,633 INFO L225 Difference]: With dead ends: 200 [2021-05-06 11:21:01,633 INFO L226 Difference]: Without dead ends: 179 [2021-05-06 11:21:01,634 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 114.1ms TimeCoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:21:01,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-05-06 11:21:01,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 48. [2021-05-06 11:21:01,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 43 states have (on average 1.186046511627907) internal successors, (51), 43 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:01,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 55 transitions. [2021-05-06 11:21:01,639 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 55 transitions. Word has length 37 [2021-05-06 11:21:01,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:01,639 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 55 transitions. [2021-05-06 11:21:01,639 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 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) [2021-05-06 11:21:01,639 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 55 transitions. [2021-05-06 11:21:01,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-06 11:21:01,640 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:01,640 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:01,640 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-05-06 11:21:01,640 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:01,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:01,641 INFO L82 PathProgramCache]: Analyzing trace with hash -65979607, now seen corresponding path program 10 times [2021-05-06 11:21:01,641 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:01,641 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [870590902] [2021-05-06 11:21:01,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:01,646 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:01,646 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:01,647 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:01,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:01,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:01,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:01,745 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:01,745 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:01,745 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [870590902] [2021-05-06 11:21:01,745 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [870590902] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:01,745 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:01,746 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 11:21:01,746 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161529884] [2021-05-06 11:21:01,746 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 11:21:01,746 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:01,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 11:21:01,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:21:01,747 INFO L87 Difference]: Start difference. First operand 48 states and 55 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 5 states have internal predecessors, (17), 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) [2021-05-06 11:21:01,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:01,833 INFO L93 Difference]: Finished difference Result 72 states and 87 transitions. [2021-05-06 11:21:01,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 11:21:01,834 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 5 states have internal predecessors, (17), 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 39 [2021-05-06 11:21:01,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:01,834 INFO L225 Difference]: With dead ends: 72 [2021-05-06 11:21:01,835 INFO L226 Difference]: Without dead ends: 67 [2021-05-06 11:21:01,835 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 60.4ms TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:21:01,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-05-06 11:21:01,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 60. [2021-05-06 11:21:01,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 55 states have (on average 1.2363636363636363) internal successors, (68), 55 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:01,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2021-05-06 11:21:01,840 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 39 [2021-05-06 11:21:01,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:01,840 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2021-05-06 11:21:01,840 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 5 states have internal predecessors, (17), 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) [2021-05-06 11:21:01,841 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2021-05-06 11:21:01,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-06 11:21:01,841 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:01,841 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:01,841 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-06 11:21:01,841 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:01,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:01,842 INFO L82 PathProgramCache]: Analyzing trace with hash -2124486910, now seen corresponding path program 1 times [2021-05-06 11:21:01,842 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:01,842 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [337521786] [2021-05-06 11:21:01,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:01,854 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:01,854 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:01,855 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:01,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:01,915 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:01,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:01,920 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:01,920 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:01,920 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [337521786] [2021-05-06 11:21:01,920 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [337521786] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:01,920 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:01,920 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 11:21:01,920 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431536508] [2021-05-06 11:21:01,921 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 11:21:01,921 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:01,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 11:21:01,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:21:01,921 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 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) [2021-05-06 11:21:01,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:01,982 INFO L93 Difference]: Finished difference Result 113 states and 151 transitions. [2021-05-06 11:21:01,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 11:21:01,982 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 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 45 [2021-05-06 11:21:01,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:01,983 INFO L225 Difference]: With dead ends: 113 [2021-05-06 11:21:01,983 INFO L226 Difference]: Without dead ends: 84 [2021-05-06 11:21:01,983 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 28.2ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:21:01,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-06 11:21:01,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 76. [2021-05-06 11:21:01,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.2394366197183098) internal successors, (88), 71 states have internal predecessors, (88), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:01,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 92 transitions. [2021-05-06 11:21:01,989 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 92 transitions. Word has length 45 [2021-05-06 11:21:01,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:01,989 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 92 transitions. [2021-05-06 11:21:01,990 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 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) [2021-05-06 11:21:01,990 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 92 transitions. [2021-05-06 11:21:01,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-06 11:21:01,990 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:01,990 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:01,991 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-05-06 11:21:01,991 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:01,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:01,991 INFO L82 PathProgramCache]: Analyzing trace with hash -1273709643, now seen corresponding path program 2 times [2021-05-06 11:21:01,991 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:01,991 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2073819085] [2021-05-06 11:21:01,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:01,996 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:01,996 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:01,997 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:02,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:02,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:02,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:02,137 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:02,137 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:02,137 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2073819085] [2021-05-06 11:21:02,137 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2073819085] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:02,137 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:02,137 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 11:21:02,137 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204729733] [2021-05-06 11:21:02,138 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 11:21:02,138 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:02,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 11:21:02,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:21:02,138 INFO L87 Difference]: Start difference. First operand 76 states and 92 transitions. Second operand has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 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) [2021-05-06 11:21:02,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:02,222 INFO L93 Difference]: Finished difference Result 141 states and 183 transitions. [2021-05-06 11:21:02,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 11:21:02,224 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 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 48 [2021-05-06 11:21:02,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:02,225 INFO L225 Difference]: With dead ends: 141 [2021-05-06 11:21:02,225 INFO L226 Difference]: Without dead ends: 96 [2021-05-06 11:21:02,226 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 37.7ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:21:02,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-06 11:21:02,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 88. [2021-05-06 11:21:02,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 83 states have (on average 1.2530120481927711) internal successors, (104), 83 states have internal predecessors, (104), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:02,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 108 transitions. [2021-05-06 11:21:02,232 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 108 transitions. Word has length 48 [2021-05-06 11:21:02,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:02,232 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 108 transitions. [2021-05-06 11:21:02,232 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 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) [2021-05-06 11:21:02,232 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 108 transitions. [2021-05-06 11:21:02,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 11:21:02,233 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:02,233 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:02,233 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-06 11:21:02,233 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:02,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:02,234 INFO L82 PathProgramCache]: Analyzing trace with hash -370162142, now seen corresponding path program 3 times [2021-05-06 11:21:02,234 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:02,234 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1560039679] [2021-05-06 11:21:02,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:02,238 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:02,239 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:02,240 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:02,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:02,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:02,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:02,327 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:02,327 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:02,328 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1560039679] [2021-05-06 11:21:02,328 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1560039679] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:02,328 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:02,328 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 11:21:02,328 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607995416] [2021-05-06 11:21:02,328 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 11:21:02,328 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:02,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 11:21:02,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:21:02,329 INFO L87 Difference]: Start difference. First operand 88 states and 108 transitions. Second operand has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 6 states have internal predecessors, (29), 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) [2021-05-06 11:21:02,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:02,439 INFO L93 Difference]: Finished difference Result 165 states and 215 transitions. [2021-05-06 11:21:02,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 11:21:02,440 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 6 states have internal predecessors, (29), 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 51 [2021-05-06 11:21:02,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:02,441 INFO L225 Difference]: With dead ends: 165 [2021-05-06 11:21:02,441 INFO L226 Difference]: Without dead ends: 108 [2021-05-06 11:21:02,441 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 44.8ms TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:21:02,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-06 11:21:02,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 100. [2021-05-06 11:21:02,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 95 states have (on average 1.263157894736842) internal successors, (120), 95 states have internal predecessors, (120), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:02,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 124 transitions. [2021-05-06 11:21:02,448 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 124 transitions. Word has length 51 [2021-05-06 11:21:02,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:02,448 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 124 transitions. [2021-05-06 11:21:02,448 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 6 states have internal predecessors, (29), 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) [2021-05-06 11:21:02,448 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 124 transitions. [2021-05-06 11:21:02,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-06 11:21:02,449 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:02,449 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:02,449 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-06 11:21:02,450 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:02,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:02,450 INFO L82 PathProgramCache]: Analyzing trace with hash 653396117, now seen corresponding path program 4 times [2021-05-06 11:21:02,450 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:02,450 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1268356049] [2021-05-06 11:21:02,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:02,456 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:02,456 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:02,457 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:02,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:02,547 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:02,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:02,550 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:02,551 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:02,551 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1268356049] [2021-05-06 11:21:02,551 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1268356049] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:02,551 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:02,551 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 11:21:02,551 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596231364] [2021-05-06 11:21:02,551 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 11:21:02,551 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:02,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 11:21:02,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:21:02,552 INFO L87 Difference]: Start difference. First operand 100 states and 124 transitions. Second operand has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 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) [2021-05-06 11:21:02,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:02,683 INFO L93 Difference]: Finished difference Result 189 states and 247 transitions. [2021-05-06 11:21:02,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:21:02,683 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 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 54 [2021-05-06 11:21:02,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:02,684 INFO L225 Difference]: With dead ends: 189 [2021-05-06 11:21:02,684 INFO L226 Difference]: Without dead ends: 120 [2021-05-06 11:21:02,685 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 53.1ms TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:21:02,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-05-06 11:21:02,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 112. [2021-05-06 11:21:02,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 107 states have (on average 1.2710280373831775) internal successors, (136), 107 states have internal predecessors, (136), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:02,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 140 transitions. [2021-05-06 11:21:02,692 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 140 transitions. Word has length 54 [2021-05-06 11:21:02,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:02,692 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 140 transitions. [2021-05-06 11:21:02,693 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 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) [2021-05-06 11:21:02,693 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 140 transitions. [2021-05-06 11:21:02,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-06 11:21:02,693 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:02,693 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:02,694 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-05-06 11:21:02,694 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:02,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:02,694 INFO L82 PathProgramCache]: Analyzing trace with hash -790311614, now seen corresponding path program 5 times [2021-05-06 11:21:02,694 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:02,694 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1697996967] [2021-05-06 11:21:02,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:02,699 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:02,699 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:02,700 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:02,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:02,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:02,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:02,817 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:02,817 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:02,817 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1697996967] [2021-05-06 11:21:02,817 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1697996967] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:02,817 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:02,817 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:21:02,817 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1841920812] [2021-05-06 11:21:02,818 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:21:02,818 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:02,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:21:02,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:21:02,818 INFO L87 Difference]: Start difference. First operand 112 states and 140 transitions. Second operand has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 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) [2021-05-06 11:21:03,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:03,018 INFO L93 Difference]: Finished difference Result 213 states and 279 transitions. [2021-05-06 11:21:03,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:21:03,018 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 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 57 [2021-05-06 11:21:03,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:03,019 INFO L225 Difference]: With dead ends: 213 [2021-05-06 11:21:03,019 INFO L226 Difference]: Without dead ends: 132 [2021-05-06 11:21:03,020 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 71.4ms TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:21:03,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-05-06 11:21:03,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 124. [2021-05-06 11:21:03,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 119 states have (on average 1.2773109243697478) internal successors, (152), 119 states have internal predecessors, (152), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:03,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 156 transitions. [2021-05-06 11:21:03,027 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 156 transitions. Word has length 57 [2021-05-06 11:21:03,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:03,027 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 156 transitions. [2021-05-06 11:21:03,027 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 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) [2021-05-06 11:21:03,028 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 156 transitions. [2021-05-06 11:21:03,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-06 11:21:03,028 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:03,028 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:03,028 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-05-06 11:21:03,029 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:03,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:03,029 INFO L82 PathProgramCache]: Analyzing trace with hash -484823691, now seen corresponding path program 6 times [2021-05-06 11:21:03,029 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:03,029 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1872646621] [2021-05-06 11:21:03,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:03,035 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:03,035 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:03,036 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:03,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:03,151 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:03,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:03,155 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:03,155 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:03,155 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1872646621] [2021-05-06 11:21:03,155 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1872646621] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:03,155 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:03,156 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:21:03,156 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170604329] [2021-05-06 11:21:03,156 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:21:03,156 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:03,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:21:03,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:21:03,157 INFO L87 Difference]: Start difference. First operand 124 states and 156 transitions. Second operand has 10 states, 10 states have (on average 3.8) internal successors, (38), 9 states have internal predecessors, (38), 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) [2021-05-06 11:21:03,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:03,360 INFO L93 Difference]: Finished difference Result 237 states and 311 transitions. [2021-05-06 11:21:03,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 11:21:03,360 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 9 states have internal predecessors, (38), 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 60 [2021-05-06 11:21:03,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:03,361 INFO L225 Difference]: With dead ends: 237 [2021-05-06 11:21:03,361 INFO L226 Difference]: Without dead ends: 144 [2021-05-06 11:21:03,362 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 74.4ms TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:21:03,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-05-06 11:21:03,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 136. [2021-05-06 11:21:03,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 131 states have (on average 1.282442748091603) internal successors, (168), 131 states have internal predecessors, (168), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:03,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 172 transitions. [2021-05-06 11:21:03,370 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 172 transitions. Word has length 60 [2021-05-06 11:21:03,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:03,371 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 172 transitions. [2021-05-06 11:21:03,371 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 9 states have internal predecessors, (38), 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) [2021-05-06 11:21:03,371 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 172 transitions. [2021-05-06 11:21:03,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-06 11:21:03,371 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:03,372 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:03,372 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-06 11:21:03,372 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:03,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:03,372 INFO L82 PathProgramCache]: Analyzing trace with hash -729809822, now seen corresponding path program 7 times [2021-05-06 11:21:03,372 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:03,372 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1639004060] [2021-05-06 11:21:03,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:03,378 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:03,378 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:03,380 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:03,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:03,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:03,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:03,553 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:03,553 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:03,553 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1639004060] [2021-05-06 11:21:03,553 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1639004060] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:03,553 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:03,554 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:21:03,554 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1852860417] [2021-05-06 11:21:03,554 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:21:03,554 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:03,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:21:03,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:21:03,555 INFO L87 Difference]: Start difference. First operand 136 states and 172 transitions. Second operand has 11 states, 11 states have (on average 3.727272727272727) internal successors, (41), 10 states have internal predecessors, (41), 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) [2021-05-06 11:21:03,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:03,810 INFO L93 Difference]: Finished difference Result 261 states and 343 transitions. [2021-05-06 11:21:03,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:21:03,810 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.727272727272727) internal successors, (41), 10 states have internal predecessors, (41), 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 63 [2021-05-06 11:21:03,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:03,811 INFO L225 Difference]: With dead ends: 261 [2021-05-06 11:21:03,811 INFO L226 Difference]: Without dead ends: 156 [2021-05-06 11:21:03,812 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 100.4ms TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:21:03,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-05-06 11:21:03,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 148. [2021-05-06 11:21:03,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 143 states have (on average 1.2867132867132867) internal successors, (184), 143 states have internal predecessors, (184), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:03,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 188 transitions. [2021-05-06 11:21:03,820 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 188 transitions. Word has length 63 [2021-05-06 11:21:03,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:03,821 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 188 transitions. [2021-05-06 11:21:03,821 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.727272727272727) internal successors, (41), 10 states have internal predecessors, (41), 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) [2021-05-06 11:21:03,821 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 188 transitions. [2021-05-06 11:21:03,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-06 11:21:03,821 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:03,821 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:03,822 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-05-06 11:21:03,822 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:03,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:03,822 INFO L82 PathProgramCache]: Analyzing trace with hash -1962202539, now seen corresponding path program 8 times [2021-05-06 11:21:03,822 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:03,822 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [650175271] [2021-05-06 11:21:03,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:03,827 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:03,828 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:03,828 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:03,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:03,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:03,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:03,911 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:03,912 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:03,912 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [650175271] [2021-05-06 11:21:03,912 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [650175271] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:03,912 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:03,912 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 11:21:03,912 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061237048] [2021-05-06 11:21:03,912 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 11:21:03,912 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:03,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 11:21:03,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 11:21:03,913 INFO L87 Difference]: Start difference. First operand 148 states and 188 transitions. Second operand has 4 states, 4 states have (on average 5.75) internal successors, (23), 3 states have internal predecessors, (23), 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) [2021-05-06 11:21:03,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:03,970 INFO L93 Difference]: Finished difference Result 327 states and 426 transitions. [2021-05-06 11:21:03,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 11:21:03,971 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.75) internal successors, (23), 3 states have internal predecessors, (23), 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 66 [2021-05-06 11:21:03,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:03,972 INFO L225 Difference]: With dead ends: 327 [2021-05-06 11:21:03,972 INFO L226 Difference]: Without dead ends: 210 [2021-05-06 11:21:03,972 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 20.3ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 11:21:03,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2021-05-06 11:21:03,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 152. [2021-05-06 11:21:03,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 147 states have (on average 1.2857142857142858) internal successors, (189), 147 states have internal predecessors, (189), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:03,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 193 transitions. [2021-05-06 11:21:03,982 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 193 transitions. Word has length 66 [2021-05-06 11:21:03,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:03,982 INFO L480 AbstractCegarLoop]: Abstraction has 152 states and 193 transitions. [2021-05-06 11:21:03,982 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 5.75) internal successors, (23), 3 states have internal predecessors, (23), 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) [2021-05-06 11:21:03,982 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 193 transitions. [2021-05-06 11:21:03,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 11:21:03,983 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:03,983 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:03,983 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-05-06 11:21:03,983 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:03,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:03,983 INFO L82 PathProgramCache]: Analyzing trace with hash 1992147995, now seen corresponding path program 1 times [2021-05-06 11:21:03,983 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:03,984 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [45906229] [2021-05-06 11:21:03,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:03,988 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:03,989 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:03,989 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:04,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:04,143 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:04,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:04,149 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:04,149 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:04,149 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [45906229] [2021-05-06 11:21:04,149 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [45906229] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:04,149 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:04,149 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 11:21:04,149 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319652462] [2021-05-06 11:21:04,150 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 11:21:04,150 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:04,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 11:21:04,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:21:04,151 INFO L87 Difference]: Start difference. First operand 152 states and 193 transitions. Second operand has 12 states, 12 states have (on average 3.75) internal successors, (45), 11 states have internal predecessors, (45), 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) [2021-05-06 11:21:04,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:04,471 INFO L93 Difference]: Finished difference Result 244 states and 318 transitions. [2021-05-06 11:21:04,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 11:21:04,472 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.75) internal successors, (45), 11 states have internal predecessors, (45), 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 67 [2021-05-06 11:21:04,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:04,472 INFO L225 Difference]: With dead ends: 244 [2021-05-06 11:21:04,473 INFO L226 Difference]: Without dead ends: 183 [2021-05-06 11:21:04,473 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 103.9ms TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:21:04,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2021-05-06 11:21:04,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 158. [2021-05-06 11:21:04,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 153 states have (on average 1.2875816993464053) internal successors, (197), 153 states have internal predecessors, (197), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:04,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 201 transitions. [2021-05-06 11:21:04,481 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 201 transitions. Word has length 67 [2021-05-06 11:21:04,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:04,481 INFO L480 AbstractCegarLoop]: Abstraction has 158 states and 201 transitions. [2021-05-06 11:21:04,481 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.75) internal successors, (45), 11 states have internal predecessors, (45), 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) [2021-05-06 11:21:04,481 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 201 transitions. [2021-05-06 11:21:04,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-06 11:21:04,482 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:04,482 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:04,482 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-05-06 11:21:04,482 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:04,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:04,482 INFO L82 PathProgramCache]: Analyzing trace with hash -480387238, now seen corresponding path program 1 times [2021-05-06 11:21:04,483 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:04,483 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1662311583] [2021-05-06 11:21:04,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:04,488 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:04,488 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:04,489 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:04,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:04,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:04,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:04,779 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:04,779 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:04,779 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1662311583] [2021-05-06 11:21:04,780 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1662311583] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:04,780 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:04,780 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:21:04,780 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [334852982] [2021-05-06 11:21:04,780 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:21:04,780 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:04,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:21:04,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:21:04,781 INFO L87 Difference]: Start difference. First operand 158 states and 201 transitions. Second operand has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 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) [2021-05-06 11:21:04,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:04,932 INFO L93 Difference]: Finished difference Result 341 states and 443 transitions. [2021-05-06 11:21:04,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:21:04,933 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 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 68 [2021-05-06 11:21:04,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:04,935 INFO L225 Difference]: With dead ends: 341 [2021-05-06 11:21:04,935 INFO L226 Difference]: Without dead ends: 336 [2021-05-06 11:21:04,935 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 146.9ms TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:21:04,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 336 states. [2021-05-06 11:21:04,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 336 to 160. [2021-05-06 11:21:04,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 155 states have (on average 1.2838709677419355) internal successors, (199), 155 states have internal predecessors, (199), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:04,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 203 transitions. [2021-05-06 11:21:04,950 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 203 transitions. Word has length 68 [2021-05-06 11:21:04,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:04,951 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 203 transitions. [2021-05-06 11:21:04,951 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 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) [2021-05-06 11:21:04,951 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 203 transitions. [2021-05-06 11:21:04,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-06 11:21:04,952 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:04,952 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:04,952 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-05-06 11:21:04,952 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:04,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:04,952 INFO L82 PathProgramCache]: Analyzing trace with hash 1762866155, now seen corresponding path program 2 times [2021-05-06 11:21:04,953 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:04,953 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1917495919] [2021-05-06 11:21:04,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:04,957 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:04,957 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:04,959 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:04,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:05,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:05,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:05,130 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:05,130 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:05,130 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1917495919] [2021-05-06 11:21:05,131 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1917495919] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:05,131 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:05,131 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:21:05,131 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984197219] [2021-05-06 11:21:05,131 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:21:05,131 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:05,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:21:05,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:21:05,132 INFO L87 Difference]: Start difference. First operand 160 states and 203 transitions. Second operand has 13 states, 13 states have (on average 3.6923076923076925) internal successors, (48), 12 states have internal predecessors, (48), 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) [2021-05-06 11:21:05,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:05,458 INFO L93 Difference]: Finished difference Result 299 states and 389 transitions. [2021-05-06 11:21:05,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:21:05,459 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.6923076923076925) internal successors, (48), 12 states have internal predecessors, (48), 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 70 [2021-05-06 11:21:05,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:05,460 INFO L225 Difference]: With dead ends: 299 [2021-05-06 11:21:05,460 INFO L226 Difference]: Without dead ends: 174 [2021-05-06 11:21:05,461 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 118.4ms TimeCoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:21:05,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2021-05-06 11:21:05,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 166. [2021-05-06 11:21:05,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 161 states have (on average 1.2732919254658386) internal successors, (205), 161 states have internal predecessors, (205), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:05,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 209 transitions. [2021-05-06 11:21:05,475 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 209 transitions. Word has length 70 [2021-05-06 11:21:05,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:05,475 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 209 transitions. [2021-05-06 11:21:05,475 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.6923076923076925) internal successors, (48), 12 states have internal predecessors, (48), 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) [2021-05-06 11:21:05,475 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 209 transitions. [2021-05-06 11:21:05,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 11:21:05,489 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:05,490 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:05,490 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-05-06 11:21:05,490 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:05,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:05,490 INFO L82 PathProgramCache]: Analyzing trace with hash 225571355, now seen corresponding path program 3 times [2021-05-06 11:21:05,491 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:05,491 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1236126492] [2021-05-06 11:21:05,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:05,495 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:05,496 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:05,496 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:05,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:05,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:05,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:05,887 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:05,888 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:05,888 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1236126492] [2021-05-06 11:21:05,888 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1236126492] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:05,888 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:05,888 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:21:05,888 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556948090] [2021-05-06 11:21:05,888 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:21:05,888 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:05,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:21:05,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:21:05,889 INFO L87 Difference]: Start difference. First operand 166 states and 209 transitions. Second operand has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 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) [2021-05-06 11:21:06,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:06,021 INFO L93 Difference]: Finished difference Result 242 states and 307 transitions. [2021-05-06 11:21:06,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:21:06,022 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 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 73 [2021-05-06 11:21:06,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:06,023 INFO L225 Difference]: With dead ends: 242 [2021-05-06 11:21:06,023 INFO L226 Difference]: Without dead ends: 164 [2021-05-06 11:21:06,024 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 239.6ms TimeCoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:21:06,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-05-06 11:21:06,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 164. [2021-05-06 11:21:06,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 159 states have (on average 1.270440251572327) internal successors, (202), 159 states have internal predecessors, (202), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:06,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 206 transitions. [2021-05-06 11:21:06,039 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 206 transitions. Word has length 73 [2021-05-06 11:21:06,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:06,040 INFO L480 AbstractCegarLoop]: Abstraction has 164 states and 206 transitions. [2021-05-06 11:21:06,040 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 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) [2021-05-06 11:21:06,040 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 206 transitions. [2021-05-06 11:21:06,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-06 11:21:06,041 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:06,041 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:06,041 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-05-06 11:21:06,041 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:06,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:06,041 INFO L82 PathProgramCache]: Analyzing trace with hash 1358921078, now seen corresponding path program 1 times [2021-05-06 11:21:06,041 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:06,041 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2080135353] [2021-05-06 11:21:06,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:06,047 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:06,048 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:06,050 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:06,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:06,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:06,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:06,172 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:06,172 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:06,172 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2080135353] [2021-05-06 11:21:06,172 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2080135353] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:06,172 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:06,172 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 11:21:06,172 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671621306] [2021-05-06 11:21:06,173 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 11:21:06,173 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:06,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 11:21:06,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:21:06,173 INFO L87 Difference]: Start difference. First operand 164 states and 206 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 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) [2021-05-06 11:21:06,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:06,379 INFO L93 Difference]: Finished difference Result 732 states and 956 transitions. [2021-05-06 11:21:06,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:21:06,380 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 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 75 [2021-05-06 11:21:06,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:06,383 INFO L225 Difference]: With dead ends: 732 [2021-05-06 11:21:06,383 INFO L226 Difference]: Without dead ends: 658 [2021-05-06 11:21:06,383 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 62.6ms TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:21:06,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 658 states. [2021-05-06 11:21:06,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 658 to 170. [2021-05-06 11:21:06,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 165 states have (on average 1.2727272727272727) internal successors, (210), 165 states have internal predecessors, (210), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:06,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 214 transitions. [2021-05-06 11:21:06,411 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 214 transitions. Word has length 75 [2021-05-06 11:21:06,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:06,411 INFO L480 AbstractCegarLoop]: Abstraction has 170 states and 214 transitions. [2021-05-06 11:21:06,411 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 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) [2021-05-06 11:21:06,411 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 214 transitions. [2021-05-06 11:21:06,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 11:21:06,412 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:06,412 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:06,412 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-05-06 11:21:06,412 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:06,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:06,413 INFO L82 PathProgramCache]: Analyzing trace with hash 1210713068, now seen corresponding path program 2 times [2021-05-06 11:21:06,413 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:06,413 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1460446591] [2021-05-06 11:21:06,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:06,419 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:06,419 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:06,420 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:06,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:06,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:06,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:06,560 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:06,560 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:06,560 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1460446591] [2021-05-06 11:21:06,561 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1460446591] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:06,561 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:06,561 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:21:06,561 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98996858] [2021-05-06 11:21:06,561 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:21:06,561 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:06,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:21:06,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:21:06,563 INFO L87 Difference]: Start difference. First operand 170 states and 214 transitions. Second operand has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 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) [2021-05-06 11:21:06,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:06,908 INFO L93 Difference]: Finished difference Result 994 states and 1302 transitions. [2021-05-06 11:21:06,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 11:21:06,908 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 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 79 [2021-05-06 11:21:06,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:06,912 INFO L225 Difference]: With dead ends: 994 [2021-05-06 11:21:06,912 INFO L226 Difference]: Without dead ends: 920 [2021-05-06 11:21:06,912 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 81.7ms TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:21:06,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 920 states. [2021-05-06 11:21:06,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 920 to 174. [2021-05-06 11:21:06,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 169 states have (on average 1.2781065088757397) internal successors, (216), 169 states have internal predecessors, (216), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:06,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 220 transitions. [2021-05-06 11:21:06,943 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 220 transitions. Word has length 79 [2021-05-06 11:21:06,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:06,943 INFO L480 AbstractCegarLoop]: Abstraction has 174 states and 220 transitions. [2021-05-06 11:21:06,943 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 8 states have internal predecessors, (29), 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) [2021-05-06 11:21:06,943 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 220 transitions. [2021-05-06 11:21:06,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-06 11:21:06,944 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:06,944 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:06,944 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-05-06 11:21:06,944 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:06,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:06,945 INFO L82 PathProgramCache]: Analyzing trace with hash 18898786, now seen corresponding path program 3 times [2021-05-06 11:21:06,945 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:06,945 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1593297995] [2021-05-06 11:21:06,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:06,951 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:06,951 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:06,952 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:07,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:07,141 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:07,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:07,144 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:07,145 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:07,145 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1593297995] [2021-05-06 11:21:07,145 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1593297995] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:07,145 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:07,145 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:21:07,145 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [101652199] [2021-05-06 11:21:07,145 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:21:07,145 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:07,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:21:07,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:21:07,146 INFO L87 Difference]: Start difference. First operand 174 states and 220 transitions. Second operand has 11 states, 11 states have (on average 3.0) internal successors, (33), 10 states have internal predecessors, (33), 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) [2021-05-06 11:21:07,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:07,647 INFO L93 Difference]: Finished difference Result 1256 states and 1648 transitions. [2021-05-06 11:21:07,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 11:21:07,647 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.0) internal successors, (33), 10 states have internal predecessors, (33), 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 83 [2021-05-06 11:21:07,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:07,652 INFO L225 Difference]: With dead ends: 1256 [2021-05-06 11:21:07,652 INFO L226 Difference]: Without dead ends: 1182 [2021-05-06 11:21:07,653 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 115.0ms TimeCoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:21:07,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1182 states. [2021-05-06 11:21:07,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1182 to 178. [2021-05-06 11:21:07,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 173 states have (on average 1.283236994219653) internal successors, (222), 173 states have internal predecessors, (222), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:07,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 226 transitions. [2021-05-06 11:21:07,718 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 226 transitions. Word has length 83 [2021-05-06 11:21:07,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:07,718 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 226 transitions. [2021-05-06 11:21:07,718 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.0) internal successors, (33), 10 states have internal predecessors, (33), 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) [2021-05-06 11:21:07,718 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 226 transitions. [2021-05-06 11:21:07,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-05-06 11:21:07,719 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:07,719 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:07,719 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-05-06 11:21:07,719 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:07,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:07,719 INFO L82 PathProgramCache]: Analyzing trace with hash 1475350488, now seen corresponding path program 4 times [2021-05-06 11:21:07,719 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:07,720 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1913164827] [2021-05-06 11:21:07,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:07,724 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:07,724 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:07,725 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:07,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:07,906 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:07,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:07,911 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:07,911 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:07,911 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1913164827] [2021-05-06 11:21:07,911 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1913164827] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:07,911 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:07,911 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:21:07,911 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [368322251] [2021-05-06 11:21:07,911 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:21:07,911 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:07,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:21:07,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:21:07,912 INFO L87 Difference]: Start difference. First operand 178 states and 226 transitions. Second operand has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 states have internal predecessors, (37), 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) [2021-05-06 11:21:08,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:08,639 INFO L93 Difference]: Finished difference Result 1518 states and 1994 transitions. [2021-05-06 11:21:08,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 11:21:08,640 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 states have internal predecessors, (37), 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 87 [2021-05-06 11:21:08,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:08,645 INFO L225 Difference]: With dead ends: 1518 [2021-05-06 11:21:08,645 INFO L226 Difference]: Without dead ends: 1444 [2021-05-06 11:21:08,646 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 136.5ms TimeCoverageRelationStatistics Valid=30, Invalid=152, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:21:08,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1444 states. [2021-05-06 11:21:08,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1444 to 182. [2021-05-06 11:21:08,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 177 states have (on average 1.2881355932203389) internal successors, (228), 177 states have internal predecessors, (228), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:08,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 232 transitions. [2021-05-06 11:21:08,689 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 232 transitions. Word has length 87 [2021-05-06 11:21:08,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:08,689 INFO L480 AbstractCegarLoop]: Abstraction has 182 states and 232 transitions. [2021-05-06 11:21:08,690 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 states have internal predecessors, (37), 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) [2021-05-06 11:21:08,690 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 232 transitions. [2021-05-06 11:21:08,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-06 11:21:08,690 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:08,690 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:08,691 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-05-06 11:21:08,691 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:08,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:08,691 INFO L82 PathProgramCache]: Analyzing trace with hash 1709610318, now seen corresponding path program 5 times [2021-05-06 11:21:08,691 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:08,691 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1984796367] [2021-05-06 11:21:08,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:08,699 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:08,699 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:08,700 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:08,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:08,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:08,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:08,946 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:08,946 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:08,946 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1984796367] [2021-05-06 11:21:08,946 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1984796367] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:08,946 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:08,946 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:21:08,946 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007356413] [2021-05-06 11:21:08,947 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:21:08,947 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:08,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:21:08,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:21:08,947 INFO L87 Difference]: Start difference. First operand 182 states and 232 transitions. Second operand has 15 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 14 states have internal predecessors, (41), 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) [2021-05-06 11:21:09,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:09,975 INFO L93 Difference]: Finished difference Result 1780 states and 2340 transitions. [2021-05-06 11:21:09,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 11:21:09,976 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 14 states have internal predecessors, (41), 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 91 [2021-05-06 11:21:09,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:09,982 INFO L225 Difference]: With dead ends: 1780 [2021-05-06 11:21:09,982 INFO L226 Difference]: Without dead ends: 1706 [2021-05-06 11:21:09,984 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 177.2ms TimeCoverageRelationStatistics Valid=34, Invalid=206, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:21:09,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1706 states. [2021-05-06 11:21:10,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1706 to 186. [2021-05-06 11:21:10,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 181 states have (on average 1.292817679558011) internal successors, (234), 181 states have internal predecessors, (234), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:10,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 238 transitions. [2021-05-06 11:21:10,048 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 238 transitions. Word has length 91 [2021-05-06 11:21:10,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:10,048 INFO L480 AbstractCegarLoop]: Abstraction has 186 states and 238 transitions. [2021-05-06 11:21:10,048 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.7333333333333334) internal successors, (41), 14 states have internal predecessors, (41), 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) [2021-05-06 11:21:10,048 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 238 transitions. [2021-05-06 11:21:10,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-06 11:21:10,049 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:10,049 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 10, 10, 10, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:10,049 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-05-06 11:21:10,050 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:10,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:10,050 INFO L82 PathProgramCache]: Analyzing trace with hash -510562364, now seen corresponding path program 6 times [2021-05-06 11:21:10,050 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:10,050 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1569696052] [2021-05-06 11:21:10,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:10,054 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:10,055 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:10,056 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:10,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:10,335 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:10,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:10,338 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:10,338 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:10,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1569696052] [2021-05-06 11:21:10,338 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1569696052] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:10,338 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:10,338 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:21:10,338 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [829084076] [2021-05-06 11:21:10,339 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:21:10,340 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:10,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:21:10,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=239, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:21:10,340 INFO L87 Difference]: Start difference. First operand 186 states and 238 transitions. Second operand has 17 states, 17 states have (on average 2.6470588235294117) internal successors, (45), 16 states have internal predecessors, (45), 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) [2021-05-06 11:21:11,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:11,737 INFO L93 Difference]: Finished difference Result 2042 states and 2686 transitions. [2021-05-06 11:21:11,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 11:21:11,738 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.6470588235294117) internal successors, (45), 16 states have internal predecessors, (45), 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 95 [2021-05-06 11:21:11,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:11,744 INFO L225 Difference]: With dead ends: 2042 [2021-05-06 11:21:11,744 INFO L226 Difference]: Without dead ends: 1968 [2021-05-06 11:21:11,746 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 211.3ms TimeCoverageRelationStatistics Valid=38, Invalid=268, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:21:11,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1968 states. [2021-05-06 11:21:11,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1968 to 190. [2021-05-06 11:21:11,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 185 states have (on average 1.2972972972972974) internal successors, (240), 185 states have internal predecessors, (240), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:11,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 244 transitions. [2021-05-06 11:21:11,820 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 244 transitions. Word has length 95 [2021-05-06 11:21:11,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:11,821 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 244 transitions. [2021-05-06 11:21:11,821 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.6470588235294117) internal successors, (45), 16 states have internal predecessors, (45), 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) [2021-05-06 11:21:11,821 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 244 transitions. [2021-05-06 11:21:11,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-06 11:21:11,822 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:11,822 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 10, 10, 10, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:11,822 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-05-06 11:21:11,822 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:11,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:11,822 INFO L82 PathProgramCache]: Analyzing trace with hash 2126389050, now seen corresponding path program 7 times [2021-05-06 11:21:11,823 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:11,823 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1659714903] [2021-05-06 11:21:11,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:11,827 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:11,827 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:11,830 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:11,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:12,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:12,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:12,155 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:12,156 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:12,156 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1659714903] [2021-05-06 11:21:12,156 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1659714903] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:12,156 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:12,156 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:21:12,156 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063408774] [2021-05-06 11:21:12,156 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:21:12,156 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:12,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:21:12,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:21:12,157 INFO L87 Difference]: Start difference. First operand 190 states and 244 transitions. Second operand has 18 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 17 states have internal predecessors, (49), 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) [2021-05-06 11:21:13,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:13,793 INFO L93 Difference]: Finished difference Result 2057 states and 2705 transitions. [2021-05-06 11:21:13,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 11:21:13,794 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 17 states have internal predecessors, (49), 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 99 [2021-05-06 11:21:13,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:13,801 INFO L225 Difference]: With dead ends: 2057 [2021-05-06 11:21:13,801 INFO L226 Difference]: Without dead ends: 1983 [2021-05-06 11:21:13,802 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 232.7ms TimeCoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:21:13,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1983 states. [2021-05-06 11:21:13,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1983 to 192. [2021-05-06 11:21:13,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 187 states have (on average 1.2994652406417113) internal successors, (243), 187 states have internal predecessors, (243), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:13,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 247 transitions. [2021-05-06 11:21:13,881 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 247 transitions. Word has length 99 [2021-05-06 11:21:13,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:13,882 INFO L480 AbstractCegarLoop]: Abstraction has 192 states and 247 transitions. [2021-05-06 11:21:13,882 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 17 states have internal predecessors, (49), 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) [2021-05-06 11:21:13,882 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 247 transitions. [2021-05-06 11:21:13,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-06 11:21:13,883 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:13,883 INFO L523 BasicCegarLoop]: trace histogram [15, 14, 10, 10, 10, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:13,883 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-05-06 11:21:13,883 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:13,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:13,884 INFO L82 PathProgramCache]: Analyzing trace with hash -1611342123, now seen corresponding path program 8 times [2021-05-06 11:21:13,884 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:13,884 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1375137031] [2021-05-06 11:21:13,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:13,888 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:13,889 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:13,890 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:13,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:14,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:14,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:14,202 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:14,203 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:14,203 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1375137031] [2021-05-06 11:21:14,203 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1375137031] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:14,203 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:14,203 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 11:21:14,203 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904273235] [2021-05-06 11:21:14,204 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 11:21:14,204 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:14,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 11:21:14,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:21:14,204 INFO L87 Difference]: Start difference. First operand 192 states and 247 transitions. Second operand has 19 states, 19 states have (on average 2.6842105263157894) internal successors, (51), 18 states have internal predecessors, (51), 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) [2021-05-06 11:21:15,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:15,870 INFO L93 Difference]: Finished difference Result 2188 states and 2878 transitions. [2021-05-06 11:21:15,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 11:21:15,870 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.6842105263157894) internal successors, (51), 18 states have internal predecessors, (51), 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 101 [2021-05-06 11:21:15,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:15,876 INFO L225 Difference]: With dead ends: 2188 [2021-05-06 11:21:15,876 INFO L226 Difference]: Without dead ends: 2114 [2021-05-06 11:21:15,878 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 210.9ms TimeCoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:21:15,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2114 states. [2021-05-06 11:21:15,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2114 to 194. [2021-05-06 11:21:15,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 189 states have (on average 1.3015873015873016) internal successors, (246), 189 states have internal predecessors, (246), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:15,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 250 transitions. [2021-05-06 11:21:15,971 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 250 transitions. Word has length 101 [2021-05-06 11:21:15,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:15,972 INFO L480 AbstractCegarLoop]: Abstraction has 194 states and 250 transitions. [2021-05-06 11:21:15,972 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.6842105263157894) internal successors, (51), 18 states have internal predecessors, (51), 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) [2021-05-06 11:21:15,972 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 250 transitions. [2021-05-06 11:21:15,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:21:15,973 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:15,973 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 8, 8, 8, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:15,973 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-05-06 11:21:15,973 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:15,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:15,974 INFO L82 PathProgramCache]: Analyzing trace with hash -1408087540, now seen corresponding path program 1 times [2021-05-06 11:21:15,974 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:15,974 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1173502371] [2021-05-06 11:21:15,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:15,978 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:15,978 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:15,979 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:16,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:16,745 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:16,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:16,763 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:16,763 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:16,763 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1173502371] [2021-05-06 11:21:16,763 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1173502371] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:16,763 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:16,763 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:21:16,763 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797686300] [2021-05-06 11:21:16,764 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:21:16,764 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:16,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:21:16,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:21:16,764 INFO L87 Difference]: Start difference. First operand 194 states and 250 transitions. Second operand has 15 states, 15 states have (on average 3.4) internal successors, (51), 14 states have internal predecessors, (51), 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) [2021-05-06 11:21:17,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:17,556 INFO L93 Difference]: Finished difference Result 276 states and 356 transitions. [2021-05-06 11:21:17,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:21:17,557 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.4) internal successors, (51), 14 states have internal predecessors, (51), 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 102 [2021-05-06 11:21:17,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:17,558 INFO L225 Difference]: With dead ends: 276 [2021-05-06 11:21:17,558 INFO L226 Difference]: Without dead ends: 207 [2021-05-06 11:21:17,558 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 786.0ms TimeCoverageRelationStatistics Valid=68, Invalid=438, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:21:17,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2021-05-06 11:21:17,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 206. [2021-05-06 11:21:17,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 201 states have (on average 1.2985074626865671) internal successors, (261), 201 states have internal predecessors, (261), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:17,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 265 transitions. [2021-05-06 11:21:17,650 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 265 transitions. Word has length 102 [2021-05-06 11:21:17,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:17,651 INFO L480 AbstractCegarLoop]: Abstraction has 206 states and 265 transitions. [2021-05-06 11:21:17,651 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 3.4) internal successors, (51), 14 states have internal predecessors, (51), 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) [2021-05-06 11:21:17,651 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 265 transitions. [2021-05-06 11:21:17,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:21:17,651 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:17,652 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 8, 8, 7, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:17,652 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-05-06 11:21:17,652 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:17,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:17,652 INFO L82 PathProgramCache]: Analyzing trace with hash 520185162, now seen corresponding path program 1 times [2021-05-06 11:21:17,652 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:17,652 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2030109038] [2021-05-06 11:21:17,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:17,656 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:17,657 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:17,657 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:17,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:18,265 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 37 [2021-05-06 11:21:19,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:19,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:19,635 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:19,635 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:19,635 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2030109038] [2021-05-06 11:21:19,635 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2030109038] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:19,635 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:19,635 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 11:21:19,635 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813731759] [2021-05-06 11:21:19,636 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 11:21:19,636 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:19,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 11:21:19,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:21:19,637 INFO L87 Difference]: Start difference. First operand 206 states and 265 transitions. Second operand has 25 states, 25 states have (on average 2.84) internal successors, (71), 24 states have internal predecessors, (71), 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) [2021-05-06 11:21:20,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:20,899 INFO L93 Difference]: Finished difference Result 489 states and 636 transitions. [2021-05-06 11:21:20,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 11:21:20,900 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.84) internal successors, (71), 24 states have internal predecessors, (71), 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 102 [2021-05-06 11:21:20,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:20,901 INFO L225 Difference]: With dead ends: 489 [2021-05-06 11:21:20,901 INFO L226 Difference]: Without dead ends: 450 [2021-05-06 11:21:20,902 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 13 SyntacticMatches, 6 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 399 ImplicationChecksByTransitivity, 1878.4ms TimeCoverageRelationStatistics Valid=279, Invalid=1701, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 11:21:20,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 450 states. [2021-05-06 11:21:21,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 450 to 298. [2021-05-06 11:21:21,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 298 states, 293 states have (on average 1.3037542662116042) internal successors, (382), 293 states have internal predecessors, (382), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:21,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 386 transitions. [2021-05-06 11:21:21,030 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 386 transitions. Word has length 102 [2021-05-06 11:21:21,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:21,031 INFO L480 AbstractCegarLoop]: Abstraction has 298 states and 386 transitions. [2021-05-06 11:21:21,031 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.84) internal successors, (71), 24 states have internal predecessors, (71), 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) [2021-05-06 11:21:21,031 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 386 transitions. [2021-05-06 11:21:21,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:21:21,032 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:21,032 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 8, 8, 7, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:21,032 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-05-06 11:21:21,032 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:21,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:21,033 INFO L82 PathProgramCache]: Analyzing trace with hash 127158152, now seen corresponding path program 1 times [2021-05-06 11:21:21,033 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:21,033 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [962440061] [2021-05-06 11:21:21,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:21,037 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:21,037 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:21,038 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:21,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:21,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:21,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:21,595 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:21,595 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:21,595 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [962440061] [2021-05-06 11:21:21,596 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [962440061] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:21,596 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:21,596 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:21:21,596 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693328654] [2021-05-06 11:21:21,596 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:21:21,596 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:21,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:21:21,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:21:21,597 INFO L87 Difference]: Start difference. First operand 298 states and 386 transitions. Second operand has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 12 states have internal predecessors, (46), 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) [2021-05-06 11:21:22,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:22,173 INFO L93 Difference]: Finished difference Result 450 states and 582 transitions. [2021-05-06 11:21:22,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 11:21:22,174 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 12 states have internal predecessors, (46), 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 102 [2021-05-06 11:21:22,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:22,175 INFO L225 Difference]: With dead ends: 450 [2021-05-06 11:21:22,175 INFO L226 Difference]: Without dead ends: 298 [2021-05-06 11:21:22,176 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 590.5ms TimeCoverageRelationStatistics Valid=73, Invalid=347, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:21:22,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2021-05-06 11:21:22,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 298. [2021-05-06 11:21:22,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 298 states, 293 states have (on average 1.2969283276450512) internal successors, (380), 293 states have internal predecessors, (380), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:22,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 384 transitions. [2021-05-06 11:21:22,317 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 384 transitions. Word has length 102 [2021-05-06 11:21:22,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:22,317 INFO L480 AbstractCegarLoop]: Abstraction has 298 states and 384 transitions. [2021-05-06 11:21:22,317 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 12 states have internal predecessors, (46), 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) [2021-05-06 11:21:22,318 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 384 transitions. [2021-05-06 11:21:22,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:21:22,318 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:22,319 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 8, 8, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:22,319 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-05-06 11:21:22,319 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:22,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:22,319 INFO L82 PathProgramCache]: Analyzing trace with hash 1513943562, now seen corresponding path program 2 times [2021-05-06 11:21:22,319 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:22,319 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [751251519] [2021-05-06 11:21:22,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:22,324 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:22,324 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:22,325 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:22,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:22,900 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:22,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:22,904 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:22,904 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:22,904 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [751251519] [2021-05-06 11:21:22,905 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [751251519] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:22,905 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:22,905 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:21:22,905 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712801712] [2021-05-06 11:21:22,905 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:21:22,905 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:22,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:21:22,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=152, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:21:22,906 INFO L87 Difference]: Start difference. First operand 298 states and 384 transitions. Second operand has 14 states, 14 states have (on average 3.5) internal successors, (49), 13 states have internal predecessors, (49), 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) [2021-05-06 11:21:23,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:23,654 INFO L93 Difference]: Finished difference Result 450 states and 578 transitions. [2021-05-06 11:21:23,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:21:23,654 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.5) internal successors, (49), 13 states have internal predecessors, (49), 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 102 [2021-05-06 11:21:23,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:23,655 INFO L225 Difference]: With dead ends: 450 [2021-05-06 11:21:23,655 INFO L226 Difference]: Without dead ends: 298 [2021-05-06 11:21:23,656 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 665.5ms TimeCoverageRelationStatistics Valid=81, Invalid=425, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:21:23,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2021-05-06 11:21:23,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 298. [2021-05-06 11:21:23,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 298 states, 293 states have (on average 1.2901023890784984) internal successors, (378), 293 states have internal predecessors, (378), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:23,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 382 transitions. [2021-05-06 11:21:23,786 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 382 transitions. Word has length 102 [2021-05-06 11:21:23,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:23,786 INFO L480 AbstractCegarLoop]: Abstraction has 298 states and 382 transitions. [2021-05-06 11:21:23,786 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.5) internal successors, (49), 13 states have internal predecessors, (49), 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) [2021-05-06 11:21:23,786 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 382 transitions. [2021-05-06 11:21:23,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:21:23,787 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:23,787 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 8, 8, 5, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:23,787 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-05-06 11:21:23,787 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:23,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:23,788 INFO L82 PathProgramCache]: Analyzing trace with hash -1242683704, now seen corresponding path program 3 times [2021-05-06 11:21:23,788 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:23,788 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1255039060] [2021-05-06 11:21:23,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:23,792 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:23,792 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:23,793 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:23,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:24,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:24,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:24,425 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:24,426 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:24,426 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1255039060] [2021-05-06 11:21:24,426 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1255039060] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:24,426 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:24,426 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:21:24,426 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764407097] [2021-05-06 11:21:24,427 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:21:24,427 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:24,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:21:24,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=153, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:21:24,428 INFO L87 Difference]: Start difference. First operand 298 states and 382 transitions. Second operand has 14 states, 14 states have (on average 3.642857142857143) internal successors, (51), 13 states have internal predecessors, (51), 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) [2021-05-06 11:21:25,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:25,036 INFO L93 Difference]: Finished difference Result 450 states and 574 transitions. [2021-05-06 11:21:25,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 11:21:25,036 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.642857142857143) internal successors, (51), 13 states have internal predecessors, (51), 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 102 [2021-05-06 11:21:25,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:25,037 INFO L225 Difference]: With dead ends: 450 [2021-05-06 11:21:25,037 INFO L226 Difference]: Without dead ends: 298 [2021-05-06 11:21:25,038 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 625.7ms TimeCoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:21:25,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2021-05-06 11:21:25,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 298. [2021-05-06 11:21:25,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 298 states, 293 states have (on average 1.2832764505119454) internal successors, (376), 293 states have internal predecessors, (376), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:25,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 380 transitions. [2021-05-06 11:21:25,147 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 380 transitions. Word has length 102 [2021-05-06 11:21:25,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:25,148 INFO L480 AbstractCegarLoop]: Abstraction has 298 states and 380 transitions. [2021-05-06 11:21:25,148 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.642857142857143) internal successors, (51), 13 states have internal predecessors, (51), 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) [2021-05-06 11:21:25,148 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 380 transitions. [2021-05-06 11:21:25,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:21:25,149 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:25,149 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 8, 8, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:25,149 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2021-05-06 11:21:25,149 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:25,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:25,149 INFO L82 PathProgramCache]: Analyzing trace with hash -1258202422, now seen corresponding path program 4 times [2021-05-06 11:21:25,149 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:25,149 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [46585735] [2021-05-06 11:21:25,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:25,154 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:25,154 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:25,155 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:25,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:26,683 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:26,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:26,687 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:26,687 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:26,687 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [46585735] [2021-05-06 11:21:26,687 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [46585735] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:26,687 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:26,687 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 11:21:26,687 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84825651] [2021-05-06 11:21:26,688 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 11:21:26,688 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:26,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 11:21:26,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:21:26,688 INFO L87 Difference]: Start difference. First operand 298 states and 380 transitions. Second operand has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 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) [2021-05-06 11:21:27,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:27,166 INFO L93 Difference]: Finished difference Result 653 states and 837 transitions. [2021-05-06 11:21:27,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 11:21:27,166 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 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 102 [2021-05-06 11:21:27,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:27,168 INFO L225 Difference]: With dead ends: 653 [2021-05-06 11:21:27,168 INFO L226 Difference]: Without dead ends: 599 [2021-05-06 11:21:27,168 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 1115.4ms TimeCoverageRelationStatistics Valid=97, Invalid=323, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:21:27,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 599 states. [2021-05-06 11:21:27,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 599 to 377. [2021-05-06 11:21:27,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 377 states, 372 states have (on average 1.271505376344086) internal successors, (473), 372 states have internal predecessors, (473), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:27,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 477 transitions. [2021-05-06 11:21:27,372 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 477 transitions. Word has length 102 [2021-05-06 11:21:27,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:27,373 INFO L480 AbstractCegarLoop]: Abstraction has 377 states and 477 transitions. [2021-05-06 11:21:27,373 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 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) [2021-05-06 11:21:27,373 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 477 transitions. [2021-05-06 11:21:27,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:21:27,374 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:27,374 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 8, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:27,374 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-05-06 11:21:27,374 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:27,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:27,375 INFO L82 PathProgramCache]: Analyzing trace with hash -1117653812, now seen corresponding path program 5 times [2021-05-06 11:21:27,375 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:27,375 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1837707988] [2021-05-06 11:21:27,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:27,380 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:27,380 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:27,381 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:27,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:28,874 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 40 [2021-05-06 11:21:29,041 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:29,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:29,045 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:29,045 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:29,045 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1837707988] [2021-05-06 11:21:29,045 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1837707988] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:29,045 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:29,045 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:21:29,045 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449785596] [2021-05-06 11:21:29,045 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:21:29,045 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:29,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:21:29,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=364, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:21:29,046 INFO L87 Difference]: Start difference. First operand 377 states and 477 transitions. Second operand has 22 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 21 states have internal predecessors, (67), 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) [2021-05-06 11:21:29,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:29,631 INFO L93 Difference]: Finished difference Result 780 states and 991 transitions. [2021-05-06 11:21:29,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:21:29,632 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 21 states have internal predecessors, (67), 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 102 [2021-05-06 11:21:29,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:29,633 INFO L225 Difference]: With dead ends: 780 [2021-05-06 11:21:29,633 INFO L226 Difference]: Without dead ends: 729 [2021-05-06 11:21:29,634 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 5 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1263.0ms TimeCoverageRelationStatistics Valid=108, Invalid=398, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:21:29,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 729 states. [2021-05-06 11:21:29,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 729 to 504. [2021-05-06 11:21:29,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 504 states, 499 states have (on average 1.2605210420841684) internal successors, (629), 499 states have internal predecessors, (629), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:29,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 633 transitions. [2021-05-06 11:21:29,840 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 633 transitions. Word has length 102 [2021-05-06 11:21:29,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:29,840 INFO L480 AbstractCegarLoop]: Abstraction has 504 states and 633 transitions. [2021-05-06 11:21:29,840 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 21 states have internal predecessors, (67), 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) [2021-05-06 11:21:29,840 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 633 transitions. [2021-05-06 11:21:29,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:21:29,841 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:29,841 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 7, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:29,842 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-05-06 11:21:29,842 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:29,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:29,842 INFO L82 PathProgramCache]: Analyzing trace with hash -898799094, now seen corresponding path program 6 times [2021-05-06 11:21:29,842 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:29,842 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1029931715] [2021-05-06 11:21:29,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:29,847 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:29,847 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:29,848 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:29,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:31,439 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 40 [2021-05-06 11:21:31,595 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:31,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:31,607 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:31,607 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:31,607 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1029931715] [2021-05-06 11:21:31,607 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1029931715] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:31,607 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:31,607 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:21:31,607 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401190485] [2021-05-06 11:21:31,608 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:21:31,608 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:31,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:21:31,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=443, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:21:31,609 INFO L87 Difference]: Start difference. First operand 504 states and 633 transitions. Second operand has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 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) [2021-05-06 11:21:32,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:32,385 INFO L93 Difference]: Finished difference Result 1031 states and 1297 transitions. [2021-05-06 11:21:32,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 11:21:32,386 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 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 102 [2021-05-06 11:21:32,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:32,389 INFO L225 Difference]: With dead ends: 1031 [2021-05-06 11:21:32,389 INFO L226 Difference]: Without dead ends: 983 [2021-05-06 11:21:32,390 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 5 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 1329.2ms TimeCoverageRelationStatistics Valid=119, Invalid=481, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:21:32,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 983 states. [2021-05-06 11:21:32,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 983 to 755. [2021-05-06 11:21:32,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 755 states, 750 states have (on average 1.252) internal successors, (939), 750 states have internal predecessors, (939), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:32,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 755 states to 755 states and 943 transitions. [2021-05-06 11:21:32,736 INFO L78 Accepts]: Start accepts. Automaton has 755 states and 943 transitions. Word has length 102 [2021-05-06 11:21:32,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:32,736 INFO L480 AbstractCegarLoop]: Abstraction has 755 states and 943 transitions. [2021-05-06 11:21:32,736 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 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) [2021-05-06 11:21:32,736 INFO L276 IsEmpty]: Start isEmpty. Operand 755 states and 943 transitions. [2021-05-06 11:21:32,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:21:32,738 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:32,738 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 6, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:32,738 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-05-06 11:21:32,738 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:32,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:32,738 INFO L82 PathProgramCache]: Analyzing trace with hash 1707224460, now seen corresponding path program 7 times [2021-05-06 11:21:32,739 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:32,739 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [736709272] [2021-05-06 11:21:32,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:32,743 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:32,743 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:32,743 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:32,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:34,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:34,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:34,468 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:34,468 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:34,468 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [736709272] [2021-05-06 11:21:34,468 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [736709272] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:34,468 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:34,468 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:21:34,468 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386175176] [2021-05-06 11:21:34,469 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:21:34,469 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:34,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:21:34,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=530, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:21:34,469 INFO L87 Difference]: Start difference. First operand 755 states and 943 transitions. Second operand has 26 states, 26 states have (on average 2.923076923076923) internal successors, (76), 25 states have internal predecessors, (76), 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) [2021-05-06 11:21:35,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:35,650 INFO L93 Difference]: Finished difference Result 1518 states and 1891 transitions. [2021-05-06 11:21:35,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 11:21:35,650 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.923076923076923) internal successors, (76), 25 states have internal predecessors, (76), 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 102 [2021-05-06 11:21:35,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:35,654 INFO L225 Difference]: With dead ends: 1518 [2021-05-06 11:21:35,654 INFO L226 Difference]: Without dead ends: 1473 [2021-05-06 11:21:35,654 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 5 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 1347.8ms TimeCoverageRelationStatistics Valid=139, Invalid=617, Unknown=0, NotChecked=0, Total=756 [2021-05-06 11:21:35,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1473 states. [2021-05-06 11:21:36,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1473 to 1254. [2021-05-06 11:21:36,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1254 states, 1249 states have (on average 1.2465972778222578) internal successors, (1557), 1249 states have internal predecessors, (1557), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:36,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1254 states to 1254 states and 1561 transitions. [2021-05-06 11:21:36,218 INFO L78 Accepts]: Start accepts. Automaton has 1254 states and 1561 transitions. Word has length 102 [2021-05-06 11:21:36,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:36,218 INFO L480 AbstractCegarLoop]: Abstraction has 1254 states and 1561 transitions. [2021-05-06 11:21:36,218 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.923076923076923) internal successors, (76), 25 states have internal predecessors, (76), 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) [2021-05-06 11:21:36,218 INFO L276 IsEmpty]: Start isEmpty. Operand 1254 states and 1561 transitions. [2021-05-06 11:21:36,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:21:36,221 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:36,221 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 5, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:36,221 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-05-06 11:21:36,221 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:36,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:36,221 INFO L82 PathProgramCache]: Analyzing trace with hash 686156106, now seen corresponding path program 8 times [2021-05-06 11:21:36,221 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:36,222 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2088067757] [2021-05-06 11:21:36,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:36,226 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:36,226 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:36,227 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:36,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:36,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:36,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:36,905 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:36,905 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:36,905 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2088067757] [2021-05-06 11:21:36,905 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2088067757] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:36,905 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:36,905 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:21:36,905 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106862507] [2021-05-06 11:21:36,905 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:21:36,906 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:36,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:21:36,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=207, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:21:36,906 INFO L87 Difference]: Start difference. First operand 1254 states and 1561 transitions. Second operand has 16 states, 16 states have (on average 3.625) internal successors, (58), 15 states have internal predecessors, (58), 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) [2021-05-06 11:21:38,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:38,172 INFO L93 Difference]: Finished difference Result 1406 states and 1741 transitions. [2021-05-06 11:21:38,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 11:21:38,173 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.625) internal successors, (58), 15 states have internal predecessors, (58), 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 102 [2021-05-06 11:21:38,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:38,176 INFO L225 Difference]: With dead ends: 1406 [2021-05-06 11:21:38,176 INFO L226 Difference]: Without dead ends: 1364 [2021-05-06 11:21:38,176 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 714.2ms TimeCoverageRelationStatistics Valid=69, Invalid=483, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:21:38,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1364 states. [2021-05-06 11:21:38,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1364 to 1362. [2021-05-06 11:21:38,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1362 states, 1357 states have (on average 1.2380250552689758) internal successors, (1680), 1357 states have internal predecessors, (1680), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:38,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1362 states to 1362 states and 1684 transitions. [2021-05-06 11:21:38,827 INFO L78 Accepts]: Start accepts. Automaton has 1362 states and 1684 transitions. Word has length 102 [2021-05-06 11:21:38,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:38,828 INFO L480 AbstractCegarLoop]: Abstraction has 1362 states and 1684 transitions. [2021-05-06 11:21:38,828 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.625) internal successors, (58), 15 states have internal predecessors, (58), 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) [2021-05-06 11:21:38,828 INFO L276 IsEmpty]: Start isEmpty. Operand 1362 states and 1684 transitions. [2021-05-06 11:21:38,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:21:38,830 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:38,831 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 6, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:38,831 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-05-06 11:21:38,831 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:38,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:38,831 INFO L82 PathProgramCache]: Analyzing trace with hash 99350092, now seen corresponding path program 9 times [2021-05-06 11:21:38,831 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:38,832 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [463276950] [2021-05-06 11:21:38,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:38,839 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:38,839 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:38,840 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:38,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:39,116 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:39,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:39,120 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:39,121 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:39,121 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [463276950] [2021-05-06 11:21:39,121 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [463276950] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:39,121 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:39,121 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:21:39,121 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278194511] [2021-05-06 11:21:39,121 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:21:39,122 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:39,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:21:39,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:21:39,122 INFO L87 Difference]: Start difference. First operand 1362 states and 1684 transitions. Second operand has 15 states, 15 states have (on average 3.533333333333333) internal successors, (53), 13 states have internal predecessors, (53), 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) [2021-05-06 11:21:43,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:43,583 INFO L93 Difference]: Finished difference Result 8299 states and 10182 transitions. [2021-05-06 11:21:43,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 11:21:43,584 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.533333333333333) internal successors, (53), 13 states have internal predecessors, (53), 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 102 [2021-05-06 11:21:43,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:43,605 INFO L225 Difference]: With dead ends: 8299 [2021-05-06 11:21:43,606 INFO L226 Difference]: Without dead ends: 8291 [2021-05-06 11:21:43,608 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 383.2ms TimeCoverageRelationStatistics Valid=94, Invalid=836, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:21:43,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8291 states. [2021-05-06 11:21:46,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8291 to 5246. [2021-05-06 11:21:46,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5246 states, 5241 states have (on average 1.2407937416523565) internal successors, (6503), 5241 states have internal predecessors, (6503), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:46,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5246 states to 5246 states and 6507 transitions. [2021-05-06 11:21:46,358 INFO L78 Accepts]: Start accepts. Automaton has 5246 states and 6507 transitions. Word has length 102 [2021-05-06 11:21:46,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:46,358 INFO L480 AbstractCegarLoop]: Abstraction has 5246 states and 6507 transitions. [2021-05-06 11:21:46,358 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 3.533333333333333) internal successors, (53), 13 states have internal predecessors, (53), 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) [2021-05-06 11:21:46,359 INFO L276 IsEmpty]: Start isEmpty. Operand 5246 states and 6507 transitions. [2021-05-06 11:21:46,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:21:46,367 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:46,367 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 7, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:46,368 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2021-05-06 11:21:46,368 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:46,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:46,368 INFO L82 PathProgramCache]: Analyzing trace with hash -410122998, now seen corresponding path program 10 times [2021-05-06 11:21:46,368 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:46,368 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [929189173] [2021-05-06 11:21:46,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:46,373 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:46,373 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:46,374 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:46,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:47,552 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:47,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:47,557 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:47,557 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:47,557 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [929189173] [2021-05-06 11:21:47,557 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [929189173] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:47,557 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:47,557 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:21:47,557 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [731219444] [2021-05-06 11:21:47,557 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:21:47,557 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:47,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:21:47,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=230, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:21:47,558 INFO L87 Difference]: Start difference. First operand 5246 states and 6507 transitions. Second operand has 18 states, 18 states have (on average 3.0) internal successors, (54), 17 states have internal predecessors, (54), 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) [2021-05-06 11:21:50,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:50,617 INFO L93 Difference]: Finished difference Result 6272 states and 7788 transitions. [2021-05-06 11:21:50,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 11:21:50,617 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.0) internal successors, (54), 17 states have internal predecessors, (54), 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 102 [2021-05-06 11:21:50,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:50,627 INFO L225 Difference]: With dead ends: 6272 [2021-05-06 11:21:50,627 INFO L226 Difference]: Without dead ends: 5880 [2021-05-06 11:21:50,629 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 5 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 823.8ms TimeCoverageRelationStatistics Valid=86, Invalid=256, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:21:50,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5880 states. [2021-05-06 11:21:53,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5880 to 5144. [2021-05-06 11:21:53,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5144 states, 5139 states have (on average 1.2428488032691185) internal successors, (6387), 5139 states have internal predecessors, (6387), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:53,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5144 states to 5144 states and 6391 transitions. [2021-05-06 11:21:53,083 INFO L78 Accepts]: Start accepts. Automaton has 5144 states and 6391 transitions. Word has length 102 [2021-05-06 11:21:53,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:53,084 INFO L480 AbstractCegarLoop]: Abstraction has 5144 states and 6391 transitions. [2021-05-06 11:21:53,084 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 3.0) internal successors, (54), 17 states have internal predecessors, (54), 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) [2021-05-06 11:21:53,084 INFO L276 IsEmpty]: Start isEmpty. Operand 5144 states and 6391 transitions. [2021-05-06 11:21:53,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:21:53,092 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:53,092 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 7, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:53,092 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2021-05-06 11:21:53,093 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:53,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:53,093 INFO L82 PathProgramCache]: Analyzing trace with hash 800949966, now seen corresponding path program 11 times [2021-05-06 11:21:53,093 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:53,093 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [867800799] [2021-05-06 11:21:53,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:53,097 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:53,097 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:53,098 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:53,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:53,410 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 31 [2021-05-06 11:21:53,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:21:53,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:21:53,821 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:21:53,821 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:21:53,822 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [867800799] [2021-05-06 11:21:53,822 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [867800799] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:21:53,822 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:21:53,822 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 11:21:53,822 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660774070] [2021-05-06 11:21:53,822 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 11:21:53,822 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:21:53,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 11:21:53,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:21:53,823 INFO L87 Difference]: Start difference. First operand 5144 states and 6391 transitions. Second operand has 12 states, 12 states have (on average 3.5) internal successors, (42), 11 states have internal predecessors, (42), 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) [2021-05-06 11:21:57,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:21:57,048 INFO L93 Difference]: Finished difference Result 8770 states and 10843 transitions. [2021-05-06 11:21:57,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:21:57,049 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.5) internal successors, (42), 11 states have internal predecessors, (42), 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 102 [2021-05-06 11:21:57,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:21:57,057 INFO L225 Difference]: With dead ends: 8770 [2021-05-06 11:21:57,058 INFO L226 Difference]: Without dead ends: 5519 [2021-05-06 11:21:57,064 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 821.0ms TimeCoverageRelationStatistics Valid=64, Invalid=278, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:21:57,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5519 states. [2021-05-06 11:21:59,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5519 to 5465. [2021-05-06 11:21:59,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5465 states, 5460 states have (on average 1.2380952380952381) internal successors, (6760), 5460 states have internal predecessors, (6760), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:21:59,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5465 states to 5465 states and 6764 transitions. [2021-05-06 11:21:59,771 INFO L78 Accepts]: Start accepts. Automaton has 5465 states and 6764 transitions. Word has length 102 [2021-05-06 11:21:59,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:21:59,771 INFO L480 AbstractCegarLoop]: Abstraction has 5465 states and 6764 transitions. [2021-05-06 11:21:59,771 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.5) internal successors, (42), 11 states have internal predecessors, (42), 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) [2021-05-06 11:21:59,771 INFO L276 IsEmpty]: Start isEmpty. Operand 5465 states and 6764 transitions. [2021-05-06 11:21:59,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:21:59,780 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:21:59,780 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 8, 8, 7, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:21:59,780 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-05-06 11:21:59,781 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:21:59,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:21:59,781 INFO L82 PathProgramCache]: Analyzing trace with hash -1561164468, now seen corresponding path program 12 times [2021-05-06 11:21:59,781 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:21:59,781 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2085901919] [2021-05-06 11:21:59,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:21:59,786 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:21:59,786 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:21:59,787 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:21:59,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:01,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:01,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:01,782 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:22:01,782 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:22:01,782 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2085901919] [2021-05-06 11:22:01,782 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2085901919] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:22:01,782 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:22:01,783 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 11:22:01,783 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415379234] [2021-05-06 11:22:01,783 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 11:22:01,783 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:22:01,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 11:22:01,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=717, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:22:01,784 INFO L87 Difference]: Start difference. First operand 5465 states and 6764 transitions. Second operand has 29 states, 29 states have (on average 2.7241379310344827) internal successors, (79), 28 states have internal predecessors, (79), 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) [2021-05-06 11:22:06,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:06,196 INFO L93 Difference]: Finished difference Result 6564 states and 8146 transitions. [2021-05-06 11:22:06,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 11:22:06,197 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.7241379310344827) internal successors, (79), 28 states have internal predecessors, (79), 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 102 [2021-05-06 11:22:06,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:06,208 INFO L225 Difference]: With dead ends: 6564 [2021-05-06 11:22:06,208 INFO L226 Difference]: Without dead ends: 6329 [2021-05-06 11:22:06,210 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 13 SyntacticMatches, 6 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 632 ImplicationChecksByTransitivity, 2231.8ms TimeCoverageRelationStatistics Valid=356, Invalid=2506, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 11:22:06,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6329 states. [2021-05-06 11:22:09,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6329 to 5655. [2021-05-06 11:22:09,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5655 states, 5650 states have (on average 1.2412389380530973) internal successors, (7013), 5650 states have internal predecessors, (7013), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:09,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5655 states to 5655 states and 7017 transitions. [2021-05-06 11:22:09,141 INFO L78 Accepts]: Start accepts. Automaton has 5655 states and 7017 transitions. Word has length 102 [2021-05-06 11:22:09,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:22:09,141 INFO L480 AbstractCegarLoop]: Abstraction has 5655 states and 7017 transitions. [2021-05-06 11:22:09,141 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.7241379310344827) internal successors, (79), 28 states have internal predecessors, (79), 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) [2021-05-06 11:22:09,141 INFO L276 IsEmpty]: Start isEmpty. Operand 5655 states and 7017 transitions. [2021-05-06 11:22:09,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:22:09,149 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:22:09,149 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 8, 7, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:22:09,150 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2021-05-06 11:22:09,150 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:22:09,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:22:09,150 INFO L82 PathProgramCache]: Analyzing trace with hash -1954191478, now seen corresponding path program 13 times [2021-05-06 11:22:09,150 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:22:09,150 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [88525464] [2021-05-06 11:22:09,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:22:09,154 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:22:09,154 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:22:09,156 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:22:09,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:09,422 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 36 [2021-05-06 11:22:09,843 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:09,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:09,849 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:22:09,849 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:22:09,850 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [88525464] [2021-05-06 11:22:09,850 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [88525464] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:22:09,850 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:22:09,850 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:22:09,850 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2109393318] [2021-05-06 11:22:09,850 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:22:09,850 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:22:09,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:22:09,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=179, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:22:09,851 INFO L87 Difference]: Start difference. First operand 5655 states and 7017 transitions. Second operand has 15 states, 15 states have (on average 3.466666666666667) internal successors, (52), 14 states have internal predecessors, (52), 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) [2021-05-06 11:22:13,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:13,124 INFO L93 Difference]: Finished difference Result 9103 states and 11284 transitions. [2021-05-06 11:22:13,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:22:13,125 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.466666666666667) internal successors, (52), 14 states have internal predecessors, (52), 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 102 [2021-05-06 11:22:13,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:13,133 INFO L225 Difference]: With dead ends: 9103 [2021-05-06 11:22:13,134 INFO L226 Difference]: Without dead ends: 5265 [2021-05-06 11:22:13,141 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 821.7ms TimeCoverageRelationStatistics Valid=65, Invalid=397, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:22:13,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5265 states. [2021-05-06 11:22:15,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5265 to 5052. [2021-05-06 11:22:15,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5052 states, 5047 states have (on average 1.2389538339607689) internal successors, (6253), 5047 states have internal predecessors, (6253), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:15,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5052 states to 5052 states and 6257 transitions. [2021-05-06 11:22:15,732 INFO L78 Accepts]: Start accepts. Automaton has 5052 states and 6257 transitions. Word has length 102 [2021-05-06 11:22:15,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:22:15,732 INFO L480 AbstractCegarLoop]: Abstraction has 5052 states and 6257 transitions. [2021-05-06 11:22:15,732 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 3.466666666666667) internal successors, (52), 14 states have internal predecessors, (52), 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) [2021-05-06 11:22:15,732 INFO L276 IsEmpty]: Start isEmpty. Operand 5052 states and 6257 transitions. [2021-05-06 11:22:15,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:22:15,739 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:22:15,739 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 8, 6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:22:15,739 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2021-05-06 11:22:15,739 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:22:15,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:22:15,740 INFO L82 PathProgramCache]: Analyzing trace with hash -653960120, now seen corresponding path program 14 times [2021-05-06 11:22:15,740 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:22:15,740 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1674179877] [2021-05-06 11:22:15,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:22:15,744 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:22:15,744 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:22:15,745 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:22:15,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:17,520 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:17,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:17,527 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:22:17,528 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:22:17,528 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1674179877] [2021-05-06 11:22:17,528 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1674179877] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:22:17,528 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:22:17,528 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:22:17,528 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336990668] [2021-05-06 11:22:17,528 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:22:17,528 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:22:17,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:22:17,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=569, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:22:17,529 INFO L87 Difference]: Start difference. First operand 5052 states and 6257 transitions. Second operand has 26 states, 26 states have (on average 2.8461538461538463) internal successors, (74), 25 states have internal predecessors, (74), 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) [2021-05-06 11:22:21,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:21,710 INFO L93 Difference]: Finished difference Result 6210 states and 7674 transitions. [2021-05-06 11:22:21,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 11:22:21,710 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.8461538461538463) internal successors, (74), 25 states have internal predecessors, (74), 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 102 [2021-05-06 11:22:21,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:21,714 INFO L225 Difference]: With dead ends: 6210 [2021-05-06 11:22:21,714 INFO L226 Difference]: Without dead ends: 5975 [2021-05-06 11:22:21,716 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 13 SyntacticMatches, 6 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 446 ImplicationChecksByTransitivity, 1910.3ms TimeCoverageRelationStatistics Valid=292, Invalid=1870, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 11:22:21,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5975 states. [2021-05-06 11:22:24,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5975 to 5238. [2021-05-06 11:22:24,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5238 states, 5233 states have (on average 1.2367666730364992) internal successors, (6472), 5233 states have internal predecessors, (6472), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:24,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5238 states to 5238 states and 6476 transitions. [2021-05-06 11:22:24,343 INFO L78 Accepts]: Start accepts. Automaton has 5238 states and 6476 transitions. Word has length 102 [2021-05-06 11:22:24,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:22:24,343 INFO L480 AbstractCegarLoop]: Abstraction has 5238 states and 6476 transitions. [2021-05-06 11:22:24,344 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.8461538461538463) internal successors, (74), 25 states have internal predecessors, (74), 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) [2021-05-06 11:22:24,344 INFO L276 IsEmpty]: Start isEmpty. Operand 5238 states and 6476 transitions. [2021-05-06 11:22:24,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:22:24,350 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:22:24,350 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 7, 6, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:22:24,351 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2021-05-06 11:22:24,351 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:22:24,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:22:24,351 INFO L82 PathProgramCache]: Analyzing trace with hash -1046987130, now seen corresponding path program 15 times [2021-05-06 11:22:24,351 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:22:24,351 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [719757576] [2021-05-06 11:22:24,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:22:24,355 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:22:24,355 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:22:24,356 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:22:24,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:24,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:24,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:24,845 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:22:24,845 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:22:24,845 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [719757576] [2021-05-06 11:22:24,845 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [719757576] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:22:24,845 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:22:24,845 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:22:24,845 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47098526] [2021-05-06 11:22:24,845 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:22:24,845 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:22:24,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:22:24,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:22:24,846 INFO L87 Difference]: Start difference. First operand 5238 states and 6476 transitions. Second operand has 13 states, 13 states have (on average 3.769230769230769) internal successors, (49), 12 states have internal predecessors, (49), 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) [2021-05-06 11:22:27,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:27,590 INFO L93 Difference]: Finished difference Result 8281 states and 10193 transitions. [2021-05-06 11:22:27,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:22:27,590 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.769230769230769) internal successors, (49), 12 states have internal predecessors, (49), 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 102 [2021-05-06 11:22:27,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:27,594 INFO L225 Difference]: With dead ends: 8281 [2021-05-06 11:22:27,594 INFO L226 Difference]: Without dead ends: 4648 [2021-05-06 11:22:27,599 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 480.9ms TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:22:27,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4648 states. [2021-05-06 11:22:29,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4648 to 4648. [2021-05-06 11:22:29,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4648 states, 4643 states have (on average 1.2220547060090459) internal successors, (5674), 4643 states have internal predecessors, (5674), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:30,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4648 states to 4648 states and 5678 transitions. [2021-05-06 11:22:30,000 INFO L78 Accepts]: Start accepts. Automaton has 4648 states and 5678 transitions. Word has length 102 [2021-05-06 11:22:30,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:22:30,000 INFO L480 AbstractCegarLoop]: Abstraction has 4648 states and 5678 transitions. [2021-05-06 11:22:30,000 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.769230769230769) internal successors, (49), 12 states have internal predecessors, (49), 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) [2021-05-06 11:22:30,000 INFO L276 IsEmpty]: Start isEmpty. Operand 4648 states and 5678 transitions. [2021-05-06 11:22:30,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:22:30,008 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:22:30,008 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 6, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:22:30,008 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2021-05-06 11:22:30,008 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:22:30,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:22:30,008 INFO L82 PathProgramCache]: Analyzing trace with hash 710207618, now seen corresponding path program 16 times [2021-05-06 11:22:30,008 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:22:30,009 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1663771242] [2021-05-06 11:22:30,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:22:30,013 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:22:30,013 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:22:30,014 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:22:30,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:30,544 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:30,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:30,546 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:22:30,546 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:22:30,546 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1663771242] [2021-05-06 11:22:30,546 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1663771242] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:22:30,546 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:22:30,546 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:22:30,546 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1799466883] [2021-05-06 11:22:30,547 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:22:30,547 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:22:30,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:22:30,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=152, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:22:30,547 INFO L87 Difference]: Start difference. First operand 4648 states and 5678 transitions. Second operand has 14 states, 14 states have (on average 3.642857142857143) internal successors, (51), 13 states have internal predecessors, (51), 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) [2021-05-06 11:22:33,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:33,188 INFO L93 Difference]: Finished difference Result 7474 states and 9095 transitions. [2021-05-06 11:22:33,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 11:22:33,188 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.642857142857143) internal successors, (51), 13 states have internal predecessors, (51), 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 102 [2021-05-06 11:22:33,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:33,193 INFO L225 Difference]: With dead ends: 7474 [2021-05-06 11:22:33,193 INFO L226 Difference]: Without dead ends: 4331 [2021-05-06 11:22:33,197 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 527.7ms TimeCoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:22:33,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4331 states. [2021-05-06 11:22:35,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4331 to 4061. [2021-05-06 11:22:35,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4061 states, 4056 states have (on average 1.2233727810650887) internal successors, (4962), 4056 states have internal predecessors, (4962), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:35,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4061 states to 4061 states and 4966 transitions. [2021-05-06 11:22:35,314 INFO L78 Accepts]: Start accepts. Automaton has 4061 states and 4966 transitions. Word has length 102 [2021-05-06 11:22:35,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:22:35,314 INFO L480 AbstractCegarLoop]: Abstraction has 4061 states and 4966 transitions. [2021-05-06 11:22:35,314 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.642857142857143) internal successors, (51), 13 states have internal predecessors, (51), 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) [2021-05-06 11:22:35,314 INFO L276 IsEmpty]: Start isEmpty. Operand 4061 states and 4966 transitions. [2021-05-06 11:22:35,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:22:35,318 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:22:35,318 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 5, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:22:35,318 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2021-05-06 11:22:35,318 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:22:35,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:22:35,319 INFO L82 PathProgramCache]: Analyzing trace with hash -994254842, now seen corresponding path program 17 times [2021-05-06 11:22:35,319 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:22:35,319 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1663023986] [2021-05-06 11:22:35,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:22:35,324 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:22:35,324 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:22:35,325 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:22:35,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:36,513 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:36,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:36,516 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:22:36,516 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:22:36,516 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1663023986] [2021-05-06 11:22:36,516 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1663023986] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:22:36,516 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:22:36,516 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:22:36,516 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818246102] [2021-05-06 11:22:36,517 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:22:36,517 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:22:36,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:22:36,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=230, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:22:36,517 INFO L87 Difference]: Start difference. First operand 4061 states and 4966 transitions. Second operand has 18 states, 18 states have (on average 3.111111111111111) internal successors, (56), 17 states have internal predecessors, (56), 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) [2021-05-06 11:22:38,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:38,965 INFO L93 Difference]: Finished difference Result 4930 states and 6033 transitions. [2021-05-06 11:22:38,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 11:22:38,966 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.111111111111111) internal successors, (56), 17 states have internal predecessors, (56), 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 102 [2021-05-06 11:22:38,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:38,970 INFO L225 Difference]: With dead ends: 4930 [2021-05-06 11:22:38,970 INFO L226 Difference]: Without dead ends: 4272 [2021-05-06 11:22:38,972 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 5 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 820.4ms TimeCoverageRelationStatistics Valid=86, Invalid=256, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:22:38,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4272 states. [2021-05-06 11:22:40,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4272 to 3716. [2021-05-06 11:22:40,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3716 states, 3711 states have (on average 1.21880894637564) internal successors, (4523), 3711 states have internal predecessors, (4523), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:40,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3716 states to 3716 states and 4527 transitions. [2021-05-06 11:22:40,875 INFO L78 Accepts]: Start accepts. Automaton has 3716 states and 4527 transitions. Word has length 102 [2021-05-06 11:22:40,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:22:40,875 INFO L480 AbstractCegarLoop]: Abstraction has 3716 states and 4527 transitions. [2021-05-06 11:22:40,875 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 3.111111111111111) internal successors, (56), 17 states have internal predecessors, (56), 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) [2021-05-06 11:22:40,875 INFO L276 IsEmpty]: Start isEmpty. Operand 3716 states and 4527 transitions. [2021-05-06 11:22:40,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:22:40,879 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:22:40,879 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 5, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:22:40,879 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2021-05-06 11:22:40,879 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:22:40,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:22:40,879 INFO L82 PathProgramCache]: Analyzing trace with hash -916921918, now seen corresponding path program 18 times [2021-05-06 11:22:40,879 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:22:40,879 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1984467147] [2021-05-06 11:22:40,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:22:40,883 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:22:40,883 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:22:40,884 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:22:40,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:41,481 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 123 DAG size of output: 38 [2021-05-06 11:22:42,566 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:42,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:42,569 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:22:42,569 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:22:42,569 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1984467147] [2021-05-06 11:22:42,569 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1984467147] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:22:42,569 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:22:42,569 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 11:22:42,569 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743713932] [2021-05-06 11:22:42,569 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 11:22:42,569 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:22:42,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 11:22:42,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:22:42,570 INFO L87 Difference]: Start difference. First operand 3716 states and 4527 transitions. Second operand has 25 states, 25 states have (on average 2.88) internal successors, (72), 24 states have internal predecessors, (72), 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) [2021-05-06 11:22:46,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:46,268 INFO L93 Difference]: Finished difference Result 4586 states and 5617 transitions. [2021-05-06 11:22:46,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 11:22:46,269 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.88) internal successors, (72), 24 states have internal predecessors, (72), 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 102 [2021-05-06 11:22:46,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:46,273 INFO L225 Difference]: With dead ends: 4586 [2021-05-06 11:22:46,273 INFO L226 Difference]: Without dead ends: 4336 [2021-05-06 11:22:46,274 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 13 SyntacticMatches, 6 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 406 ImplicationChecksByTransitivity, 1794.8ms TimeCoverageRelationStatistics Valid=277, Invalid=1703, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 11:22:46,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4336 states. [2021-05-06 11:22:48,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4336 to 3674. [2021-05-06 11:22:48,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3674 states, 3669 states have (on average 1.2213137094576179) internal successors, (4481), 3669 states have internal predecessors, (4481), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:48,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3674 states to 3674 states and 4485 transitions. [2021-05-06 11:22:48,938 INFO L78 Accepts]: Start accepts. Automaton has 3674 states and 4485 transitions. Word has length 102 [2021-05-06 11:22:48,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:22:48,938 INFO L480 AbstractCegarLoop]: Abstraction has 3674 states and 4485 transitions. [2021-05-06 11:22:48,939 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.88) internal successors, (72), 24 states have internal predecessors, (72), 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) [2021-05-06 11:22:48,939 INFO L276 IsEmpty]: Start isEmpty. Operand 3674 states and 4485 transitions. [2021-05-06 11:22:48,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:22:48,942 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:22:48,942 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 7, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:22:48,942 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2021-05-06 11:22:48,942 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:22:48,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:22:48,942 INFO L82 PathProgramCache]: Analyzing trace with hash -1363179322, now seen corresponding path program 19 times [2021-05-06 11:22:48,942 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:22:48,942 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1351360895] [2021-05-06 11:22:48,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:22:48,946 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:22:48,947 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:22:48,947 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:22:49,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:50,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:50,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:50,333 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:22:50,334 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:22:50,334 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1351360895] [2021-05-06 11:22:50,334 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1351360895] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:22:50,334 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:22:50,334 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 11:22:50,334 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281768294] [2021-05-06 11:22:50,334 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 11:22:50,334 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:22:50,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 11:22:50,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:22:50,335 INFO L87 Difference]: Start difference. First operand 3674 states and 4485 transitions. Second operand has 20 states, 20 states have (on average 3.0) internal successors, (60), 19 states have internal predecessors, (60), 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) [2021-05-06 11:22:52,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:52,856 INFO L93 Difference]: Finished difference Result 4642 states and 5665 transitions. [2021-05-06 11:22:52,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 11:22:52,856 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.0) internal successors, (60), 19 states have internal predecessors, (60), 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 102 [2021-05-06 11:22:52,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:52,860 INFO L225 Difference]: With dead ends: 4642 [2021-05-06 11:22:52,860 INFO L226 Difference]: Without dead ends: 4268 [2021-05-06 11:22:52,861 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 1008.5ms TimeCoverageRelationStatistics Valid=97, Invalid=323, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:22:52,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4268 states. [2021-05-06 11:22:54,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4268 to 3650. [2021-05-06 11:22:54,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3650 states, 3645 states have (on average 1.2205761316872428) internal successors, (4449), 3645 states have internal predecessors, (4449), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:22:54,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3650 states to 3650 states and 4453 transitions. [2021-05-06 11:22:54,771 INFO L78 Accepts]: Start accepts. Automaton has 3650 states and 4453 transitions. Word has length 102 [2021-05-06 11:22:54,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:22:54,771 INFO L480 AbstractCegarLoop]: Abstraction has 3650 states and 4453 transitions. [2021-05-06 11:22:54,771 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 3.0) internal successors, (60), 19 states have internal predecessors, (60), 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) [2021-05-06 11:22:54,771 INFO L276 IsEmpty]: Start isEmpty. Operand 3650 states and 4453 transitions. [2021-05-06 11:22:54,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:22:54,774 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:22:54,774 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 7, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:22:54,774 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2021-05-06 11:22:54,775 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:22:54,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:22:54,775 INFO L82 PathProgramCache]: Analyzing trace with hash -802128058, now seen corresponding path program 20 times [2021-05-06 11:22:54,775 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:22:54,775 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [992772629] [2021-05-06 11:22:54,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:22:54,778 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:22:54,779 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:22:54,779 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:22:54,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:55,079 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 31 [2021-05-06 11:22:55,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:22:55,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:22:55,569 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:22:55,570 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:22:55,570 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [992772629] [2021-05-06 11:22:55,570 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [992772629] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:22:55,570 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:22:55,570 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:22:55,570 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [431841567] [2021-05-06 11:22:55,570 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:22:55,570 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:22:55,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:22:55,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:22:55,571 INFO L87 Difference]: Start difference. First operand 3650 states and 4453 transitions. Second operand has 13 states, 13 states have (on average 3.4615384615384617) internal successors, (45), 12 states have internal predecessors, (45), 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) [2021-05-06 11:22:58,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:22:58,090 INFO L93 Difference]: Finished difference Result 6216 states and 7555 transitions. [2021-05-06 11:22:58,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 11:22:58,090 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.4615384615384617) internal successors, (45), 12 states have internal predecessors, (45), 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 102 [2021-05-06 11:22:58,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:22:58,093 INFO L225 Difference]: With dead ends: 6216 [2021-05-06 11:22:58,093 INFO L226 Difference]: Without dead ends: 3802 [2021-05-06 11:22:58,095 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 930.5ms TimeCoverageRelationStatistics Valid=71, Invalid=349, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:22:58,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3802 states. [2021-05-06 11:23:00,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3802 to 3764. [2021-05-06 11:23:00,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3764 states, 3759 states have (on average 1.2136206437882415) internal successors, (4562), 3759 states have internal predecessors, (4562), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:00,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3764 states to 3764 states and 4566 transitions. [2021-05-06 11:23:00,033 INFO L78 Accepts]: Start accepts. Automaton has 3764 states and 4566 transitions. Word has length 102 [2021-05-06 11:23:00,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:23:00,034 INFO L480 AbstractCegarLoop]: Abstraction has 3764 states and 4566 transitions. [2021-05-06 11:23:00,034 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.4615384615384617) internal successors, (45), 12 states have internal predecessors, (45), 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) [2021-05-06 11:23:00,034 INFO L276 IsEmpty]: Start isEmpty. Operand 3764 states and 4566 transitions. [2021-05-06 11:23:00,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:23:00,038 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:23:00,038 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 7, 6, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:23:00,038 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2021-05-06 11:23:00,038 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:23:00,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:23:00,038 INFO L82 PathProgramCache]: Analyzing trace with hash -349524534, now seen corresponding path program 21 times [2021-05-06 11:23:00,039 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:23:00,039 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [924994664] [2021-05-06 11:23:00,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:23:00,044 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:23:00,044 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:23:00,045 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:23:00,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:00,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:23:00,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:00,684 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:23:00,684 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:23:00,684 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [924994664] [2021-05-06 11:23:00,684 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [924994664] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:23:00,684 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:23:00,684 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:23:00,684 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115204944] [2021-05-06 11:23:00,684 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:23:00,684 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:23:00,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:23:00,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=205, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:23:00,685 INFO L87 Difference]: Start difference. First operand 3764 states and 4566 transitions. Second operand has 16 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 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) [2021-05-06 11:23:03,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:23:03,184 INFO L93 Difference]: Finished difference Result 6098 states and 7402 transitions. [2021-05-06 11:23:03,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:23:03,185 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 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 102 [2021-05-06 11:23:03,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:23:03,188 INFO L225 Difference]: With dead ends: 6098 [2021-05-06 11:23:03,188 INFO L226 Difference]: Without dead ends: 3486 [2021-05-06 11:23:03,191 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 813.8ms TimeCoverageRelationStatistics Valid=96, Invalid=606, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:23:03,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3486 states. [2021-05-06 11:23:04,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3486 to 3342. [2021-05-06 11:23:04,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3342 states, 3337 states have (on average 1.2154629907102188) internal successors, (4056), 3337 states have internal predecessors, (4056), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:04,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3342 states to 3342 states and 4060 transitions. [2021-05-06 11:23:04,987 INFO L78 Accepts]: Start accepts. Automaton has 3342 states and 4060 transitions. Word has length 102 [2021-05-06 11:23:04,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:23:04,987 INFO L480 AbstractCegarLoop]: Abstraction has 3342 states and 4060 transitions. [2021-05-06 11:23:04,987 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 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) [2021-05-06 11:23:04,987 INFO L276 IsEmpty]: Start isEmpty. Operand 3342 states and 4060 transitions. [2021-05-06 11:23:04,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:23:04,990 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:23:04,990 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 7, 5, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:23:04,990 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2021-05-06 11:23:04,990 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:23:04,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:23:04,990 INFO L82 PathProgramCache]: Analyzing trace with hash 950706824, now seen corresponding path program 22 times [2021-05-06 11:23:04,990 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:23:04,990 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1187576112] [2021-05-06 11:23:04,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:23:04,994 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:23:04,994 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:23:04,995 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:23:05,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:05,667 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 123 DAG size of output: 37 [2021-05-06 11:23:06,856 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:23:06,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:06,858 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:23:06,859 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:23:06,859 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1187576112] [2021-05-06 11:23:06,859 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1187576112] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:23:06,859 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:23:06,859 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 11:23:06,859 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214972692] [2021-05-06 11:23:06,859 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 11:23:06,859 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:23:06,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 11:23:06,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=617, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:23:06,860 INFO L87 Difference]: Start difference. First operand 3342 states and 4060 transitions. Second operand has 27 states, 27 states have (on average 2.8518518518518516) internal successors, (77), 26 states have internal predecessors, (77), 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) [2021-05-06 11:23:10,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:23:10,336 INFO L93 Difference]: Finished difference Result 4242 states and 5192 transitions. [2021-05-06 11:23:10,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 11:23:10,336 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.8518518518518516) internal successors, (77), 26 states have internal predecessors, (77), 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 102 [2021-05-06 11:23:10,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:23:10,339 INFO L225 Difference]: With dead ends: 4242 [2021-05-06 11:23:10,339 INFO L226 Difference]: Without dead ends: 4007 [2021-05-06 11:23:10,340 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 13 SyntacticMatches, 6 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 2057.0ms TimeCoverageRelationStatistics Valid=305, Invalid=2047, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 11:23:10,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4007 states. [2021-05-06 11:23:12,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4007 to 3396. [2021-05-06 11:23:12,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3396 states, 3391 states have (on average 1.2138012385726924) internal successors, (4116), 3391 states have internal predecessors, (4116), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:12,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3396 states to 3396 states and 4120 transitions. [2021-05-06 11:23:12,142 INFO L78 Accepts]: Start accepts. Automaton has 3396 states and 4120 transitions. Word has length 102 [2021-05-06 11:23:12,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:23:12,142 INFO L480 AbstractCegarLoop]: Abstraction has 3396 states and 4120 transitions. [2021-05-06 11:23:12,142 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.8518518518518516) internal successors, (77), 26 states have internal predecessors, (77), 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) [2021-05-06 11:23:12,143 INFO L276 IsEmpty]: Start isEmpty. Operand 3396 states and 4120 transitions. [2021-05-06 11:23:12,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:23:12,146 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:23:12,146 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 6, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:23:12,146 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2021-05-06 11:23:12,146 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:23:12,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:23:12,147 INFO L82 PathProgramCache]: Analyzing trace with hash 557679814, now seen corresponding path program 23 times [2021-05-06 11:23:12,147 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:23:12,147 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [976222777] [2021-05-06 11:23:12,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:23:12,151 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:23:12,151 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:23:12,152 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:23:12,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:12,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:23:12,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:12,805 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:23:12,805 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:23:12,805 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [976222777] [2021-05-06 11:23:12,805 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [976222777] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:23:12,805 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:23:12,805 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:23:12,805 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600896588] [2021-05-06 11:23:12,805 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:23:12,805 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:23:12,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:23:12,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=177, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:23:12,806 INFO L87 Difference]: Start difference. First operand 3396 states and 4120 transitions. Second operand has 15 states, 15 states have (on average 3.4) internal successors, (51), 14 states have internal predecessors, (51), 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) [2021-05-06 11:23:15,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:23:15,123 INFO L93 Difference]: Finished difference Result 5484 states and 6628 transitions. [2021-05-06 11:23:15,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 11:23:15,123 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.4) internal successors, (51), 14 states have internal predecessors, (51), 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 102 [2021-05-06 11:23:15,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:23:15,128 INFO L225 Difference]: With dead ends: 5484 [2021-05-06 11:23:15,128 INFO L226 Difference]: Without dead ends: 3116 [2021-05-06 11:23:15,134 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 760.9ms TimeCoverageRelationStatistics Valid=89, Invalid=511, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:23:15,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3116 states. [2021-05-06 11:23:16,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3116 to 2995. [2021-05-06 11:23:16,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2995 states, 2990 states have (on average 1.208695652173913) internal successors, (3614), 2990 states have internal predecessors, (3614), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:16,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2995 states to 2995 states and 3618 transitions. [2021-05-06 11:23:16,771 INFO L78 Accepts]: Start accepts. Automaton has 2995 states and 3618 transitions. Word has length 102 [2021-05-06 11:23:16,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:23:16,771 INFO L480 AbstractCegarLoop]: Abstraction has 2995 states and 3618 transitions. [2021-05-06 11:23:16,772 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 3.4) internal successors, (51), 14 states have internal predecessors, (51), 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) [2021-05-06 11:23:16,772 INFO L276 IsEmpty]: Start isEmpty. Operand 2995 states and 3618 transitions. [2021-05-06 11:23:16,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:23:16,774 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:23:16,774 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 5, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:23:16,774 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2021-05-06 11:23:16,774 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:23:16,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:23:16,774 INFO L82 PathProgramCache]: Analyzing trace with hash -1146782646, now seen corresponding path program 24 times [2021-05-06 11:23:16,774 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:23:16,774 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [375961346] [2021-05-06 11:23:16,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:23:16,777 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:23:16,777 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:23:16,778 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:23:16,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:18,373 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 40 [2021-05-06 11:23:18,554 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:23:18,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:18,557 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:23:18,557 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:23:18,557 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [375961346] [2021-05-06 11:23:18,557 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [375961346] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:23:18,557 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:23:18,557 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:23:18,557 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214712328] [2021-05-06 11:23:18,557 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:23:18,557 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:23:18,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:23:18,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=569, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:23:18,558 INFO L87 Difference]: Start difference. First operand 2995 states and 3618 transitions. Second operand has 26 states, 26 states have (on average 2.8846153846153846) internal successors, (75), 25 states have internal predecessors, (75), 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) [2021-05-06 11:23:21,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:23:21,755 INFO L93 Difference]: Finished difference Result 3838 states and 4681 transitions. [2021-05-06 11:23:21,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 11:23:21,755 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.8846153846153846) internal successors, (75), 25 states have internal predecessors, (75), 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 102 [2021-05-06 11:23:21,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:23:21,758 INFO L225 Difference]: With dead ends: 3838 [2021-05-06 11:23:21,758 INFO L226 Difference]: Without dead ends: 3588 [2021-05-06 11:23:21,759 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 13 SyntacticMatches, 6 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 451 ImplicationChecksByTransitivity, 1916.1ms TimeCoverageRelationStatistics Valid=290, Invalid=1872, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 11:23:21,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3588 states. [2021-05-06 11:23:23,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3588 to 2968. [2021-05-06 11:23:23,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2968 states, 2963 states have (on average 1.2105973675329058) internal successors, (3587), 2963 states have internal predecessors, (3587), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:23,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2968 states to 2968 states and 3591 transitions. [2021-05-06 11:23:23,359 INFO L78 Accepts]: Start accepts. Automaton has 2968 states and 3591 transitions. Word has length 102 [2021-05-06 11:23:23,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:23:23,359 INFO L480 AbstractCegarLoop]: Abstraction has 2968 states and 3591 transitions. [2021-05-06 11:23:23,359 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.8846153846153846) internal successors, (75), 25 states have internal predecessors, (75), 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) [2021-05-06 11:23:23,359 INFO L276 IsEmpty]: Start isEmpty. Operand 2968 states and 3591 transitions. [2021-05-06 11:23:23,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:23:23,361 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:23:23,361 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 7, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:23:23,361 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2021-05-06 11:23:23,361 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:23:23,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:23:23,361 INFO L82 PathProgramCache]: Analyzing trace with hash -1514733942, now seen corresponding path program 25 times [2021-05-06 11:23:23,362 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:23:23,362 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [963828394] [2021-05-06 11:23:23,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:23:23,365 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:23:23,366 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:23:23,366 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:23:23,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:24,708 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:23:24,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:24,710 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:23:24,710 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:23:24,710 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [963828394] [2021-05-06 11:23:24,710 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [963828394] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:23:24,711 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:23:24,711 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:23:24,711 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965191794] [2021-05-06 11:23:24,711 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:23:24,711 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:23:24,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:23:24,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=364, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:23:24,711 INFO L87 Difference]: Start difference. First operand 2968 states and 3591 transitions. Second operand has 22 states, 22 states have (on average 3.0) internal successors, (66), 21 states have internal predecessors, (66), 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) [2021-05-06 11:23:27,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:23:27,053 INFO L93 Difference]: Finished difference Result 3879 states and 4714 transitions. [2021-05-06 11:23:27,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:23:27,054 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.0) internal successors, (66), 21 states have internal predecessors, (66), 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 102 [2021-05-06 11:23:27,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:23:27,057 INFO L225 Difference]: With dead ends: 3879 [2021-05-06 11:23:27,057 INFO L226 Difference]: Without dead ends: 3523 [2021-05-06 11:23:27,057 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 5 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1005.8ms TimeCoverageRelationStatistics Valid=108, Invalid=398, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:23:27,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3523 states. [2021-05-06 11:23:28,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3523 to 2944. [2021-05-06 11:23:28,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2944 states, 2939 states have (on average 1.2095951003742769) internal successors, (3555), 2939 states have internal predecessors, (3555), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:28,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2944 states to 2944 states and 3559 transitions. [2021-05-06 11:23:28,684 INFO L78 Accepts]: Start accepts. Automaton has 2944 states and 3559 transitions. Word has length 102 [2021-05-06 11:23:28,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:23:28,684 INFO L480 AbstractCegarLoop]: Abstraction has 2944 states and 3559 transitions. [2021-05-06 11:23:28,684 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 3.0) internal successors, (66), 21 states have internal predecessors, (66), 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) [2021-05-06 11:23:28,684 INFO L276 IsEmpty]: Start isEmpty. Operand 2944 states and 3559 transitions. [2021-05-06 11:23:28,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:23:28,687 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:23:28,687 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 7, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:23:28,688 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2021-05-06 11:23:28,688 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:23:28,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:23:28,688 INFO L82 PathProgramCache]: Analyzing trace with hash -1031988786, now seen corresponding path program 26 times [2021-05-06 11:23:28,688 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:23:28,688 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1135163314] [2021-05-06 11:23:28,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:23:28,692 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:23:28,692 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:23:28,693 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:23:28,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:28,986 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 31 [2021-05-06 11:23:29,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:23:29,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:29,465 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:23:29,465 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:23:29,465 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1135163314] [2021-05-06 11:23:29,465 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1135163314] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:23:29,465 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:23:29,466 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:23:29,466 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35090993] [2021-05-06 11:23:29,466 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:23:29,466 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:23:29,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:23:29,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:23:29,466 INFO L87 Difference]: Start difference. First operand 2944 states and 3559 transitions. Second operand has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 13 states have internal predecessors, (48), 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) [2021-05-06 11:23:31,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:23:31,723 INFO L93 Difference]: Finished difference Result 5114 states and 6171 transitions. [2021-05-06 11:23:31,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:23:31,723 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 13 states have internal predecessors, (48), 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 102 [2021-05-06 11:23:31,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:23:31,726 INFO L225 Difference]: With dead ends: 5114 [2021-05-06 11:23:31,726 INFO L226 Difference]: Without dead ends: 3064 [2021-05-06 11:23:31,728 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 922.6ms TimeCoverageRelationStatistics Valid=78, Invalid=428, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:23:31,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3064 states. [2021-05-06 11:23:33,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3064 to 3034. [2021-05-06 11:23:33,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3034 states, 3029 states have (on average 1.203037306041598) internal successors, (3644), 3029 states have internal predecessors, (3644), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:33,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3034 states to 3034 states and 3648 transitions. [2021-05-06 11:23:33,375 INFO L78 Accepts]: Start accepts. Automaton has 3034 states and 3648 transitions. Word has length 102 [2021-05-06 11:23:33,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:23:33,375 INFO L480 AbstractCegarLoop]: Abstraction has 3034 states and 3648 transitions. [2021-05-06 11:23:33,375 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 13 states have internal predecessors, (48), 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) [2021-05-06 11:23:33,375 INFO L276 IsEmpty]: Start isEmpty. Operand 3034 states and 3648 transitions. [2021-05-06 11:23:33,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:23:33,377 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:23:33,377 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 6, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:23:33,377 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2021-05-06 11:23:33,377 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:23:33,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:23:33,377 INFO L82 PathProgramCache]: Analyzing trace with hash 1407670214, now seen corresponding path program 27 times [2021-05-06 11:23:33,377 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:23:33,378 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [998018299] [2021-05-06 11:23:33,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:23:33,381 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:23:33,381 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:23:33,382 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:23:33,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:33,981 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:23:33,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:33,989 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:23:33,989 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:23:33,989 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [998018299] [2021-05-06 11:23:33,990 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [998018299] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:23:33,990 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:23:33,990 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:23:33,990 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143928129] [2021-05-06 11:23:33,990 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:23:33,990 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:23:33,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:23:33,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:23:33,991 INFO L87 Difference]: Start difference. First operand 3034 states and 3648 transitions. Second operand has 16 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 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) [2021-05-06 11:23:36,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:23:36,304 INFO L93 Difference]: Finished difference Result 4960 states and 5966 transitions. [2021-05-06 11:23:36,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:23:36,304 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 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 102 [2021-05-06 11:23:36,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:23:36,307 INFO L225 Difference]: With dead ends: 4960 [2021-05-06 11:23:36,307 INFO L226 Difference]: Without dead ends: 2830 [2021-05-06 11:23:36,309 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 784.9ms TimeCoverageRelationStatistics Valid=97, Invalid=605, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:23:36,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2830 states. [2021-05-06 11:23:37,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2830 to 2720. [2021-05-06 11:23:37,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2720 states, 2715 states have (on average 1.2029465930018417) internal successors, (3266), 2715 states have internal predecessors, (3266), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:37,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2720 states to 2720 states and 3270 transitions. [2021-05-06 11:23:37,838 INFO L78 Accepts]: Start accepts. Automaton has 2720 states and 3270 transitions. Word has length 102 [2021-05-06 11:23:37,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:23:37,838 INFO L480 AbstractCegarLoop]: Abstraction has 2720 states and 3270 transitions. [2021-05-06 11:23:37,838 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 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) [2021-05-06 11:23:37,838 INFO L276 IsEmpty]: Start isEmpty. Operand 2720 states and 3270 transitions. [2021-05-06 11:23:37,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:23:37,840 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:23:37,840 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 6, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:23:37,840 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2021-05-06 11:23:37,840 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:23:37,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:23:37,840 INFO L82 PathProgramCache]: Analyzing trace with hash -1587065724, now seen corresponding path program 28 times [2021-05-06 11:23:37,840 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:23:37,840 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [780199986] [2021-05-06 11:23:37,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:23:37,844 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:23:37,844 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:23:37,845 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:23:37,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:39,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:23:39,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:39,886 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:23:39,886 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:23:39,886 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [780199986] [2021-05-06 11:23:39,886 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [780199986] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:23:39,886 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:23:39,887 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 11:23:39,887 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926144862] [2021-05-06 11:23:39,887 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 11:23:39,887 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:23:39,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 11:23:39,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=773, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:23:39,887 INFO L87 Difference]: Start difference. First operand 2720 states and 3270 transitions. Second operand has 30 states, 30 states have (on average 2.6666666666666665) internal successors, (80), 29 states have internal predecessors, (80), 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) [2021-05-06 11:23:46,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:23:46,295 INFO L93 Difference]: Finished difference Result 6757 states and 8200 transitions. [2021-05-06 11:23:46,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-06 11:23:46,295 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.6666666666666665) internal successors, (80), 29 states have internal predecessors, (80), 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 102 [2021-05-06 11:23:46,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:23:46,301 INFO L225 Difference]: With dead ends: 6757 [2021-05-06 11:23:46,301 INFO L226 Difference]: Without dead ends: 6522 [2021-05-06 11:23:46,302 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 14 SyntacticMatches, 6 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1588 ImplicationChecksByTransitivity, 3403.4ms TimeCoverageRelationStatistics Valid=726, Invalid=5594, Unknown=0, NotChecked=0, Total=6320 [2021-05-06 11:23:46,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6522 states. [2021-05-06 11:23:47,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6522 to 2738. [2021-05-06 11:23:47,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2738 states, 2733 states have (on average 1.2016099524332235) internal successors, (3284), 2733 states have internal predecessors, (3284), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:47,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2738 states to 2738 states and 3288 transitions. [2021-05-06 11:23:47,920 INFO L78 Accepts]: Start accepts. Automaton has 2738 states and 3288 transitions. Word has length 102 [2021-05-06 11:23:47,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:23:47,920 INFO L480 AbstractCegarLoop]: Abstraction has 2738 states and 3288 transitions. [2021-05-06 11:23:47,920 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.6666666666666665) internal successors, (80), 29 states have internal predecessors, (80), 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) [2021-05-06 11:23:47,920 INFO L276 IsEmpty]: Start isEmpty. Operand 2738 states and 3288 transitions. [2021-05-06 11:23:47,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:23:47,922 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:23:47,922 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 5, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:23:47,922 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2021-05-06 11:23:47,922 INFO L428 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:23:47,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:23:47,922 INFO L82 PathProgramCache]: Analyzing trace with hash -1980092734, now seen corresponding path program 29 times [2021-05-06 11:23:47,922 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:23:47,922 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1531531141] [2021-05-06 11:23:47,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:23:47,925 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:23:47,926 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:23:47,926 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:23:48,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:48,512 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:23:48,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:48,515 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:23:48,515 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:23:48,515 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1531531141] [2021-05-06 11:23:48,515 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1531531141] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:23:48,515 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:23:48,515 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:23:48,516 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1742449784] [2021-05-06 11:23:48,516 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:23:48,516 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:23:48,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:23:48,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=233, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:23:48,516 INFO L87 Difference]: Start difference. First operand 2738 states and 3288 transitions. Second operand has 17 states, 17 states have (on average 3.411764705882353) internal successors, (58), 16 states have internal predecessors, (58), 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) [2021-05-06 11:23:50,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:23:50,942 INFO L93 Difference]: Finished difference Result 3030 states and 3657 transitions. [2021-05-06 11:23:50,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 11:23:50,956 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.411764705882353) internal successors, (58), 16 states have internal predecessors, (58), 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 102 [2021-05-06 11:23:50,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:23:50,959 INFO L225 Difference]: With dead ends: 3030 [2021-05-06 11:23:50,959 INFO L226 Difference]: Without dead ends: 2832 [2021-05-06 11:23:50,960 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 727.7ms TimeCoverageRelationStatistics Valid=105, Invalid=707, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:23:50,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2832 states. [2021-05-06 11:23:52,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2832 to 2738. [2021-05-06 11:23:52,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2738 states, 2733 states have (on average 1.2016099524332235) internal successors, (3284), 2733 states have internal predecessors, (3284), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:23:52,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2738 states to 2738 states and 3288 transitions. [2021-05-06 11:23:52,587 INFO L78 Accepts]: Start accepts. Automaton has 2738 states and 3288 transitions. Word has length 102 [2021-05-06 11:23:52,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:23:52,587 INFO L480 AbstractCegarLoop]: Abstraction has 2738 states and 3288 transitions. [2021-05-06 11:23:52,587 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 3.411764705882353) internal successors, (58), 16 states have internal predecessors, (58), 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) [2021-05-06 11:23:52,587 INFO L276 IsEmpty]: Start isEmpty. Operand 2738 states and 3288 transitions. [2021-05-06 11:23:52,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:23:52,589 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:23:52,589 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 7, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:23:52,589 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2021-05-06 11:23:52,590 INFO L428 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:23:52,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:23:52,590 INFO L82 PathProgramCache]: Analyzing trace with hash 39124806, now seen corresponding path program 30 times [2021-05-06 11:23:52,590 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:23:52,590 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2132793851] [2021-05-06 11:23:52,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:23:52,593 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:23:52,593 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:23:52,594 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:23:52,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:53,657 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 33 [2021-05-06 11:23:53,837 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 148 DAG size of output: 45 [2021-05-06 11:23:54,022 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 41 [2021-05-06 11:23:55,063 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:23:55,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:23:55,071 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:23:55,071 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:23:55,071 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2132793851] [2021-05-06 11:23:55,071 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2132793851] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:23:55,071 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:23:55,071 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 11:23:55,071 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900991130] [2021-05-06 11:23:55,072 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 11:23:55,072 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:23:55,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 11:23:55,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=696, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:23:55,072 INFO L87 Difference]: Start difference. First operand 2738 states and 3288 transitions. Second operand has 29 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 28 states have internal predecessors, (73), 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) [2021-05-06 11:24:00,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:00,968 INFO L93 Difference]: Finished difference Result 9380 states and 11255 transitions. [2021-05-06 11:24:00,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 11:24:00,969 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 28 states have internal predecessors, (73), 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 102 [2021-05-06 11:24:00,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:00,973 INFO L225 Difference]: With dead ends: 9380 [2021-05-06 11:24:00,973 INFO L226 Difference]: Without dead ends: 5636 [2021-05-06 11:24:00,978 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 5 SyntacticMatches, 3 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 738 ImplicationChecksByTransitivity, 2924.1ms TimeCoverageRelationStatistics Valid=426, Invalid=2654, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 11:24:00,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5636 states. [2021-05-06 11:24:03,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5636 to 4301. [2021-05-06 11:24:03,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4301 states, 4296 states have (on average 1.1945996275605215) internal successors, (5132), 4296 states have internal predecessors, (5132), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:03,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4301 states to 4301 states and 5136 transitions. [2021-05-06 11:24:03,613 INFO L78 Accepts]: Start accepts. Automaton has 4301 states and 5136 transitions. Word has length 102 [2021-05-06 11:24:03,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:03,613 INFO L480 AbstractCegarLoop]: Abstraction has 4301 states and 5136 transitions. [2021-05-06 11:24:03,614 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 28 states have internal predecessors, (73), 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) [2021-05-06 11:24:03,614 INFO L276 IsEmpty]: Start isEmpty. Operand 4301 states and 5136 transitions. [2021-05-06 11:24:03,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:24:03,618 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:03,618 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 7, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:03,618 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63 [2021-05-06 11:24:03,618 INFO L428 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:03,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:03,619 INFO L82 PathProgramCache]: Analyzing trace with hash -1865298874, now seen corresponding path program 31 times [2021-05-06 11:24:03,619 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:03,619 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1486177751] [2021-05-06 11:24:03,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:03,624 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:24:03,624 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:24:03,625 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:24:03,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:04,072 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 37 [2021-05-06 11:24:04,528 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:04,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:04,531 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:04,531 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:04,532 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1486177751] [2021-05-06 11:24:04,532 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1486177751] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:04,532 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:04,532 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:24:04,532 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712764800] [2021-05-06 11:24:04,532 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:24:04,532 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:04,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:24:04,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:24:04,532 INFO L87 Difference]: Start difference. First operand 4301 states and 5136 transitions. Second operand has 15 states, 15 states have (on average 3.4) internal successors, (51), 14 states have internal predecessors, (51), 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) [2021-05-06 11:24:07,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:07,951 INFO L93 Difference]: Finished difference Result 6667 states and 7941 transitions. [2021-05-06 11:24:07,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 11:24:07,951 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.4) internal successors, (51), 14 states have internal predecessors, (51), 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 102 [2021-05-06 11:24:07,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:07,955 INFO L225 Difference]: With dead ends: 6667 [2021-05-06 11:24:07,955 INFO L226 Difference]: Without dead ends: 4501 [2021-05-06 11:24:07,957 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 966.1ms TimeCoverageRelationStatistics Valid=85, Invalid=515, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:24:07,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4501 states. [2021-05-06 11:24:10,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4501 to 4388. [2021-05-06 11:24:10,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4388 states, 4383 states have (on average 1.189368012776637) internal successors, (5213), 4383 states have internal predecessors, (5213), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:10,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4388 states to 4388 states and 5217 transitions. [2021-05-06 11:24:10,623 INFO L78 Accepts]: Start accepts. Automaton has 4388 states and 5217 transitions. Word has length 102 [2021-05-06 11:24:10,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:10,623 INFO L480 AbstractCegarLoop]: Abstraction has 4388 states and 5217 transitions. [2021-05-06 11:24:10,623 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 3.4) internal successors, (51), 14 states have internal predecessors, (51), 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) [2021-05-06 11:24:10,623 INFO L276 IsEmpty]: Start isEmpty. Operand 4388 states and 5217 transitions. [2021-05-06 11:24:10,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:24:10,626 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:10,626 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 5, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:10,626 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64 [2021-05-06 11:24:10,626 INFO L428 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:10,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:10,626 INFO L82 PathProgramCache]: Analyzing trace with hash -296792246, now seen corresponding path program 32 times [2021-05-06 11:24:10,627 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:10,627 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2028165832] [2021-05-06 11:24:10,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:10,630 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:24:10,630 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:24:10,631 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:24:10,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:11,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:11,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:11,122 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:11,122 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:11,122 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2028165832] [2021-05-06 11:24:11,122 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2028165832] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:11,122 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:11,122 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:24:11,122 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1320616640] [2021-05-06 11:24:11,123 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:24:11,123 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:11,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:24:11,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=232, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:24:11,123 INFO L87 Difference]: Start difference. First operand 4388 states and 5217 transitions. Second operand has 17 states, 17 states have (on average 3.411764705882353) internal successors, (58), 16 states have internal predecessors, (58), 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) [2021-05-06 11:24:14,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:14,512 INFO L93 Difference]: Finished difference Result 4638 states and 5535 transitions. [2021-05-06 11:24:14,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 11:24:14,513 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.411764705882353) internal successors, (58), 16 states have internal predecessors, (58), 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 102 [2021-05-06 11:24:14,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:14,516 INFO L225 Difference]: With dead ends: 4638 [2021-05-06 11:24:14,516 INFO L226 Difference]: Without dead ends: 4440 [2021-05-06 11:24:14,517 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 631.5ms TimeCoverageRelationStatistics Valid=106, Invalid=706, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:24:14,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4440 states. [2021-05-06 11:24:17,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4440 to 4388. [2021-05-06 11:24:17,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4388 states, 4383 states have (on average 1.189368012776637) internal successors, (5213), 4383 states have internal predecessors, (5213), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:17,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4388 states to 4388 states and 5217 transitions. [2021-05-06 11:24:17,199 INFO L78 Accepts]: Start accepts. Automaton has 4388 states and 5217 transitions. Word has length 102 [2021-05-06 11:24:17,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:17,199 INFO L480 AbstractCegarLoop]: Abstraction has 4388 states and 5217 transitions. [2021-05-06 11:24:17,199 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 3.411764705882353) internal successors, (58), 16 states have internal predecessors, (58), 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) [2021-05-06 11:24:17,200 INFO L276 IsEmpty]: Start isEmpty. Operand 4388 states and 5217 transitions. [2021-05-06 11:24:17,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:24:17,203 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:17,203 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 7, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:17,203 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2021-05-06 11:24:17,203 INFO L428 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:17,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:17,203 INFO L82 PathProgramCache]: Analyzing trace with hash -1904666614, now seen corresponding path program 33 times [2021-05-06 11:24:17,204 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:17,204 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1583508682] [2021-05-06 11:24:17,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:17,220 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:24:17,220 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:24:17,221 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:24:17,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:19,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:19,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:19,309 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:19,309 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:19,309 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1583508682] [2021-05-06 11:24:19,309 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1583508682] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:19,309 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:19,309 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 11:24:19,309 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [552325120] [2021-05-06 11:24:19,309 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 11:24:19,310 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:19,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 11:24:19,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=790, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:24:19,310 INFO L87 Difference]: Start difference. First operand 4388 states and 5217 transitions. Second operand has 31 states, 31 states have (on average 2.4516129032258065) internal successors, (76), 30 states have internal predecessors, (76), 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) [2021-05-06 11:24:23,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:23,887 INFO L93 Difference]: Finished difference Result 6092 states and 7297 transitions. [2021-05-06 11:24:23,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 11:24:23,888 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.4516129032258065) internal successors, (76), 30 states have internal predecessors, (76), 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 102 [2021-05-06 11:24:23,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:23,891 INFO L225 Difference]: With dead ends: 6092 [2021-05-06 11:24:23,892 INFO L226 Difference]: Without dead ends: 5772 [2021-05-06 11:24:23,892 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 1881.9ms TimeCoverageRelationStatistics Valid=242, Invalid=1318, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 11:24:23,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5772 states. [2021-05-06 11:24:26,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5772 to 4518. [2021-05-06 11:24:26,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4518 states, 4513 states have (on average 1.1872368712608021) internal successors, (5358), 4513 states have internal predecessors, (5358), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:26,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4518 states to 4518 states and 5362 transitions. [2021-05-06 11:24:26,689 INFO L78 Accepts]: Start accepts. Automaton has 4518 states and 5362 transitions. Word has length 102 [2021-05-06 11:24:26,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:26,689 INFO L480 AbstractCegarLoop]: Abstraction has 4518 states and 5362 transitions. [2021-05-06 11:24:26,689 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.4516129032258065) internal successors, (76), 30 states have internal predecessors, (76), 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) [2021-05-06 11:24:26,689 INFO L276 IsEmpty]: Start isEmpty. Operand 4518 states and 5362 transitions. [2021-05-06 11:24:26,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:24:26,694 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:26,694 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 7, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:26,694 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66 [2021-05-06 11:24:26,694 INFO L428 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:26,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:26,694 INFO L82 PathProgramCache]: Analyzing trace with hash -181998386, now seen corresponding path program 34 times [2021-05-06 11:24:26,694 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:26,695 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1289369479] [2021-05-06 11:24:26,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:26,698 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:24:26,699 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:24:26,699 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:24:26,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:27,415 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:27,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:27,418 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:27,418 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:27,418 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1289369479] [2021-05-06 11:24:27,418 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1289369479] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:27,418 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:27,418 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:24:27,418 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1968347283] [2021-05-06 11:24:27,418 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:24:27,419 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:27,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:24:27,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:24:27,419 INFO L87 Difference]: Start difference. First operand 4518 states and 5362 transitions. Second operand has 16 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 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) [2021-05-06 11:24:31,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:31,099 INFO L93 Difference]: Finished difference Result 7596 states and 9032 transitions. [2021-05-06 11:24:31,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:24:31,100 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 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 102 [2021-05-06 11:24:31,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:31,103 INFO L225 Difference]: With dead ends: 7596 [2021-05-06 11:24:31,103 INFO L226 Difference]: Without dead ends: 4777 [2021-05-06 11:24:31,106 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 963.1ms TimeCoverageRelationStatistics Valid=92, Invalid=610, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:24:31,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4777 states. [2021-05-06 11:24:33,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4777 to 4077. [2021-05-06 11:24:33,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4077 states, 4072 states have (on average 1.206041257367387) internal successors, (4911), 4072 states have internal predecessors, (4911), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:33,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4077 states to 4077 states and 4915 transitions. [2021-05-06 11:24:33,720 INFO L78 Accepts]: Start accepts. Automaton has 4077 states and 4915 transitions. Word has length 102 [2021-05-06 11:24:33,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:33,720 INFO L480 AbstractCegarLoop]: Abstraction has 4077 states and 4915 transitions. [2021-05-06 11:24:33,721 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 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) [2021-05-06 11:24:33,721 INFO L276 IsEmpty]: Start isEmpty. Operand 4077 states and 4915 transitions. [2021-05-06 11:24:33,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:24:33,724 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:33,724 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 5, 5, 5, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:33,724 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67 [2021-05-06 11:24:33,724 INFO L428 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:33,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:33,724 INFO L82 PathProgramCache]: Analyzing trace with hash 1003439112, now seen corresponding path program 35 times [2021-05-06 11:24:33,724 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:33,724 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [595548698] [2021-05-06 11:24:33,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:33,733 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:24:33,734 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:24:33,734 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:24:33,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:34,365 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:34,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:34,368 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:34,368 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:34,368 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [595548698] [2021-05-06 11:24:34,368 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [595548698] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:34,368 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:34,369 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:24:34,369 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273845927] [2021-05-06 11:24:34,369 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:24:34,369 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:34,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:24:34,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=264, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:24:34,369 INFO L87 Difference]: Start difference. First operand 4077 states and 4915 transitions. Second operand has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 17 states have internal predecessors, (59), 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) [2021-05-06 11:24:37,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:37,868 INFO L93 Difference]: Finished difference Result 4298 states and 5199 transitions. [2021-05-06 11:24:37,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 11:24:37,868 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 17 states have internal predecessors, (59), 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 102 [2021-05-06 11:24:37,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:37,871 INFO L225 Difference]: With dead ends: 4298 [2021-05-06 11:24:37,871 INFO L226 Difference]: Without dead ends: 4112 [2021-05-06 11:24:37,872 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 858.1ms TimeCoverageRelationStatistics Valid=113, Invalid=817, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:24:37,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4112 states. [2021-05-06 11:24:40,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4112 to 4077. [2021-05-06 11:24:40,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4077 states, 4072 states have (on average 1.206041257367387) internal successors, (4911), 4072 states have internal predecessors, (4911), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:40,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4077 states to 4077 states and 4915 transitions. [2021-05-06 11:24:40,549 INFO L78 Accepts]: Start accepts. Automaton has 4077 states and 4915 transitions. Word has length 102 [2021-05-06 11:24:40,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:40,549 INFO L480 AbstractCegarLoop]: Abstraction has 4077 states and 4915 transitions. [2021-05-06 11:24:40,549 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 17 states have internal predecessors, (59), 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) [2021-05-06 11:24:40,549 INFO L276 IsEmpty]: Start isEmpty. Operand 4077 states and 4915 transitions. [2021-05-06 11:24:40,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:24:40,554 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:40,554 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 6, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:40,554 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68 [2021-05-06 11:24:40,555 INFO L428 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:40,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:40,555 INFO L82 PathProgramCache]: Analyzing trace with hash 610412102, now seen corresponding path program 36 times [2021-05-06 11:24:40,555 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:40,555 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [993533892] [2021-05-06 11:24:40,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:40,560 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:24:40,560 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:24:40,561 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:24:40,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:40,949 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 135 DAG size of output: 40 [2021-05-06 11:24:42,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:42,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:42,145 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:42,145 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:42,145 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [993533892] [2021-05-06 11:24:42,145 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [993533892] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:42,145 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:42,145 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:24:42,146 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106958842] [2021-05-06 11:24:42,146 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:24:42,146 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:42,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:24:42,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=397, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:24:42,146 INFO L87 Difference]: Start difference. First operand 4077 states and 4915 transitions. Second operand has 22 states, 22 states have (on average 2.909090909090909) internal successors, (64), 21 states have internal predecessors, (64), 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) [2021-05-06 11:24:46,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:46,652 INFO L93 Difference]: Finished difference Result 5716 states and 6888 transitions. [2021-05-06 11:24:46,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:24:46,653 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.909090909090909) internal successors, (64), 21 states have internal predecessors, (64), 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 102 [2021-05-06 11:24:46,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:46,658 INFO L225 Difference]: With dead ends: 5716 [2021-05-06 11:24:46,658 INFO L226 Difference]: Without dead ends: 5466 [2021-05-06 11:24:46,659 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 13 SyntacticMatches, 7 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 277 ImplicationChecksByTransitivity, 1631.4ms TimeCoverageRelationStatistics Valid=238, Invalid=1244, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 11:24:46,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5466 states. [2021-05-06 11:24:49,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5466 to 4681. [2021-05-06 11:24:49,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4681 states, 4676 states have (on average 1.2033789563729684) internal successors, (5627), 4676 states have internal predecessors, (5627), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:49,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4681 states to 4681 states and 5631 transitions. [2021-05-06 11:24:49,996 INFO L78 Accepts]: Start accepts. Automaton has 4681 states and 5631 transitions. Word has length 102 [2021-05-06 11:24:49,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:49,996 INFO L480 AbstractCegarLoop]: Abstraction has 4681 states and 5631 transitions. [2021-05-06 11:24:49,996 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.909090909090909) internal successors, (64), 21 states have internal predecessors, (64), 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) [2021-05-06 11:24:49,996 INFO L276 IsEmpty]: Start isEmpty. Operand 4681 states and 5631 transitions. [2021-05-06 11:24:49,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:24:49,999 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:49,999 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 6, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:49,999 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69 [2021-05-06 11:24:49,999 INFO L428 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:50,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:50,000 INFO L82 PathProgramCache]: Analyzing trace with hash 416633098, now seen corresponding path program 37 times [2021-05-06 11:24:50,000 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:50,000 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [457714701] [2021-05-06 11:24:50,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:50,003 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:24:50,003 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:24:50,004 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:24:50,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:50,454 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 135 DAG size of output: 40 [2021-05-06 11:24:51,693 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:51,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:51,696 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:51,696 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:51,696 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [457714701] [2021-05-06 11:24:51,696 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [457714701] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:51,696 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:51,697 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 11:24:51,697 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1253460058] [2021-05-06 11:24:51,697 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 11:24:51,697 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:51,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 11:24:51,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:24:51,698 INFO L87 Difference]: Start difference. First operand 4681 states and 5631 transitions. Second operand has 23 states, 23 states have (on average 2.8260869565217392) internal successors, (65), 22 states have internal predecessors, (65), 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) [2021-05-06 11:24:56,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:24:56,299 INFO L93 Difference]: Finished difference Result 5725 states and 6897 transitions. [2021-05-06 11:24:56,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 11:24:56,299 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.8260869565217392) internal successors, (65), 22 states have internal predecessors, (65), 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 102 [2021-05-06 11:24:56,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:24:56,304 INFO L225 Difference]: With dead ends: 5725 [2021-05-06 11:24:56,304 INFO L226 Difference]: Without dead ends: 5478 [2021-05-06 11:24:56,305 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 13 SyntacticMatches, 6 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 1804.2ms TimeCoverageRelationStatistics Valid=253, Invalid=1387, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 11:24:56,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5478 states. [2021-05-06 11:24:59,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5478 to 4621. [2021-05-06 11:24:59,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4621 states, 4616 states have (on average 1.2060225303292895) internal successors, (5567), 4616 states have internal predecessors, (5567), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:24:59,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4621 states to 4621 states and 5571 transitions. [2021-05-06 11:24:59,377 INFO L78 Accepts]: Start accepts. Automaton has 4621 states and 5571 transitions. Word has length 102 [2021-05-06 11:24:59,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:24:59,377 INFO L480 AbstractCegarLoop]: Abstraction has 4621 states and 5571 transitions. [2021-05-06 11:24:59,377 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.8260869565217392) internal successors, (65), 22 states have internal predecessors, (65), 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) [2021-05-06 11:24:59,377 INFO L276 IsEmpty]: Start isEmpty. Operand 4621 states and 5571 transitions. [2021-05-06 11:24:59,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:24:59,381 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:24:59,381 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 8, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:24:59,381 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70 [2021-05-06 11:24:59,381 INFO L428 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:24:59,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:24:59,381 INFO L82 PathProgramCache]: Analyzing trace with hash 725205962, now seen corresponding path program 38 times [2021-05-06 11:24:59,381 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:24:59,381 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [6924166] [2021-05-06 11:24:59,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:24:59,385 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:24:59,385 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:24:59,386 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:24:59,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:59,846 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:24:59,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:24:59,848 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:24:59,848 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:24:59,848 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [6924166] [2021-05-06 11:24:59,848 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [6924166] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:24:59,848 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:24:59,849 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:24:59,849 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876225714] [2021-05-06 11:24:59,849 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:24:59,849 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:24:59,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:24:59,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:24:59,849 INFO L87 Difference]: Start difference. First operand 4621 states and 5571 transitions. Second operand has 10 states, 10 states have (on average 3.7) internal successors, (37), 9 states have internal predecessors, (37), 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) [2021-05-06 11:25:03,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:25:03,251 INFO L93 Difference]: Finished difference Result 8005 states and 9629 transitions. [2021-05-06 11:25:03,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:25:03,251 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.7) internal successors, (37), 9 states have internal predecessors, (37), 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 102 [2021-05-06 11:25:03,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:25:03,255 INFO L225 Difference]: With dead ends: 8005 [2021-05-06 11:25:03,255 INFO L226 Difference]: Without dead ends: 4849 [2021-05-06 11:25:03,259 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 494.0ms TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:25:03,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4849 states. [2021-05-06 11:25:06,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4849 to 4783. [2021-05-06 11:25:06,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4783 states, 4778 states have (on average 1.198618668899121) internal successors, (5727), 4778 states have internal predecessors, (5727), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:25:06,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4783 states to 4783 states and 5731 transitions. [2021-05-06 11:25:06,395 INFO L78 Accepts]: Start accepts. Automaton has 4783 states and 5731 transitions. Word has length 102 [2021-05-06 11:25:06,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:25:06,395 INFO L480 AbstractCegarLoop]: Abstraction has 4783 states and 5731 transitions. [2021-05-06 11:25:06,395 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.7) internal successors, (37), 9 states have internal predecessors, (37), 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) [2021-05-06 11:25:06,396 INFO L276 IsEmpty]: Start isEmpty. Operand 4783 states and 5731 transitions. [2021-05-06 11:25:06,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:25:06,398 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:25:06,399 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 6, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:25:06,399 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71 [2021-05-06 11:25:06,399 INFO L428 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:25:06,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:25:06,399 INFO L82 PathProgramCache]: Analyzing trace with hash 44957194, now seen corresponding path program 39 times [2021-05-06 11:25:06,399 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:25:06,399 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [206083662] [2021-05-06 11:25:06,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:25:06,403 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:25:06,403 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:25:06,403 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:25:06,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:06,952 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 123 DAG size of output: 39 [2021-05-06 11:25:07,508 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 43 [2021-05-06 11:25:07,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:25:07,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:07,680 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:25:07,680 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:25:07,680 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [206083662] [2021-05-06 11:25:07,680 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [206083662] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:25:07,680 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:25:07,680 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:25:07,680 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353962598] [2021-05-06 11:25:07,680 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:25:07,680 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:25:07,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:25:07,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:25:07,681 INFO L87 Difference]: Start difference. First operand 4783 states and 5731 transitions. Second operand has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 16 states have internal predecessors, (49), 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) [2021-05-06 11:25:12,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:25:12,049 INFO L93 Difference]: Finished difference Result 5815 states and 6947 transitions. [2021-05-06 11:25:12,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 11:25:12,050 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 16 states have internal predecessors, (49), 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 102 [2021-05-06 11:25:12,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:25:12,054 INFO L225 Difference]: With dead ends: 5815 [2021-05-06 11:25:12,054 INFO L226 Difference]: Without dead ends: 5533 [2021-05-06 11:25:12,055 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 13 SyntacticMatches, 7 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 1240.5ms TimeCoverageRelationStatistics Valid=166, Invalid=704, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:25:12,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5533 states. [2021-05-06 11:25:15,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5533 to 4783. [2021-05-06 11:25:15,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4783 states, 4778 states have (on average 1.1975722059439096) internal successors, (5722), 4778 states have internal predecessors, (5722), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:25:15,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4783 states to 4783 states and 5726 transitions. [2021-05-06 11:25:15,218 INFO L78 Accepts]: Start accepts. Automaton has 4783 states and 5726 transitions. Word has length 102 [2021-05-06 11:25:15,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:25:15,218 INFO L480 AbstractCegarLoop]: Abstraction has 4783 states and 5726 transitions. [2021-05-06 11:25:15,218 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 16 states have internal predecessors, (49), 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) [2021-05-06 11:25:15,218 INFO L276 IsEmpty]: Start isEmpty. Operand 4783 states and 5726 transitions. [2021-05-06 11:25:15,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:25:15,221 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:25:15,221 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 8, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:25:15,221 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72 [2021-05-06 11:25:15,221 INFO L428 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:25:15,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:25:15,222 INFO L82 PathProgramCache]: Analyzing trace with hash -1497426230, now seen corresponding path program 40 times [2021-05-06 11:25:15,222 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:25:15,222 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [970701096] [2021-05-06 11:25:15,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:25:15,232 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:25:15,232 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:25:15,233 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:25:15,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:16,154 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 44 [2021-05-06 11:25:16,297 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:25:16,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:16,314 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:25:16,314 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:25:16,314 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [970701096] [2021-05-06 11:25:16,314 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [970701096] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:25:16,314 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:25:16,315 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:25:16,315 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842210486] [2021-05-06 11:25:16,315 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:25:16,315 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:25:16,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:25:16,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:25:16,315 INFO L87 Difference]: Start difference. First operand 4783 states and 5726 transitions. Second operand has 14 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 13 states have internal predecessors, (46), 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) [2021-05-06 11:25:22,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:25:22,510 INFO L93 Difference]: Finished difference Result 9047 states and 10788 transitions. [2021-05-06 11:25:22,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 11:25:22,510 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 13 states have internal predecessors, (46), 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 102 [2021-05-06 11:25:22,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:25:22,516 INFO L225 Difference]: With dead ends: 9047 [2021-05-06 11:25:22,516 INFO L226 Difference]: Without dead ends: 8255 [2021-05-06 11:25:22,518 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 14 SyntacticMatches, 7 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 828.6ms TimeCoverageRelationStatistics Valid=100, Invalid=362, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:25:22,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8255 states. [2021-05-06 11:25:25,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8255 to 4789. [2021-05-06 11:25:25,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4789 states, 4784 states have (on average 1.1969063545150502) internal successors, (5726), 4784 states have internal predecessors, (5726), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:25:25,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4789 states to 4789 states and 5730 transitions. [2021-05-06 11:25:25,792 INFO L78 Accepts]: Start accepts. Automaton has 4789 states and 5730 transitions. Word has length 102 [2021-05-06 11:25:25,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:25:25,792 INFO L480 AbstractCegarLoop]: Abstraction has 4789 states and 5730 transitions. [2021-05-06 11:25:25,792 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 13 states have internal predecessors, (46), 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) [2021-05-06 11:25:25,793 INFO L276 IsEmpty]: Start isEmpty. Operand 4789 states and 5730 transitions. [2021-05-06 11:25:25,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:25:25,795 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:25:25,795 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 6, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:25:25,795 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73 [2021-05-06 11:25:25,795 INFO L428 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:25:25,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:25:25,796 INFO L82 PathProgramCache]: Analyzing trace with hash -1558120830, now seen corresponding path program 41 times [2021-05-06 11:25:25,796 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:25:25,796 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1719946738] [2021-05-06 11:25:25,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:25:25,808 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:25:25,808 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:25:25,808 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:25:25,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:26,100 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 31 [2021-05-06 11:25:26,518 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:25:26,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:26,520 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:25:26,521 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:25:26,521 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1719946738] [2021-05-06 11:25:26,521 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1719946738] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:25:26,521 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:25:26,521 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:25:26,521 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283883559] [2021-05-06 11:25:26,521 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:25:26,521 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:25:26,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:25:26,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:25:26,521 INFO L87 Difference]: Start difference. First operand 4789 states and 5730 transitions. Second operand has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 12 states have internal predecessors, (46), 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) [2021-05-06 11:25:30,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:25:30,491 INFO L93 Difference]: Finished difference Result 5457 states and 6511 transitions. [2021-05-06 11:25:30,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 11:25:30,491 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 12 states have internal predecessors, (46), 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 102 [2021-05-06 11:25:30,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:25:30,496 INFO L225 Difference]: With dead ends: 5457 [2021-05-06 11:25:30,496 INFO L226 Difference]: Without dead ends: 5175 [2021-05-06 11:25:30,497 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 833.3ms TimeCoverageRelationStatistics Valid=71, Invalid=349, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:25:30,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5175 states. [2021-05-06 11:25:33,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5175 to 4846. [2021-05-06 11:25:33,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4846 states, 4841 states have (on average 1.1956207395166287) internal successors, (5788), 4841 states have internal predecessors, (5788), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:25:33,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4846 states to 4846 states and 5792 transitions. [2021-05-06 11:25:33,982 INFO L78 Accepts]: Start accepts. Automaton has 4846 states and 5792 transitions. Word has length 102 [2021-05-06 11:25:33,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:25:33,983 INFO L480 AbstractCegarLoop]: Abstraction has 4846 states and 5792 transitions. [2021-05-06 11:25:33,983 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 12 states have internal predecessors, (46), 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) [2021-05-06 11:25:33,983 INFO L276 IsEmpty]: Start isEmpty. Operand 4846 states and 5792 transitions. [2021-05-06 11:25:33,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:25:33,987 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:25:33,987 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 8, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:25:33,987 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74 [2021-05-06 11:25:33,987 INFO L428 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:25:33,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:25:33,988 INFO L82 PathProgramCache]: Analyzing trace with hash 1194463042, now seen corresponding path program 42 times [2021-05-06 11:25:33,988 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:25:33,988 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1968448135] [2021-05-06 11:25:33,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:25:33,994 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:25:33,994 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:25:33,995 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:25:34,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:34,615 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:25:34,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:34,617 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:25:34,617 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:25:34,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1968448135] [2021-05-06 11:25:34,617 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1968448135] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:25:34,618 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:25:34,618 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:25:34,618 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1938741982] [2021-05-06 11:25:34,618 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:25:34,618 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:25:34,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:25:34,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:25:34,618 INFO L87 Difference]: Start difference. First operand 4846 states and 5792 transitions. Second operand has 13 states, 13 states have (on average 3.4615384615384617) internal successors, (45), 12 states have internal predecessors, (45), 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) [2021-05-06 11:25:38,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:25:38,851 INFO L93 Difference]: Finished difference Result 8777 states and 10496 transitions. [2021-05-06 11:25:38,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 11:25:38,851 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.4615384615384617) internal successors, (45), 12 states have internal predecessors, (45), 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 102 [2021-05-06 11:25:38,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:25:38,856 INFO L225 Difference]: With dead ends: 8777 [2021-05-06 11:25:38,856 INFO L226 Difference]: Without dead ends: 5597 [2021-05-06 11:25:38,861 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 640.3ms TimeCoverageRelationStatistics Valid=71, Invalid=349, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:25:38,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5597 states. [2021-05-06 11:25:42,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5597 to 5338. [2021-05-06 11:25:42,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5338 states, 5333 states have (on average 1.1974498406150385) internal successors, (6386), 5333 states have internal predecessors, (6386), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:25:42,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5338 states to 5338 states and 6390 transitions. [2021-05-06 11:25:42,567 INFO L78 Accepts]: Start accepts. Automaton has 5338 states and 6390 transitions. Word has length 102 [2021-05-06 11:25:42,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:25:42,567 INFO L480 AbstractCegarLoop]: Abstraction has 5338 states and 6390 transitions. [2021-05-06 11:25:42,567 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.4615384615384617) internal successors, (45), 12 states have internal predecessors, (45), 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) [2021-05-06 11:25:42,567 INFO L276 IsEmpty]: Start isEmpty. Operand 5338 states and 6390 transitions. [2021-05-06 11:25:42,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:25:42,571 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:25:42,571 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 6, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:25:42,571 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75 [2021-05-06 11:25:42,572 INFO L428 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:25:42,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:25:42,572 INFO L82 PathProgramCache]: Analyzing trace with hash -1787981558, now seen corresponding path program 43 times [2021-05-06 11:25:42,572 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:25:42,572 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1155530526] [2021-05-06 11:25:42,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:25:42,575 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:25:42,575 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:25:42,576 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:25:42,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:42,822 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 31 [2021-05-06 11:25:43,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:25:43,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:43,245 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:25:43,245 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:25:43,245 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1155530526] [2021-05-06 11:25:43,245 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1155530526] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:25:43,245 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:25:43,245 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:25:43,245 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [578964445] [2021-05-06 11:25:43,246 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:25:43,246 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:25:43,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:25:43,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:25:43,246 INFO L87 Difference]: Start difference. First operand 5338 states and 6390 transitions. Second operand has 14 states, 14 states have (on average 3.5) internal successors, (49), 13 states have internal predecessors, (49), 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) [2021-05-06 11:25:47,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:25:47,669 INFO L93 Difference]: Finished difference Result 6053 states and 7210 transitions. [2021-05-06 11:25:47,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:25:47,669 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.5) internal successors, (49), 13 states have internal predecessors, (49), 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 102 [2021-05-06 11:25:47,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:25:47,674 INFO L225 Difference]: With dead ends: 6053 [2021-05-06 11:25:47,675 INFO L226 Difference]: Without dead ends: 5738 [2021-05-06 11:25:47,676 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 821.4ms TimeCoverageRelationStatistics Valid=78, Invalid=428, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:25:47,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5738 states. [2021-05-06 11:25:51,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5738 to 5365. [2021-05-06 11:25:51,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5365 states, 5360 states have (on average 1.1955223880597015) internal successors, (6408), 5360 states have internal predecessors, (6408), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:25:51,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5365 states to 5365 states and 6412 transitions. [2021-05-06 11:25:51,368 INFO L78 Accepts]: Start accepts. Automaton has 5365 states and 6412 transitions. Word has length 102 [2021-05-06 11:25:51,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:25:51,368 INFO L480 AbstractCegarLoop]: Abstraction has 5365 states and 6412 transitions. [2021-05-06 11:25:51,368 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.5) internal successors, (49), 13 states have internal predecessors, (49), 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) [2021-05-06 11:25:51,368 INFO L276 IsEmpty]: Start isEmpty. Operand 5365 states and 6412 transitions. [2021-05-06 11:25:51,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:25:51,372 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:25:51,372 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 8, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:25:51,372 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76 [2021-05-06 11:25:51,372 INFO L428 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:25:51,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:25:51,372 INFO L82 PathProgramCache]: Analyzing trace with hash 964602314, now seen corresponding path program 44 times [2021-05-06 11:25:51,372 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:25:51,373 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [166544755] [2021-05-06 11:25:51,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:25:51,376 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:25:51,376 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:25:51,377 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:25:51,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:51,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:25:51,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:25:51,924 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:25:51,925 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:25:51,925 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [166544755] [2021-05-06 11:25:51,925 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [166544755] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:25:51,925 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:25:51,925 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:25:51,925 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [967972644] [2021-05-06 11:25:51,925 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:25:51,925 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:25:51,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:25:51,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:25:51,925 INFO L87 Difference]: Start difference. First operand 5365 states and 6412 transitions. Second operand has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 13 states have internal predecessors, (48), 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) [2021-05-06 11:25:56,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:25:56,432 INFO L93 Difference]: Finished difference Result 9359 states and 11126 transitions. [2021-05-06 11:25:56,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:25:56,432 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 13 states have internal predecessors, (48), 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 102 [2021-05-06 11:25:56,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:25:56,437 INFO L225 Difference]: With dead ends: 9359 [2021-05-06 11:25:56,437 INFO L226 Difference]: Without dead ends: 5924 [2021-05-06 11:25:56,440 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 688.8ms TimeCoverageRelationStatistics Valid=78, Invalid=428, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:25:56,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5924 states. [2021-05-06 11:26:00,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5924 to 5533. [2021-05-06 11:26:00,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5533 states, 5528 states have (on average 1.189218523878437) internal successors, (6574), 5528 states have internal predecessors, (6574), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:00,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5533 states to 5533 states and 6578 transitions. [2021-05-06 11:26:00,251 INFO L78 Accepts]: Start accepts. Automaton has 5533 states and 6578 transitions. Word has length 102 [2021-05-06 11:26:00,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:26:00,251 INFO L480 AbstractCegarLoop]: Abstraction has 5533 states and 6578 transitions. [2021-05-06 11:26:00,252 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 13 states have internal predecessors, (48), 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) [2021-05-06 11:26:00,252 INFO L276 IsEmpty]: Start isEmpty. Operand 5533 states and 6578 transitions. [2021-05-06 11:26:00,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:26:00,256 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:26:00,256 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 6, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:26:00,256 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77 [2021-05-06 11:26:00,256 INFO L428 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:26:00,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:26:00,256 INFO L82 PathProgramCache]: Analyzing trace with hash 1673675650, now seen corresponding path program 45 times [2021-05-06 11:26:00,256 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:26:00,256 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2127186429] [2021-05-06 11:26:00,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:26:00,260 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:26:00,260 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:26:00,260 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:26:00,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:00,661 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 42 [2021-05-06 11:26:00,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:26:00,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:00,952 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:26:00,953 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:26:00,953 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2127186429] [2021-05-06 11:26:00,953 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2127186429] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:26:00,953 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:26:00,953 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:26:00,953 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676445392] [2021-05-06 11:26:00,953 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:26:00,953 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:26:00,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:26:00,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:26:00,953 INFO L87 Difference]: Start difference. First operand 5533 states and 6578 transitions. Second operand has 15 states, 15 states have (on average 3.466666666666667) internal successors, (52), 14 states have internal predecessors, (52), 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) [2021-05-06 11:26:05,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:26:05,684 INFO L93 Difference]: Finished difference Result 6289 states and 7441 transitions. [2021-05-06 11:26:05,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 11:26:05,685 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.466666666666667) internal successors, (52), 14 states have internal predecessors, (52), 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 102 [2021-05-06 11:26:05,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:26:05,689 INFO L225 Difference]: With dead ends: 6289 [2021-05-06 11:26:05,689 INFO L226 Difference]: Without dead ends: 5953 [2021-05-06 11:26:05,690 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 913.3ms TimeCoverageRelationStatistics Valid=85, Invalid=515, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:26:05,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5953 states. [2021-05-06 11:26:09,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5953 to 5635. [2021-05-06 11:26:09,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5635 states, 5630 states have (on average 1.185790408525755) internal successors, (6676), 5630 states have internal predecessors, (6676), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:09,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5635 states to 5635 states and 6680 transitions. [2021-05-06 11:26:09,522 INFO L78 Accepts]: Start accepts. Automaton has 5635 states and 6680 transitions. Word has length 102 [2021-05-06 11:26:09,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:26:09,522 INFO L480 AbstractCegarLoop]: Abstraction has 5635 states and 6680 transitions. [2021-05-06 11:26:09,522 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 3.466666666666667) internal successors, (52), 14 states have internal predecessors, (52), 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) [2021-05-06 11:26:09,522 INFO L276 IsEmpty]: Start isEmpty. Operand 5635 states and 6680 transitions. [2021-05-06 11:26:09,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:26:09,526 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:26:09,526 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 8, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:26:09,526 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78 [2021-05-06 11:26:09,526 INFO L428 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:26:09,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:26:09,527 INFO L82 PathProgramCache]: Analyzing trace with hash 131292226, now seen corresponding path program 46 times [2021-05-06 11:26:09,527 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:26:09,527 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1097991476] [2021-05-06 11:26:09,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:26:09,530 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:26:09,530 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:26:09,531 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:26:09,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:10,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:26:10,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:10,087 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:26:10,087 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:26:10,087 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1097991476] [2021-05-06 11:26:10,087 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1097991476] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:26:10,087 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:26:10,088 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:26:10,088 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2040079760] [2021-05-06 11:26:10,088 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:26:10,088 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:26:10,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:26:10,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:26:10,088 INFO L87 Difference]: Start difference. First operand 5635 states and 6680 transitions. Second operand has 15 states, 15 states have (on average 3.4) internal successors, (51), 14 states have internal predecessors, (51), 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) [2021-05-06 11:26:14,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:26:14,907 INFO L93 Difference]: Finished difference Result 8969 states and 10519 transitions. [2021-05-06 11:26:14,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 11:26:14,908 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.4) internal successors, (51), 14 states have internal predecessors, (51), 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 102 [2021-05-06 11:26:14,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:26:14,913 INFO L225 Difference]: With dead ends: 8969 [2021-05-06 11:26:14,913 INFO L226 Difference]: Without dead ends: 6269 [2021-05-06 11:26:14,916 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 734.8ms TimeCoverageRelationStatistics Valid=85, Invalid=515, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:26:14,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6269 states. [2021-05-06 11:26:18,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6269 to 5728. [2021-05-06 11:26:18,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5728 states, 5723 states have (on average 1.1817228726192557) internal successors, (6763), 5723 states have internal predecessors, (6763), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:18,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5728 states to 5728 states and 6767 transitions. [2021-05-06 11:26:18,877 INFO L78 Accepts]: Start accepts. Automaton has 5728 states and 6767 transitions. Word has length 102 [2021-05-06 11:26:18,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:26:18,877 INFO L480 AbstractCegarLoop]: Abstraction has 5728 states and 6767 transitions. [2021-05-06 11:26:18,877 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 3.4) internal successors, (51), 14 states have internal predecessors, (51), 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) [2021-05-06 11:26:18,877 INFO L276 IsEmpty]: Start isEmpty. Operand 5728 states and 6767 transitions. [2021-05-06 11:26:18,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:26:18,880 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:26:18,880 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 6, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:26:18,880 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79 [2021-05-06 11:26:18,880 INFO L428 AbstractCegarLoop]: === Iteration 81 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:26:18,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:26:18,881 INFO L82 PathProgramCache]: Analyzing trace with hash -937991158, now seen corresponding path program 47 times [2021-05-06 11:26:18,881 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:26:18,881 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1337966122] [2021-05-06 11:26:18,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:26:18,888 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:26:18,888 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:26:18,889 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:26:18,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:19,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:26:19,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:19,586 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:26:19,586 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:26:19,586 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1337966122] [2021-05-06 11:26:19,586 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1337966122] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:26:19,586 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:26:19,586 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:26:19,586 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015380380] [2021-05-06 11:26:19,586 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:26:19,586 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:26:19,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:26:19,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:26:19,587 INFO L87 Difference]: Start difference. First operand 5728 states and 6767 transitions. Second operand has 16 states, 16 states have (on average 3.4375) internal successors, (55), 15 states have internal predecessors, (55), 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) [2021-05-06 11:26:24,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:26:24,469 INFO L93 Difference]: Finished difference Result 6407 states and 7543 transitions. [2021-05-06 11:26:24,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:26:24,469 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.4375) internal successors, (55), 15 states have internal predecessors, (55), 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 102 [2021-05-06 11:26:24,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:26:24,474 INFO L225 Difference]: With dead ends: 6407 [2021-05-06 11:26:24,474 INFO L226 Difference]: Without dead ends: 6059 [2021-05-06 11:26:24,475 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 956.0ms TimeCoverageRelationStatistics Valid=92, Invalid=610, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:26:24,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6059 states. [2021-05-06 11:26:28,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6059 to 5695. [2021-05-06 11:26:28,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5695 states, 5690 states have (on average 1.1818980667838312) internal successors, (6725), 5690 states have internal predecessors, (6725), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:28,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5695 states to 5695 states and 6729 transitions. [2021-05-06 11:26:28,404 INFO L78 Accepts]: Start accepts. Automaton has 5695 states and 6729 transitions. Word has length 102 [2021-05-06 11:26:28,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:26:28,404 INFO L480 AbstractCegarLoop]: Abstraction has 5695 states and 6729 transitions. [2021-05-06 11:26:28,404 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.4375) internal successors, (55), 15 states have internal predecessors, (55), 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) [2021-05-06 11:26:28,404 INFO L276 IsEmpty]: Start isEmpty. Operand 5695 states and 6729 transitions. [2021-05-06 11:26:28,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:26:28,408 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:26:28,408 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 8, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:26:28,408 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80 [2021-05-06 11:26:28,408 INFO L428 AbstractCegarLoop]: === Iteration 82 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:26:28,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:26:28,408 INFO L82 PathProgramCache]: Analyzing trace with hash 1814592714, now seen corresponding path program 48 times [2021-05-06 11:26:28,408 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:26:28,408 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1839117903] [2021-05-06 11:26:28,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:26:28,412 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:26:28,412 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:26:28,413 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:26:28,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:29,021 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:26:29,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:29,023 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:26:29,023 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:26:29,023 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1839117903] [2021-05-06 11:26:29,023 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1839117903] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:26:29,023 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:26:29,023 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:26:29,023 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422203017] [2021-05-06 11:26:29,024 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:26:29,024 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:26:29,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:26:29,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:26:29,024 INFO L87 Difference]: Start difference. First operand 5695 states and 6729 transitions. Second operand has 15 states, 15 states have (on average 3.466666666666667) internal successors, (52), 14 states have internal predecessors, (52), 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) [2021-05-06 11:26:34,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:26:34,093 INFO L93 Difference]: Finished difference Result 10038 states and 11789 transitions. [2021-05-06 11:26:34,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:26:34,093 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.466666666666667) internal successors, (52), 14 states have internal predecessors, (52), 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 102 [2021-05-06 11:26:34,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:26:34,098 INFO L225 Difference]: With dead ends: 10038 [2021-05-06 11:26:34,098 INFO L226 Difference]: Without dead ends: 6484 [2021-05-06 11:26:34,101 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 764.5ms TimeCoverageRelationStatistics Valid=72, Invalid=528, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:26:34,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6484 states. [2021-05-06 11:26:38,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6484 to 5224. [2021-05-06 11:26:38,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5224 states, 5219 states have (on average 1.197547422877946) internal successors, (6250), 5219 states have internal predecessors, (6250), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:38,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5224 states to 5224 states and 6254 transitions. [2021-05-06 11:26:38,672 INFO L78 Accepts]: Start accepts. Automaton has 5224 states and 6254 transitions. Word has length 102 [2021-05-06 11:26:38,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:26:38,672 INFO L480 AbstractCegarLoop]: Abstraction has 5224 states and 6254 transitions. [2021-05-06 11:26:38,672 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 3.466666666666667) internal successors, (52), 14 states have internal predecessors, (52), 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) [2021-05-06 11:26:38,672 INFO L276 IsEmpty]: Start isEmpty. Operand 5224 states and 6254 transitions. [2021-05-06 11:26:38,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:26:38,676 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:26:38,676 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 6, 6, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:26:38,676 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81 [2021-05-06 11:26:38,676 INFO L428 AbstractCegarLoop]: === Iteration 83 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:26:38,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:26:38,676 INFO L82 PathProgramCache]: Analyzing trace with hash 556019204, now seen corresponding path program 49 times [2021-05-06 11:26:38,677 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:26:38,677 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [967109288] [2021-05-06 11:26:38,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:26:38,683 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:26:38,683 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:26:38,684 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:26:38,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:39,499 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:26:39,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:39,501 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:26:39,501 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:26:39,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [967109288] [2021-05-06 11:26:39,501 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [967109288] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:26:39,502 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:26:39,502 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:26:39,502 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1134269999] [2021-05-06 11:26:39,502 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:26:39,502 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:26:39,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:26:39,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=238, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:26:39,502 INFO L87 Difference]: Start difference. First operand 5224 states and 6254 transitions. Second operand has 17 states, 17 states have (on average 3.411764705882353) internal successors, (58), 16 states have internal predecessors, (58), 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) [2021-05-06 11:26:44,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:26:44,118 INFO L93 Difference]: Finished difference Result 5762 states and 6876 transitions. [2021-05-06 11:26:44,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 11:26:44,118 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.411764705882353) internal successors, (58), 16 states have internal predecessors, (58), 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 102 [2021-05-06 11:26:44,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:26:44,122 INFO L225 Difference]: With dead ends: 5762 [2021-05-06 11:26:44,122 INFO L226 Difference]: Without dead ends: 5486 [2021-05-06 11:26:44,123 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 914.8ms TimeCoverageRelationStatistics Valid=100, Invalid=712, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:26:44,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5486 states. [2021-05-06 11:26:47,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5486 to 5191. [2021-05-06 11:26:47,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5191 states, 5186 states have (on average 1.1988044735827228) internal successors, (6217), 5186 states have internal predecessors, (6217), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:47,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5191 states to 5191 states and 6221 transitions. [2021-05-06 11:26:47,779 INFO L78 Accepts]: Start accepts. Automaton has 5191 states and 6221 transitions. Word has length 102 [2021-05-06 11:26:47,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:26:47,780 INFO L480 AbstractCegarLoop]: Abstraction has 5191 states and 6221 transitions. [2021-05-06 11:26:47,780 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 3.411764705882353) internal successors, (58), 16 states have internal predecessors, (58), 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) [2021-05-06 11:26:47,780 INFO L276 IsEmpty]: Start isEmpty. Operand 5191 states and 6221 transitions. [2021-05-06 11:26:47,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:26:47,783 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:26:47,783 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 6, 6, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:26:47,783 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82 [2021-05-06 11:26:47,783 INFO L428 AbstractCegarLoop]: === Iteration 84 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:26:47,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:26:47,783 INFO L82 PathProgramCache]: Analyzing trace with hash 362240200, now seen corresponding path program 50 times [2021-05-06 11:26:47,783 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:26:47,783 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1651962530] [2021-05-06 11:26:47,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:26:47,786 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:26:47,786 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:26:47,787 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:26:47,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:48,028 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 37 [2021-05-06 11:26:48,580 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:26:48,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:48,582 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:26:48,582 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:26:48,583 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1651962530] [2021-05-06 11:26:48,583 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1651962530] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:26:48,583 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:26:48,583 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:26:48,583 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794590052] [2021-05-06 11:26:48,583 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:26:48,583 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:26:48,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:26:48,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:26:48,583 INFO L87 Difference]: Start difference. First operand 5191 states and 6221 transitions. Second operand has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 17 states have internal predecessors, (59), 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) [2021-05-06 11:26:53,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:26:53,289 INFO L93 Difference]: Finished difference Result 5595 states and 6699 transitions. [2021-05-06 11:26:53,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 11:26:53,289 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 17 states have internal predecessors, (59), 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 102 [2021-05-06 11:26:53,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:26:53,293 INFO L225 Difference]: With dead ends: 5595 [2021-05-06 11:26:53,293 INFO L226 Difference]: Without dead ends: 5346 [2021-05-06 11:26:53,294 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 1118.5ms TimeCoverageRelationStatistics Valid=106, Invalid=824, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:26:53,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5346 states. [2021-05-06 11:26:56,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5346 to 5101. [2021-05-06 11:26:56,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5101 states, 5096 states have (on average 1.2013343799058085) internal successors, (6122), 5096 states have internal predecessors, (6122), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:56,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5101 states to 5101 states and 6126 transitions. [2021-05-06 11:26:56,965 INFO L78 Accepts]: Start accepts. Automaton has 5101 states and 6126 transitions. Word has length 102 [2021-05-06 11:26:56,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:26:56,965 INFO L480 AbstractCegarLoop]: Abstraction has 5101 states and 6126 transitions. [2021-05-06 11:26:56,965 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 17 states have internal predecessors, (59), 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) [2021-05-06 11:26:56,965 INFO L276 IsEmpty]: Start isEmpty. Operand 5101 states and 6126 transitions. [2021-05-06 11:26:56,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:26:56,968 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:26:56,968 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 7, 6, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:26:56,968 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83 [2021-05-06 11:26:56,968 INFO L428 AbstractCegarLoop]: === Iteration 85 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:26:56,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:26:56,969 INFO L82 PathProgramCache]: Analyzing trace with hash -30786810, now seen corresponding path program 51 times [2021-05-06 11:26:56,969 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:26:56,969 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [47958235] [2021-05-06 11:26:56,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:26:56,972 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:26:56,972 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:26:56,973 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:26:57,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:57,691 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 43 [2021-05-06 11:26:57,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:26:57,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:57,856 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:26:57,856 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:26:57,856 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [47958235] [2021-05-06 11:26:57,856 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [47958235] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:26:57,857 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:26:57,857 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:26:57,857 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073407991] [2021-05-06 11:26:57,857 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:26:57,857 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:26:57,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:26:57,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:26:57,857 INFO L87 Difference]: Start difference. First operand 5101 states and 6126 transitions. Second operand has 13 states, 13 states have (on average 3.1538461538461537) internal successors, (41), 12 states have internal predecessors, (41), 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) [2021-05-06 11:27:03,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:27:03,182 INFO L93 Difference]: Finished difference Result 7046 states and 8444 transitions. [2021-05-06 11:27:03,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 11:27:03,182 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.1538461538461537) internal successors, (41), 12 states have internal predecessors, (41), 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 102 [2021-05-06 11:27:03,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:27:03,187 INFO L225 Difference]: With dead ends: 7046 [2021-05-06 11:27:03,188 INFO L226 Difference]: Without dead ends: 6667 [2021-05-06 11:27:03,189 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 13 SyntacticMatches, 7 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 785.3ms TimeCoverageRelationStatistics Valid=102, Invalid=318, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:27:03,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6667 states. [2021-05-06 11:27:07,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6667 to 5666. [2021-05-06 11:27:07,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5666 states, 5661 states have (on average 1.2017311429076134) internal successors, (6803), 5661 states have internal predecessors, (6803), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:27:07,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5666 states to 5666 states and 6807 transitions. [2021-05-06 11:27:07,267 INFO L78 Accepts]: Start accepts. Automaton has 5666 states and 6807 transitions. Word has length 102 [2021-05-06 11:27:07,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:27:07,267 INFO L480 AbstractCegarLoop]: Abstraction has 5666 states and 6807 transitions. [2021-05-06 11:27:07,267 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.1538461538461537) internal successors, (41), 12 states have internal predecessors, (41), 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) [2021-05-06 11:27:07,267 INFO L276 IsEmpty]: Start isEmpty. Operand 5666 states and 6807 transitions. [2021-05-06 11:27:07,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:27:07,271 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:27:07,271 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 7, 6, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:27:07,271 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84 [2021-05-06 11:27:07,271 INFO L428 AbstractCegarLoop]: === Iteration 86 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:27:07,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:27:07,272 INFO L82 PathProgramCache]: Analyzing trace with hash -1687964094, now seen corresponding path program 52 times [2021-05-06 11:27:07,272 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:27:07,272 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [647282804] [2021-05-06 11:27:07,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:27:07,275 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:27:07,275 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:27:07,276 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:27:07,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:27:08,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:27:08,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:27:08,695 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:27:08,695 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:27:08,695 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [647282804] [2021-05-06 11:27:08,695 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [647282804] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:27:08,695 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:27:08,695 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 11:27:08,696 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13151209] [2021-05-06 11:27:08,696 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 11:27:08,696 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:27:08,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 11:27:08,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:27:08,696 INFO L87 Difference]: Start difference. First operand 5666 states and 6807 transitions. Second operand has 19 states, 19 states have (on average 3.210526315789474) internal successors, (61), 18 states have internal predecessors, (61), 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) [2021-05-06 11:27:14,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:27:14,636 INFO L93 Difference]: Finished difference Result 6986 states and 8373 transitions. [2021-05-06 11:27:14,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 11:27:14,637 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.210526315789474) internal successors, (61), 18 states have internal predecessors, (61), 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 102 [2021-05-06 11:27:14,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:27:14,643 INFO L225 Difference]: With dead ends: 6986 [2021-05-06 11:27:14,643 INFO L226 Difference]: Without dead ends: 6652 [2021-05-06 11:27:14,646 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 14 SyntacticMatches, 7 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 177 ImplicationChecksByTransitivity, 1343.8ms TimeCoverageRelationStatistics Valid=165, Invalid=827, Unknown=0, NotChecked=0, Total=992 [2021-05-06 11:27:14,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6652 states. [2021-05-06 11:27:18,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6652 to 5777. [2021-05-06 11:27:18,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5777 states, 5772 states have (on average 1.198891198891199) internal successors, (6920), 5772 states have internal predecessors, (6920), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:27:18,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5777 states to 5777 states and 6924 transitions. [2021-05-06 11:27:18,864 INFO L78 Accepts]: Start accepts. Automaton has 5777 states and 6924 transitions. Word has length 102 [2021-05-06 11:27:18,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:27:18,864 INFO L480 AbstractCegarLoop]: Abstraction has 5777 states and 6924 transitions. [2021-05-06 11:27:18,864 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.210526315789474) internal successors, (61), 18 states have internal predecessors, (61), 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) [2021-05-06 11:27:18,864 INFO L276 IsEmpty]: Start isEmpty. Operand 5777 states and 6924 transitions. [2021-05-06 11:27:18,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:27:18,868 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:27:18,868 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 7, 6, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:27:18,868 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable85 [2021-05-06 11:27:18,868 INFO L428 AbstractCegarLoop]: === Iteration 87 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:27:18,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:27:18,868 INFO L82 PathProgramCache]: Analyzing trace with hash -1881743098, now seen corresponding path program 53 times [2021-05-06 11:27:18,868 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:27:18,868 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1999531613] [2021-05-06 11:27:18,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:27:18,872 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:27:18,872 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:27:18,872 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:27:18,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:27:20,282 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:27:20,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:27:20,285 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:27:20,285 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:27:20,285 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1999531613] [2021-05-06 11:27:20,285 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1999531613] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:27:20,285 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:27:20,285 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 11:27:20,285 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229495925] [2021-05-06 11:27:20,286 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 11:27:20,286 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:27:20,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 11:27:20,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=321, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:27:20,286 INFO L87 Difference]: Start difference. First operand 5777 states and 6924 transitions. Second operand has 20 states, 20 states have (on average 3.1) internal successors, (62), 19 states have internal predecessors, (62), 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) [2021-05-06 11:27:26,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:27:26,263 INFO L93 Difference]: Finished difference Result 6995 states and 8382 transitions. [2021-05-06 11:27:26,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 11:27:26,264 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.1) internal successors, (62), 19 states have internal predecessors, (62), 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 102 [2021-05-06 11:27:26,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:27:26,269 INFO L225 Difference]: With dead ends: 6995 [2021-05-06 11:27:26,269 INFO L226 Difference]: Without dead ends: 6664 [2021-05-06 11:27:26,271 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 14 SyntacticMatches, 6 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 1370.9ms TimeCoverageRelationStatistics Valid=178, Invalid=944, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 11:27:26,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6664 states. [2021-05-06 11:27:30,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6664 to 5666. [2021-05-06 11:27:30,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5666 states, 5661 states have (on average 1.2017311429076134) internal successors, (6803), 5661 states have internal predecessors, (6803), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:27:30,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5666 states to 5666 states and 6807 transitions. [2021-05-06 11:27:30,446 INFO L78 Accepts]: Start accepts. Automaton has 5666 states and 6807 transitions. Word has length 102 [2021-05-06 11:27:30,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:27:30,447 INFO L480 AbstractCegarLoop]: Abstraction has 5666 states and 6807 transitions. [2021-05-06 11:27:30,447 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 3.1) internal successors, (62), 19 states have internal predecessors, (62), 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) [2021-05-06 11:27:30,447 INFO L276 IsEmpty]: Start isEmpty. Operand 5666 states and 6807 transitions. [2021-05-06 11:27:30,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:27:30,450 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:27:30,450 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 8, 8, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:27:30,450 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86 [2021-05-06 11:27:30,450 INFO L428 AbstractCegarLoop]: === Iteration 88 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:27:30,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:27:30,450 INFO L82 PathProgramCache]: Analyzing trace with hash -1573170234, now seen corresponding path program 54 times [2021-05-06 11:27:30,450 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:27:30,450 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [539091549] [2021-05-06 11:27:30,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:27:30,456 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:27:30,456 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:27:30,457 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:27:30,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:27:31,582 WARN L205 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 141 DAG size of output: 55 [2021-05-06 11:27:31,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:27:31,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:27:31,728 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:27:31,728 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:27:31,728 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [539091549] [2021-05-06 11:27:31,728 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [539091549] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:27:31,728 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:27:31,728 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:27:31,728 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213978026] [2021-05-06 11:27:31,728 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:27:31,729 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:27:31,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:27:31,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:27:31,729 INFO L87 Difference]: Start difference. First operand 5666 states and 6807 transitions. Second operand has 16 states, 16 states have (on average 3.0) internal successors, (48), 15 states have internal predecessors, (48), 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) [2021-05-06 11:27:40,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:27:40,087 INFO L93 Difference]: Finished difference Result 11431 states and 13625 transitions. [2021-05-06 11:27:40,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:27:40,087 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.0) internal successors, (48), 15 states have internal predecessors, (48), 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 102 [2021-05-06 11:27:40,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:27:40,098 INFO L225 Difference]: With dead ends: 11431 [2021-05-06 11:27:40,098 INFO L226 Difference]: Without dead ends: 10511 [2021-05-06 11:27:40,102 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 5 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 993.1ms TimeCoverageRelationStatistics Valid=75, Invalid=231, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:27:40,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10511 states. [2021-05-06 11:27:47,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10511 to 9274. [2021-05-06 11:27:47,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9274 states, 9269 states have (on average 1.2028266263890388) internal successors, (11149), 9269 states have internal predecessors, (11149), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:27:47,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9274 states to 9274 states and 11153 transitions. [2021-05-06 11:27:47,086 INFO L78 Accepts]: Start accepts. Automaton has 9274 states and 11153 transitions. Word has length 102 [2021-05-06 11:27:47,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:27:47,086 INFO L480 AbstractCegarLoop]: Abstraction has 9274 states and 11153 transitions. [2021-05-06 11:27:47,086 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.0) internal successors, (48), 15 states have internal predecessors, (48), 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) [2021-05-06 11:27:47,086 INFO L276 IsEmpty]: Start isEmpty. Operand 9274 states and 11153 transitions. [2021-05-06 11:27:47,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:27:47,092 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:27:47,092 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 8, 8, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:27:47,092 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable87 [2021-05-06 11:27:47,092 INFO L428 AbstractCegarLoop]: === Iteration 89 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:27:47,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:27:47,093 INFO L82 PathProgramCache]: Analyzing trace with hash -1615238586, now seen corresponding path program 55 times [2021-05-06 11:27:47,093 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:27:47,093 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1779182731] [2021-05-06 11:27:47,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:27:47,096 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:27:47,096 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:27:47,097 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:27:47,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:27:47,850 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:27:47,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:27:47,852 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:27:47,853 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:27:47,853 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1779182731] [2021-05-06 11:27:47,853 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1779182731] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:27:47,853 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:27:47,853 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:27:47,853 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235035900] [2021-05-06 11:27:47,853 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:27:47,853 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:27:47,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:27:47,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:27:47,853 INFO L87 Difference]: Start difference. First operand 9274 states and 11153 transitions. Second operand has 11 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 10 states have internal predecessors, (38), 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) [2021-05-06 11:27:55,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:27:55,652 INFO L93 Difference]: Finished difference Result 10542 states and 12663 transitions. [2021-05-06 11:27:55,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:27:55,653 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 10 states have internal predecessors, (38), 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 102 [2021-05-06 11:27:55,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:27:55,664 INFO L225 Difference]: With dead ends: 10542 [2021-05-06 11:27:55,665 INFO L226 Difference]: Without dead ends: 10048 [2021-05-06 11:27:55,667 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 448.6ms TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:27:55,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10048 states. [2021-05-06 11:28:02,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10048 to 9268. [2021-05-06 11:28:02,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9268 states, 9263 states have (on average 1.201986397495412) internal successors, (11134), 9263 states have internal predecessors, (11134), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:28:02,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9268 states to 9268 states and 11138 transitions. [2021-05-06 11:28:02,567 INFO L78 Accepts]: Start accepts. Automaton has 9268 states and 11138 transitions. Word has length 102 [2021-05-06 11:28:02,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:28:02,567 INFO L480 AbstractCegarLoop]: Abstraction has 9268 states and 11138 transitions. [2021-05-06 11:28:02,568 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 10 states have internal predecessors, (38), 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) [2021-05-06 11:28:02,568 INFO L276 IsEmpty]: Start isEmpty. Operand 9268 states and 11138 transitions. [2021-05-06 11:28:02,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:28:02,573 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:28:02,573 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 8, 7, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:28:02,574 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable88 [2021-05-06 11:28:02,574 INFO L428 AbstractCegarLoop]: === Iteration 90 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:28:02,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:28:02,574 INFO L82 PathProgramCache]: Analyzing trace with hash -313195450, now seen corresponding path program 56 times [2021-05-06 11:28:02,574 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:28:02,574 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [464852173] [2021-05-06 11:28:02,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:28:02,577 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:28:02,577 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:28:02,578 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:28:02,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:28:03,584 WARN L205 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 60 [2021-05-06 11:28:03,728 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 116 DAG size of output: 35 [2021-05-06 11:28:03,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:28:03,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:28:03,777 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:28:03,777 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:28:03,777 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [464852173] [2021-05-06 11:28:03,777 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [464852173] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:28:03,777 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:28:03,778 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:28:03,778 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [848507362] [2021-05-06 11:28:03,778 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:28:03,778 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:28:03,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:28:03,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=182, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:28:03,778 INFO L87 Difference]: Start difference. First operand 9268 states and 11138 transitions. Second operand has 16 states, 16 states have (on average 3.0) internal successors, (48), 15 states have internal predecessors, (48), 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) [2021-05-06 11:28:12,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:28:12,146 INFO L93 Difference]: Finished difference Result 11250 states and 13369 transitions. [2021-05-06 11:28:12,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 11:28:12,146 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.0) internal successors, (48), 15 states have internal predecessors, (48), 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 102 [2021-05-06 11:28:12,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:28:12,157 INFO L225 Difference]: With dead ends: 11250 [2021-05-06 11:28:12,157 INFO L226 Difference]: Without dead ends: 10466 [2021-05-06 11:28:12,160 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 5 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 993.0ms TimeCoverageRelationStatistics Valid=78, Invalid=228, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:28:12,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10466 states. [2021-05-06 11:28:19,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10466 to 9268. [2021-05-06 11:28:19,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9268 states, 9263 states have (on average 1.1966965346000216) internal successors, (11085), 9263 states have internal predecessors, (11085), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:28:19,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9268 states to 9268 states and 11089 transitions. [2021-05-06 11:28:19,077 INFO L78 Accepts]: Start accepts. Automaton has 9268 states and 11089 transitions. Word has length 102 [2021-05-06 11:28:19,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:28:19,077 INFO L480 AbstractCegarLoop]: Abstraction has 9268 states and 11089 transitions. [2021-05-06 11:28:19,077 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.0) internal successors, (48), 15 states have internal predecessors, (48), 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) [2021-05-06 11:28:19,077 INFO L276 IsEmpty]: Start isEmpty. Operand 9268 states and 11089 transitions. [2021-05-06 11:28:19,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:28:19,083 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:28:19,083 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 7, 6, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:28:19,083 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable89 [2021-05-06 11:28:19,083 INFO L428 AbstractCegarLoop]: === Iteration 91 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:28:19,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:28:19,083 INFO L82 PathProgramCache]: Analyzing trace with hash -1192547638, now seen corresponding path program 57 times [2021-05-06 11:28:19,083 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:28:19,083 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1460437409] [2021-05-06 11:28:19,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:28:19,087 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:28:19,087 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:28:19,087 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:28:19,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:28:19,785 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:28:19,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:28:19,788 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:28:19,788 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:28:19,788 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1460437409] [2021-05-06 11:28:19,788 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1460437409] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:28:19,788 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:28:19,788 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:28:19,788 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1590154922] [2021-05-06 11:28:19,788 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:28:19,788 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:28:19,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:28:19,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:28:19,789 INFO L87 Difference]: Start difference. First operand 9268 states and 11089 transitions. Second operand has 11 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 10 states have internal predecessors, (38), 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) [2021-05-06 11:28:27,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:28:27,693 INFO L93 Difference]: Finished difference Result 11205 states and 13284 transitions. [2021-05-06 11:28:27,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:28:27,694 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 10 states have internal predecessors, (38), 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 102 [2021-05-06 11:28:27,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:28:27,704 INFO L225 Difference]: With dead ends: 11205 [2021-05-06 11:28:27,704 INFO L226 Difference]: Without dead ends: 9995 [2021-05-06 11:28:27,707 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 455.4ms TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:28:27,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9995 states. [2021-05-06 11:28:34,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9995 to 9205. [2021-05-06 11:28:34,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9205 states, 9200 states have (on average 1.1880434782608695) internal successors, (10930), 9200 states have internal predecessors, (10930), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:28:34,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9205 states to 9205 states and 10934 transitions. [2021-05-06 11:28:34,611 INFO L78 Accepts]: Start accepts. Automaton has 9205 states and 10934 transitions. Word has length 102 [2021-05-06 11:28:34,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:28:34,611 INFO L480 AbstractCegarLoop]: Abstraction has 9205 states and 10934 transitions. [2021-05-06 11:28:34,611 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 10 states have internal predecessors, (38), 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) [2021-05-06 11:28:34,611 INFO L276 IsEmpty]: Start isEmpty. Operand 9205 states and 10934 transitions. [2021-05-06 11:28:34,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:28:34,616 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:28:34,616 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 8, 8, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:28:34,616 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90 [2021-05-06 11:28:34,616 INFO L428 AbstractCegarLoop]: === Iteration 92 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:28:34,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:28:34,616 INFO L82 PathProgramCache]: Analyzing trace with hash 1517967882, now seen corresponding path program 58 times [2021-05-06 11:28:34,616 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:28:34,616 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1568405425] [2021-05-06 11:28:34,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:28:34,619 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:28:34,619 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:28:34,620 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:28:34,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:28:34,951 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 110 DAG size of output: 37 [2021-05-06 11:28:35,593 WARN L205 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 138 DAG size of output: 55 [2021-05-06 11:28:35,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:28:35,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:28:35,792 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:28:35,792 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:28:35,792 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1568405425] [2021-05-06 11:28:35,792 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1568405425] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:28:35,793 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:28:35,793 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:28:35,793 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108339802] [2021-05-06 11:28:35,793 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:28:35,793 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:28:35,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:28:35,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:28:35,793 INFO L87 Difference]: Start difference. First operand 9205 states and 10934 transitions. Second operand has 14 states, 14 states have (on average 3.142857142857143) internal successors, (44), 13 states have internal predecessors, (44), 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) [2021-05-06 11:28:43,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:28:43,604 INFO L93 Difference]: Finished difference Result 10425 states and 12386 transitions. [2021-05-06 11:28:43,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:28:43,604 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.142857142857143) internal successors, (44), 13 states have internal predecessors, (44), 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 102 [2021-05-06 11:28:43,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:28:43,612 INFO L225 Difference]: With dead ends: 10425 [2021-05-06 11:28:43,612 INFO L226 Difference]: Without dead ends: 9961 [2021-05-06 11:28:43,613 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 5 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 866.6ms TimeCoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:28:43,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9961 states. [2021-05-06 11:28:50,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9961 to 9181. [2021-05-06 11:28:50,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9181 states, 9176 states have (on average 1.1875544899738448) internal successors, (10897), 9176 states have internal predecessors, (10897), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:28:50,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9181 states to 9181 states and 10901 transitions. [2021-05-06 11:28:50,296 INFO L78 Accepts]: Start accepts. Automaton has 9181 states and 10901 transitions. Word has length 102 [2021-05-06 11:28:50,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:28:50,296 INFO L480 AbstractCegarLoop]: Abstraction has 9181 states and 10901 transitions. [2021-05-06 11:28:50,296 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.142857142857143) internal successors, (44), 13 states have internal predecessors, (44), 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) [2021-05-06 11:28:50,296 INFO L276 IsEmpty]: Start isEmpty. Operand 9181 states and 10901 transitions. [2021-05-06 11:28:50,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:28:50,302 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:28:50,302 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 8, 7, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:28:50,302 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91 [2021-05-06 11:28:50,302 INFO L428 AbstractCegarLoop]: === Iteration 93 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:28:50,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:28:50,302 INFO L82 PathProgramCache]: Analyzing trace with hash -587409014, now seen corresponding path program 59 times [2021-05-06 11:28:50,302 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:28:50,302 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [105660366] [2021-05-06 11:28:50,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:28:50,305 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:28:50,305 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:28:50,306 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:28:50,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:28:50,746 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 138 DAG size of output: 48 [2021-05-06 11:28:51,360 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 43 [2021-05-06 11:28:51,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:28:51,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:28:51,531 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:28:51,531 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:28:51,531 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [105660366] [2021-05-06 11:28:51,531 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [105660366] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:28:51,531 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:28:51,531 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:28:51,532 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [767167259] [2021-05-06 11:28:51,532 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:28:51,532 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:28:51,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:28:51,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:28:51,532 INFO L87 Difference]: Start difference. First operand 9181 states and 10901 transitions. Second operand has 16 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 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) [2021-05-06 11:28:59,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:28:59,930 INFO L93 Difference]: Finished difference Result 10628 states and 12561 transitions. [2021-05-06 11:28:59,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:28:59,930 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 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 102 [2021-05-06 11:28:59,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:28:59,938 INFO L225 Difference]: With dead ends: 10628 [2021-05-06 11:28:59,938 INFO L226 Difference]: Without dead ends: 9882 [2021-05-06 11:28:59,940 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 13 SyntacticMatches, 7 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 1153.4ms TimeCoverageRelationStatistics Valid=143, Invalid=559, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:28:59,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9882 states. [2021-05-06 11:29:06,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9882 to 8741. [2021-05-06 11:29:06,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8741 states, 8736 states have (on average 1.1854395604395604) internal successors, (10356), 8736 states have internal predecessors, (10356), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:29:06,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8741 states to 8741 states and 10360 transitions. [2021-05-06 11:29:06,380 INFO L78 Accepts]: Start accepts. Automaton has 8741 states and 10360 transitions. Word has length 102 [2021-05-06 11:29:06,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:29:06,380 INFO L480 AbstractCegarLoop]: Abstraction has 8741 states and 10360 transitions. [2021-05-06 11:29:06,380 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 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) [2021-05-06 11:29:06,380 INFO L276 IsEmpty]: Start isEmpty. Operand 8741 states and 10360 transitions. [2021-05-06 11:29:06,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:29:06,385 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:29:06,385 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 8, 7, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:29:06,385 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92 [2021-05-06 11:29:06,385 INFO L428 AbstractCegarLoop]: === Iteration 94 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:29:06,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:29:06,386 INFO L82 PathProgramCache]: Analyzing trace with hash 2050380998, now seen corresponding path program 60 times [2021-05-06 11:29:06,386 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:29:06,386 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1986501351] [2021-05-06 11:29:06,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:29:06,389 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:29:06,389 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:29:06,390 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:29:06,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:29:06,837 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 138 DAG size of output: 41 [2021-05-06 11:29:08,016 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:29:08,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:29:08,019 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:29:08,019 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:29:08,019 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1986501351] [2021-05-06 11:29:08,019 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1986501351] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:29:08,019 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:29:08,019 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 11:29:08,019 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618197212] [2021-05-06 11:29:08,020 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 11:29:08,020 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:29:08,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 11:29:08,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:29:08,020 INFO L87 Difference]: Start difference. First operand 8741 states and 10360 transitions. Second operand has 23 states, 23 states have (on average 2.869565217391304) internal successors, (66), 22 states have internal predecessors, (66), 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) [2021-05-06 11:29:16,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:29:16,542 INFO L93 Difference]: Finished difference Result 10143 states and 11975 transitions. [2021-05-06 11:29:16,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 11:29:16,543 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.869565217391304) internal successors, (66), 22 states have internal predecessors, (66), 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 102 [2021-05-06 11:29:16,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:29:16,551 INFO L225 Difference]: With dead ends: 10143 [2021-05-06 11:29:16,551 INFO L226 Difference]: Without dead ends: 9882 [2021-05-06 11:29:16,553 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 13 SyntacticMatches, 7 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 1719.0ms TimeCoverageRelationStatistics Valid=251, Invalid=1389, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 11:29:16,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9882 states. [2021-05-06 11:29:23,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9882 to 8924. [2021-05-06 11:29:23,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8924 states, 8919 states have (on average 1.1825316739544791) internal successors, (10547), 8919 states have internal predecessors, (10547), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:29:23,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8924 states to 8924 states and 10551 transitions. [2021-05-06 11:29:23,285 INFO L78 Accepts]: Start accepts. Automaton has 8924 states and 10551 transitions. Word has length 102 [2021-05-06 11:29:23,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:29:23,285 INFO L480 AbstractCegarLoop]: Abstraction has 8924 states and 10551 transitions. [2021-05-06 11:29:23,285 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.869565217391304) internal successors, (66), 22 states have internal predecessors, (66), 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) [2021-05-06 11:29:23,285 INFO L276 IsEmpty]: Start isEmpty. Operand 8924 states and 10551 transitions. [2021-05-06 11:29:23,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:29:23,289 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:29:23,289 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 8, 8, 8, 7, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:29:23,289 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable93 [2021-05-06 11:29:23,289 INFO L428 AbstractCegarLoop]: === Iteration 95 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:29:23,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:29:23,290 INFO L82 PathProgramCache]: Analyzing trace with hash 1856601994, now seen corresponding path program 61 times [2021-05-06 11:29:23,290 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:29:23,290 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [418703786] [2021-05-06 11:29:23,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:29:23,293 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:29:23,293 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:29:23,294 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:29:23,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:29:23,768 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 141 DAG size of output: 42 [2021-05-06 11:29:25,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:29:25,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:29:25,076 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:29:25,077 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:29:25,077 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [418703786] [2021-05-06 11:29:25,077 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [418703786] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:29:25,077 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:29:25,077 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 11:29:25,077 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861244443] [2021-05-06 11:29:25,077 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 11:29:25,077 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:29:25,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 11:29:25,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=436, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:29:25,077 INFO L87 Difference]: Start difference. First operand 8924 states and 10551 transitions. Second operand has 23 states, 23 states have (on average 2.9130434782608696) internal successors, (67), 22 states have internal predecessors, (67), 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) [2021-05-06 11:29:33,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:29:33,837 INFO L93 Difference]: Finished difference Result 10132 states and 11960 transitions. [2021-05-06 11:29:33,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 11:29:33,838 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.9130434782608696) internal successors, (67), 22 states have internal predecessors, (67), 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 102 [2021-05-06 11:29:33,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:29:33,844 INFO L225 Difference]: With dead ends: 10132 [2021-05-06 11:29:33,845 INFO L226 Difference]: Without dead ends: 9874 [2021-05-06 11:29:33,845 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 14 SyntacticMatches, 6 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 1866.0ms TimeCoverageRelationStatistics Valid=211, Invalid=1271, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 11:29:33,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9874 states. [2021-05-06 11:29:40,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9874 to 8825. [2021-05-06 11:29:40,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8825 states, 8820 states have (on average 1.1845804988662132) internal successors, (10448), 8820 states have internal predecessors, (10448), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:29:40,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8825 states to 8825 states and 10452 transitions. [2021-05-06 11:29:40,410 INFO L78 Accepts]: Start accepts. Automaton has 8825 states and 10452 transitions. Word has length 102 [2021-05-06 11:29:40,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:29:40,411 INFO L480 AbstractCegarLoop]: Abstraction has 8825 states and 10452 transitions. [2021-05-06 11:29:40,411 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.9130434782608696) internal successors, (67), 22 states have internal predecessors, (67), 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) [2021-05-06 11:29:40,411 INFO L276 IsEmpty]: Start isEmpty. Operand 8825 states and 10452 transitions. [2021-05-06 11:29:40,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:29:40,415 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:29:40,415 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 8, 8, 8, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:29:40,415 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable94 [2021-05-06 11:29:40,415 INFO L428 AbstractCegarLoop]: === Iteration 96 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:29:40,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:29:40,415 INFO L82 PathProgramCache]: Analyzing trace with hash 2075765518, now seen corresponding path program 1 times [2021-05-06 11:29:40,415 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:29:40,415 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1402035751] [2021-05-06 11:29:40,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:29:40,419 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:29:40,419 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:29:40,420 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:29:40,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:29:40,961 WARN L205 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 119 DAG size of output: 44 [2021-05-06 11:29:41,125 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 145 DAG size of output: 42 [2021-05-06 11:29:41,284 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 40 [2021-05-06 11:29:41,788 WARN L205 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 58 [2021-05-06 11:29:41,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:29:41,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:29:41,952 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:29:41,952 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:29:41,952 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1402035751] [2021-05-06 11:29:41,952 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1402035751] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:29:41,952 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:29:41,952 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:29:41,952 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445687503] [2021-05-06 11:29:41,952 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:29:41,952 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:29:41,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:29:41,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:29:41,953 INFO L87 Difference]: Start difference. First operand 8825 states and 10452 transitions. Second operand has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 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) [2021-05-06 11:29:50,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:29:50,886 INFO L93 Difference]: Finished difference Result 13955 states and 16368 transitions. [2021-05-06 11:29:50,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 11:29:50,887 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 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 102 [2021-05-06 11:29:50,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:29:50,896 INFO L225 Difference]: With dead ends: 13955 [2021-05-06 11:29:50,896 INFO L226 Difference]: Without dead ends: 10082 [2021-05-06 11:29:50,900 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 5 SyntacticMatches, 4 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 1636.9ms TimeCoverageRelationStatistics Valid=201, Invalid=669, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:29:50,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10082 states. [2021-05-06 11:29:57,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10082 to 8478. [2021-05-06 11:29:57,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8478 states, 8473 states have (on average 1.175262598843385) internal successors, (9958), 8473 states have internal predecessors, (9958), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:29:57,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8478 states to 8478 states and 9962 transitions. [2021-05-06 11:29:57,540 INFO L78 Accepts]: Start accepts. Automaton has 8478 states and 9962 transitions. Word has length 102 [2021-05-06 11:29:57,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:29:57,541 INFO L480 AbstractCegarLoop]: Abstraction has 8478 states and 9962 transitions. [2021-05-06 11:29:57,541 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 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) [2021-05-06 11:29:57,541 INFO L276 IsEmpty]: Start isEmpty. Operand 8478 states and 9962 transitions. [2021-05-06 11:29:57,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:29:57,548 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:29:57,548 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 8, 8, 8, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:29:57,548 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95 [2021-05-06 11:29:57,548 INFO L428 AbstractCegarLoop]: === Iteration 97 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:29:57,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:29:57,549 INFO L82 PathProgramCache]: Analyzing trace with hash 418588234, now seen corresponding path program 2 times [2021-05-06 11:29:57,549 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:29:57,549 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [821160292] [2021-05-06 11:29:57,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:29:57,553 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:29:57,553 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:29:57,553 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:29:57,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-06 11:29:57,589 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-06 11:29:57,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-06 11:29:57,626 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-06 11:29:57,658 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2021-05-06 11:29:57,659 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-06 11:29:57,659 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable96 [2021-05-06 11:29:57,680 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 11:29:57 BoogieIcfgContainer [2021-05-06 11:29:57,680 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-06 11:29:57,681 INFO L168 Benchmark]: Toolchain (without parser) took 542324.58 ms. Allocated memory was 212.9 MB in the beginning and 2.0 GB in the end (delta: 1.8 GB). Free memory was 177.7 MB in the beginning and 1.2 GB in the end (delta: -1.0 GB). Peak memory consumption was 754.9 MB. Max. memory is 8.0 GB. [2021-05-06 11:29:57,681 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 212.9 MB. Free memory is still 194.6 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-06 11:29:57,681 INFO L168 Benchmark]: CACSL2BoogieTranslator took 287.84 ms. Allocated memory is still 212.9 MB. Free memory was 177.5 MB in the beginning and 195.3 MB in the end (delta: -17.8 MB). Peak memory consumption was 11.7 MB. Max. memory is 8.0 GB. [2021-05-06 11:29:57,681 INFO L168 Benchmark]: Boogie Preprocessor took 56.29 ms. Allocated memory is still 212.9 MB. Free memory was 195.3 MB in the beginning and 193.5 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-06 11:29:57,681 INFO L168 Benchmark]: RCFGBuilder took 472.86 ms. Allocated memory is still 212.9 MB. Free memory was 193.5 MB in the beginning and 174.7 MB in the end (delta: 18.9 MB). Peak memory consumption was 18.9 MB. Max. memory is 8.0 GB. [2021-05-06 11:29:57,682 INFO L168 Benchmark]: TraceAbstraction took 541501.44 ms. Allocated memory was 212.9 MB in the beginning and 2.0 GB in the end (delta: 1.8 GB). Free memory was 174.0 MB in the beginning and 1.2 GB in the end (delta: -1.0 GB). Peak memory consumption was 751.7 MB. Max. memory is 8.0 GB. [2021-05-06 11:29:57,682 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 212.9 MB. Free memory is still 194.6 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 287.84 ms. Allocated memory is still 212.9 MB. Free memory was 177.5 MB in the beginning and 195.3 MB in the end (delta: -17.8 MB). Peak memory consumption was 11.7 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 56.29 ms. Allocated memory is still 212.9 MB. Free memory was 195.3 MB in the beginning and 193.5 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 472.86 ms. Allocated memory is still 212.9 MB. Free memory was 193.5 MB in the beginning and 174.7 MB in the end (delta: 18.9 MB). Peak memory consumption was 18.9 MB. Max. memory is 8.0 GB. * TraceAbstraction took 541501.44 ms. Allocated memory was 212.9 MB in the beginning and 2.0 GB in the end (delta: 1.8 GB). Free memory was 174.0 MB in the beginning and 1.2 GB in the end (delta: -1.0 GB). Peak memory consumption was 751.7 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L26] char string_entrada[10], vetor_vogais[]={'a','A','e','E','i','I','o','O','u','U','\0'}; [L27] unsigned int i,j,cont, tam_string, n_caracter; [L29] i=0 [L29] COND TRUE i<10 [L30] string_entrada[i] = __VERIFIER_nondet_char() [L29] i++ [L29] COND TRUE i<10 [L30] string_entrada[i] = __VERIFIER_nondet_char() [L29] i++ [L29] COND TRUE i<10 [L30] string_entrada[i] = __VERIFIER_nondet_char() [L29] i++ [L29] COND TRUE i<10 [L30] string_entrada[i] = __VERIFIER_nondet_char() [L29] i++ [L29] COND TRUE i<10 [L30] string_entrada[i] = __VERIFIER_nondet_char() [L29] i++ [L29] COND TRUE i<10 [L30] string_entrada[i] = __VERIFIER_nondet_char() [L29] i++ [L29] COND TRUE i<10 [L30] string_entrada[i] = __VERIFIER_nondet_char() [L29] i++ [L29] COND TRUE i<10 [L30] string_entrada[i] = __VERIFIER_nondet_char() [L29] i++ [L29] COND TRUE i<10 [L30] string_entrada[i] = __VERIFIER_nondet_char() [L29] i++ [L29] COND TRUE i<10 [L30] string_entrada[i] = __VERIFIER_nondet_char() [L29] i++ [L29] COND FALSE !(i<10) [L32] string_entrada[10 -1]='\0' [L34] n_caracter = 0 [L35] EXPR string_entrada[n_caracter] [L35] COND TRUE string_entrada[n_caracter]!='\0' [L36] n_caracter++ [L35] EXPR string_entrada[n_caracter] [L35] COND FALSE !(string_entrada[n_caracter]!='\0') [L38] cont = 0 [L39] i=0 [L39] COND TRUE i