/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-crafted-1/mono-crafted_9.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 11:57:25,906 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 11:57:25,908 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 11:57:25,948 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 11:57:25,986 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 11:57:25,987 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 11:57:25,987 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 11:57:25,988 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 11:57:26,003 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 11:57:26,003 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 11:57:26,006 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 11:57:26,006 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 11:57:26,006 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 11:57:26,006 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 11:57:26,006 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 11:57:26,007 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 11:57:26,007 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 11:57:26,007 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 11:57:26,008 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 11:57:26,008 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 11:57:26,008 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 11:57:26,008 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 11:57:26,008 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 11:57:26,008 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 11:57:26,009 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 11:57:26,009 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 11:57:26,009 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:57:26,009 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 11:57:26,009 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 11:57:26,009 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 11:57:26,009 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 11:57:26,010 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 11:57:26,297 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 11:57:26,324 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 11:57:26,327 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 11:57:26,328 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 11:57:26,329 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 11:57:26,329 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_9.c [2021-05-06 11:57:26,382 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4b565e12b/828bb84406a2442eb2d5856e10a3f9b5/FLAG39241eee8 [2021-05-06 11:57:26,799 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 11:57:26,799 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_9.c [2021-05-06 11:57:26,804 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4b565e12b/828bb84406a2442eb2d5856e10a3f9b5/FLAG39241eee8 [2021-05-06 11:57:26,822 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4b565e12b/828bb84406a2442eb2d5856e10a3f9b5 [2021-05-06 11:57:26,825 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 11:57:26,827 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 11:57:26,829 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 11:57:26,829 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 11:57:26,832 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 11:57:26,833 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:57:26" (1/1) ... [2021-05-06 11:57:26,835 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@25458f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:57:26, skipping insertion in model container [2021-05-06 11:57:26,835 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:57:26" (1/1) ... [2021-05-06 11:57:26,841 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 11:57:26,857 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 11:57:26,998 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-crafted-1/mono-crafted_9.c[318,331] [2021-05-06 11:57:27,005 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:57:27,015 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 11:57:27,050 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-crafted-1/mono-crafted_9.c[318,331] [2021-05-06 11:57:27,052 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:57:27,079 INFO L208 MainTranslator]: Completed translation [2021-05-06 11:57:27,079 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:57:27 WrapperNode [2021-05-06 11:57:27,079 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 11:57:27,080 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 11:57:27,081 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 11:57:27,081 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 11:57:27,089 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:57:27" (1/1) ... [2021-05-06 11:57:27,089 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:57:27" (1/1) ... [2021-05-06 11:57:27,094 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:57:27" (1/1) ... [2021-05-06 11:57:27,094 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:57:27" (1/1) ... [2021-05-06 11:57:27,097 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:57:27" (1/1) ... [2021-05-06 11:57:27,099 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:57:27" (1/1) ... [2021-05-06 11:57:27,100 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:57:27" (1/1) ... [2021-05-06 11:57:27,101 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 11:57:27,102 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 11:57:27,102 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 11:57:27,102 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 11:57:27,103 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:57:27" (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 11:57:27,169 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 11:57:27,170 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 11:57:27,170 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 11:57:27,170 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 11:57:27,170 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 11:57:27,170 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 11:57:27,170 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 11:57:27,170 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 11:57:27,170 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 11:57:27,170 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 11:57:27,171 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 11:57:27,171 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 11:57:27,171 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 11:57:27,171 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 11:57:27,171 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 11:57:27,171 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 11:57:27,171 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 11:57:27,373 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 11:57:27,373 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 11:57:27,374 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:57:27 BoogieIcfgContainer [2021-05-06 11:57:27,374 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 11:57:27,376 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 11:57:27,376 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 11:57:27,378 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 11:57:27,379 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 11:57:26" (1/3) ... [2021-05-06 11:57:27,379 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@443121d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:57:27, skipping insertion in model container [2021-05-06 11:57:27,379 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:57:27" (2/3) ... [2021-05-06 11:57:27,380 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@443121d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:57:27, skipping insertion in model container [2021-05-06 11:57:27,380 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:57:27" (3/3) ... [2021-05-06 11:57:27,381 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_9.c [2021-05-06 11:57:27,386 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 11:57:27,390 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 11:57:27,404 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 11:57:27,421 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 11:57:27,421 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 11:57:27,421 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 11:57:27,421 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 11:57:27,421 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 11:57:27,421 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 11:57:27,421 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 11:57:27,422 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 11:57:27,433 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:57:27,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 11:57:27,439 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:27,439 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:27,439 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:27,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:27,444 INFO L82 PathProgramCache]: Analyzing trace with hash 1325153485, now seen corresponding path program 1 times [2021-05-06 11:57:27,450 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:27,451 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [312593750] [2021-05-06 11:57:27,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:27,512 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:57:27,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:27,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:27,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:27,689 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 11:57:27,691 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:27,691 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [312593750] [2021-05-06 11:57:27,692 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [312593750] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:27,693 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:27,693 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 11:57:27,693 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638637688] [2021-05-06 11:57:27,696 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 11:57:27,697 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:27,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 11:57:27,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:57:27,717 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:27,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:27,805 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2021-05-06 11:57:27,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 11:57:27,806 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-06 11:57:27,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:27,811 INFO L225 Difference]: With dead ends: 32 [2021-05-06 11:57:27,811 INFO L226 Difference]: Without dead ends: 13 [2021-05-06 11:57:27,816 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 31.8ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:57:27,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-05-06 11:57:27,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-05-06 11:57:27,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 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 11:57:27,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-05-06 11:57:27,851 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2021-05-06 11:57:27,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:27,852 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-05-06 11:57:27,852 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:27,852 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-05-06 11:57:27,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 11:57:27,853 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:27,853 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:27,854 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 11:57:27,855 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:27,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:27,858 INFO L82 PathProgramCache]: Analyzing trace with hash 1315918275, now seen corresponding path program 1 times [2021-05-06 11:57:27,858 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:27,859 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [16784788] [2021-05-06 11:57:27,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:27,870 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:57:27,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:27,973 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:27,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:28,010 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 11:57:28,010 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:28,011 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [16784788] [2021-05-06 11:57:28,011 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [16784788] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:28,011 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:28,011 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 11:57:28,011 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262587953] [2021-05-06 11:57:28,012 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 11:57:28,012 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:28,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 11:57:28,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 11:57:28,013 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:28,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:28,084 INFO L93 Difference]: Finished difference Result 22 states and 26 transitions. [2021-05-06 11:57:28,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 11:57:28,085 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-06 11:57:28,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:28,086 INFO L225 Difference]: With dead ends: 22 [2021-05-06 11:57:28,086 INFO L226 Difference]: Without dead ends: 15 [2021-05-06 11:57:28,087 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 55.3ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:57:28,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-06 11:57:28,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-05-06 11:57:28,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 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 11:57:28,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-05-06 11:57:28,104 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2021-05-06 11:57:28,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:28,104 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-05-06 11:57:28,104 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:28,104 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-05-06 11:57:28,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-06 11:57:28,105 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:28,105 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:28,106 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 11:57:28,107 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:28,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:28,107 INFO L82 PathProgramCache]: Analyzing trace with hash -1372110560, now seen corresponding path program 1 times [2021-05-06 11:57:28,107 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:28,108 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1088109900] [2021-05-06 11:57:28,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:28,161 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:57:28,165 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:28,182 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:28,203 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:57:28,216 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:28,220 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:57:28,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:28,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:28,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:28,324 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 11:57:28,380 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:28,380 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1088109900] [2021-05-06 11:57:28,383 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1088109900] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:28,383 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:28,383 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 11:57:28,383 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796933110] [2021-05-06 11:57:28,384 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 11:57:28,384 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:28,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 11:57:28,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:57:28,385 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:28,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:28,499 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2021-05-06 11:57:28,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 11:57:28,499 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-05-06 11:57:28,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:28,500 INFO L225 Difference]: With dead ends: 22 [2021-05-06 11:57:28,500 INFO L226 Difference]: Without dead ends: 17 [2021-05-06 11:57:28,501 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 132.1ms TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:57:28,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-06 11:57:28,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-06 11:57:28,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 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 11:57:28,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-05-06 11:57:28,509 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 13 [2021-05-06 11:57:28,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:28,509 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-05-06 11:57:28,509 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:28,509 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-05-06 11:57:28,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-06 11:57:28,510 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:28,510 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:28,510 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 11:57:28,510 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:28,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:28,520 INFO L82 PathProgramCache]: Analyzing trace with hash 1059749499, now seen corresponding path program 1 times [2021-05-06 11:57:28,520 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:28,520 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1802183342] [2021-05-06 11:57:28,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:28,531 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:57:28,540 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:28,546 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:28,554 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:57:28,562 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:28,565 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:57:28,572 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:57:28,574 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:28,579 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:28,590 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:57:28,597 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:28,609 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:28,632 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:28,645 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:28,663 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:28,667 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:28,680 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:28,696 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:28,700 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:28,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:28,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:28,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:28,878 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 11:57:28,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:28,992 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:28,992 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1802183342] [2021-05-06 11:57:28,994 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1802183342] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:28,994 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:28,994 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:57:28,994 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2093465069] [2021-05-06 11:57:28,995 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:57:28,996 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:28,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:57:28,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:57:28,997 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:29,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:29,288 INFO L93 Difference]: Finished difference Result 31 states and 38 transitions. [2021-05-06 11:57:29,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:57:29,289 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-06 11:57:29,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:29,291 INFO L225 Difference]: With dead ends: 31 [2021-05-06 11:57:29,291 INFO L226 Difference]: Without dead ends: 21 [2021-05-06 11:57:29,292 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 314.1ms TimeCoverageRelationStatistics Valid=69, Invalid=237, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:57:29,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-06 11:57:29,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-05-06 11:57:29,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.25) internal successors, (20), 16 states have internal predecessors, (20), 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 11:57:29,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2021-05-06 11:57:29,299 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 15 [2021-05-06 11:57:29,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:29,300 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2021-05-06 11:57:29,300 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:29,300 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2021-05-06 11:57:29,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-06 11:57:29,301 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:29,301 INFO L523 BasicCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:29,301 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-06 11:57:29,301 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:29,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:29,302 INFO L82 PathProgramCache]: Analyzing trace with hash -1662437453, now seen corresponding path program 2 times [2021-05-06 11:57:29,302 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:29,303 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [134801022] [2021-05-06 11:57:29,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:29,326 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:29,330 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:29,337 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:29,349 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:29,352 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:29,378 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:29,395 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:29,405 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:57:29,420 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:29,427 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:29,433 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:57:29,446 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:29,448 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:29,456 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:57:29,465 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:29,473 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:29,484 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:57:29,492 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:29,503 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:29,506 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:29,513 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:29,530 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:29,537 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:29,571 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:29,587 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:29,589 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:29,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:29,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:29,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:29,752 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 11:57:29,755 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:29,868 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:29,869 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [134801022] [2021-05-06 11:57:29,869 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [134801022] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:29,869 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:29,869 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:57:29,869 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775473028] [2021-05-06 11:57:29,869 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:57:29,870 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:29,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:57:29,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:57:29,870 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 10 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 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 11:57:30,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:30,166 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2021-05-06 11:57:30,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:57:30,167 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 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 11:57:30,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:30,168 INFO L225 Difference]: With dead ends: 30 [2021-05-06 11:57:30,168 INFO L226 Difference]: Without dead ends: 23 [2021-05-06 11:57:30,169 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 336.8ms TimeCoverageRelationStatistics Valid=70, Invalid=236, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:57:30,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-06 11:57:30,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-06 11:57:30,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 18 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:30,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2021-05-06 11:57:30,199 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 19 [2021-05-06 11:57:30,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:30,204 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2021-05-06 11:57:30,204 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 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 11:57:30,204 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2021-05-06 11:57:30,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-06 11:57:30,209 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:30,209 INFO L523 BasicCegarLoop]: trace histogram [5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:30,209 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-06 11:57:30,209 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:30,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:30,210 INFO L82 PathProgramCache]: Analyzing trace with hash 361874638, now seen corresponding path program 3 times [2021-05-06 11:57:30,210 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:30,210 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [405851679] [2021-05-06 11:57:30,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:30,257 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:30,260 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:30,265 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:30,278 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:30,281 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:30,325 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:30,340 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:30,357 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:57:30,364 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:30,369 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:30,375 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:57:30,382 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:30,384 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:30,399 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:57:30,401 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:30,409 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:30,421 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:57:30,429 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:30,449 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:30,469 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:30,476 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:30,493 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:30,496 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:30,507 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:30,522 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:30,524 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:30,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:30,616 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:30,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:30,626 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 11:57:30,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:30,769 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:30,770 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [405851679] [2021-05-06 11:57:30,770 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [405851679] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:30,770 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:30,770 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:57:30,770 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227448310] [2021-05-06 11:57:30,770 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:57:30,770 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:30,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:57:30,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:57:30,771 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 11 states, 10 states have (on average 1.7) internal successors, (17), 9 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 11:57:31,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:31,136 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2021-05-06 11:57:31,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:57:31,137 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.7) internal successors, (17), 9 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 11:57:31,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:31,137 INFO L225 Difference]: With dead ends: 32 [2021-05-06 11:57:31,137 INFO L226 Difference]: Without dead ends: 25 [2021-05-06 11:57:31,138 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 389.1ms TimeCoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:57:31,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-06 11:57:31,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-05-06 11:57:31,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.2) internal successors, (24), 20 states have internal predecessors, (24), 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 11:57:31,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-05-06 11:57:31,142 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 21 [2021-05-06 11:57:31,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:31,142 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-05-06 11:57:31,143 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 1.7) internal successors, (17), 9 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 11:57:31,143 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-05-06 11:57:31,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-06 11:57:31,143 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:31,143 INFO L523 BasicCegarLoop]: trace histogram [6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:31,143 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-05-06 11:57:31,144 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:31,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:31,144 INFO L82 PathProgramCache]: Analyzing trace with hash 105609001, now seen corresponding path program 4 times [2021-05-06 11:57:31,144 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:31,144 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1677839689] [2021-05-06 11:57:31,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:31,154 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:31,156 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:31,158 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:31,168 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:31,171 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:31,190 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:31,205 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:31,209 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:57:31,221 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:31,228 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:31,234 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:57:31,242 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:31,243 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:31,247 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:57:31,254 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:31,260 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:31,269 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:57:31,280 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:31,292 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:31,300 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:31,305 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:31,319 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:31,321 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:31,339 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:31,354 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:31,355 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:31,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:31,463 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:31,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:31,469 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 11:57:31,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:31,605 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:31,605 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1677839689] [2021-05-06 11:57:31,605 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1677839689] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:31,605 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:31,606 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 11:57:31,606 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541992441] [2021-05-06 11:57:31,606 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 11:57:31,606 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:31,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 11:57:31,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:57:31,607 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 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 11:57:31,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:31,966 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2021-05-06 11:57:31,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 11:57:31,966 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 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 11:57:31,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:31,967 INFO L225 Difference]: With dead ends: 34 [2021-05-06 11:57:31,967 INFO L226 Difference]: Without dead ends: 27 [2021-05-06 11:57:31,967 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 378.0ms TimeCoverageRelationStatistics Valid=92, Invalid=370, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:57:31,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-06 11:57:31,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-05-06 11:57:31,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 22 states have internal predecessors, (26), 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 11:57:31,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2021-05-06 11:57:31,972 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 23 [2021-05-06 11:57:31,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:31,973 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2021-05-06 11:57:31,973 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 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 11:57:31,973 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2021-05-06 11:57:31,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-06 11:57:31,973 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:31,973 INFO L523 BasicCegarLoop]: trace histogram [7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:31,974 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-06 11:57:31,974 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:31,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:31,974 INFO L82 PathProgramCache]: Analyzing trace with hash -1352532284, now seen corresponding path program 5 times [2021-05-06 11:57:31,974 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:31,974 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1340682683] [2021-05-06 11:57:31,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:31,983 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:31,984 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:31,986 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:31,997 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:31,999 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:32,019 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:32,034 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:32,042 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:57:32,048 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:32,052 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:32,058 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:57:32,065 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:32,066 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:32,070 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:57:32,075 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:32,080 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:32,084 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:57:32,092 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:32,098 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:32,111 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:32,113 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:32,122 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:32,124 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:32,134 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:32,148 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:32,150 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:32,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:32,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:32,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:32,240 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 11:57:32,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:32,421 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:32,421 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1340682683] [2021-05-06 11:57:32,422 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1340682683] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:32,422 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:32,422 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:57:32,422 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681647985] [2021-05-06 11:57:32,422 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:57:32,422 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:32,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:57:32,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:57:32,423 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 13 states, 12 states have (on average 1.75) internal successors, (21), 11 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 11:57:32,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:32,805 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2021-05-06 11:57:32,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:57:32,805 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.75) internal successors, (21), 11 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 11:57:32,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:32,806 INFO L225 Difference]: With dead ends: 36 [2021-05-06 11:57:32,806 INFO L226 Difference]: Without dead ends: 29 [2021-05-06 11:57:32,807 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 433.2ms TimeCoverageRelationStatistics Valid=103, Invalid=449, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:57:32,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-06 11:57:32,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-05-06 11:57:32,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.1666666666666667) internal successors, (28), 24 states have internal predecessors, (28), 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 11:57:32,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2021-05-06 11:57:32,812 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 25 [2021-05-06 11:57:32,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:32,812 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2021-05-06 11:57:32,812 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 1.75) internal successors, (21), 11 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 11:57:32,812 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2021-05-06 11:57:32,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-06 11:57:32,813 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:32,813 INFO L523 BasicCegarLoop]: trace histogram [8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:32,813 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-05-06 11:57:32,813 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:32,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:32,813 INFO L82 PathProgramCache]: Analyzing trace with hash 1827998623, now seen corresponding path program 6 times [2021-05-06 11:57:32,814 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:32,814 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1976739287] [2021-05-06 11:57:32,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:32,822 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:32,823 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:32,826 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:32,836 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:32,838 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:32,858 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:32,872 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:32,876 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:57:32,882 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:32,886 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:32,891 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:57:32,898 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:32,899 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:32,902 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:57:32,907 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:32,911 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:32,916 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:57:32,923 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:32,928 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:32,929 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:32,931 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:32,940 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:32,943 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:32,962 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:32,976 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:32,977 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:32,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:33,055 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:33,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:33,059 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 11:57:33,061 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:33,250 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:33,250 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1976739287] [2021-05-06 11:57:33,251 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1976739287] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:33,251 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:33,251 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:57:33,251 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839831069] [2021-05-06 11:57:33,251 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:57:33,251 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:33,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:57:33,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:57:33,252 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand has 14 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 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 11:57:33,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:33,640 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2021-05-06 11:57:33,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 11:57:33,640 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 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 11:57:33,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:33,641 INFO L225 Difference]: With dead ends: 38 [2021-05-06 11:57:33,641 INFO L226 Difference]: Without dead ends: 31 [2021-05-06 11:57:33,641 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 442.7ms TimeCoverageRelationStatistics Valid=114, Invalid=536, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:57:33,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-06 11:57:33,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-05-06 11:57:33,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 26 states have internal predecessors, (30), 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 11:57:33,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2021-05-06 11:57:33,646 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 27 [2021-05-06 11:57:33,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:33,647 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2021-05-06 11:57:33,647 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 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 11:57:33,647 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2021-05-06 11:57:33,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-06 11:57:33,647 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:33,647 INFO L523 BasicCegarLoop]: trace histogram [9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:33,648 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-05-06 11:57:33,648 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:33,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:33,648 INFO L82 PathProgramCache]: Analyzing trace with hash 301485498, now seen corresponding path program 7 times [2021-05-06 11:57:33,648 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:33,648 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1783431938] [2021-05-06 11:57:33,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:33,662 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:33,664 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:33,665 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:33,675 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:33,677 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:33,696 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:33,710 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:33,714 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:57:33,715 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:33,719 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:33,744 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:57:33,751 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:33,752 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:33,755 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:57:33,763 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:33,768 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:33,773 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:57:33,781 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:33,786 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:33,799 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:33,802 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:33,817 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:33,819 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:33,828 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:33,843 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:33,844 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:33,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:33,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:33,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:33,941 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 11:57:33,943 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:34,146 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:34,146 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1783431938] [2021-05-06 11:57:34,146 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1783431938] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:34,147 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:34,147 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:57:34,147 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819079127] [2021-05-06 11:57:34,147 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:57:34,147 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:34,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:57:34,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:57:34,148 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand has 15 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 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 11:57:34,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:34,597 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2021-05-06 11:57:34,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:57:34,597 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 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 11:57:34,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:34,598 INFO L225 Difference]: With dead ends: 40 [2021-05-06 11:57:34,598 INFO L226 Difference]: Without dead ends: 33 [2021-05-06 11:57:34,599 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 527.6ms TimeCoverageRelationStatistics Valid=125, Invalid=631, Unknown=0, NotChecked=0, Total=756 [2021-05-06 11:57:34,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-06 11:57:34,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-05-06 11:57:34,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 28 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 11:57:34,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 36 transitions. [2021-05-06 11:57:34,604 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 36 transitions. Word has length 29 [2021-05-06 11:57:34,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:34,604 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 36 transitions. [2021-05-06 11:57:34,605 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 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 11:57:34,605 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 36 transitions. [2021-05-06 11:57:34,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-06 11:57:34,605 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:34,605 INFO L523 BasicCegarLoop]: trace histogram [10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:34,605 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-05-06 11:57:34,606 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:34,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:34,606 INFO L82 PathProgramCache]: Analyzing trace with hash -2093779691, now seen corresponding path program 8 times [2021-05-06 11:57:34,606 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:34,606 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1777980604] [2021-05-06 11:57:34,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:34,623 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:34,635 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:34,638 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:34,648 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:34,650 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:34,659 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:34,672 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:34,679 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:57:34,683 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:34,701 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:34,706 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:57:34,713 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:34,714 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:34,716 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:57:34,722 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:34,726 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:34,731 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:57:34,737 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:34,749 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:34,750 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:34,753 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:34,766 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:34,768 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:34,786 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:34,800 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:34,803 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:34,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:34,882 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:34,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:34,890 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 11:57:34,893 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:35,112 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:35,112 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1777980604] [2021-05-06 11:57:35,112 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1777980604] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:35,112 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:35,112 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:57:35,112 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285169402] [2021-05-06 11:57:35,112 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:57:35,112 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:35,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:57:35,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:57:35,113 INFO L87 Difference]: Start difference. First operand 33 states and 36 transitions. Second operand has 16 states, 15 states have (on average 1.8) internal successors, (27), 14 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 11:57:35,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:35,610 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2021-05-06 11:57:35,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 11:57:35,610 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.8) internal successors, (27), 14 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 11:57:35,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:35,611 INFO L225 Difference]: With dead ends: 42 [2021-05-06 11:57:35,611 INFO L226 Difference]: Without dead ends: 35 [2021-05-06 11:57:35,611 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 556.3ms TimeCoverageRelationStatistics Valid=136, Invalid=734, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:57:35,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-06 11:57:35,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-06 11:57:35,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 30 states have internal predecessors, (34), 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 11:57:35,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2021-05-06 11:57:35,617 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 31 [2021-05-06 11:57:35,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:35,617 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2021-05-06 11:57:35,617 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 1.8) internal successors, (27), 14 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 11:57:35,617 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2021-05-06 11:57:35,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-06 11:57:35,618 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:35,618 INFO L523 BasicCegarLoop]: trace histogram [11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:35,618 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-05-06 11:57:35,618 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:35,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:35,618 INFO L82 PathProgramCache]: Analyzing trace with hash -1841155664, now seen corresponding path program 9 times [2021-05-06 11:57:35,618 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:35,619 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1838896701] [2021-05-06 11:57:35,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:35,630 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:35,641 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:35,643 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:35,652 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:35,654 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:35,662 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:35,674 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:35,677 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:57:35,683 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:35,688 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:35,692 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:57:35,699 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:35,700 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:35,703 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:57:35,703 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:35,708 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:35,716 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:57:35,723 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:35,727 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:35,740 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:35,741 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:35,753 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:35,755 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:35,764 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:35,778 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:35,780 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:35,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:35,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:35,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:35,858 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 11:57:35,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:36,109 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:36,109 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1838896701] [2021-05-06 11:57:36,110 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1838896701] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:36,110 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:36,110 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:57:36,110 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536388019] [2021-05-06 11:57:36,110 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:57:36,110 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:36,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:57:36,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:57:36,111 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand has 17 states, 16 states have (on average 1.8125) internal successors, (29), 15 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 11:57:36,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:36,651 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2021-05-06 11:57:36,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:57:36,651 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.8125) internal successors, (29), 15 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 11:57:36,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:36,653 INFO L225 Difference]: With dead ends: 44 [2021-05-06 11:57:36,654 INFO L226 Difference]: Without dead ends: 37 [2021-05-06 11:57:36,654 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 567.6ms TimeCoverageRelationStatistics Valid=147, Invalid=845, Unknown=0, NotChecked=0, Total=992 [2021-05-06 11:57:36,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-06 11:57:36,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-05-06 11:57:36,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.125) internal successors, (36), 32 states have internal predecessors, (36), 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 11:57:36,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2021-05-06 11:57:36,660 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 33 [2021-05-06 11:57:36,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:36,660 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2021-05-06 11:57:36,660 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 1.8125) internal successors, (29), 15 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 11:57:36,661 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2021-05-06 11:57:36,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-06 11:57:36,661 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:36,661 INFO L523 BasicCegarLoop]: trace histogram [12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:36,661 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-05-06 11:57:36,661 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:36,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:36,662 INFO L82 PathProgramCache]: Analyzing trace with hash 412365707, now seen corresponding path program 10 times [2021-05-06 11:57:36,662 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:36,662 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2100532674] [2021-05-06 11:57:36,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:36,673 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:36,674 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:36,680 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:36,691 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:36,693 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:36,713 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:36,725 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:36,728 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:57:36,732 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:36,736 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:36,746 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:57:36,752 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:36,753 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:36,755 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:57:36,760 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:36,763 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:36,767 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:57:36,774 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:36,777 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:36,787 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:36,789 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:36,813 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:36,815 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:36,828 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:36,841 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:36,842 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:36,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:36,930 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:36,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:36,936 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 11:57:36,939 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:37,214 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:37,215 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2100532674] [2021-05-06 11:57:37,215 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2100532674] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:37,215 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:37,215 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:57:37,215 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643549625] [2021-05-06 11:57:37,215 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:57:37,215 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:37,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:57:37,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:57:37,216 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand has 18 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 16 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 11:57:37,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:37,777 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2021-05-06 11:57:37,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 11:57:37,778 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 16 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 11:57:37,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:37,778 INFO L225 Difference]: With dead ends: 46 [2021-05-06 11:57:37,778 INFO L226 Difference]: Without dead ends: 39 [2021-05-06 11:57:37,779 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 667.7ms TimeCoverageRelationStatistics Valid=158, Invalid=964, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 11:57:37,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-06 11:57:37,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-05-06 11:57:37,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 34 states have internal predecessors, (38), 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 11:57:37,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2021-05-06 11:57:37,784 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 35 [2021-05-06 11:57:37,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:37,784 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2021-05-06 11:57:37,784 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 16 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 11:57:37,784 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2021-05-06 11:57:37,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 11:57:37,785 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:37,785 INFO L523 BasicCegarLoop]: trace histogram [13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:37,785 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-05-06 11:57:37,785 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:37,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:37,785 INFO L82 PathProgramCache]: Analyzing trace with hash 1382886054, now seen corresponding path program 11 times [2021-05-06 11:57:37,785 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:37,786 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2084921825] [2021-05-06 11:57:37,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:37,792 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:37,793 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:37,795 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:37,805 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:37,807 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:37,825 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:37,839 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:37,842 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:57:37,847 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:37,851 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:37,854 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:57:37,861 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:37,861 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:37,865 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:57:37,872 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:37,876 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:37,881 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:57:37,888 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:37,897 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:37,898 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:37,901 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:37,912 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:37,914 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:37,929 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:37,941 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:37,942 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:37,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:38,016 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:38,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:38,028 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 11:57:38,030 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:38,275 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:38,275 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2084921825] [2021-05-06 11:57:38,275 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2084921825] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:38,276 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:38,276 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 11:57:38,276 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54439861] [2021-05-06 11:57:38,276 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 11:57:38,276 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:38,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 11:57:38,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=389, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:57:38,276 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 17 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 11:57:38,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:38,897 INFO L93 Difference]: Finished difference Result 48 states and 53 transitions. [2021-05-06 11:57:38,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 11:57:38,898 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 17 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 11:57:38,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:38,898 INFO L225 Difference]: With dead ends: 48 [2021-05-06 11:57:38,898 INFO L226 Difference]: Without dead ends: 41 [2021-05-06 11:57:38,899 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 662.9ms TimeCoverageRelationStatistics Valid=169, Invalid=1091, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 11:57:38,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-06 11:57:38,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-05-06 11:57:38,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.1111111111111112) internal successors, (40), 36 states have internal predecessors, (40), 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 11:57:38,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2021-05-06 11:57:38,905 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 37 [2021-05-06 11:57:38,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:38,905 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2021-05-06 11:57:38,905 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 17 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 11:57:38,905 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2021-05-06 11:57:38,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-06 11:57:38,906 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:38,906 INFO L523 BasicCegarLoop]: trace histogram [14, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:38,906 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-05-06 11:57:38,906 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:38,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:38,906 INFO L82 PathProgramCache]: Analyzing trace with hash 2045036289, now seen corresponding path program 12 times [2021-05-06 11:57:38,907 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:38,907 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [753890649] [2021-05-06 11:57:38,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:38,914 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:38,915 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:38,917 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:38,926 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:38,928 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:38,945 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:38,959 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:38,961 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:57:38,962 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:38,966 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:38,973 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:57:38,979 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:38,981 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:38,985 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:57:38,986 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:38,990 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:38,997 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:57:39,004 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:39,012 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:39,013 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:39,020 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:39,029 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:39,030 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:39,045 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:39,057 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:39,057 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:39,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:39,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:39,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:39,157 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 11:57:39,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:39,462 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:39,462 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [753890649] [2021-05-06 11:57:39,462 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [753890649] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:39,462 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:39,462 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 11:57:39,462 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84691537] [2021-05-06 11:57:39,462 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 11:57:39,462 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:39,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 11:57:39,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=429, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:57:39,463 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 18 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 11:57:40,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:40,160 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2021-05-06 11:57:40,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 11:57:40,161 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 18 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 39 [2021-05-06 11:57:40,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:40,161 INFO L225 Difference]: With dead ends: 50 [2021-05-06 11:57:40,161 INFO L226 Difference]: Without dead ends: 43 [2021-05-06 11:57:40,162 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 233 ImplicationChecksByTransitivity, 765.9ms TimeCoverageRelationStatistics Valid=180, Invalid=1226, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 11:57:40,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-06 11:57:40,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-05-06 11:57:40,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.105263157894737) internal successors, (42), 38 states have internal predecessors, (42), 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 11:57:40,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2021-05-06 11:57:40,168 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 39 [2021-05-06 11:57:40,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:40,168 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2021-05-06 11:57:40,168 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 18 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 11:57:40,168 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2021-05-06 11:57:40,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-06 11:57:40,169 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:40,169 INFO L523 BasicCegarLoop]: trace histogram [15, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:40,169 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-05-06 11:57:40,169 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:40,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:40,169 INFO L82 PathProgramCache]: Analyzing trace with hash -1578714980, now seen corresponding path program 13 times [2021-05-06 11:57:40,170 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:40,170 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [598610010] [2021-05-06 11:57:40,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:40,178 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:40,179 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:40,181 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:40,193 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:40,195 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:40,212 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:40,226 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:40,229 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:57:40,230 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:40,233 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:40,240 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:57:40,247 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:40,247 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:40,253 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:57:40,259 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:40,264 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:40,269 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:57:40,275 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:40,281 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:40,306 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:40,309 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:40,321 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:40,324 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:40,336 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:40,349 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:40,350 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:40,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:40,439 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:40,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:40,443 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 11:57:40,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:40,779 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:40,779 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [598610010] [2021-05-06 11:57:40,779 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [598610010] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:40,779 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:40,779 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:57:40,779 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122724445] [2021-05-06 11:57:40,779 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:57:40,779 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:40,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:57:40,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:57:40,780 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand has 21 states, 20 states have (on average 1.85) internal successors, (37), 19 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 11:57:41,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:41,634 INFO L93 Difference]: Finished difference Result 52 states and 57 transitions. [2021-05-06 11:57:41,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 11:57:41,634 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.85) internal successors, (37), 19 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 41 [2021-05-06 11:57:41,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:41,635 INFO L225 Difference]: With dead ends: 52 [2021-05-06 11:57:41,635 INFO L226 Difference]: Without dead ends: 45 [2021-05-06 11:57:41,636 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 257 ImplicationChecksByTransitivity, 844.7ms TimeCoverageRelationStatistics Valid=191, Invalid=1369, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 11:57:41,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-06 11:57:41,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-05-06 11:57:41,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.1) internal successors, (44), 40 states have internal predecessors, (44), 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 11:57:41,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2021-05-06 11:57:41,642 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 41 [2021-05-06 11:57:41,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:41,642 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2021-05-06 11:57:41,642 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 1.85) internal successors, (37), 19 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 11:57:41,642 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2021-05-06 11:57:41,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 11:57:41,643 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:41,643 INFO L523 BasicCegarLoop]: trace histogram [16, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:41,643 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-05-06 11:57:41,643 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:41,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:41,643 INFO L82 PathProgramCache]: Analyzing trace with hash -785207433, now seen corresponding path program 14 times [2021-05-06 11:57:41,643 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:41,643 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1093828401] [2021-05-06 11:57:41,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:41,651 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:41,652 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:41,657 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:41,667 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:41,669 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:41,686 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:41,700 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:41,703 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:57:41,710 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:41,714 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:41,719 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:57:41,726 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:41,727 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:41,730 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:57:41,731 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:41,735 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:41,744 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:57:41,752 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:41,757 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:41,758 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:41,760 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:41,769 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:41,771 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:41,789 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:41,801 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:41,803 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:41,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:41,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:41,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:41,896 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 11:57:41,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:42,239 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:42,239 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1093828401] [2021-05-06 11:57:42,239 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1093828401] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:42,239 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:42,239 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:57:42,239 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431704379] [2021-05-06 11:57:42,240 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:57:42,240 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:42,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:57:42,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=515, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:57:42,241 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand has 22 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 20 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:43,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:43,159 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2021-05-06 11:57:43,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 11:57:43,159 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 20 states have internal predecessors, (39), 2 states have call successors, (3), 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 43 [2021-05-06 11:57:43,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:43,159 INFO L225 Difference]: With dead ends: 54 [2021-05-06 11:57:43,160 INFO L226 Difference]: Without dead ends: 47 [2021-05-06 11:57:43,160 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 282 ImplicationChecksByTransitivity, 915.7ms TimeCoverageRelationStatistics Valid=202, Invalid=1520, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 11:57:43,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-06 11:57:43,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-05-06 11:57:43,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0952380952380953) internal successors, (46), 42 states have internal predecessors, (46), 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 11:57:43,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions. [2021-05-06 11:57:43,166 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 43 [2021-05-06 11:57:43,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:43,167 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 50 transitions. [2021-05-06 11:57:43,167 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 20 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:43,167 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions. [2021-05-06 11:57:43,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-06 11:57:43,167 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:43,167 INFO L523 BasicCegarLoop]: trace histogram [17, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:43,168 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2021-05-06 11:57:43,168 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:43,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:43,168 INFO L82 PathProgramCache]: Analyzing trace with hash 1566333842, now seen corresponding path program 15 times [2021-05-06 11:57:43,168 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:43,168 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [414320859] [2021-05-06 11:57:43,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:43,178 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:43,191 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:43,194 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:43,206 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:43,208 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:43,218 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:43,232 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:43,235 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:57:43,236 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:43,241 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:43,249 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:57:43,256 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:43,257 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:43,261 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:57:43,262 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:43,266 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:43,274 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:57:43,283 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:43,287 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:43,288 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:43,290 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:43,300 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:43,303 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:43,322 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:43,338 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:43,339 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:43,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:43,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:43,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:43,425 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 11:57:43,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:43,801 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:43,801 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [414320859] [2021-05-06 11:57:43,801 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [414320859] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:43,801 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:43,801 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 11:57:43,801 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [655374732] [2021-05-06 11:57:43,802 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 11:57:43,802 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:43,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 11:57:43,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=561, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:57:43,802 INFO L87 Difference]: Start difference. First operand 47 states and 50 transitions. Second operand has 23 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 21 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 11:57:44,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:44,766 INFO L93 Difference]: Finished difference Result 56 states and 61 transitions. [2021-05-06 11:57:44,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:57:44,767 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 21 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 45 [2021-05-06 11:57:44,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:44,767 INFO L225 Difference]: With dead ends: 56 [2021-05-06 11:57:44,767 INFO L226 Difference]: Without dead ends: 49 [2021-05-06 11:57:44,768 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 986.3ms TimeCoverageRelationStatistics Valid=213, Invalid=1679, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 11:57:44,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-06 11:57:44,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-05-06 11:57:44,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.0909090909090908) internal successors, (48), 44 states have internal predecessors, (48), 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 11:57:44,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2021-05-06 11:57:44,774 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 45 [2021-05-06 11:57:44,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:44,774 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2021-05-06 11:57:44,774 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 21 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 11:57:44,774 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2021-05-06 11:57:44,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-06 11:57:44,775 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:44,775 INFO L523 BasicCegarLoop]: trace histogram [18, 16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:44,775 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2021-05-06 11:57:44,775 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:44,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:44,775 INFO L82 PathProgramCache]: Analyzing trace with hash -2050265875, now seen corresponding path program 16 times [2021-05-06 11:57:44,775 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:44,776 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1317637564] [2021-05-06 11:57:44,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:44,784 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:44,785 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:44,787 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:44,798 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:44,800 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:44,819 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:44,834 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:44,838 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:57:44,839 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:44,844 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:44,853 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:57:44,861 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:44,862 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:44,865 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:57:44,870 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:44,875 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:44,880 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:57:44,888 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:44,896 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:44,908 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:44,910 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:44,919 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:44,921 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:44,931 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:44,950 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:44,951 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:44,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:45,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:45,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:45,053 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 11:57:45,056 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:45,467 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:45,468 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1317637564] [2021-05-06 11:57:45,468 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1317637564] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:45,468 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:45,468 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:57:45,468 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972513816] [2021-05-06 11:57:45,468 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:57:45,468 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:45,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:57:45,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=609, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:57:45,469 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand has 24 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 22 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 11:57:46,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:46,482 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2021-05-06 11:57:46,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 11:57:46,483 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 22 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 47 [2021-05-06 11:57:46,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:46,483 INFO L225 Difference]: With dead ends: 58 [2021-05-06 11:57:46,483 INFO L226 Difference]: Without dead ends: 51 [2021-05-06 11:57:46,484 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 335 ImplicationChecksByTransitivity, 1031.0ms TimeCoverageRelationStatistics Valid=224, Invalid=1846, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 11:57:46,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-06 11:57:46,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-05-06 11:57:46,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.0869565217391304) internal successors, (50), 46 states have internal predecessors, (50), 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 11:57:46,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2021-05-06 11:57:46,492 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 47 [2021-05-06 11:57:46,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:46,492 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2021-05-06 11:57:46,492 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 22 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 11:57:46,492 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2021-05-06 11:57:46,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 11:57:46,493 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:46,493 INFO L523 BasicCegarLoop]: trace histogram [19, 17, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:46,493 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2021-05-06 11:57:46,493 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:46,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:46,493 INFO L82 PathProgramCache]: Analyzing trace with hash 1320915848, now seen corresponding path program 17 times [2021-05-06 11:57:46,493 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:46,493 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1465946967] [2021-05-06 11:57:46,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:46,501 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:46,512 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:46,515 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:46,524 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:46,526 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:46,536 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:46,549 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:46,553 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:57:46,558 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:46,562 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:46,566 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:57:46,573 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:46,574 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:46,577 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:57:46,578 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:46,583 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:46,591 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:57:46,598 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:46,602 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:46,611 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:46,613 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:46,623 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:46,625 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:46,633 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:46,646 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:46,656 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:46,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:46,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:46,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:46,773 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 11:57:46,775 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:47,222 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:47,222 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1465946967] [2021-05-06 11:57:47,222 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1465946967] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:47,222 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:47,222 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 11:57:47,223 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086184444] [2021-05-06 11:57:47,223 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 11:57:47,223 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:47,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 11:57:47,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2021-05-06 11:57:47,224 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand has 25 states, 24 states have (on average 1.875) internal successors, (45), 23 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 11:57:48,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:48,260 INFO L93 Difference]: Finished difference Result 60 states and 65 transitions. [2021-05-06 11:57:48,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 11:57:48,260 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.875) internal successors, (45), 23 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 49 [2021-05-06 11:57:48,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:48,261 INFO L225 Difference]: With dead ends: 60 [2021-05-06 11:57:48,261 INFO L226 Difference]: Without dead ends: 53 [2021-05-06 11:57:48,261 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 363 ImplicationChecksByTransitivity, 1093.0ms TimeCoverageRelationStatistics Valid=235, Invalid=2021, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 11:57:48,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-06 11:57:48,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-05-06 11:57:48,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0833333333333333) internal successors, (52), 48 states have internal predecessors, (52), 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 11:57:48,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2021-05-06 11:57:48,269 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 49 [2021-05-06 11:57:48,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:48,270 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2021-05-06 11:57:48,270 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 24 states have (on average 1.875) internal successors, (45), 23 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 11:57:48,270 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2021-05-06 11:57:48,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 11:57:48,272 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:48,272 INFO L523 BasicCegarLoop]: trace histogram [20, 18, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:48,272 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2021-05-06 11:57:48,272 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:48,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:48,272 INFO L82 PathProgramCache]: Analyzing trace with hash -1673756829, now seen corresponding path program 18 times [2021-05-06 11:57:48,272 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:48,272 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1052268457] [2021-05-06 11:57:48,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:48,280 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:48,281 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:48,282 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:48,290 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:48,291 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:48,318 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:48,333 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:48,337 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:57:48,337 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:48,341 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:48,348 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:57:48,354 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:48,355 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:48,357 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:57:48,361 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:48,365 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:48,368 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:57:48,375 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:48,378 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:48,379 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:48,381 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:48,389 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:48,391 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:48,406 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:48,417 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:48,418 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:48,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:48,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:48,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:48,506 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 11:57:48,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:48,967 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:48,967 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1052268457] [2021-05-06 11:57:48,968 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1052268457] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:48,968 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:48,968 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:57:48,968 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440825726] [2021-05-06 11:57:48,968 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:57:48,968 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:48,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:57:48,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=711, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:57:48,969 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand has 26 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:50,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:50,123 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2021-05-06 11:57:50,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 11:57:50,124 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 2 states have call successors, (3), 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 11:57:50,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:50,124 INFO L225 Difference]: With dead ends: 62 [2021-05-06 11:57:50,125 INFO L226 Difference]: Without dead ends: 55 [2021-05-06 11:57:50,125 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 392 ImplicationChecksByTransitivity, 1165.7ms TimeCoverageRelationStatistics Valid=246, Invalid=2204, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 11:57:50,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-06 11:57:50,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-06 11:57:50,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.08) internal successors, (54), 50 states have internal predecessors, (54), 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 11:57:50,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2021-05-06 11:57:50,130 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 51 [2021-05-06 11:57:50,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:50,130 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2021-05-06 11:57:50,130 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:50,130 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2021-05-06 11:57:50,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-06 11:57:50,131 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:50,131 INFO L523 BasicCegarLoop]: trace histogram [21, 19, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:50,131 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2021-05-06 11:57:50,131 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:50,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:50,131 INFO L82 PathProgramCache]: Analyzing trace with hash -1926111106, now seen corresponding path program 19 times [2021-05-06 11:57:50,131 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:50,131 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [293639661] [2021-05-06 11:57:50,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:50,145 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:50,146 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:50,148 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:50,158 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:50,160 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:50,176 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:50,191 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:50,194 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:57:50,199 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:50,204 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:50,209 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:57:50,217 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:50,217 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:50,219 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:57:50,220 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:50,224 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:50,234 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:57:50,242 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:50,246 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:50,246 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:50,249 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:50,258 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:50,261 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:50,279 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:50,294 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:50,296 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:50,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:50,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:50,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:50,399 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 11:57:50,400 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:50,870 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:50,870 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [293639661] [2021-05-06 11:57:50,870 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [293639661] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:50,870 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:50,870 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 11:57:50,870 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026136999] [2021-05-06 11:57:50,870 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 11:57:50,870 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:50,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 11:57:50,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=765, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:57:50,871 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand has 27 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 25 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 11:57:51,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:51,998 INFO L93 Difference]: Finished difference Result 64 states and 69 transitions. [2021-05-06 11:57:51,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 11:57:51,999 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 25 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 53 [2021-05-06 11:57:51,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:51,999 INFO L225 Difference]: With dead ends: 64 [2021-05-06 11:57:51,999 INFO L226 Difference]: Without dead ends: 57 [2021-05-06 11:57:52,000 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 422 ImplicationChecksByTransitivity, 1190.1ms TimeCoverageRelationStatistics Valid=257, Invalid=2395, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 11:57:52,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-06 11:57:52,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-05-06 11:57:52,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.0769230769230769) internal successors, (56), 52 states have internal predecessors, (56), 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 11:57:52,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2021-05-06 11:57:52,008 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 53 [2021-05-06 11:57:52,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:52,008 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2021-05-06 11:57:52,008 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 25 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 11:57:52,008 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2021-05-06 11:57:52,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 11:57:52,009 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:52,009 INFO L523 BasicCegarLoop]: trace histogram [22, 20, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:52,009 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2021-05-06 11:57:52,009 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:52,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:52,009 INFO L82 PathProgramCache]: Analyzing trace with hash 374564569, now seen corresponding path program 20 times [2021-05-06 11:57:52,009 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:52,010 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [461576513] [2021-05-06 11:57:52,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:52,019 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:52,028 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:52,029 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:52,037 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:52,039 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:52,047 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:52,061 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:52,068 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:57:52,068 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:52,075 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:52,083 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:57:52,090 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:52,090 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:52,092 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:57:52,092 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:52,098 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:52,108 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:57:52,117 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:52,121 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:52,121 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:52,123 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:52,134 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:52,136 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:52,150 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:52,162 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:52,163 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:52,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:52,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:52,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:52,251 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 11:57:52,253 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:52,753 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:52,753 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [461576513] [2021-05-06 11:57:52,753 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [461576513] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:52,753 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:52,753 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 11:57:52,753 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837540526] [2021-05-06 11:57:52,753 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 11:57:52,753 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:52,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 11:57:52,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=821, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:57:52,754 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand has 28 states, 27 states have (on average 1.8888888888888888) internal successors, (51), 26 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 11:57:53,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:53,990 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2021-05-06 11:57:53,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 11:57:53,991 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 1.8888888888888888) internal successors, (51), 26 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 55 [2021-05-06 11:57:53,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:53,991 INFO L225 Difference]: With dead ends: 66 [2021-05-06 11:57:53,991 INFO L226 Difference]: Without dead ends: 59 [2021-05-06 11:57:53,992 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 453 ImplicationChecksByTransitivity, 1280.8ms TimeCoverageRelationStatistics Valid=268, Invalid=2594, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 11:57:53,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-06 11:57:53,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-05-06 11:57:53,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.0740740740740742) internal successors, (58), 54 states have internal predecessors, (58), 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 11:57:53,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2021-05-06 11:57:53,997 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 55 [2021-05-06 11:57:53,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:53,997 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2021-05-06 11:57:53,997 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 27 states have (on average 1.8888888888888888) internal successors, (51), 26 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 11:57:53,997 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2021-05-06 11:57:53,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-06 11:57:53,997 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:53,997 INFO L523 BasicCegarLoop]: trace histogram [23, 21, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:53,997 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2021-05-06 11:57:53,997 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:53,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:53,998 INFO L82 PathProgramCache]: Analyzing trace with hash -584269196, now seen corresponding path program 21 times [2021-05-06 11:57:53,998 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:53,998 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [57272232] [2021-05-06 11:57:53,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:54,008 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:54,017 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:54,018 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:54,025 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:54,027 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:54,036 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:54,048 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:54,050 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:57:54,050 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:54,054 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:54,066 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:57:54,072 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:54,073 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:54,075 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:57:54,075 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:54,079 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:54,086 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:57:54,093 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:54,099 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:54,099 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:54,101 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:54,108 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:54,110 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:54,137 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:54,148 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:54,155 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:54,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:54,245 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:54,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:54,248 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 11:57:54,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:54,876 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:54,876 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [57272232] [2021-05-06 11:57:54,876 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [57272232] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:54,876 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:54,876 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 11:57:54,876 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1730473177] [2021-05-06 11:57:54,877 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 11:57:54,877 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:54,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 11:57:54,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=879, Unknown=0, NotChecked=0, Total=992 [2021-05-06 11:57:54,878 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand has 29 states, 28 states have (on average 1.8928571428571428) internal successors, (53), 27 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 11:57:56,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:56,270 INFO L93 Difference]: Finished difference Result 68 states and 73 transitions. [2021-05-06 11:57:56,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 11:57:56,271 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 1.8928571428571428) internal successors, (53), 27 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 57 [2021-05-06 11:57:56,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:56,271 INFO L225 Difference]: With dead ends: 68 [2021-05-06 11:57:56,271 INFO L226 Difference]: Without dead ends: 61 [2021-05-06 11:57:56,272 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 485 ImplicationChecksByTransitivity, 1476.6ms TimeCoverageRelationStatistics Valid=279, Invalid=2801, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 11:57:56,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-06 11:57:56,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-05-06 11:57:56,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0714285714285714) internal successors, (60), 56 states have internal predecessors, (60), 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 11:57:56,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2021-05-06 11:57:56,277 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 57 [2021-05-06 11:57:56,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:56,277 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2021-05-06 11:57:56,277 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 28 states have (on average 1.8928571428571428) internal successors, (53), 27 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 11:57:56,278 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2021-05-06 11:57:56,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-06 11:57:56,278 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:56,278 INFO L523 BasicCegarLoop]: trace histogram [24, 22, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:56,278 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64 [2021-05-06 11:57:56,278 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:56,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:56,279 INFO L82 PathProgramCache]: Analyzing trace with hash 1394451279, now seen corresponding path program 22 times [2021-05-06 11:57:56,279 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:56,279 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [472430262] [2021-05-06 11:57:56,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:56,289 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:56,290 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:56,292 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:56,299 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:56,301 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:56,317 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:56,334 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:56,337 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:57:56,338 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:56,343 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:56,354 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:57:56,361 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:56,362 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:56,364 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:57:56,369 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:56,372 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:56,377 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:57:56,383 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:56,387 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:56,387 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:56,389 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:56,396 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:56,398 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:56,414 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:56,426 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:56,427 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:56,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:56,497 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:56,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:56,509 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 11:57:56,511 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:57,121 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:57,122 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [472430262] [2021-05-06 11:57:57,122 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [472430262] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:57,122 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:57,122 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 11:57:57,122 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764089068] [2021-05-06 11:57:57,122 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 11:57:57,122 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:57,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 11:57:57,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=939, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:57:57,123 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand has 30 states, 29 states have (on average 1.896551724137931) internal successors, (55), 28 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 11:57:58,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:58,594 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2021-05-06 11:57:58,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 11:57:58,595 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 1.896551724137931) internal successors, (55), 28 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 59 [2021-05-06 11:57:58,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:58,596 INFO L225 Difference]: With dead ends: 70 [2021-05-06 11:57:58,596 INFO L226 Difference]: Without dead ends: 63 [2021-05-06 11:57:58,597 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 518 ImplicationChecksByTransitivity, 1470.1ms TimeCoverageRelationStatistics Valid=290, Invalid=3016, Unknown=0, NotChecked=0, Total=3306 [2021-05-06 11:57:58,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-06 11:57:58,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-05-06 11:57:58,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0689655172413792) internal successors, (62), 58 states have internal predecessors, (62), 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 11:57:58,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2021-05-06 11:57:58,602 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 59 [2021-05-06 11:57:58,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:58,602 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2021-05-06 11:57:58,602 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 29 states have (on average 1.896551724137931) internal successors, (55), 28 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 11:57:58,603 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2021-05-06 11:57:58,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 11:57:58,603 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:58,603 INFO L523 BasicCegarLoop]: trace histogram [25, 23, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:58,603 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67 [2021-05-06 11:57:58,603 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:58,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:58,604 INFO L82 PathProgramCache]: Analyzing trace with hash 274315626, now seen corresponding path program 23 times [2021-05-06 11:57:58,604 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:58,604 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1493292328] [2021-05-06 11:57:58,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:58,612 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:58,623 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:58,625 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:58,635 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:58,637 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:58,647 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:58,661 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:58,664 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:57:58,669 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:58,673 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:58,678 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:57:58,686 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:58,687 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:58,689 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:57:58,694 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:58,698 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:58,703 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:57:58,711 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:58,715 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:57:58,716 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:58,717 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:58,727 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:58,730 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:58,747 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:57:58,760 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:58,761 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:58,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:58,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:58,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:58,848 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 11:57:58,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:59,438 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:59,438 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1493292328] [2021-05-06 11:57:59,439 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1493292328] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:59,439 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:59,439 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 11:57:59,439 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102624339] [2021-05-06 11:57:59,439 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 11:57:59,439 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:59,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 11:57:59,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=1001, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 11:57:59,440 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand has 31 states, 30 states have (on average 1.9) internal successors, (57), 29 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:00,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:00,899 INFO L93 Difference]: Finished difference Result 72 states and 77 transitions. [2021-05-06 11:58:00,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 11:58:00,899 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 1.9) internal successors, (57), 29 states have internal predecessors, (57), 2 states have call successors, (3), 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 61 [2021-05-06 11:58:00,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:00,900 INFO L225 Difference]: With dead ends: 72 [2021-05-06 11:58:00,900 INFO L226 Difference]: Without dead ends: 65 [2021-05-06 11:58:00,901 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 552 ImplicationChecksByTransitivity, 1488.0ms TimeCoverageRelationStatistics Valid=301, Invalid=3239, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 11:58:00,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-06 11:58:00,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2021-05-06 11:58:00,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 60 states have (on average 1.0666666666666667) internal successors, (64), 60 states have internal predecessors, (64), 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 11:58:00,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2021-05-06 11:58:00,906 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 61 [2021-05-06 11:58:00,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:00,906 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2021-05-06 11:58:00,906 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 30 states have (on average 1.9) internal successors, (57), 29 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:00,906 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2021-05-06 11:58:00,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-06 11:58:00,907 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:00,907 INFO L523 BasicCegarLoop]: trace histogram [26, 24, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:00,907 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70 [2021-05-06 11:58:00,907 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:00,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:00,907 INFO L82 PathProgramCache]: Analyzing trace with hash 1860744389, now seen corresponding path program 24 times [2021-05-06 11:58:00,908 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:00,908 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1405870951] [2021-05-06 11:58:00,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:00,917 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:00,917 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:00,919 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:00,928 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:00,930 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:00,948 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:00,961 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:00,964 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:58:00,968 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:00,974 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:00,979 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:58:00,986 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:00,987 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:00,988 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:58:00,993 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:00,997 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:01,001 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:58:01,007 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:01,011 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:01,032 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:01,034 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:01,045 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:01,047 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:01,057 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:01,073 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:01,075 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:01,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:01,164 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:01,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:01,169 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 11:58:01,170 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:01,883 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:01,884 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1405870951] [2021-05-06 11:58:01,884 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1405870951] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:01,884 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:01,884 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 11:58:01,884 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543292203] [2021-05-06 11:58:01,884 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 11:58:01,884 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:01,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 11:58:01,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1065, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:58:01,885 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand has 32 states, 31 states have (on average 1.903225806451613) internal successors, (59), 30 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 11:58:03,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:03,510 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2021-05-06 11:58:03,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 11:58:03,511 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 1.903225806451613) internal successors, (59), 30 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 63 [2021-05-06 11:58:03,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:03,511 INFO L225 Difference]: With dead ends: 74 [2021-05-06 11:58:03,511 INFO L226 Difference]: Without dead ends: 67 [2021-05-06 11:58:03,512 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 587 ImplicationChecksByTransitivity, 1637.3ms TimeCoverageRelationStatistics Valid=312, Invalid=3470, Unknown=0, NotChecked=0, Total=3782 [2021-05-06 11:58:03,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-05-06 11:58:03,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2021-05-06 11:58:03,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.064516129032258) internal successors, (66), 62 states have internal predecessors, (66), 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 11:58:03,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2021-05-06 11:58:03,517 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 63 [2021-05-06 11:58:03,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:03,517 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2021-05-06 11:58:03,517 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 31 states have (on average 1.903225806451613) internal successors, (59), 30 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 11:58:03,517 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2021-05-06 11:58:03,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-06 11:58:03,518 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:03,518 INFO L523 BasicCegarLoop]: trace histogram [27, 25, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:03,518 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73 [2021-05-06 11:58:03,518 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:03,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:03,518 INFO L82 PathProgramCache]: Analyzing trace with hash 1705395552, now seen corresponding path program 25 times [2021-05-06 11:58:03,518 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:03,518 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [796162900] [2021-05-06 11:58:03,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:03,527 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:03,527 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:03,537 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:03,546 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:03,547 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:03,564 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:03,576 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:03,581 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:58:03,581 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:03,585 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:03,592 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:58:03,599 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:03,599 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:03,601 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:58:03,606 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:03,610 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:03,613 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:58:03,620 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:03,623 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:03,623 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:03,627 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:03,634 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:03,636 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:03,650 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:03,662 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:03,663 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:03,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:03,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:03,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:03,745 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 11:58:03,747 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:04,373 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:04,374 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [796162900] [2021-05-06 11:58:04,374 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [796162900] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:04,374 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:04,374 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 11:58:04,374 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1812718930] [2021-05-06 11:58:04,374 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 11:58:04,374 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:04,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 11:58:04,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1131, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 11:58:04,375 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand has 33 states, 32 states have (on average 1.90625) internal successors, (61), 31 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 11:58:06,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:06,088 INFO L93 Difference]: Finished difference Result 76 states and 81 transitions. [2021-05-06 11:58:06,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 11:58:06,088 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 1.90625) internal successors, (61), 31 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 65 [2021-05-06 11:58:06,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:06,089 INFO L225 Difference]: With dead ends: 76 [2021-05-06 11:58:06,089 INFO L226 Difference]: Without dead ends: 69 [2021-05-06 11:58:06,090 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 623 ImplicationChecksByTransitivity, 1650.7ms TimeCoverageRelationStatistics Valid=323, Invalid=3709, Unknown=0, NotChecked=0, Total=4032 [2021-05-06 11:58:06,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-06 11:58:06,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-05-06 11:58:06,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.0625) internal successors, (68), 64 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 11:58:06,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2021-05-06 11:58:06,096 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 65 [2021-05-06 11:58:06,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:06,096 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2021-05-06 11:58:06,096 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 32 states have (on average 1.90625) internal successors, (61), 31 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 11:58:06,096 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2021-05-06 11:58:06,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 11:58:06,097 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:06,097 INFO L523 BasicCegarLoop]: trace histogram [28, 26, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:06,097 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76 [2021-05-06 11:58:06,097 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:06,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:06,097 INFO L82 PathProgramCache]: Analyzing trace with hash -1555948741, now seen corresponding path program 26 times [2021-05-06 11:58:06,097 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:06,097 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [676398466] [2021-05-06 11:58:06,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:06,105 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:06,105 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:06,107 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:06,118 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:06,119 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:06,136 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:06,149 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:06,153 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:58:06,153 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:06,157 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:06,166 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:58:06,173 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:06,174 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:06,176 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:58:06,181 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:06,186 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:06,195 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:58:06,202 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:06,207 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:06,207 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:06,209 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:06,218 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:06,220 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:06,235 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:06,247 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:06,248 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:06,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:06,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:06,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:06,327 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 11:58:06,328 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:07,019 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:07,019 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [676398466] [2021-05-06 11:58:07,019 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [676398466] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:07,019 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:07,019 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 11:58:07,019 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359078696] [2021-05-06 11:58:07,020 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 11:58:07,020 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:07,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 11:58:07,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=1199, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 11:58:07,021 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand has 34 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 32 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:08,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:08,771 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2021-05-06 11:58:08,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 11:58:08,772 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 32 states have internal predecessors, (63), 2 states have call successors, (3), 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 11:58:08,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:08,772 INFO L225 Difference]: With dead ends: 78 [2021-05-06 11:58:08,772 INFO L226 Difference]: Without dead ends: 71 [2021-05-06 11:58:08,773 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 660 ImplicationChecksByTransitivity, 1721.0ms TimeCoverageRelationStatistics Valid=334, Invalid=3956, Unknown=0, NotChecked=0, Total=4290 [2021-05-06 11:58:08,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-06 11:58:08,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-05-06 11:58:08,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0606060606060606) internal successors, (70), 66 states have internal predecessors, (70), 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 11:58:08,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2021-05-06 11:58:08,778 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 67 [2021-05-06 11:58:08,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:08,778 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2021-05-06 11:58:08,778 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 32 states have internal predecessors, (63), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:08,779 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2021-05-06 11:58:08,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 11:58:08,779 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:08,779 INFO L523 BasicCegarLoop]: trace histogram [29, 27, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:08,779 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79 [2021-05-06 11:58:08,779 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:08,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:08,779 INFO L82 PathProgramCache]: Analyzing trace with hash -381688234, now seen corresponding path program 27 times [2021-05-06 11:58:08,779 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:08,779 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [313322169] [2021-05-06 11:58:08,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:08,789 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:08,797 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:08,799 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:08,806 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:08,808 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:08,815 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:08,827 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:08,829 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:58:08,830 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:08,833 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:08,840 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:58:08,846 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:08,847 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:08,859 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:58:08,863 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:08,867 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:08,871 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:58:08,877 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:08,880 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:08,881 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:08,882 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:08,888 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:08,890 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:08,903 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:08,915 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:08,916 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:08,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:08,989 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:08,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:09,005 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 11:58:09,006 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:09,714 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:09,715 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [313322169] [2021-05-06 11:58:09,715 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [313322169] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:09,715 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:09,715 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 11:58:09,715 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258516259] [2021-05-06 11:58:09,715 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 11:58:09,715 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:09,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 11:58:09,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=1269, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 11:58:09,716 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand has 35 states, 34 states have (on average 1.911764705882353) internal successors, (65), 33 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 11:58:11,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:11,612 INFO L93 Difference]: Finished difference Result 80 states and 85 transitions. [2021-05-06 11:58:11,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 11:58:11,613 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.911764705882353) internal successors, (65), 33 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 69 [2021-05-06 11:58:11,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:11,613 INFO L225 Difference]: With dead ends: 80 [2021-05-06 11:58:11,613 INFO L226 Difference]: Without dead ends: 73 [2021-05-06 11:58:11,614 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 698 ImplicationChecksByTransitivity, 1763.4ms TimeCoverageRelationStatistics Valid=345, Invalid=4211, Unknown=0, NotChecked=0, Total=4556 [2021-05-06 11:58:11,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-06 11:58:11,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2021-05-06 11:58:11,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.0588235294117647) internal successors, (72), 68 states have internal predecessors, (72), 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 11:58:11,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2021-05-06 11:58:11,620 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 69 [2021-05-06 11:58:11,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:11,620 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2021-05-06 11:58:11,620 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 34 states have (on average 1.911764705882353) internal successors, (65), 33 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 11:58:11,620 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2021-05-06 11:58:11,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-06 11:58:11,620 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:11,620 INFO L523 BasicCegarLoop]: trace histogram [30, 28, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:11,620 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82 [2021-05-06 11:58:11,620 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:11,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:11,621 INFO L82 PathProgramCache]: Analyzing trace with hash -1493739855, now seen corresponding path program 28 times [2021-05-06 11:58:11,621 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:11,621 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1602248383] [2021-05-06 11:58:11,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:11,628 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:11,638 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:11,639 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:11,646 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:11,648 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:11,655 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:11,667 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:11,672 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:58:11,673 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:11,676 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:11,690 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:58:11,696 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:11,697 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:11,703 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:58:11,703 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:11,707 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:11,715 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:58:11,721 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:11,733 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:11,745 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:11,746 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:11,756 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:11,759 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:11,767 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:11,781 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:11,782 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:11,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:11,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:11,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:11,857 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 11:58:11,858 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:12,691 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:12,691 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1602248383] [2021-05-06 11:58:12,691 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1602248383] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:12,692 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:12,692 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 11:58:12,692 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [617259465] [2021-05-06 11:58:12,692 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 11:58:12,692 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:12,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 11:58:12,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=1341, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 11:58:12,692 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand has 36 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 34 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 11:58:14,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:14,597 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2021-05-06 11:58:14,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 11:58:14,597 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 34 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 71 [2021-05-06 11:58:14,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:14,598 INFO L225 Difference]: With dead ends: 82 [2021-05-06 11:58:14,598 INFO L226 Difference]: Without dead ends: 75 [2021-05-06 11:58:14,598 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 737 ImplicationChecksByTransitivity, 1949.2ms TimeCoverageRelationStatistics Valid=356, Invalid=4474, Unknown=0, NotChecked=0, Total=4830 [2021-05-06 11:58:14,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-05-06 11:58:14,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-05-06 11:58:14,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.0571428571428572) internal successors, (74), 70 states have internal predecessors, (74), 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 11:58:14,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2021-05-06 11:58:14,605 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 71 [2021-05-06 11:58:14,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:14,605 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2021-05-06 11:58:14,605 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 34 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 11:58:14,606 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2021-05-06 11:58:14,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 11:58:14,606 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:14,606 INFO L523 BasicCegarLoop]: trace histogram [31, 29, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:14,606 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable85 [2021-05-06 11:58:14,606 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:14,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:14,606 INFO L82 PathProgramCache]: Analyzing trace with hash -728490932, now seen corresponding path program 29 times [2021-05-06 11:58:14,606 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:14,607 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1866451261] [2021-05-06 11:58:14,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:14,613 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:14,613 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:14,615 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:14,623 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:14,625 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:14,638 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:14,650 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:14,662 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:58:14,666 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:14,669 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:14,673 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:58:14,680 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:14,680 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:14,682 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:58:14,682 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:14,686 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:14,693 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:58:14,699 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:14,702 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:14,711 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:14,712 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:14,719 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:14,721 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:14,733 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:14,745 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:14,746 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:14,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:14,815 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:14,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:14,819 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 11:58:14,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:15,594 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:15,594 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1866451261] [2021-05-06 11:58:15,594 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1866451261] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:15,594 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:15,594 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 11:58:15,594 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376733067] [2021-05-06 11:58:15,594 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 11:58:15,594 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:15,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 11:58:15,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1415, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 11:58:15,595 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand has 37 states, 36 states have (on average 1.9166666666666667) internal successors, (69), 35 states have internal predecessors, (69), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:17,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:17,668 INFO L93 Difference]: Finished difference Result 84 states and 89 transitions. [2021-05-06 11:58:17,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 11:58:17,669 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 1.9166666666666667) internal successors, (69), 35 states have internal predecessors, (69), 2 states have call successors, (3), 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 11:58:17,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:17,669 INFO L225 Difference]: With dead ends: 84 [2021-05-06 11:58:17,669 INFO L226 Difference]: Without dead ends: 77 [2021-05-06 11:58:17,669 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 777 ImplicationChecksByTransitivity, 1940.6ms TimeCoverageRelationStatistics Valid=367, Invalid=4745, Unknown=0, NotChecked=0, Total=5112 [2021-05-06 11:58:17,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-06 11:58:17,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2021-05-06 11:58:17,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.0555555555555556) internal successors, (76), 72 states have internal predecessors, (76), 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 11:58:17,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2021-05-06 11:58:17,677 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 73 [2021-05-06 11:58:17,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:17,677 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2021-05-06 11:58:17,677 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 36 states have (on average 1.9166666666666667) internal successors, (69), 35 states have internal predecessors, (69), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:17,677 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2021-05-06 11:58:17,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-06 11:58:17,678 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:17,678 INFO L523 BasicCegarLoop]: trace histogram [32, 30, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:17,678 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable88 [2021-05-06 11:58:17,678 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:17,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:17,678 INFO L82 PathProgramCache]: Analyzing trace with hash 236316455, now seen corresponding path program 30 times [2021-05-06 11:58:17,678 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:17,678 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1535354375] [2021-05-06 11:58:17,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:17,685 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:17,686 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:17,687 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:17,696 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:17,698 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:17,714 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:17,726 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:17,728 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:58:17,732 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:17,736 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:17,739 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:58:17,746 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:17,746 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:17,751 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:58:17,755 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:17,759 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:17,763 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:58:17,769 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:17,787 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:17,796 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:17,797 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:17,805 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:17,807 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:17,814 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:17,826 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:17,827 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:17,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:17,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:17,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:17,901 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 11:58:17,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:18,719 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:18,719 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1535354375] [2021-05-06 11:58:18,719 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1535354375] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:18,719 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:18,719 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 11:58:18,719 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52134310] [2021-05-06 11:58:18,720 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 11:58:18,720 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:18,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 11:58:18,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1491, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 11:58:18,720 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand has 38 states, 37 states have (on average 1.9189189189189189) internal successors, (71), 36 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 11:58:20,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:20,842 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2021-05-06 11:58:20,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 11:58:20,842 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 1.9189189189189189) internal successors, (71), 36 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 75 [2021-05-06 11:58:20,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:20,843 INFO L225 Difference]: With dead ends: 86 [2021-05-06 11:58:20,843 INFO L226 Difference]: Without dead ends: 79 [2021-05-06 11:58:20,844 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 818 ImplicationChecksByTransitivity, 2051.6ms TimeCoverageRelationStatistics Valid=378, Invalid=5024, Unknown=0, NotChecked=0, Total=5402 [2021-05-06 11:58:20,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-06 11:58:20,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2021-05-06 11:58:20,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.054054054054054) internal successors, (78), 74 states have internal predecessors, (78), 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 11:58:20,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2021-05-06 11:58:20,851 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 75 [2021-05-06 11:58:20,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:20,851 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2021-05-06 11:58:20,851 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 37 states have (on average 1.9189189189189189) internal successors, (71), 36 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 11:58:20,851 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2021-05-06 11:58:20,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 11:58:20,851 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:20,851 INFO L523 BasicCegarLoop]: trace histogram [33, 31, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:20,851 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91 [2021-05-06 11:58:20,851 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:20,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:20,852 INFO L82 PathProgramCache]: Analyzing trace with hash -296720574, now seen corresponding path program 31 times [2021-05-06 11:58:20,852 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:20,852 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [280261273] [2021-05-06 11:58:20,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:20,858 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:20,867 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:20,868 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:20,875 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:20,877 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:20,884 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:20,896 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:20,898 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:58:20,902 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:20,906 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:20,909 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:58:20,916 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:20,917 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:20,919 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:58:20,919 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:20,923 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:20,930 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:58:20,937 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:20,940 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:20,940 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:20,941 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:20,949 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:20,951 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:20,978 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:20,990 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:20,991 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:20,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:21,059 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:21,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:21,063 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 11:58:21,064 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:21,917 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:21,918 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [280261273] [2021-05-06 11:58:21,918 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [280261273] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:21,918 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:21,918 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 11:58:21,918 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [977927946] [2021-05-06 11:58:21,918 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 11:58:21,918 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:21,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 11:58:21,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=1569, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 11:58:21,919 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand has 39 states, 38 states have (on average 1.9210526315789473) internal successors, (73), 37 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 11:58:24,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:24,115 INFO L93 Difference]: Finished difference Result 88 states and 93 transitions. [2021-05-06 11:58:24,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 11:58:24,115 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 1.9210526315789473) internal successors, (73), 37 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 77 [2021-05-06 11:58:24,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:24,116 INFO L225 Difference]: With dead ends: 88 [2021-05-06 11:58:24,116 INFO L226 Difference]: Without dead ends: 81 [2021-05-06 11:58:24,116 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 860 ImplicationChecksByTransitivity, 2135.6ms TimeCoverageRelationStatistics Valid=389, Invalid=5311, Unknown=0, NotChecked=0, Total=5700 [2021-05-06 11:58:24,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-05-06 11:58:24,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2021-05-06 11:58:24,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 76 states have (on average 1.0526315789473684) internal successors, (80), 76 states have internal predecessors, (80), 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 11:58:24,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2021-05-06 11:58:24,123 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 77 [2021-05-06 11:58:24,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:24,123 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2021-05-06 11:58:24,124 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 38 states have (on average 1.9210526315789473) internal successors, (73), 37 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 11:58:24,124 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2021-05-06 11:58:24,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 11:58:24,124 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:24,124 INFO L523 BasicCegarLoop]: trace histogram [34, 32, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:24,124 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable94 [2021-05-06 11:58:24,124 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:24,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:24,124 INFO L82 PathProgramCache]: Analyzing trace with hash -1444197219, now seen corresponding path program 32 times [2021-05-06 11:58:24,125 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:24,125 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1710074618] [2021-05-06 11:58:24,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:24,131 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:24,131 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:24,133 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:24,140 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:24,142 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:24,156 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:24,168 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:24,171 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:58:24,171 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:24,175 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:24,182 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:58:24,188 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:24,189 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:24,190 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:58:24,194 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:24,198 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:24,202 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:58:24,208 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:24,217 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:24,227 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:24,230 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:24,238 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:24,240 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:24,247 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:24,259 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:24,260 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:24,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:24,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:24,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:24,336 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 11:58:24,338 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:25,254 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:25,254 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1710074618] [2021-05-06 11:58:25,254 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1710074618] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:25,254 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:25,254 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2021-05-06 11:58:25,254 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033939415] [2021-05-06 11:58:25,254 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-06 11:58:25,254 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:25,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-06 11:58:25,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=1649, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 11:58:25,255 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand has 40 states, 39 states have (on average 1.9230769230769231) internal successors, (75), 38 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 11:58:27,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:27,624 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2021-05-06 11:58:27,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 11:58:27,624 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 39 states have (on average 1.9230769230769231) internal successors, (75), 38 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 79 [2021-05-06 11:58:27,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:27,625 INFO L225 Difference]: With dead ends: 90 [2021-05-06 11:58:27,625 INFO L226 Difference]: Without dead ends: 83 [2021-05-06 11:58:27,625 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 903 ImplicationChecksByTransitivity, 2290.2ms TimeCoverageRelationStatistics Valid=400, Invalid=5606, Unknown=0, NotChecked=0, Total=6006 [2021-05-06 11:58:27,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-06 11:58:27,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-05-06 11:58:27,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.0512820512820513) internal successors, (82), 78 states have internal predecessors, (82), 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 11:58:27,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2021-05-06 11:58:27,633 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 79 [2021-05-06 11:58:27,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:27,633 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2021-05-06 11:58:27,633 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 39 states have (on average 1.9230769230769231) internal successors, (75), 38 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 11:58:27,633 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2021-05-06 11:58:27,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-06 11:58:27,633 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:27,633 INFO L523 BasicCegarLoop]: trace histogram [35, 33, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:27,634 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable97 [2021-05-06 11:58:27,634 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:27,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:27,634 INFO L82 PathProgramCache]: Analyzing trace with hash -362657992, now seen corresponding path program 33 times [2021-05-06 11:58:27,634 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:27,634 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [148586950] [2021-05-06 11:58:27,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:27,641 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:27,650 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:27,652 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:27,662 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:27,663 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:27,671 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:27,683 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:27,685 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:58:27,685 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:27,689 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:27,696 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:58:27,703 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:27,703 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:27,705 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:58:27,705 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:27,712 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:27,719 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:58:27,726 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:27,729 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:27,738 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:27,740 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:27,746 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:27,748 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:27,766 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:27,778 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:27,779 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:27,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:27,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:27,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:27,854 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 11:58:27,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:28,820 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:28,820 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [148586950] [2021-05-06 11:58:28,821 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [148586950] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:28,821 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:28,821 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 11:58:28,821 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [516171046] [2021-05-06 11:58:28,821 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 11:58:28,821 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:28,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 11:58:28,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=1731, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 11:58:28,821 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand has 41 states, 40 states have (on average 1.925) internal successors, (77), 39 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 11:58:31,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:31,323 INFO L93 Difference]: Finished difference Result 92 states and 97 transitions. [2021-05-06 11:58:31,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 11:58:31,324 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 1.925) internal successors, (77), 39 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 81 [2021-05-06 11:58:31,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:31,324 INFO L225 Difference]: With dead ends: 92 [2021-05-06 11:58:31,324 INFO L226 Difference]: Without dead ends: 85 [2021-05-06 11:58:31,325 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 947 ImplicationChecksByTransitivity, 2345.9ms TimeCoverageRelationStatistics Valid=411, Invalid=5909, Unknown=0, NotChecked=0, Total=6320 [2021-05-06 11:58:31,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-06 11:58:31,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2021-05-06 11:58:31,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.05) internal successors, (84), 80 states have internal predecessors, (84), 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 11:58:31,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2021-05-06 11:58:31,343 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 81 [2021-05-06 11:58:31,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:31,343 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2021-05-06 11:58:31,343 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 40 states have (on average 1.925) internal successors, (77), 39 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 11:58:31,343 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2021-05-06 11:58:31,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-06 11:58:31,344 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:31,344 INFO L523 BasicCegarLoop]: trace histogram [36, 34, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:31,344 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable100 [2021-05-06 11:58:31,344 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:31,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:31,344 INFO L82 PathProgramCache]: Analyzing trace with hash -385546477, now seen corresponding path program 34 times [2021-05-06 11:58:31,345 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:31,345 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [579122923] [2021-05-06 11:58:31,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:31,352 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:31,353 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:31,354 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:31,362 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:31,364 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:31,379 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:31,391 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:31,405 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:58:31,405 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:31,409 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:31,417 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:58:31,423 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:31,424 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:31,425 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:58:31,426 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:31,429 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:31,436 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:58:31,443 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:31,445 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:31,454 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:31,455 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:31,463 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:31,464 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:31,472 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:31,484 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:31,485 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:31,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:31,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:31,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:31,556 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 11:58:31,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:32,552 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:32,552 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [579122923] [2021-05-06 11:58:32,552 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [579122923] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:32,552 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:32,552 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-06 11:58:32,552 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291241509] [2021-05-06 11:58:32,552 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 11:58:32,553 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:32,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 11:58:32,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=1815, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 11:58:32,553 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand has 42 states, 41 states have (on average 1.9268292682926829) internal successors, (79), 40 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 11:58:35,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:35,164 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2021-05-06 11:58:35,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 11:58:35,165 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 41 states have (on average 1.9268292682926829) internal successors, (79), 40 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 83 [2021-05-06 11:58:35,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:35,165 INFO L225 Difference]: With dead ends: 94 [2021-05-06 11:58:35,165 INFO L226 Difference]: Without dead ends: 87 [2021-05-06 11:58:35,166 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 992 ImplicationChecksByTransitivity, 2484.3ms TimeCoverageRelationStatistics Valid=422, Invalid=6220, Unknown=0, NotChecked=0, Total=6642 [2021-05-06 11:58:35,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-06 11:58:35,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2021-05-06 11:58:35,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.048780487804878) internal successors, (86), 82 states have internal predecessors, (86), 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 11:58:35,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2021-05-06 11:58:35,171 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 83 [2021-05-06 11:58:35,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:35,172 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2021-05-06 11:58:35,172 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 41 states have (on average 1.9268292682926829) internal successors, (79), 40 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 11:58:35,172 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2021-05-06 11:58:35,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 11:58:35,172 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:35,172 INFO L523 BasicCegarLoop]: trace histogram [37, 35, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:35,172 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable103 [2021-05-06 11:58:35,172 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:35,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:35,173 INFO L82 PathProgramCache]: Analyzing trace with hash -906544082, now seen corresponding path program 35 times [2021-05-06 11:58:35,173 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:35,173 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1778934059] [2021-05-06 11:58:35,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:35,183 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:35,183 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:35,185 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:35,193 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:35,194 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:35,208 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:35,220 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:35,223 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:58:35,223 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:35,227 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:35,234 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:58:35,240 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:35,241 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:35,242 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:58:35,243 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:35,246 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:35,254 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:58:35,260 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:35,263 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:35,263 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:35,264 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:35,271 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:35,273 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:35,287 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:35,299 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:35,300 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:35,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:35,377 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:35,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:35,380 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 11:58:35,382 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:36,489 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:36,489 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1778934059] [2021-05-06 11:58:36,489 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1778934059] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:36,489 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:36,489 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-06 11:58:36,489 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686135924] [2021-05-06 11:58:36,489 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-06 11:58:36,489 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:36,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-06 11:58:36,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=1901, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 11:58:36,490 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand has 43 states, 42 states have (on average 1.9285714285714286) internal successors, (81), 41 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:39,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:39,234 INFO L93 Difference]: Finished difference Result 96 states and 101 transitions. [2021-05-06 11:58:39,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 11:58:39,234 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 42 states have (on average 1.9285714285714286) internal successors, (81), 41 states have internal predecessors, (81), 2 states have call successors, (3), 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 85 [2021-05-06 11:58:39,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:39,235 INFO L225 Difference]: With dead ends: 96 [2021-05-06 11:58:39,235 INFO L226 Difference]: Without dead ends: 89 [2021-05-06 11:58:39,235 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1038 ImplicationChecksByTransitivity, 2633.9ms TimeCoverageRelationStatistics Valid=433, Invalid=6539, Unknown=0, NotChecked=0, Total=6972 [2021-05-06 11:58:39,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-06 11:58:39,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-05-06 11:58:39,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 84 states have (on average 1.0476190476190477) internal successors, (88), 84 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 11:58:39,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2021-05-06 11:58:39,243 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 85 [2021-05-06 11:58:39,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:39,244 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2021-05-06 11:58:39,244 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 42 states have (on average 1.9285714285714286) internal successors, (81), 41 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:39,244 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2021-05-06 11:58:39,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-05-06 11:58:39,244 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:39,244 INFO L523 BasicCegarLoop]: trace histogram [38, 36, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:39,244 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable106 [2021-05-06 11:58:39,244 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:39,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:39,245 INFO L82 PathProgramCache]: Analyzing trace with hash 925931145, now seen corresponding path program 36 times [2021-05-06 11:58:39,245 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:39,245 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [997397440] [2021-05-06 11:58:39,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:39,251 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:39,262 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:39,263 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:39,271 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:39,273 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:39,280 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:39,292 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:39,295 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:58:39,299 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:39,303 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:39,306 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:58:39,313 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:39,313 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:39,315 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:58:39,319 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:39,322 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:39,326 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:58:39,332 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:39,335 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:39,336 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:39,337 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:39,344 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:39,346 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:39,360 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:39,372 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:39,373 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:39,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:39,449 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:39,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:39,452 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 11:58:39,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:40,556 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:40,556 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [997397440] [2021-05-06 11:58:40,556 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [997397440] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:40,556 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:40,556 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-06 11:58:40,556 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583218743] [2021-05-06 11:58:40,556 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 11:58:40,557 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:40,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 11:58:40,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=1989, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 11:58:40,557 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand has 44 states, 43 states have (on average 1.930232558139535) internal successors, (83), 42 states have internal predecessors, (83), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:43,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:43,299 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2021-05-06 11:58:43,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-06 11:58:43,300 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 1.930232558139535) internal successors, (83), 42 states have internal predecessors, (83), 2 states have call successors, (3), 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 11:58:43,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:43,300 INFO L225 Difference]: With dead ends: 98 [2021-05-06 11:58:43,300 INFO L226 Difference]: Without dead ends: 91 [2021-05-06 11:58:43,301 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1085 ImplicationChecksByTransitivity, 2653.7ms TimeCoverageRelationStatistics Valid=444, Invalid=6866, Unknown=0, NotChecked=0, Total=7310 [2021-05-06 11:58:43,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-05-06 11:58:43,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2021-05-06 11:58:43,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.0465116279069768) internal successors, (90), 86 states have internal predecessors, (90), 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 11:58:43,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2021-05-06 11:58:43,308 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 87 [2021-05-06 11:58:43,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:43,308 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2021-05-06 11:58:43,308 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 43 states have (on average 1.930232558139535) internal successors, (83), 42 states have internal predecessors, (83), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:43,308 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2021-05-06 11:58:43,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-06 11:58:43,308 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:43,308 INFO L523 BasicCegarLoop]: trace histogram [39, 37, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:43,308 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable109 [2021-05-06 11:58:43,309 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:43,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:43,309 INFO L82 PathProgramCache]: Analyzing trace with hash 998032932, now seen corresponding path program 37 times [2021-05-06 11:58:43,309 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:43,309 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1733486479] [2021-05-06 11:58:43,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:43,315 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:43,324 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:43,325 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:43,332 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:43,333 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:43,344 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:43,356 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:43,358 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:58:43,358 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:43,362 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:43,369 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:58:43,375 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:43,376 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:43,378 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:58:43,382 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:43,386 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:43,389 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:58:43,396 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:43,399 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:43,399 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:43,400 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:43,408 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:43,410 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:43,426 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:43,438 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:43,440 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:43,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:43,513 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:43,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:43,525 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 11:58:43,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:44,610 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:44,610 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1733486479] [2021-05-06 11:58:44,611 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1733486479] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:44,611 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:44,611 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2021-05-06 11:58:44,611 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16135276] [2021-05-06 11:58:44,611 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-06 11:58:44,611 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:44,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-06 11:58:44,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=2079, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 11:58:44,611 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand has 45 states, 44 states have (on average 1.9318181818181819) internal successors, (85), 43 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:47,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:47,466 INFO L93 Difference]: Finished difference Result 100 states and 105 transitions. [2021-05-06 11:58:47,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 11:58:47,467 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 44 states have (on average 1.9318181818181819) internal successors, (85), 43 states have internal predecessors, (85), 2 states have call successors, (3), 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 89 [2021-05-06 11:58:47,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:47,467 INFO L225 Difference]: With dead ends: 100 [2021-05-06 11:58:47,467 INFO L226 Difference]: Without dead ends: 93 [2021-05-06 11:58:47,468 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1133 ImplicationChecksByTransitivity, 2694.0ms TimeCoverageRelationStatistics Valid=455, Invalid=7201, Unknown=0, NotChecked=0, Total=7656 [2021-05-06 11:58:47,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-06 11:58:47,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2021-05-06 11:58:47,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 88 states have (on average 1.0454545454545454) internal successors, (92), 88 states have internal predecessors, (92), 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 11:58:47,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2021-05-06 11:58:47,477 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 89 [2021-05-06 11:58:47,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:47,477 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2021-05-06 11:58:47,477 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 44 states have (on average 1.9318181818181819) internal successors, (85), 43 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:47,477 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2021-05-06 11:58:47,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-06 11:58:47,478 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:47,478 INFO L523 BasicCegarLoop]: trace histogram [40, 38, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:47,478 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable112 [2021-05-06 11:58:47,478 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:47,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:47,478 INFO L82 PathProgramCache]: Analyzing trace with hash 1568373503, now seen corresponding path program 38 times [2021-05-06 11:58:47,478 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:47,478 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1979154491] [2021-05-06 11:58:47,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:47,486 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:47,496 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:47,498 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:47,504 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:47,506 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:47,513 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:47,525 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:47,527 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:58:47,532 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:47,535 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:47,539 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:58:47,545 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:47,546 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:47,548 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:58:47,552 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:47,555 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:47,559 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:58:47,565 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:47,568 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:47,568 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:47,569 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:47,576 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:47,578 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:47,592 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:47,604 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:47,604 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:47,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:47,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:47,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:47,689 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 11:58:47,691 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:48,819 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:48,819 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1979154491] [2021-05-06 11:58:48,819 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1979154491] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:48,819 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:48,819 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2021-05-06 11:58:48,819 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499236379] [2021-05-06 11:58:48,820 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-06 11:58:48,820 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:48,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-06 11:58:48,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=2171, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 11:58:48,820 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand has 46 states, 45 states have (on average 1.9333333333333333) internal successors, (87), 44 states have internal predecessors, (87), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:51,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:51,887 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2021-05-06 11:58:51,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-06 11:58:51,888 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 1.9333333333333333) internal successors, (87), 44 states have internal predecessors, (87), 2 states have call successors, (3), 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 11:58:51,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:51,889 INFO L225 Difference]: With dead ends: 102 [2021-05-06 11:58:51,889 INFO L226 Difference]: Without dead ends: 95 [2021-05-06 11:58:51,889 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1182 ImplicationChecksByTransitivity, 2845.0ms TimeCoverageRelationStatistics Valid=466, Invalid=7544, Unknown=0, NotChecked=0, Total=8010 [2021-05-06 11:58:51,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-06 11:58:51,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2021-05-06 11:58:51,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 90 states have (on average 1.0444444444444445) internal successors, (94), 90 states have internal predecessors, (94), 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 11:58:51,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2021-05-06 11:58:51,898 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 91 [2021-05-06 11:58:51,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:51,898 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2021-05-06 11:58:51,899 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 45 states have (on average 1.9333333333333333) internal successors, (87), 44 states have internal predecessors, (87), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:51,899 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2021-05-06 11:58:51,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-06 11:58:51,899 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:51,899 INFO L523 BasicCegarLoop]: trace histogram [41, 39, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:51,899 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable115 [2021-05-06 11:58:51,899 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:51,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:51,900 INFO L82 PathProgramCache]: Analyzing trace with hash -90151654, now seen corresponding path program 39 times [2021-05-06 11:58:51,900 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:51,900 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1857911482] [2021-05-06 11:58:51,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:51,907 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:51,916 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:51,918 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:51,925 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:51,927 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:51,934 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:51,946 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:51,951 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:58:51,951 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:51,955 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:51,962 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:58:51,969 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:51,969 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:51,971 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:58:51,971 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:51,975 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:51,983 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:58:51,989 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:51,992 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:51,992 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:51,994 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:52,000 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:52,002 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:52,022 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:52,034 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:52,035 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:52,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:52,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:52,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:52,117 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 11:58:52,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:53,330 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:53,331 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1857911482] [2021-05-06 11:58:53,331 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1857911482] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:53,331 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:53,331 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2021-05-06 11:58:53,331 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13510883] [2021-05-06 11:58:53,331 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-06 11:58:53,331 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:53,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-06 11:58:53,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=2265, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 11:58:53,332 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand has 47 states, 46 states have (on average 1.934782608695652) internal successors, (89), 45 states have internal predecessors, (89), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:56,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:56,674 INFO L93 Difference]: Finished difference Result 104 states and 109 transitions. [2021-05-06 11:58:56,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-06 11:58:56,674 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 46 states have (on average 1.934782608695652) internal successors, (89), 45 states have internal predecessors, (89), 2 states have call successors, (3), 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 93 [2021-05-06 11:58:56,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:56,675 INFO L225 Difference]: With dead ends: 104 [2021-05-06 11:58:56,675 INFO L226 Difference]: Without dead ends: 97 [2021-05-06 11:58:56,675 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1232 ImplicationChecksByTransitivity, 3047.7ms TimeCoverageRelationStatistics Valid=477, Invalid=7895, Unknown=0, NotChecked=0, Total=8372 [2021-05-06 11:58:56,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-05-06 11:58:56,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2021-05-06 11:58:56,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 92 states have (on average 1.0434782608695652) internal successors, (96), 92 states have internal predecessors, (96), 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 11:58:56,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2021-05-06 11:58:56,683 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 93 [2021-05-06 11:58:56,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:56,683 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2021-05-06 11:58:56,683 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 46 states have (on average 1.934782608695652) internal successors, (89), 45 states have internal predecessors, (89), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:56,683 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2021-05-06 11:58:56,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-06 11:58:56,683 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:56,684 INFO L523 BasicCegarLoop]: trace histogram [42, 40, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:56,684 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable118 [2021-05-06 11:58:56,684 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:56,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:56,684 INFO L82 PathProgramCache]: Analyzing trace with hash -499960715, now seen corresponding path program 40 times [2021-05-06 11:58:56,684 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:56,684 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1822473148] [2021-05-06 11:58:56,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:56,692 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:56,701 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:56,703 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:56,711 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:56,713 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:56,721 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:56,733 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:56,735 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:58:56,740 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:56,744 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:56,748 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:58:56,755 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:56,756 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:56,757 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:58:56,762 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:56,773 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:56,778 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:58:56,784 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:56,787 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:58:56,797 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:56,798 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:56,805 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:56,807 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:56,815 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:58:56,827 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:56,828 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:56,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:56,899 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:56,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:56,909 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 11:58:56,911 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:58,154 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:58,154 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1822473148] [2021-05-06 11:58:58,154 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1822473148] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:58,155 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:58,155 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2021-05-06 11:58:58,155 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [848257611] [2021-05-06 11:58:58,155 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-06 11:58:58,155 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:58,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-06 11:58:58,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=2361, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 11:58:58,156 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand has 48 states, 47 states have (on average 1.9361702127659575) internal successors, (91), 46 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:01,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:01,630 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2021-05-06 11:59:01,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-06 11:59:01,630 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 1.9361702127659575) internal successors, (91), 46 states have internal predecessors, (91), 2 states have call successors, (3), 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 11:59:01,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:01,631 INFO L225 Difference]: With dead ends: 106 [2021-05-06 11:59:01,631 INFO L226 Difference]: Without dead ends: 99 [2021-05-06 11:59:01,631 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1283 ImplicationChecksByTransitivity, 3055.2ms TimeCoverageRelationStatistics Valid=488, Invalid=8254, Unknown=0, NotChecked=0, Total=8742 [2021-05-06 11:59:01,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-05-06 11:59:01,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2021-05-06 11:59:01,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 94 states have (on average 1.0425531914893618) internal successors, (98), 94 states have internal predecessors, (98), 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 11:59:01,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2021-05-06 11:59:01,638 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 95 [2021-05-06 11:59:01,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:01,638 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2021-05-06 11:59:01,638 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 47 states have (on average 1.9361702127659575) internal successors, (91), 46 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:01,638 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2021-05-06 11:59:01,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-06 11:59:01,638 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:01,639 INFO L523 BasicCegarLoop]: trace histogram [43, 41, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:01,639 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable121 [2021-05-06 11:59:01,639 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:01,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:01,639 INFO L82 PathProgramCache]: Analyzing trace with hash 810522896, now seen corresponding path program 41 times [2021-05-06 11:59:01,639 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:01,639 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [633839526] [2021-05-06 11:59:01,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:01,648 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:59:01,657 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:01,658 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:01,665 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:01,667 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:01,674 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:59:01,686 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:01,688 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:59:01,692 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:01,696 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:01,700 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:59:01,706 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:01,706 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:01,708 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:59:01,713 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:01,718 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:01,722 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:59:01,728 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:01,732 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:59:01,732 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:01,733 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:01,741 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:01,742 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:01,757 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:59:01,769 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:01,770 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:01,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:01,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:01,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:01,834 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 11:59:01,835 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:03,107 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:03,107 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [633839526] [2021-05-06 11:59:03,107 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [633839526] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:03,107 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:03,107 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2021-05-06 11:59:03,108 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329845683] [2021-05-06 11:59:03,108 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-06 11:59:03,108 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:03,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-06 11:59:03,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=2459, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 11:59:03,108 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand has 49 states, 48 states have (on average 1.9375) internal successors, (93), 47 states have internal predecessors, (93), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:06,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:06,607 INFO L93 Difference]: Finished difference Result 108 states and 113 transitions. [2021-05-06 11:59:06,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-06 11:59:06,608 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 1.9375) internal successors, (93), 47 states have internal predecessors, (93), 2 states have call successors, (3), 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 97 [2021-05-06 11:59:06,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:06,608 INFO L225 Difference]: With dead ends: 108 [2021-05-06 11:59:06,608 INFO L226 Difference]: Without dead ends: 101 [2021-05-06 11:59:06,609 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1335 ImplicationChecksByTransitivity, 3168.5ms TimeCoverageRelationStatistics Valid=499, Invalid=8621, Unknown=0, NotChecked=0, Total=9120 [2021-05-06 11:59:06,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-05-06 11:59:06,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2021-05-06 11:59:06,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 96 states have (on average 1.0416666666666667) internal successors, (100), 96 states have internal predecessors, (100), 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 11:59:06,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2021-05-06 11:59:06,615 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 97 [2021-05-06 11:59:06,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:06,616 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2021-05-06 11:59:06,616 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 48 states have (on average 1.9375) internal successors, (93), 47 states have internal predecessors, (93), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:06,616 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2021-05-06 11:59:06,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-06 11:59:06,616 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:06,616 INFO L523 BasicCegarLoop]: trace histogram [44, 42, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:06,616 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable124 [2021-05-06 11:59:06,616 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:06,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:06,617 INFO L82 PathProgramCache]: Analyzing trace with hash 1759855339, now seen corresponding path program 42 times [2021-05-06 11:59:06,617 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:06,617 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1845408661] [2021-05-06 11:59:06,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:06,628 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:59:06,638 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:06,640 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:06,648 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:06,650 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:06,658 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:59:06,672 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:06,674 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:59:06,680 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:06,684 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:06,690 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:59:06,697 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:06,698 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:06,699 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:59:06,704 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:06,708 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:06,713 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:59:06,720 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:06,725 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:59:06,735 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:06,737 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:06,745 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:06,747 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:06,755 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:59:06,768 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:06,769 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:06,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:06,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:06,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:06,863 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 11:59:06,864 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:08,314 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:08,315 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1845408661] [2021-05-06 11:59:08,315 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1845408661] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:08,315 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:08,315 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2021-05-06 11:59:08,315 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668334383] [2021-05-06 11:59:08,315 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-06 11:59:08,315 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:08,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-06 11:59:08,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=2559, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 11:59:08,316 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand has 50 states, 49 states have (on average 1.9387755102040816) internal successors, (95), 48 states have internal predecessors, (95), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:11,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:11,891 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2021-05-06 11:59:11,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-06 11:59:11,892 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 49 states have (on average 1.9387755102040816) internal successors, (95), 48 states have internal predecessors, (95), 2 states have call successors, (3), 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 11:59:11,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:11,892 INFO L225 Difference]: With dead ends: 110 [2021-05-06 11:59:11,892 INFO L226 Difference]: Without dead ends: 103 [2021-05-06 11:59:11,893 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1388 ImplicationChecksByTransitivity, 3407.1ms TimeCoverageRelationStatistics Valid=510, Invalid=8996, Unknown=0, NotChecked=0, Total=9506 [2021-05-06 11:59:11,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-05-06 11:59:11,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-05-06 11:59:11,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.0408163265306123) internal successors, (102), 98 states have internal predecessors, (102), 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 11:59:11,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2021-05-06 11:59:11,900 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 99 [2021-05-06 11:59:11,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:11,900 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2021-05-06 11:59:11,900 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 49 states have (on average 1.9387755102040816) internal successors, (95), 48 states have internal predecessors, (95), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:11,900 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2021-05-06 11:59:11,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-06 11:59:11,901 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:11,901 INFO L523 BasicCegarLoop]: trace histogram [45, 43, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:11,901 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable127 [2021-05-06 11:59:11,901 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:11,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:11,901 INFO L82 PathProgramCache]: Analyzing trace with hash -759700986, now seen corresponding path program 43 times [2021-05-06 11:59:11,901 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:11,901 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1343932032] [2021-05-06 11:59:11,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:11,910 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:59:11,921 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:11,922 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:11,931 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:11,933 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:11,941 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:59:11,955 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:11,958 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:59:11,963 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:11,966 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:11,971 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:59:11,978 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:11,978 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:11,980 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:59:11,985 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:11,989 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:11,994 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:59:12,001 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:12,012 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:59:12,022 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:12,024 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:12,034 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:12,036 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:12,043 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:59:12,055 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:12,056 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:12,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:12,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:12,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:12,127 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 11:59:12,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:13,494 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:13,494 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1343932032] [2021-05-06 11:59:13,494 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1343932032] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:13,495 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:13,495 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2021-05-06 11:59:13,495 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655918777] [2021-05-06 11:59:13,495 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-06 11:59:13,495 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:13,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-06 11:59:13,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=2661, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 11:59:13,495 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand has 51 states, 50 states have (on average 1.94) internal successors, (97), 49 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:17,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:17,131 INFO L93 Difference]: Finished difference Result 112 states and 117 transitions. [2021-05-06 11:59:17,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 11:59:17,132 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 50 states have (on average 1.94) internal successors, (97), 49 states have internal predecessors, (97), 2 states have call successors, (3), 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 11:59:17,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:17,132 INFO L225 Difference]: With dead ends: 112 [2021-05-06 11:59:17,132 INFO L226 Difference]: Without dead ends: 105 [2021-05-06 11:59:17,133 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1442 ImplicationChecksByTransitivity, 3375.9ms TimeCoverageRelationStatistics Valid=521, Invalid=9379, Unknown=0, NotChecked=0, Total=9900 [2021-05-06 11:59:17,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-05-06 11:59:17,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2021-05-06 11:59:17,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 100 states have (on average 1.04) internal successors, (104), 100 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 11:59:17,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2021-05-06 11:59:17,143 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 101 [2021-05-06 11:59:17,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:17,144 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2021-05-06 11:59:17,144 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 50 states have (on average 1.94) internal successors, (97), 49 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:17,144 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2021-05-06 11:59:17,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-05-06 11:59:17,144 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:17,144 INFO L523 BasicCegarLoop]: trace histogram [46, 44, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:17,144 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable130 [2021-05-06 11:59:17,145 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:17,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:17,145 INFO L82 PathProgramCache]: Analyzing trace with hash 308225633, now seen corresponding path program 44 times [2021-05-06 11:59:17,145 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:17,145 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [157075090] [2021-05-06 11:59:17,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:17,156 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:59:17,167 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:17,169 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:17,176 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:17,178 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:17,186 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:59:17,199 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:17,201 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:59:17,201 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:17,205 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:17,216 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:59:17,222 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:17,223 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:17,224 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:59:17,225 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:17,228 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:17,237 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:59:17,244 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:17,247 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:59:17,255 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:17,257 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:17,263 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:17,265 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:17,272 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:59:17,284 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:17,285 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:17,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:17,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:17,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:17,370 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 11:59:17,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:18,792 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:18,792 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [157075090] [2021-05-06 11:59:18,792 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [157075090] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:18,792 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:18,792 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2021-05-06 11:59:18,793 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [578932221] [2021-05-06 11:59:18,793 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-06 11:59:18,793 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:18,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-06 11:59:18,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=2765, Unknown=0, NotChecked=0, Total=2970 [2021-05-06 11:59:18,793 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand has 52 states, 51 states have (on average 1.9411764705882353) internal successors, (99), 50 states have internal predecessors, (99), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:22,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:22,677 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2021-05-06 11:59:22,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-06 11:59:22,678 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 51 states have (on average 1.9411764705882353) internal successors, (99), 50 states have internal predecessors, (99), 2 states have call successors, (3), 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 103 [2021-05-06 11:59:22,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:22,678 INFO L225 Difference]: With dead ends: 114 [2021-05-06 11:59:22,678 INFO L226 Difference]: Without dead ends: 107 [2021-05-06 11:59:22,679 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1497 ImplicationChecksByTransitivity, 3555.7ms TimeCoverageRelationStatistics Valid=532, Invalid=9770, Unknown=0, NotChecked=0, Total=10302 [2021-05-06 11:59:22,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-05-06 11:59:22,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2021-05-06 11:59:22,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 102 states have (on average 1.0392156862745099) internal successors, (106), 102 states have internal predecessors, (106), 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 11:59:22,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2021-05-06 11:59:22,690 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 103 [2021-05-06 11:59:22,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:22,690 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2021-05-06 11:59:22,690 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 51 states have (on average 1.9411764705882353) internal successors, (99), 50 states have internal predecessors, (99), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:22,690 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2021-05-06 11:59:22,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-06 11:59:22,691 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:22,691 INFO L523 BasicCegarLoop]: trace histogram [47, 45, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:22,691 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable133 [2021-05-06 11:59:22,691 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:22,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:22,691 INFO L82 PathProgramCache]: Analyzing trace with hash 88522748, now seen corresponding path program 45 times [2021-05-06 11:59:22,691 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:22,691 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1102955247] [2021-05-06 11:59:22,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:22,699 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:59:22,709 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:22,711 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:22,719 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:22,721 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:22,730 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:59:22,743 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:22,746 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:59:22,747 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:22,751 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:22,759 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:59:22,766 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:22,767 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:22,778 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:59:22,779 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:22,783 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:22,793 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:59:22,800 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:22,804 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:59:22,805 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:22,806 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:22,815 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:22,818 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:22,834 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:59:22,847 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:22,848 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:22,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:22,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:22,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:22,929 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 11:59:22,931 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:24,427 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:24,427 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1102955247] [2021-05-06 11:59:24,427 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1102955247] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:24,427 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:24,427 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2021-05-06 11:59:24,427 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936550390] [2021-05-06 11:59:24,427 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-06 11:59:24,427 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:24,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-06 11:59:24,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=2871, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 11:59:24,428 INFO L87 Difference]: Start difference. First operand 107 states and 110 transitions. Second operand has 53 states, 52 states have (on average 1.9423076923076923) internal successors, (101), 51 states have internal predecessors, (101), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:28,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:28,367 INFO L93 Difference]: Finished difference Result 116 states and 121 transitions. [2021-05-06 11:59:28,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-06 11:59:28,367 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 52 states have (on average 1.9423076923076923) internal successors, (101), 51 states have internal predecessors, (101), 2 states have call successors, (3), 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 105 [2021-05-06 11:59:28,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:28,368 INFO L225 Difference]: With dead ends: 116 [2021-05-06 11:59:28,368 INFO L226 Difference]: Without dead ends: 109 [2021-05-06 11:59:28,369 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1553 ImplicationChecksByTransitivity, 3656.8ms TimeCoverageRelationStatistics Valid=543, Invalid=10169, Unknown=0, NotChecked=0, Total=10712 [2021-05-06 11:59:28,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-06 11:59:28,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2021-05-06 11:59:28,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.0384615384615385) internal successors, (108), 104 states have internal predecessors, (108), 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 11:59:28,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 112 transitions. [2021-05-06 11:59:28,378 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 112 transitions. Word has length 105 [2021-05-06 11:59:28,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:28,378 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 112 transitions. [2021-05-06 11:59:28,378 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 52 states have (on average 1.9423076923076923) internal successors, (101), 51 states have internal predecessors, (101), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:28,378 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 112 transitions. [2021-05-06 11:59:28,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-06 11:59:28,379 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:28,379 INFO L523 BasicCegarLoop]: trace histogram [48, 46, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:28,379 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable136 [2021-05-06 11:59:28,379 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:28,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:28,379 INFO L82 PathProgramCache]: Analyzing trace with hash -592552233, now seen corresponding path program 46 times [2021-05-06 11:59:28,379 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:28,379 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1689680629] [2021-05-06 11:59:28,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:28,386 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:59:28,396 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:28,398 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:28,404 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:28,406 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:28,414 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:59:28,427 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:28,429 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:59:28,430 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:28,433 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:28,441 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:59:28,448 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:28,449 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:28,450 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:59:28,454 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:28,458 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:28,462 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:59:28,469 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:28,471 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:59:28,481 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:28,482 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:28,489 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:28,491 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:28,498 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:59:28,510 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:28,510 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:28,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:28,578 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:28,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:28,588 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 11:59:28,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:30,163 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:30,163 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1689680629] [2021-05-06 11:59:30,163 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1689680629] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:30,163 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:30,163 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2021-05-06 11:59:30,164 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844694975] [2021-05-06 11:59:30,164 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-06 11:59:30,164 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:30,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-06 11:59:30,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=2979, Unknown=0, NotChecked=0, Total=3192 [2021-05-06 11:59:30,164 INFO L87 Difference]: Start difference. First operand 109 states and 112 transitions. Second operand has 54 states, 53 states have (on average 1.9433962264150944) internal successors, (103), 52 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:34,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:34,252 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2021-05-06 11:59:34,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-06 11:59:34,252 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 53 states have (on average 1.9433962264150944) internal successors, (103), 52 states have internal predecessors, (103), 2 states have call successors, (3), 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 107 [2021-05-06 11:59:34,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:34,253 INFO L225 Difference]: With dead ends: 118 [2021-05-06 11:59:34,253 INFO L226 Difference]: Without dead ends: 111 [2021-05-06 11:59:34,254 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1610 ImplicationChecksByTransitivity, 3771.1ms TimeCoverageRelationStatistics Valid=554, Invalid=10576, Unknown=0, NotChecked=0, Total=11130 [2021-05-06 11:59:34,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-05-06 11:59:34,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2021-05-06 11:59:34,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 106 states have (on average 1.0377358490566038) internal successors, (110), 106 states have internal predecessors, (110), 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 11:59:34,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 114 transitions. [2021-05-06 11:59:34,265 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 114 transitions. Word has length 107 [2021-05-06 11:59:34,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:34,265 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 114 transitions. [2021-05-06 11:59:34,265 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 53 states have (on average 1.9433962264150944) internal successors, (103), 52 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:34,265 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 114 transitions. [2021-05-06 11:59:34,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-05-06 11:59:34,266 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:34,266 INFO L523 BasicCegarLoop]: trace histogram [49, 47, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:34,266 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable139 [2021-05-06 11:59:34,266 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:34,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:34,266 INFO L82 PathProgramCache]: Analyzing trace with hash 2024387314, now seen corresponding path program 47 times [2021-05-06 11:59:34,267 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:34,267 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [868091097] [2021-05-06 11:59:34,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:34,274 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:59:34,286 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:34,287 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:34,296 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:34,299 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:34,308 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:59:34,323 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:34,326 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:59:34,326 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:34,331 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:34,340 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:59:34,347 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:34,348 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:34,350 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:59:34,356 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:34,360 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:34,365 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:59:34,373 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:34,377 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:59:34,388 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:34,390 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:34,400 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:34,402 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:34,411 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:59:34,426 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:34,427 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:34,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:34,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:34,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:34,509 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 11:59:34,510 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:36,164 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:36,164 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [868091097] [2021-05-06 11:59:36,164 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [868091097] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:36,164 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:36,164 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [55] imperfect sequences [] total 55 [2021-05-06 11:59:36,164 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660483056] [2021-05-06 11:59:36,165 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-06 11:59:36,165 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:36,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-06 11:59:36,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=3089, Unknown=0, NotChecked=0, Total=3306 [2021-05-06 11:59:36,168 INFO L87 Difference]: Start difference. First operand 111 states and 114 transitions. Second operand has 55 states, 54 states have (on average 1.9444444444444444) internal successors, (105), 53 states have internal predecessors, (105), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:40,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:40,663 INFO L93 Difference]: Finished difference Result 120 states and 125 transitions. [2021-05-06 11:59:40,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-06 11:59:40,664 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 54 states have (on average 1.9444444444444444) internal successors, (105), 53 states have internal predecessors, (105), 2 states have call successors, (3), 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 109 [2021-05-06 11:59:40,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:40,665 INFO L225 Difference]: With dead ends: 120 [2021-05-06 11:59:40,665 INFO L226 Difference]: Without dead ends: 113 [2021-05-06 11:59:40,665 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1668 ImplicationChecksByTransitivity, 3986.8ms TimeCoverageRelationStatistics Valid=565, Invalid=10991, Unknown=0, NotChecked=0, Total=11556 [2021-05-06 11:59:40,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-05-06 11:59:40,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2021-05-06 11:59:40,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 108 states have (on average 1.037037037037037) internal successors, (112), 108 states have internal predecessors, (112), 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 11:59:40,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 116 transitions. [2021-05-06 11:59:40,677 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 116 transitions. Word has length 109 [2021-05-06 11:59:40,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:40,677 INFO L480 AbstractCegarLoop]: Abstraction has 113 states and 116 transitions. [2021-05-06 11:59:40,677 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 54 states have (on average 1.9444444444444444) internal successors, (105), 53 states have internal predecessors, (105), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:40,677 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 116 transitions. [2021-05-06 11:59:40,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-05-06 11:59:40,678 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:40,678 INFO L523 BasicCegarLoop]: trace histogram [50, 48, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:40,678 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable142 [2021-05-06 11:59:40,678 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:40,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:40,679 INFO L82 PathProgramCache]: Analyzing trace with hash 52456525, now seen corresponding path program 48 times [2021-05-06 11:59:40,679 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:40,679 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1031668723] [2021-05-06 11:59:40,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:40,686 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:59:40,686 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:40,688 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:40,697 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:40,700 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:40,717 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:59:40,731 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:40,734 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:59:40,735 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:40,739 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:40,748 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:59:40,755 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:40,756 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:40,757 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:59:40,762 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:40,767 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:40,771 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:59:40,778 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:40,787 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:59:40,798 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:40,799 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:40,808 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:40,810 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:40,819 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:59:40,833 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:40,834 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:40,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:40,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:40,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:40,911 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 11:59:40,912 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:42,579 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:42,579 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1031668723] [2021-05-06 11:59:42,579 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1031668723] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:42,579 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:42,579 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [56] imperfect sequences [] total 56 [2021-05-06 11:59:42,579 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606919061] [2021-05-06 11:59:42,579 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-06 11:59:42,579 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:42,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-06 11:59:42,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=3201, Unknown=0, NotChecked=0, Total=3422 [2021-05-06 11:59:42,580 INFO L87 Difference]: Start difference. First operand 113 states and 116 transitions. Second operand has 56 states, 55 states have (on average 1.9454545454545455) internal successors, (107), 54 states have internal predecessors, (107), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:47,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:47,051 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2021-05-06 11:59:47,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-06 11:59:47,051 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 55 states have (on average 1.9454545454545455) internal successors, (107), 54 states have internal predecessors, (107), 2 states have call successors, (3), 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 111 [2021-05-06 11:59:47,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:47,052 INFO L225 Difference]: With dead ends: 122 [2021-05-06 11:59:47,052 INFO L226 Difference]: Without dead ends: 115 [2021-05-06 11:59:47,053 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1727 ImplicationChecksByTransitivity, 4029.0ms TimeCoverageRelationStatistics Valid=576, Invalid=11414, Unknown=0, NotChecked=0, Total=11990 [2021-05-06 11:59:47,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-05-06 11:59:47,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2021-05-06 11:59:47,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.0363636363636364) internal successors, (114), 110 states have internal predecessors, (114), 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 11:59:47,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 118 transitions. [2021-05-06 11:59:47,064 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 118 transitions. Word has length 111 [2021-05-06 11:59:47,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:47,064 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 118 transitions. [2021-05-06 11:59:47,064 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 55 states have (on average 1.9454545454545455) internal successors, (107), 54 states have internal predecessors, (107), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:47,064 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 118 transitions. [2021-05-06 11:59:47,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-06 11:59:47,065 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:47,065 INFO L523 BasicCegarLoop]: trace histogram [51, 49, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:47,065 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable145 [2021-05-06 11:59:47,065 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:47,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:47,066 INFO L82 PathProgramCache]: Analyzing trace with hash -892454168, now seen corresponding path program 49 times [2021-05-06 11:59:47,066 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:47,066 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [993874854] [2021-05-06 11:59:47,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:47,072 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:59:47,073 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:47,075 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:47,083 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:47,085 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:47,101 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:59:47,114 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:47,117 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:59:47,118 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:47,122 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:47,130 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:59:47,137 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:47,138 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:47,140 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:59:47,141 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:47,145 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:47,153 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:59:47,161 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:47,165 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:59:47,174 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:47,175 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:47,182 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:47,183 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:47,191 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:59:47,203 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:47,204 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:47,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:47,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:47,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:47,281 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 11:59:47,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:48,965 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:48,965 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [993874854] [2021-05-06 11:59:48,965 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [993874854] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:48,965 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:48,965 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2021-05-06 11:59:48,965 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228715825] [2021-05-06 11:59:48,966 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-06 11:59:48,966 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:48,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-06 11:59:48,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=3315, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 11:59:48,966 INFO L87 Difference]: Start difference. First operand 115 states and 118 transitions. Second operand has 57 states, 56 states have (on average 1.9464285714285714) internal successors, (109), 55 states have internal predecessors, (109), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:53,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:53,607 INFO L93 Difference]: Finished difference Result 124 states and 129 transitions. [2021-05-06 11:59:53,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-06 11:59:53,607 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 56 states have (on average 1.9464285714285714) internal successors, (109), 55 states have internal predecessors, (109), 2 states have call successors, (3), 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 113 [2021-05-06 11:59:53,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:53,608 INFO L225 Difference]: With dead ends: 124 [2021-05-06 11:59:53,608 INFO L226 Difference]: Without dead ends: 117 [2021-05-06 11:59:53,608 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1787 ImplicationChecksByTransitivity, 4132.7ms TimeCoverageRelationStatistics Valid=587, Invalid=11845, Unknown=0, NotChecked=0, Total=12432 [2021-05-06 11:59:53,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-06 11:59:53,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2021-05-06 11:59:53,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 112 states have (on average 1.0357142857142858) internal successors, (116), 112 states have internal predecessors, (116), 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 11:59:53,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 120 transitions. [2021-05-06 11:59:53,616 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 120 transitions. Word has length 113 [2021-05-06 11:59:53,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:53,617 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 120 transitions. [2021-05-06 11:59:53,617 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 56 states have (on average 1.9464285714285714) internal successors, (109), 55 states have internal predecessors, (109), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:53,617 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 120 transitions. [2021-05-06 11:59:53,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-05-06 11:59:53,617 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:53,617 INFO L523 BasicCegarLoop]: trace histogram [52, 50, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:53,617 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable148 [2021-05-06 11:59:53,617 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:53,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:53,618 INFO L82 PathProgramCache]: Analyzing trace with hash 1581436611, now seen corresponding path program 50 times [2021-05-06 11:59:53,618 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:53,618 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1156273998] [2021-05-06 11:59:53,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:53,624 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:59:53,632 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:53,633 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:53,640 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:53,641 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:53,648 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:59:53,660 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:53,662 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 11:59:53,667 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:53,670 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:53,676 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 11:59:53,683 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:53,683 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:53,685 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 11:59:53,685 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:53,689 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:53,696 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 11:59:53,702 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:53,705 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 11:59:53,706 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:53,711 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:53,718 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:53,720 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:53,734 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 11:59:53,746 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:53,747 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:53,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:53,819 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:53,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:53,837 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 11:59:53,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:55,575 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:55,575 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1156273998] [2021-05-06 11:59:55,575 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1156273998] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:55,575 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:55,575 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [58] imperfect sequences [] total 58 [2021-05-06 11:59:55,575 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474287083] [2021-05-06 11:59:55,575 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-06 11:59:55,575 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:55,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-06 11:59:55,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=3431, Unknown=0, NotChecked=0, Total=3660 [2021-05-06 11:59:55,576 INFO L87 Difference]: Start difference. First operand 117 states and 120 transitions. Second operand has 58 states, 57 states have (on average 1.9473684210526316) internal successors, (111), 56 states have internal predecessors, (111), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:00,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:00,400 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2021-05-06 12:00:00,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-06 12:00:00,400 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 57 states have (on average 1.9473684210526316) internal successors, (111), 56 states have internal predecessors, (111), 2 states have call successors, (3), 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 115 [2021-05-06 12:00:00,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:00,401 INFO L225 Difference]: With dead ends: 126 [2021-05-06 12:00:00,401 INFO L226 Difference]: Without dead ends: 119 [2021-05-06 12:00:00,402 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1848 ImplicationChecksByTransitivity, 4244.8ms TimeCoverageRelationStatistics Valid=598, Invalid=12284, Unknown=0, NotChecked=0, Total=12882 [2021-05-06 12:00:00,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-05-06 12:00:00,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2021-05-06 12:00:00,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 114 states have (on average 1.0350877192982457) internal successors, (118), 114 states have internal predecessors, (118), 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 12:00:00,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 122 transitions. [2021-05-06 12:00:00,411 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 122 transitions. Word has length 115 [2021-05-06 12:00:00,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:00,411 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 122 transitions. [2021-05-06 12:00:00,411 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 57 states have (on average 1.9473684210526316) internal successors, (111), 56 states have internal predecessors, (111), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:00,411 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 122 transitions. [2021-05-06 12:00:00,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-05-06 12:00:00,412 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:00,412 INFO L523 BasicCegarLoop]: trace histogram [53, 51, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:00,412 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable151 [2021-05-06 12:00:00,412 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:00,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:00,412 INFO L82 PathProgramCache]: Analyzing trace with hash -421406754, now seen corresponding path program 51 times [2021-05-06 12:00:00,412 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:00,413 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [705244126] [2021-05-06 12:00:00,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:00,419 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:00:00,420 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:00,422 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:00,431 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:00,433 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:00,449 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:00:00,463 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:00,466 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:00:00,471 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:00,475 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:00,479 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:00:00,486 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:00,487 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:00,489 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:00:00,494 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:00,498 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:00,502 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:00:00,510 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:00,514 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:00:00,524 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:00,526 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:00,533 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:00,535 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:00,544 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:00:00,558 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:00,560 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:00,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:00,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:00,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:00,635 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 12:00:00,637 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:02,579 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:02,580 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [705244126] [2021-05-06 12:00:02,580 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [705244126] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:02,580 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:02,580 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [59] imperfect sequences [] total 59 [2021-05-06 12:00:02,580 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219795523] [2021-05-06 12:00:02,581 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-06 12:00:02,581 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:02,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-06 12:00:02,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=3549, Unknown=0, NotChecked=0, Total=3782 [2021-05-06 12:00:02,582 INFO L87 Difference]: Start difference. First operand 119 states and 122 transitions. Second operand has 59 states, 58 states have (on average 1.9482758620689655) internal successors, (113), 57 states have internal predecessors, (113), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:07,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:07,953 INFO L93 Difference]: Finished difference Result 128 states and 133 transitions. [2021-05-06 12:00:07,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-06 12:00:07,954 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 58 states have (on average 1.9482758620689655) internal successors, (113), 57 states have internal predecessors, (113), 2 states have call successors, (3), 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 117 [2021-05-06 12:00:07,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:07,957 INFO L225 Difference]: With dead ends: 128 [2021-05-06 12:00:07,957 INFO L226 Difference]: Without dead ends: 121 [2021-05-06 12:00:07,959 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1910 ImplicationChecksByTransitivity, 4705.3ms TimeCoverageRelationStatistics Valid=609, Invalid=12731, Unknown=0, NotChecked=0, Total=13340 [2021-05-06 12:00:07,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-05-06 12:00:07,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2021-05-06 12:00:07,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 116 states have (on average 1.0344827586206897) internal successors, (120), 116 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 12:00:07,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 124 transitions. [2021-05-06 12:00:07,970 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 124 transitions. Word has length 117 [2021-05-06 12:00:07,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:07,970 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 124 transitions. [2021-05-06 12:00:07,970 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 58 states have (on average 1.9482758620689655) internal successors, (113), 57 states have internal predecessors, (113), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:07,970 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 124 transitions. [2021-05-06 12:00:07,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-05-06 12:00:07,971 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:07,971 INFO L523 BasicCegarLoop]: trace histogram [54, 52, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:07,971 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable154 [2021-05-06 12:00:07,972 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:07,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:07,972 INFO L82 PathProgramCache]: Analyzing trace with hash -1008531911, now seen corresponding path program 52 times [2021-05-06 12:00:07,972 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:07,972 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1077628005] [2021-05-06 12:00:07,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:07,980 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:00:07,981 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:07,983 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:07,991 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:07,993 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:08,009 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:00:08,021 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:08,026 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:00:08,026 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:08,031 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:08,041 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:00:08,050 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:08,051 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:08,053 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:00:08,053 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:08,058 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:08,068 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:00:08,076 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:08,080 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:00:08,081 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:08,082 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:08,090 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:08,092 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:08,110 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:00:08,123 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:08,124 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:08,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:08,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:08,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:08,203 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 12:00:08,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:10,203 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:10,203 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1077628005] [2021-05-06 12:00:10,203 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1077628005] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:10,203 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:10,203 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [60] imperfect sequences [] total 60 [2021-05-06 12:00:10,203 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041570731] [2021-05-06 12:00:10,203 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-06 12:00:10,203 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:10,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-06 12:00:10,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=3669, Unknown=0, NotChecked=0, Total=3906 [2021-05-06 12:00:10,204 INFO L87 Difference]: Start difference. First operand 121 states and 124 transitions. Second operand has 60 states, 59 states have (on average 1.9491525423728813) internal successors, (115), 58 states have internal predecessors, (115), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:15,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:15,628 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2021-05-06 12:00:15,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-06 12:00:15,629 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 59 states have (on average 1.9491525423728813) internal successors, (115), 58 states have internal predecessors, (115), 2 states have call successors, (3), 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 119 [2021-05-06 12:00:15,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:15,630 INFO L225 Difference]: With dead ends: 130 [2021-05-06 12:00:15,630 INFO L226 Difference]: Without dead ends: 123 [2021-05-06 12:00:15,630 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1973 ImplicationChecksByTransitivity, 4845.2ms TimeCoverageRelationStatistics Valid=620, Invalid=13186, Unknown=0, NotChecked=0, Total=13806 [2021-05-06 12:00:15,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-05-06 12:00:15,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 123. [2021-05-06 12:00:15,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 118 states have (on average 1.0338983050847457) internal successors, (122), 118 states have internal predecessors, (122), 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 12:00:15,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 126 transitions. [2021-05-06 12:00:15,652 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 126 transitions. Word has length 119 [2021-05-06 12:00:15,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:15,652 INFO L480 AbstractCegarLoop]: Abstraction has 123 states and 126 transitions. [2021-05-06 12:00:15,652 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 59 states have (on average 1.9491525423728813) internal successors, (115), 58 states have internal predecessors, (115), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:15,653 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 126 transitions. [2021-05-06 12:00:15,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-05-06 12:00:15,663 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:15,663 INFO L523 BasicCegarLoop]: trace histogram [55, 53, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:15,663 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable157 [2021-05-06 12:00:15,663 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:15,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:15,664 INFO L82 PathProgramCache]: Analyzing trace with hash 1699875284, now seen corresponding path program 53 times [2021-05-06 12:00:15,664 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:15,664 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2089463279] [2021-05-06 12:00:15,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:15,721 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:00:15,840 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:15,849 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:15,964 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:15,992 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:16,065 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:00:16,081 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:16,097 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:00:16,106 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:16,111 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:16,116 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:00:16,124 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:16,125 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:16,128 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:00:16,128 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:16,141 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:16,155 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:00:16,167 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:16,171 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:00:16,181 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:16,182 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:16,192 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:16,194 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:16,224 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:00:16,248 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:16,257 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:16,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:16,436 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:16,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:16,457 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 12:00:16,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:18,792 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:18,792 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2089463279] [2021-05-06 12:00:18,792 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2089463279] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:18,792 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:18,792 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [61] imperfect sequences [] total 61 [2021-05-06 12:00:18,793 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683044549] [2021-05-06 12:00:18,794 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2021-05-06 12:00:18,794 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:18,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-05-06 12:00:18,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=3791, Unknown=0, NotChecked=0, Total=4032 [2021-05-06 12:00:18,794 INFO L87 Difference]: Start difference. First operand 123 states and 126 transitions. Second operand has 61 states, 60 states have (on average 1.95) internal successors, (117), 59 states have internal predecessors, (117), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:24,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:24,296 INFO L93 Difference]: Finished difference Result 132 states and 137 transitions. [2021-05-06 12:00:24,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-06 12:00:24,296 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 60 states have (on average 1.95) internal successors, (117), 59 states have internal predecessors, (117), 2 states have call successors, (3), 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 121 [2021-05-06 12:00:24,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:24,297 INFO L225 Difference]: With dead ends: 132 [2021-05-06 12:00:24,297 INFO L226 Difference]: Without dead ends: 125 [2021-05-06 12:00:24,298 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2037 ImplicationChecksByTransitivity, 5264.6ms TimeCoverageRelationStatistics Valid=631, Invalid=13649, Unknown=0, NotChecked=0, Total=14280 [2021-05-06 12:00:24,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-06 12:00:24,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2021-05-06 12:00:24,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 120 states have (on average 1.0333333333333334) internal successors, (124), 120 states have internal predecessors, (124), 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 12:00:24,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 128 transitions. [2021-05-06 12:00:24,307 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 128 transitions. Word has length 121 [2021-05-06 12:00:24,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:24,307 INFO L480 AbstractCegarLoop]: Abstraction has 125 states and 128 transitions. [2021-05-06 12:00:24,307 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 61 states, 60 states have (on average 1.95) internal successors, (117), 59 states have internal predecessors, (117), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:24,307 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 128 transitions. [2021-05-06 12:00:24,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-05-06 12:00:24,307 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:24,307 INFO L523 BasicCegarLoop]: trace histogram [56, 54, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:24,308 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable160 [2021-05-06 12:00:24,308 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:24,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:24,308 INFO L82 PathProgramCache]: Analyzing trace with hash 1729008303, now seen corresponding path program 54 times [2021-05-06 12:00:24,308 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:24,308 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [190080641] [2021-05-06 12:00:24,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:24,315 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:00:24,326 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:24,327 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:24,336 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:24,338 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:24,346 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:00:24,360 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:24,363 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:00:24,363 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:24,372 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:24,380 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:00:24,387 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:24,388 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:24,389 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:00:24,394 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:24,398 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:24,402 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:00:24,410 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:24,413 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:00:24,424 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:24,425 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:24,433 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:24,435 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:24,444 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:00:24,458 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:24,459 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:24,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:24,544 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:24,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:24,548 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 12:00:24,549 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:26,658 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:26,658 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [190080641] [2021-05-06 12:00:26,658 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [190080641] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:26,658 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:26,658 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [62] imperfect sequences [] total 62 [2021-05-06 12:00:26,658 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436804044] [2021-05-06 12:00:26,659 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-06 12:00:26,659 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:26,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-06 12:00:26,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=3915, Unknown=0, NotChecked=0, Total=4160 [2021-05-06 12:00:26,659 INFO L87 Difference]: Start difference. First operand 125 states and 128 transitions. Second operand has 62 states, 61 states have (on average 1.9508196721311475) internal successors, (119), 60 states have internal predecessors, (119), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:32,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:32,502 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2021-05-06 12:00:32,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-05-06 12:00:32,502 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 61 states have (on average 1.9508196721311475) internal successors, (119), 60 states have internal predecessors, (119), 2 states have call successors, (3), 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 123 [2021-05-06 12:00:32,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:32,503 INFO L225 Difference]: With dead ends: 134 [2021-05-06 12:00:32,503 INFO L226 Difference]: Without dead ends: 127 [2021-05-06 12:00:32,504 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2102 ImplicationChecksByTransitivity, 5051.7ms TimeCoverageRelationStatistics Valid=642, Invalid=14120, Unknown=0, NotChecked=0, Total=14762 [2021-05-06 12:00:32,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-06 12:00:32,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2021-05-06 12:00:32,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 122 states have (on average 1.0327868852459017) internal successors, (126), 122 states have internal predecessors, (126), 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 12:00:32,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 130 transitions. [2021-05-06 12:00:32,512 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 130 transitions. Word has length 123 [2021-05-06 12:00:32,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:32,512 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 130 transitions. [2021-05-06 12:00:32,512 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 62 states, 61 states have (on average 1.9508196721311475) internal successors, (119), 60 states have internal predecessors, (119), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:32,512 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 130 transitions. [2021-05-06 12:00:32,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-06 12:00:32,512 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:32,512 INFO L523 BasicCegarLoop]: trace histogram [57, 55, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:32,512 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable163 [2021-05-06 12:00:32,513 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:32,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:32,513 INFO L82 PathProgramCache]: Analyzing trace with hash -338931510, now seen corresponding path program 55 times [2021-05-06 12:00:32,513 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:32,513 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1963577538] [2021-05-06 12:00:32,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:32,519 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:00:32,519 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:32,521 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:32,528 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:32,530 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:32,546 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:00:32,558 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:32,561 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:00:32,565 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:32,569 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:32,573 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:00:32,579 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:32,580 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:32,582 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:00:32,586 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:32,590 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:32,594 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:00:32,600 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:32,603 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:00:32,604 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:32,606 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:32,612 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:32,614 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:32,629 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:00:32,650 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:32,651 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:32,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:32,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:32,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:32,720 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 12:00:32,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:34,859 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:34,859 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1963577538] [2021-05-06 12:00:34,859 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1963577538] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:34,859 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:34,859 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [63] imperfect sequences [] total 63 [2021-05-06 12:00:34,859 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [746136867] [2021-05-06 12:00:34,860 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-06 12:00:34,860 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:34,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-06 12:00:34,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=4041, Unknown=0, NotChecked=0, Total=4290 [2021-05-06 12:00:34,860 INFO L87 Difference]: Start difference. First operand 127 states and 130 transitions. Second operand has 63 states, 62 states have (on average 1.9516129032258065) internal successors, (121), 61 states have internal predecessors, (121), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:40,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:40,729 INFO L93 Difference]: Finished difference Result 136 states and 141 transitions. [2021-05-06 12:00:40,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-06 12:00:40,729 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 62 states have (on average 1.9516129032258065) internal successors, (121), 61 states have internal predecessors, (121), 2 states have call successors, (3), 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 125 [2021-05-06 12:00:40,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:40,730 INFO L225 Difference]: With dead ends: 136 [2021-05-06 12:00:40,730 INFO L226 Difference]: Without dead ends: 129 [2021-05-06 12:00:40,731 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2168 ImplicationChecksByTransitivity, 5171.9ms TimeCoverageRelationStatistics Valid=653, Invalid=14599, Unknown=0, NotChecked=0, Total=15252 [2021-05-06 12:00:40,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-05-06 12:00:40,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2021-05-06 12:00:40,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 124 states have (on average 1.032258064516129) internal successors, (128), 124 states have internal predecessors, (128), 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 12:00:40,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 132 transitions. [2021-05-06 12:00:40,743 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 132 transitions. Word has length 125 [2021-05-06 12:00:40,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:40,743 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 132 transitions. [2021-05-06 12:00:40,743 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 63 states, 62 states have (on average 1.9516129032258065) internal successors, (121), 61 states have internal predecessors, (121), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:40,743 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 132 transitions. [2021-05-06 12:00:40,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-05-06 12:00:40,744 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:40,744 INFO L523 BasicCegarLoop]: trace histogram [58, 56, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:40,744 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable166 [2021-05-06 12:00:40,744 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:40,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:40,744 INFO L82 PathProgramCache]: Analyzing trace with hash 940766245, now seen corresponding path program 56 times [2021-05-06 12:00:40,744 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:40,744 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1168384798] [2021-05-06 12:00:40,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:40,751 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:00:40,762 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:40,764 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:40,771 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:40,773 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:40,782 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:00:40,794 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:40,797 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:00:40,797 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:40,800 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:40,808 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:00:40,814 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:40,815 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:40,816 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:00:40,818 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:40,824 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:40,832 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:00:40,838 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:40,841 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:00:40,850 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:40,851 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:40,860 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:40,862 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:40,869 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:00:40,881 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:40,881 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:40,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:40,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:40,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:40,964 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 12:00:40,965 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:43,075 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:43,075 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1168384798] [2021-05-06 12:00:43,075 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1168384798] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:43,075 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:43,075 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [64] imperfect sequences [] total 64 [2021-05-06 12:00:43,075 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261624192] [2021-05-06 12:00:43,075 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-06 12:00:43,075 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:43,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-06 12:00:43,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=4169, Unknown=0, NotChecked=0, Total=4422 [2021-05-06 12:00:43,076 INFO L87 Difference]: Start difference. First operand 129 states and 132 transitions. Second operand has 64 states, 63 states have (on average 1.9523809523809523) internal successors, (123), 62 states have internal predecessors, (123), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:49,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:49,015 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2021-05-06 12:00:49,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-06 12:00:49,015 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 63 states have (on average 1.9523809523809523) internal successors, (123), 62 states have internal predecessors, (123), 2 states have call successors, (3), 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 127 [2021-05-06 12:00:49,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:49,016 INFO L225 Difference]: With dead ends: 138 [2021-05-06 12:00:49,016 INFO L226 Difference]: Without dead ends: 131 [2021-05-06 12:00:49,016 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2235 ImplicationChecksByTransitivity, 5259.1ms TimeCoverageRelationStatistics Valid=664, Invalid=15086, Unknown=0, NotChecked=0, Total=15750 [2021-05-06 12:00:49,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-05-06 12:00:49,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 131. [2021-05-06 12:00:49,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 126 states have (on average 1.0317460317460319) internal successors, (130), 126 states have internal predecessors, (130), 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 12:00:49,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 134 transitions. [2021-05-06 12:00:49,025 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 134 transitions. Word has length 127 [2021-05-06 12:00:49,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:49,025 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 134 transitions. [2021-05-06 12:00:49,026 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 64 states, 63 states have (on average 1.9523809523809523) internal successors, (123), 62 states have internal predecessors, (123), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:49,026 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 134 transitions. [2021-05-06 12:00:49,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-05-06 12:00:49,026 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:49,026 INFO L523 BasicCegarLoop]: trace histogram [59, 57, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:49,026 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable169 [2021-05-06 12:00:49,026 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:49,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:49,027 INFO L82 PathProgramCache]: Analyzing trace with hash -1925305152, now seen corresponding path program 57 times [2021-05-06 12:00:49,027 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:49,027 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [560219434] [2021-05-06 12:00:49,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:49,036 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:00:49,036 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:49,038 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:49,045 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:49,047 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:49,061 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:00:49,072 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:49,077 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:00:49,081 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:49,084 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:49,088 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:00:49,095 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:49,095 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:49,097 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:00:49,101 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:49,105 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:49,109 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:00:49,115 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:49,119 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:00:49,119 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:49,120 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:49,128 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:49,130 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:49,154 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:00:49,168 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:49,169 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:49,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:49,237 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:49,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:49,240 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 12:00:49,241 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:51,585 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:51,585 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [560219434] [2021-05-06 12:00:51,585 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [560219434] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:51,586 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:51,586 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [65] imperfect sequences [] total 65 [2021-05-06 12:00:51,586 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188113312] [2021-05-06 12:00:51,586 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-06 12:00:51,586 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:51,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-06 12:00:51,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=4299, Unknown=0, NotChecked=0, Total=4556 [2021-05-06 12:00:51,586 INFO L87 Difference]: Start difference. First operand 131 states and 134 transitions. Second operand has 65 states, 64 states have (on average 1.953125) internal successors, (125), 63 states have internal predecessors, (125), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:57,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:57,770 INFO L93 Difference]: Finished difference Result 140 states and 145 transitions. [2021-05-06 12:00:57,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-06 12:00:57,770 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 64 states have (on average 1.953125) internal successors, (125), 63 states have internal predecessors, (125), 2 states have call successors, (3), 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 129 [2021-05-06 12:00:57,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:57,771 INFO L225 Difference]: With dead ends: 140 [2021-05-06 12:00:57,771 INFO L226 Difference]: Without dead ends: 133 [2021-05-06 12:00:57,771 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2303 ImplicationChecksByTransitivity, 5516.9ms TimeCoverageRelationStatistics Valid=675, Invalid=15581, Unknown=0, NotChecked=0, Total=16256 [2021-05-06 12:00:57,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-05-06 12:00:57,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2021-05-06 12:00:57,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.03125) internal successors, (132), 128 states have internal predecessors, (132), 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 12:00:57,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 136 transitions. [2021-05-06 12:00:57,779 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 136 transitions. Word has length 129 [2021-05-06 12:00:57,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:57,780 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 136 transitions. [2021-05-06 12:00:57,780 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 64 states have (on average 1.953125) internal successors, (125), 63 states have internal predecessors, (125), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:57,780 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 136 transitions. [2021-05-06 12:00:57,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-06 12:00:57,780 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:57,780 INFO L523 BasicCegarLoop]: trace histogram [60, 58, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:57,780 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable172 [2021-05-06 12:00:57,780 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:57,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:57,781 INFO L82 PathProgramCache]: Analyzing trace with hash 1149086363, now seen corresponding path program 58 times [2021-05-06 12:00:57,781 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:57,781 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1932895163] [2021-05-06 12:00:57,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:57,787 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:00:57,788 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:57,789 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:57,802 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:57,804 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:57,819 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:00:57,831 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:57,833 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:00:57,834 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:57,837 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:57,844 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:00:57,851 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:57,851 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:57,853 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:00:57,857 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:57,860 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:57,864 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:00:57,871 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:57,873 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:00:57,874 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:57,875 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:57,882 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:57,883 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:57,898 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:00:57,911 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:57,911 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:57,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:57,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:57,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:57,991 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 12:00:57,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:00,228 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:01:00,228 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1932895163] [2021-05-06 12:01:00,228 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1932895163] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:01:00,228 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:01:00,228 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [66] imperfect sequences [] total 66 [2021-05-06 12:01:00,228 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1545926643] [2021-05-06 12:01:00,228 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-06 12:01:00,229 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:01:00,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-06 12:01:00,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=261, Invalid=4431, Unknown=0, NotChecked=0, Total=4692 [2021-05-06 12:01:00,229 INFO L87 Difference]: Start difference. First operand 133 states and 136 transitions. Second operand has 66 states, 65 states have (on average 1.9538461538461538) internal successors, (127), 64 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:06,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:01:06,323 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2021-05-06 12:01:06,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-05-06 12:01:06,323 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 65 states have (on average 1.9538461538461538) internal successors, (127), 64 states have internal predecessors, (127), 2 states have call successors, (3), 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 131 [2021-05-06 12:01:06,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:01:06,324 INFO L225 Difference]: With dead ends: 142 [2021-05-06 12:01:06,324 INFO L226 Difference]: Without dead ends: 135 [2021-05-06 12:01:06,325 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2372 ImplicationChecksByTransitivity, 5448.2ms TimeCoverageRelationStatistics Valid=686, Invalid=16084, Unknown=0, NotChecked=0, Total=16770 [2021-05-06 12:01:06,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-05-06 12:01:06,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2021-05-06 12:01:06,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 130 states have (on average 1.0307692307692307) internal successors, (134), 130 states have internal predecessors, (134), 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 12:01:06,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 138 transitions. [2021-05-06 12:01:06,336 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 138 transitions. Word has length 131 [2021-05-06 12:01:06,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:01:06,337 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 138 transitions. [2021-05-06 12:01:06,337 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 66 states, 65 states have (on average 1.9538461538461538) internal successors, (127), 64 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:06,337 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 138 transitions. [2021-05-06 12:01:06,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-05-06 12:01:06,337 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:01:06,337 INFO L523 BasicCegarLoop]: trace histogram [61, 59, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:01:06,338 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable175 [2021-05-06 12:01:06,338 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:01:06,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:01:06,338 INFO L82 PathProgramCache]: Analyzing trace with hash 701832630, now seen corresponding path program 59 times [2021-05-06 12:01:06,338 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:01:06,338 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1598164367] [2021-05-06 12:01:06,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:01:06,345 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:01:06,346 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:06,347 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:06,356 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:06,358 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:06,374 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:01:06,387 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:06,389 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:01:06,389 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:06,393 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:06,400 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:01:06,406 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:06,407 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:06,418 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:01:06,424 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:06,429 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:06,434 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:01:06,440 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:06,443 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:01:06,443 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:06,444 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:06,452 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:06,454 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:06,468 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:01:06,484 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:06,485 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:06,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:06,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:01:06,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:06,555 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 12:01:06,556 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:08,886 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:01:08,886 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1598164367] [2021-05-06 12:01:08,886 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1598164367] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:01:08,886 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:01:08,886 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [67] imperfect sequences [] total 67 [2021-05-06 12:01:08,886 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112911850] [2021-05-06 12:01:08,886 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2021-05-06 12:01:08,886 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:01:08,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-05-06 12:01:08,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=4565, Unknown=0, NotChecked=0, Total=4830 [2021-05-06 12:01:08,887 INFO L87 Difference]: Start difference. First operand 135 states and 138 transitions. Second operand has 67 states, 66 states have (on average 1.9545454545454546) internal successors, (129), 65 states have internal predecessors, (129), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:15,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:01:15,126 INFO L93 Difference]: Finished difference Result 144 states and 149 transitions. [2021-05-06 12:01:15,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-05-06 12:01:15,126 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 66 states have (on average 1.9545454545454546) internal successors, (129), 65 states have internal predecessors, (129), 2 states have call successors, (3), 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 133 [2021-05-06 12:01:15,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:01:15,127 INFO L225 Difference]: With dead ends: 144 [2021-05-06 12:01:15,127 INFO L226 Difference]: Without dead ends: 137 [2021-05-06 12:01:15,128 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 65 SyntacticMatches, 1 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2442 ImplicationChecksByTransitivity, 5583.5ms TimeCoverageRelationStatistics Valid=697, Invalid=16595, Unknown=0, NotChecked=0, Total=17292 [2021-05-06 12:01:15,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-05-06 12:01:15,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 137. [2021-05-06 12:01:15,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 132 states have (on average 1.0303030303030303) internal successors, (136), 132 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 12:01:15,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 140 transitions. [2021-05-06 12:01:15,140 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 140 transitions. Word has length 133 [2021-05-06 12:01:15,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:01:15,141 INFO L480 AbstractCegarLoop]: Abstraction has 137 states and 140 transitions. [2021-05-06 12:01:15,141 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 67 states, 66 states have (on average 1.9545454545454546) internal successors, (129), 65 states have internal predecessors, (129), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:15,141 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 140 transitions. [2021-05-06 12:01:15,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-05-06 12:01:15,141 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:01:15,141 INFO L523 BasicCegarLoop]: trace histogram [62, 60, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:01:15,142 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable178 [2021-05-06 12:01:15,142 INFO L428 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:01:15,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:01:15,142 INFO L82 PathProgramCache]: Analyzing trace with hash 387724817, now seen corresponding path program 60 times [2021-05-06 12:01:15,142 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:01:15,142 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [971541273] [2021-05-06 12:01:15,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:01:15,149 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:01:15,150 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:15,151 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:15,159 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:15,160 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:15,175 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:01:15,188 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:15,190 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:01:15,190 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:15,194 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:15,210 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:01:15,217 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:15,218 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:15,219 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:01:15,220 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:15,223 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:15,230 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:01:15,237 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:15,240 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:01:15,240 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:15,247 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:15,254 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:15,256 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:15,271 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:01:15,282 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:15,283 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:15,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:15,365 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:01:15,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:15,368 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 12:01:15,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:17,889 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:01:17,889 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [971541273] [2021-05-06 12:01:17,889 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [971541273] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:01:17,889 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:01:17,889 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [68] imperfect sequences [] total 68 [2021-05-06 12:01:17,889 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373884356] [2021-05-06 12:01:17,889 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2021-05-06 12:01:17,890 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:01:17,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-05-06 12:01:17,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=4701, Unknown=0, NotChecked=0, Total=4970 [2021-05-06 12:01:17,890 INFO L87 Difference]: Start difference. First operand 137 states and 140 transitions. Second operand has 68 states, 67 states have (on average 1.955223880597015) internal successors, (131), 66 states have internal predecessors, (131), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:24,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:01:24,395 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2021-05-06 12:01:24,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-05-06 12:01:24,395 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 67 states have (on average 1.955223880597015) internal successors, (131), 66 states have internal predecessors, (131), 2 states have call successors, (3), 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 135 [2021-05-06 12:01:24,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:01:24,396 INFO L225 Difference]: With dead ends: 146 [2021-05-06 12:01:24,396 INFO L226 Difference]: Without dead ends: 139 [2021-05-06 12:01:24,396 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2513 ImplicationChecksByTransitivity, 5894.8ms TimeCoverageRelationStatistics Valid=708, Invalid=17114, Unknown=0, NotChecked=0, Total=17822 [2021-05-06 12:01:24,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-05-06 12:01:24,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2021-05-06 12:01:24,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.0298507462686568) internal successors, (138), 134 states have internal predecessors, (138), 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 12:01:24,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 142 transitions. [2021-05-06 12:01:24,405 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 142 transitions. Word has length 135 [2021-05-06 12:01:24,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:01:24,405 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 142 transitions. [2021-05-06 12:01:24,405 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 68 states, 67 states have (on average 1.955223880597015) internal successors, (131), 66 states have internal predecessors, (131), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:24,405 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 142 transitions. [2021-05-06 12:01:24,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-06 12:01:24,407 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:01:24,407 INFO L523 BasicCegarLoop]: trace histogram [63, 61, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:01:24,407 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable181 [2021-05-06 12:01:24,407 INFO L428 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:01:24,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:01:24,407 INFO L82 PathProgramCache]: Analyzing trace with hash -822172756, now seen corresponding path program 61 times [2021-05-06 12:01:24,407 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:01:24,407 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1793546934] [2021-05-06 12:01:24,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:01:24,413 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:01:24,414 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:24,415 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:24,421 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:24,423 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:24,437 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:01:24,449 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:24,451 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:01:24,452 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:24,455 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:24,463 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:01:24,469 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:24,470 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:24,472 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:01:24,472 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:24,476 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:24,483 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:01:24,490 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:24,492 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:01:24,501 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:24,502 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:24,511 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:24,513 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:24,520 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:01:24,533 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:24,534 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:24,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:24,598 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:01:24,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:24,603 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 12:01:24,604 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:27,070 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:01:27,071 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1793546934] [2021-05-06 12:01:27,071 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1793546934] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:01:27,071 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:01:27,071 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [69] imperfect sequences [] total 69 [2021-05-06 12:01:27,071 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702612880] [2021-05-06 12:01:27,071 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2021-05-06 12:01:27,071 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:01:27,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-05-06 12:01:27,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=273, Invalid=4839, Unknown=0, NotChecked=0, Total=5112 [2021-05-06 12:01:27,072 INFO L87 Difference]: Start difference. First operand 139 states and 142 transitions. Second operand has 69 states, 68 states have (on average 1.9558823529411764) internal successors, (133), 67 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:33,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:01:33,682 INFO L93 Difference]: Finished difference Result 148 states and 153 transitions. [2021-05-06 12:01:33,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-05-06 12:01:33,682 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 68 states have (on average 1.9558823529411764) internal successors, (133), 67 states have internal predecessors, (133), 2 states have call successors, (3), 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 137 [2021-05-06 12:01:33,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:01:33,683 INFO L225 Difference]: With dead ends: 148 [2021-05-06 12:01:33,683 INFO L226 Difference]: Without dead ends: 141 [2021-05-06 12:01:33,684 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2585 ImplicationChecksByTransitivity, 5868.9ms TimeCoverageRelationStatistics Valid=719, Invalid=17641, Unknown=0, NotChecked=0, Total=18360 [2021-05-06 12:01:33,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-06 12:01:33,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 141. [2021-05-06 12:01:33,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 136 states have (on average 1.0294117647058822) internal successors, (140), 136 states have internal predecessors, (140), 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 12:01:33,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 144 transitions. [2021-05-06 12:01:33,693 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 144 transitions. Word has length 137 [2021-05-06 12:01:33,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:01:33,693 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 144 transitions. [2021-05-06 12:01:33,693 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 69 states, 68 states have (on average 1.9558823529411764) internal successors, (133), 67 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:33,693 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 144 transitions. [2021-05-06 12:01:33,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-05-06 12:01:33,694 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:01:33,694 INFO L523 BasicCegarLoop]: trace histogram [64, 62, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:01:33,694 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable184 [2021-05-06 12:01:33,694 INFO L428 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:01:33,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:01:33,694 INFO L82 PathProgramCache]: Analyzing trace with hash 402396807, now seen corresponding path program 62 times [2021-05-06 12:01:33,694 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:01:33,694 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1082858812] [2021-05-06 12:01:33,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:01:33,699 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:01:33,708 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:33,709 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:33,716 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:33,717 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:33,725 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:01:33,738 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:33,740 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:01:33,740 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:33,744 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:33,751 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:01:33,757 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:33,758 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:33,759 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:01:33,760 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:33,763 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:33,775 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:01:33,781 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:33,785 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:01:33,793 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:33,794 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:33,801 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:33,803 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:33,810 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:01:33,822 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:33,823 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:33,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:33,899 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:01:33,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:33,902 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 12:01:33,903 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:36,461 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:01:36,461 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1082858812] [2021-05-06 12:01:36,461 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1082858812] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:01:36,461 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:01:36,461 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [70] imperfect sequences [] total 70 [2021-05-06 12:01:36,461 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1674006794] [2021-05-06 12:01:36,462 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2021-05-06 12:01:36,462 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:01:36,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-05-06 12:01:36,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=4979, Unknown=0, NotChecked=0, Total=5256 [2021-05-06 12:01:36,462 INFO L87 Difference]: Start difference. First operand 141 states and 144 transitions. Second operand has 70 states, 69 states have (on average 1.9565217391304348) internal successors, (135), 68 states have internal predecessors, (135), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:43,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:01:43,286 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2021-05-06 12:01:43,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-05-06 12:01:43,287 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 69 states have (on average 1.9565217391304348) internal successors, (135), 68 states have internal predecessors, (135), 2 states have call successors, (3), 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 139 [2021-05-06 12:01:43,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:01:43,287 INFO L225 Difference]: With dead ends: 150 [2021-05-06 12:01:43,287 INFO L226 Difference]: Without dead ends: 143 [2021-05-06 12:01:43,288 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2658 ImplicationChecksByTransitivity, 6075.6ms TimeCoverageRelationStatistics Valid=730, Invalid=18176, Unknown=0, NotChecked=0, Total=18906 [2021-05-06 12:01:43,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-05-06 12:01:43,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 143. [2021-05-06 12:01:43,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 138 states have (on average 1.0289855072463767) internal successors, (142), 138 states have internal predecessors, (142), 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 12:01:43,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 146 transitions. [2021-05-06 12:01:43,298 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 146 transitions. Word has length 139 [2021-05-06 12:01:43,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:01:43,298 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 146 transitions. [2021-05-06 12:01:43,298 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 70 states, 69 states have (on average 1.9565217391304348) internal successors, (135), 68 states have internal predecessors, (135), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:43,298 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 146 transitions. [2021-05-06 12:01:43,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-05-06 12:01:43,299 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:01:43,299 INFO L523 BasicCegarLoop]: trace histogram [65, 63, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:01:43,299 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable187 [2021-05-06 12:01:43,299 INFO L428 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:01:43,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:01:43,299 INFO L82 PathProgramCache]: Analyzing trace with hash 392707746, now seen corresponding path program 63 times [2021-05-06 12:01:43,299 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:01:43,300 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1050067009] [2021-05-06 12:01:43,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:01:43,305 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:01:43,314 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:43,315 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:43,321 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:43,323 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:43,330 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:01:43,347 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:43,349 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:01:43,350 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:43,353 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:43,360 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:01:43,367 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:43,367 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:43,369 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:01:43,373 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:43,377 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:43,380 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:01:43,389 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:43,392 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:01:43,392 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:43,393 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:43,401 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:43,402 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:43,417 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:01:43,429 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:43,430 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:43,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:43,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:01:43,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:43,506 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 12:01:43,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:46,279 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:01:46,280 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1050067009] [2021-05-06 12:01:46,280 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1050067009] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:01:46,280 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:01:46,280 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [71] imperfect sequences [] total 71 [2021-05-06 12:01:46,280 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908999972] [2021-05-06 12:01:46,280 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2021-05-06 12:01:46,280 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:01:46,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-05-06 12:01:46,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=5121, Unknown=0, NotChecked=0, Total=5402 [2021-05-06 12:01:46,281 INFO L87 Difference]: Start difference. First operand 143 states and 146 transitions. Second operand has 71 states, 70 states have (on average 1.957142857142857) internal successors, (137), 69 states have internal predecessors, (137), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:53,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:01:53,300 INFO L93 Difference]: Finished difference Result 152 states and 157 transitions. [2021-05-06 12:01:53,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-05-06 12:01:53,300 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 70 states have (on average 1.957142857142857) internal successors, (137), 69 states have internal predecessors, (137), 2 states have call successors, (3), 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 141 [2021-05-06 12:01:53,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:01:53,301 INFO L225 Difference]: With dead ends: 152 [2021-05-06 12:01:53,301 INFO L226 Difference]: Without dead ends: 145 [2021-05-06 12:01:53,302 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2732 ImplicationChecksByTransitivity, 6339.8ms TimeCoverageRelationStatistics Valid=741, Invalid=18719, Unknown=0, NotChecked=0, Total=19460 [2021-05-06 12:01:53,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2021-05-06 12:01:53,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 145. [2021-05-06 12:01:53,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 140 states have (on average 1.0285714285714285) internal successors, (144), 140 states have internal predecessors, (144), 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 12:01:53,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 148 transitions. [2021-05-06 12:01:53,312 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 148 transitions. Word has length 141 [2021-05-06 12:01:53,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:01:53,312 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 148 transitions. [2021-05-06 12:01:53,312 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 71 states, 70 states have (on average 1.957142857142857) internal successors, (137), 69 states have internal predecessors, (137), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:53,312 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 148 transitions. [2021-05-06 12:01:53,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-05-06 12:01:53,313 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:01:53,313 INFO L523 BasicCegarLoop]: trace histogram [66, 64, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:01:53,313 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable190 [2021-05-06 12:01:53,313 INFO L428 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:01:53,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:01:53,314 INFO L82 PathProgramCache]: Analyzing trace with hash -328545283, now seen corresponding path program 64 times [2021-05-06 12:01:53,314 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:01:53,314 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1123264453] [2021-05-06 12:01:53,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:01:53,326 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:01:53,326 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:53,328 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:53,334 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:53,336 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:53,350 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:01:53,363 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:53,365 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:01:53,365 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:53,369 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:53,377 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:01:53,383 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:53,384 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:53,385 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:01:53,386 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:53,389 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:53,396 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:01:53,403 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:53,412 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:01:53,422 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:53,423 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:53,430 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:53,432 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:53,439 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:01:53,451 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:53,454 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:53,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:53,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:01:53,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:53,526 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 12:01:53,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:56,145 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:01:56,145 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1123264453] [2021-05-06 12:01:56,145 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1123264453] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:01:56,145 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:01:56,145 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [72] imperfect sequences [] total 72 [2021-05-06 12:01:56,145 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [233051891] [2021-05-06 12:01:56,145 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2021-05-06 12:01:56,145 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:01:56,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-05-06 12:01:56,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=285, Invalid=5265, Unknown=0, NotChecked=0, Total=5550 [2021-05-06 12:01:56,146 INFO L87 Difference]: Start difference. First operand 145 states and 148 transitions. Second operand has 72 states, 71 states have (on average 1.9577464788732395) internal successors, (139), 70 states have internal predecessors, (139), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:03,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:02:03,497 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2021-05-06 12:02:03,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-05-06 12:02:03,497 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 71 states have (on average 1.9577464788732395) internal successors, (139), 70 states have internal predecessors, (139), 2 states have call successors, (3), 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 143 [2021-05-06 12:02:03,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:02:03,498 INFO L225 Difference]: With dead ends: 154 [2021-05-06 12:02:03,498 INFO L226 Difference]: Without dead ends: 147 [2021-05-06 12:02:03,499 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2807 ImplicationChecksByTransitivity, 6275.4ms TimeCoverageRelationStatistics Valid=752, Invalid=19270, Unknown=0, NotChecked=0, Total=20022 [2021-05-06 12:02:03,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-05-06 12:02:03,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 147. [2021-05-06 12:02:03,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 142 states have (on average 1.028169014084507) internal successors, (146), 142 states have internal predecessors, (146), 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 12:02:03,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 150 transitions. [2021-05-06 12:02:03,512 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 150 transitions. Word has length 143 [2021-05-06 12:02:03,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:02:03,513 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 150 transitions. [2021-05-06 12:02:03,513 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 72 states, 71 states have (on average 1.9577464788732395) internal successors, (139), 70 states have internal predecessors, (139), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:03,513 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 150 transitions. [2021-05-06 12:02:03,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-05-06 12:02:03,513 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:02:03,513 INFO L523 BasicCegarLoop]: trace histogram [67, 65, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:02:03,514 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable193 [2021-05-06 12:02:03,514 INFO L428 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:02:03,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:02:03,514 INFO L82 PathProgramCache]: Analyzing trace with hash -1962971496, now seen corresponding path program 65 times [2021-05-06 12:02:03,514 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:02:03,514 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [497447176] [2021-05-06 12:02:03,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:02:03,522 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:02:03,533 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:03,536 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:03,544 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:03,547 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:03,554 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:02:03,566 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:03,568 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:02:03,573 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:03,576 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:03,580 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:02:03,586 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:03,587 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:03,589 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:02:03,589 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:03,598 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:03,605 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:02:03,612 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:03,615 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:02:03,624 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:03,626 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:03,634 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:03,636 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:03,643 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:02:03,655 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:03,656 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:03,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:03,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:02:03,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:03,734 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 12:02:03,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:06,410 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:02:06,410 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [497447176] [2021-05-06 12:02:06,410 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [497447176] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:02:06,410 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:02:06,410 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [73] imperfect sequences [] total 73 [2021-05-06 12:02:06,410 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497228408] [2021-05-06 12:02:06,410 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2021-05-06 12:02:06,410 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:02:06,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-05-06 12:02:06,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=289, Invalid=5411, Unknown=0, NotChecked=0, Total=5700 [2021-05-06 12:02:06,411 INFO L87 Difference]: Start difference. First operand 147 states and 150 transitions. Second operand has 73 states, 72 states have (on average 1.9583333333333333) internal successors, (141), 71 states have internal predecessors, (141), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:13,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:02:13,793 INFO L93 Difference]: Finished difference Result 156 states and 161 transitions. [2021-05-06 12:02:13,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-06 12:02:13,794 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 72 states have (on average 1.9583333333333333) internal successors, (141), 71 states have internal predecessors, (141), 2 states have call successors, (3), 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 145 [2021-05-06 12:02:13,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:02:13,794 INFO L225 Difference]: With dead ends: 156 [2021-05-06 12:02:13,794 INFO L226 Difference]: Without dead ends: 149 [2021-05-06 12:02:13,795 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2883 ImplicationChecksByTransitivity, 6465.0ms TimeCoverageRelationStatistics Valid=763, Invalid=19829, Unknown=0, NotChecked=0, Total=20592 [2021-05-06 12:02:13,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-06 12:02:13,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2021-05-06 12:02:13,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 144 states have (on average 1.0277777777777777) internal successors, (148), 144 states have internal predecessors, (148), 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 12:02:13,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 152 transitions. [2021-05-06 12:02:13,808 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 152 transitions. Word has length 145 [2021-05-06 12:02:13,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:02:13,808 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 152 transitions. [2021-05-06 12:02:13,808 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 73 states, 72 states have (on average 1.9583333333333333) internal successors, (141), 71 states have internal predecessors, (141), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:13,808 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 152 transitions. [2021-05-06 12:02:13,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-05-06 12:02:13,809 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:02:13,809 INFO L523 BasicCegarLoop]: trace histogram [68, 66, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:02:13,809 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable196 [2021-05-06 12:02:13,809 INFO L428 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:02:13,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:02:13,809 INFO L82 PathProgramCache]: Analyzing trace with hash -688531853, now seen corresponding path program 66 times [2021-05-06 12:02:13,809 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:02:13,809 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1492825760] [2021-05-06 12:02:13,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:02:13,816 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:02:13,827 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:13,828 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:13,837 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:13,839 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:13,847 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:02:13,861 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:13,863 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:02:13,869 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:13,873 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:13,878 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:02:13,885 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:13,886 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:13,888 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:02:13,889 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:13,893 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:13,902 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:02:13,909 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:13,913 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:02:13,914 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:13,915 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:13,923 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:13,926 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:13,942 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:02:13,956 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:13,957 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:13,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:14,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:02:14,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:14,027 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 12:02:14,028 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:16,825 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:02:16,826 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1492825760] [2021-05-06 12:02:16,826 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1492825760] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:02:16,826 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:02:16,826 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [74] imperfect sequences [] total 74 [2021-05-06 12:02:16,826 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824963188] [2021-05-06 12:02:16,826 INFO L460 AbstractCegarLoop]: Interpolant automaton has 74 states [2021-05-06 12:02:16,826 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:02:16,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-05-06 12:02:16,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=5559, Unknown=0, NotChecked=0, Total=5852 [2021-05-06 12:02:16,827 INFO L87 Difference]: Start difference. First operand 149 states and 152 transitions. Second operand has 74 states, 73 states have (on average 1.9589041095890412) internal successors, (143), 72 states have internal predecessors, (143), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:24,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:02:24,476 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2021-05-06 12:02:24,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-05-06 12:02:24,477 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 73 states have (on average 1.9589041095890412) internal successors, (143), 72 states have internal predecessors, (143), 2 states have call successors, (3), 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 147 [2021-05-06 12:02:24,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:02:24,477 INFO L225 Difference]: With dead ends: 158 [2021-05-06 12:02:24,477 INFO L226 Difference]: Without dead ends: 151 [2021-05-06 12:02:24,478 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2960 ImplicationChecksByTransitivity, 6633.4ms TimeCoverageRelationStatistics Valid=774, Invalid=20396, Unknown=0, NotChecked=0, Total=21170 [2021-05-06 12:02:24,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-05-06 12:02:24,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2021-05-06 12:02:24,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 146 states have (on average 1.0273972602739727) internal successors, (150), 146 states have internal predecessors, (150), 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 12:02:24,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 154 transitions. [2021-05-06 12:02:24,492 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 154 transitions. Word has length 147 [2021-05-06 12:02:24,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:02:24,492 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 154 transitions. [2021-05-06 12:02:24,492 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 74 states, 73 states have (on average 1.9589041095890412) internal successors, (143), 72 states have internal predecessors, (143), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:24,492 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 154 transitions. [2021-05-06 12:02:24,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-05-06 12:02:24,493 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:02:24,493 INFO L523 BasicCegarLoop]: trace histogram [69, 67, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:02:24,493 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable199 [2021-05-06 12:02:24,493 INFO L428 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:02:24,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:02:24,493 INFO L82 PathProgramCache]: Analyzing trace with hash -17714290, now seen corresponding path program 67 times [2021-05-06 12:02:24,493 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:02:24,494 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1450548857] [2021-05-06 12:02:24,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:02:24,500 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:02:24,501 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:24,502 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:24,510 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:24,512 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:24,527 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:02:24,538 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:24,541 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:02:24,541 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:24,545 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:24,554 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:02:24,560 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:24,561 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:24,562 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:02:24,563 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:24,566 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:24,574 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:02:24,580 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:24,583 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:02:24,592 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:24,593 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:24,600 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:24,602 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:24,609 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:02:24,623 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:24,624 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:24,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:24,705 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:02:24,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:24,708 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 12:02:24,710 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:27,621 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:02:27,621 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1450548857] [2021-05-06 12:02:27,621 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1450548857] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:02:27,622 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:02:27,622 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [75] imperfect sequences [] total 75 [2021-05-06 12:02:27,622 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45077409] [2021-05-06 12:02:27,622 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2021-05-06 12:02:27,622 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:02:27,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-05-06 12:02:27,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=297, Invalid=5709, Unknown=0, NotChecked=0, Total=6006 [2021-05-06 12:02:27,623 INFO L87 Difference]: Start difference. First operand 151 states and 154 transitions. Second operand has 75 states, 74 states have (on average 1.9594594594594594) internal successors, (145), 73 states have internal predecessors, (145), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:35,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:02:35,315 INFO L93 Difference]: Finished difference Result 160 states and 165 transitions. [2021-05-06 12:02:35,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-05-06 12:02:35,316 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 74 states have (on average 1.9594594594594594) internal successors, (145), 73 states have internal predecessors, (145), 2 states have call successors, (3), 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 149 [2021-05-06 12:02:35,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:02:35,317 INFO L225 Difference]: With dead ends: 160 [2021-05-06 12:02:35,317 INFO L226 Difference]: Without dead ends: 153 [2021-05-06 12:02:35,318 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3038 ImplicationChecksByTransitivity, 6864.5ms TimeCoverageRelationStatistics Valid=785, Invalid=20971, Unknown=0, NotChecked=0, Total=21756 [2021-05-06 12:02:35,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2021-05-06 12:02:35,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 153. [2021-05-06 12:02:35,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 148 states have (on average 1.027027027027027) internal successors, (152), 148 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 12:02:35,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 156 transitions. [2021-05-06 12:02:35,329 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 156 transitions. Word has length 149 [2021-05-06 12:02:35,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:02:35,329 INFO L480 AbstractCegarLoop]: Abstraction has 153 states and 156 transitions. [2021-05-06 12:02:35,329 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 75 states, 74 states have (on average 1.9594594594594594) internal successors, (145), 73 states have internal predecessors, (145), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:35,329 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 156 transitions. [2021-05-06 12:02:35,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-05-06 12:02:35,330 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:02:35,330 INFO L523 BasicCegarLoop]: trace histogram [70, 68, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:02:35,330 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable202 [2021-05-06 12:02:35,330 INFO L428 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:02:35,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:02:35,330 INFO L82 PathProgramCache]: Analyzing trace with hash 392869353, now seen corresponding path program 68 times [2021-05-06 12:02:35,331 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:02:35,331 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [218878894] [2021-05-06 12:02:35,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:02:35,337 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:02:35,338 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:35,339 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:35,348 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:35,350 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:35,366 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:02:35,378 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:35,380 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:02:35,384 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:35,387 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:35,391 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:02:35,397 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:35,398 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:35,399 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:02:35,400 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:35,403 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:35,411 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:02:35,417 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:35,420 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:02:35,421 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:35,422 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:35,430 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:35,432 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:35,447 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:02:35,459 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:35,460 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:35,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:35,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:02:35,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:35,534 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 12:02:35,535 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:38,406 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:02:38,407 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [218878894] [2021-05-06 12:02:38,407 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [218878894] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:02:38,407 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:02:38,407 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [76] imperfect sequences [] total 76 [2021-05-06 12:02:38,407 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087123657] [2021-05-06 12:02:38,407 INFO L460 AbstractCegarLoop]: Interpolant automaton has 76 states [2021-05-06 12:02:38,407 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:02:38,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-05-06 12:02:38,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=5861, Unknown=0, NotChecked=0, Total=6162 [2021-05-06 12:02:38,408 INFO L87 Difference]: Start difference. First operand 153 states and 156 transitions. Second operand has 76 states, 75 states have (on average 1.96) internal successors, (147), 74 states have internal predecessors, (147), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:46,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:02:46,470 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2021-05-06 12:02:46,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-05-06 12:02:46,471 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 75 states have (on average 1.96) internal successors, (147), 74 states have internal predecessors, (147), 2 states have call successors, (3), 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 151 [2021-05-06 12:02:46,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:02:46,472 INFO L225 Difference]: With dead ends: 162 [2021-05-06 12:02:46,472 INFO L226 Difference]: Without dead ends: 155 [2021-05-06 12:02:46,473 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 74 SyntacticMatches, 1 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3117 ImplicationChecksByTransitivity, 6889.3ms TimeCoverageRelationStatistics Valid=796, Invalid=21554, Unknown=0, NotChecked=0, Total=22350 [2021-05-06 12:02:46,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-05-06 12:02:46,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 155. [2021-05-06 12:02:46,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 150 states have (on average 1.0266666666666666) internal successors, (154), 150 states have internal predecessors, (154), 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 12:02:46,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 158 transitions. [2021-05-06 12:02:46,487 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 158 transitions. Word has length 151 [2021-05-06 12:02:46,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:02:46,487 INFO L480 AbstractCegarLoop]: Abstraction has 155 states and 158 transitions. [2021-05-06 12:02:46,487 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 76 states, 75 states have (on average 1.96) internal successors, (147), 74 states have internal predecessors, (147), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:46,487 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 158 transitions. [2021-05-06 12:02:46,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2021-05-06 12:02:46,488 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:02:46,488 INFO L523 BasicCegarLoop]: trace histogram [71, 69, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:02:46,488 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable205 [2021-05-06 12:02:46,488 INFO L428 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:02:46,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:02:46,488 INFO L82 PathProgramCache]: Analyzing trace with hash -173240956, now seen corresponding path program 69 times [2021-05-06 12:02:46,488 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:02:46,488 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [480567837] [2021-05-06 12:02:46,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:02:46,495 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:02:46,505 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:46,506 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:46,513 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:46,515 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:46,522 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:02:46,534 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:46,537 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:02:46,537 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:46,542 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:46,553 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:02:46,561 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:46,562 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:46,564 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:02:46,570 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:46,574 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:46,580 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:02:46,588 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:46,592 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:02:46,592 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:46,594 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:46,603 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:46,605 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:46,622 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:02:46,634 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:46,635 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:46,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:46,715 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:02:46,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:46,718 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 12:02:46,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:49,778 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:02:49,778 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [480567837] [2021-05-06 12:02:49,778 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [480567837] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:02:49,778 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:02:49,778 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [77] imperfect sequences [] total 77 [2021-05-06 12:02:49,778 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912260835] [2021-05-06 12:02:49,778 INFO L460 AbstractCegarLoop]: Interpolant automaton has 77 states [2021-05-06 12:02:49,778 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:02:49,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-05-06 12:02:49,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=6015, Unknown=0, NotChecked=0, Total=6320 [2021-05-06 12:02:49,779 INFO L87 Difference]: Start difference. First operand 155 states and 158 transitions. Second operand has 77 states, 76 states have (on average 1.9605263157894737) internal successors, (149), 75 states have internal predecessors, (149), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:57,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:02:57,973 INFO L93 Difference]: Finished difference Result 164 states and 169 transitions. [2021-05-06 12:02:57,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-05-06 12:02:57,974 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 76 states have (on average 1.9605263157894737) internal successors, (149), 75 states have internal predecessors, (149), 2 states have call successors, (3), 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 153 [2021-05-06 12:02:57,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:02:57,974 INFO L225 Difference]: With dead ends: 164 [2021-05-06 12:02:57,974 INFO L226 Difference]: Without dead ends: 157 [2021-05-06 12:02:57,975 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 75 SyntacticMatches, 1 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3197 ImplicationChecksByTransitivity, 7224.1ms TimeCoverageRelationStatistics Valid=807, Invalid=22145, Unknown=0, NotChecked=0, Total=22952 [2021-05-06 12:02:57,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-05-06 12:02:57,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2021-05-06 12:02:57,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 152 states have (on average 1.0263157894736843) internal successors, (156), 152 states have internal predecessors, (156), 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 12:02:57,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 160 transitions. [2021-05-06 12:02:57,984 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 160 transitions. Word has length 153 [2021-05-06 12:02:57,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:02:57,984 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 160 transitions. [2021-05-06 12:02:57,984 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 77 states, 76 states have (on average 1.9605263157894737) internal successors, (149), 75 states have internal predecessors, (149), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:57,985 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 160 transitions. [2021-05-06 12:02:57,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-05-06 12:02:57,985 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:02:57,985 INFO L523 BasicCegarLoop]: trace histogram [72, 70, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:02:57,985 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable208 [2021-05-06 12:02:57,985 INFO L428 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:02:57,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:02:57,985 INFO L82 PathProgramCache]: Analyzing trace with hash 1255598687, now seen corresponding path program 70 times [2021-05-06 12:02:57,986 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:02:57,986 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [977540300] [2021-05-06 12:02:57,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:02:57,991 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:02:57,991 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:57,992 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:57,999 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:58,001 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:58,019 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:02:58,031 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:58,033 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:02:58,034 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:58,037 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:58,044 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:02:58,050 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:58,051 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:58,053 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:02:58,053 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:58,056 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:58,064 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:02:58,070 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:58,073 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:02:58,082 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:58,083 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:58,090 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:58,092 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:58,099 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:02:58,111 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:58,112 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:58,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:58,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:02:58,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:58,186 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 12:02:58,187 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:01,255 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:01,255 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [977540300] [2021-05-06 12:03:01,256 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [977540300] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:01,256 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:01,256 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [78] imperfect sequences [] total 78 [2021-05-06 12:03:01,256 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319132839] [2021-05-06 12:03:01,256 INFO L460 AbstractCegarLoop]: Interpolant automaton has 78 states [2021-05-06 12:03:01,256 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:01,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-05-06 12:03:01,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=6171, Unknown=0, NotChecked=0, Total=6480 [2021-05-06 12:03:01,257 INFO L87 Difference]: Start difference. First operand 157 states and 160 transitions. Second operand has 78 states, 77 states have (on average 1.9610389610389611) internal successors, (151), 76 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:09,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:09,574 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2021-05-06 12:03:09,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-05-06 12:03:09,575 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 77 states have (on average 1.9610389610389611) internal successors, (151), 76 states have internal predecessors, (151), 2 states have call successors, (3), 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 155 [2021-05-06 12:03:09,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:09,576 INFO L225 Difference]: With dead ends: 166 [2021-05-06 12:03:09,576 INFO L226 Difference]: Without dead ends: 159 [2021-05-06 12:03:09,577 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3278 ImplicationChecksByTransitivity, 7286.7ms TimeCoverageRelationStatistics Valid=818, Invalid=22744, Unknown=0, NotChecked=0, Total=23562 [2021-05-06 12:03:09,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-05-06 12:03:09,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2021-05-06 12:03:09,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 154 states have (on average 1.025974025974026) internal successors, (158), 154 states have internal predecessors, (158), 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 12:03:09,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 162 transitions. [2021-05-06 12:03:09,591 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 162 transitions. Word has length 155 [2021-05-06 12:03:09,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:09,591 INFO L480 AbstractCegarLoop]: Abstraction has 159 states and 162 transitions. [2021-05-06 12:03:09,591 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 78 states, 77 states have (on average 1.9610389610389611) internal successors, (151), 76 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:09,591 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 162 transitions. [2021-05-06 12:03:09,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-05-06 12:03:09,592 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:09,592 INFO L523 BasicCegarLoop]: trace histogram [73, 71, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:09,592 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable211 [2021-05-06 12:03:09,592 INFO L428 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:09,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:09,593 INFO L82 PathProgramCache]: Analyzing trace with hash -19039110, now seen corresponding path program 71 times [2021-05-06 12:03:09,593 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:09,593 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [104520647] [2021-05-06 12:03:09,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:09,599 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:03:09,610 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:09,611 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:09,620 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:09,622 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:09,630 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:03:09,643 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:09,645 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:03:09,649 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:09,653 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:09,656 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:03:09,663 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:09,663 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:09,673 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:03:09,677 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:09,681 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:09,685 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:03:09,691 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:09,694 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:03:09,694 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:09,695 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:09,703 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:09,705 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:09,718 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:03:09,730 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:09,731 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:09,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:09,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:09,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:09,813 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 12:03:09,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:13,034 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:13,034 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [104520647] [2021-05-06 12:03:13,034 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [104520647] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:13,034 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:13,034 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [79] imperfect sequences [] total 79 [2021-05-06 12:03:13,034 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2093906094] [2021-05-06 12:03:13,035 INFO L460 AbstractCegarLoop]: Interpolant automaton has 79 states [2021-05-06 12:03:13,035 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:13,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-05-06 12:03:13,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=313, Invalid=6329, Unknown=0, NotChecked=0, Total=6642 [2021-05-06 12:03:13,035 INFO L87 Difference]: Start difference. First operand 159 states and 162 transitions. Second operand has 79 states, 78 states have (on average 1.9615384615384615) internal successors, (153), 77 states have internal predecessors, (153), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:21,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:21,635 INFO L93 Difference]: Finished difference Result 168 states and 173 transitions. [2021-05-06 12:03:21,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-05-06 12:03:21,636 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 78 states have (on average 1.9615384615384615) internal successors, (153), 77 states have internal predecessors, (153), 2 states have call successors, (3), 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 157 [2021-05-06 12:03:21,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:21,637 INFO L225 Difference]: With dead ends: 168 [2021-05-06 12:03:21,637 INFO L226 Difference]: Without dead ends: 161 [2021-05-06 12:03:21,637 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3360 ImplicationChecksByTransitivity, 7570.2ms TimeCoverageRelationStatistics Valid=829, Invalid=23351, Unknown=0, NotChecked=0, Total=24180 [2021-05-06 12:03:21,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-05-06 12:03:21,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 161. [2021-05-06 12:03:21,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 156 states have (on average 1.0256410256410255) internal successors, (160), 156 states have internal predecessors, (160), 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 12:03:21,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 164 transitions. [2021-05-06 12:03:21,648 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 164 transitions. Word has length 157 [2021-05-06 12:03:21,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:21,649 INFO L480 AbstractCegarLoop]: Abstraction has 161 states and 164 transitions. [2021-05-06 12:03:21,649 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 79 states, 78 states have (on average 1.9615384615384615) internal successors, (153), 77 states have internal predecessors, (153), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:21,649 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 164 transitions. [2021-05-06 12:03:21,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-05-06 12:03:21,650 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:21,650 INFO L523 BasicCegarLoop]: trace histogram [74, 72, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:21,650 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable214 [2021-05-06 12:03:21,650 INFO L428 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:21,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:21,650 INFO L82 PathProgramCache]: Analyzing trace with hash -880282667, now seen corresponding path program 72 times [2021-05-06 12:03:21,650 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:21,650 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1096562220] [2021-05-06 12:03:21,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:21,657 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:03:21,667 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:21,668 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:21,677 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:21,678 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:21,686 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:03:21,697 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:21,701 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:03:21,701 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:21,705 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:21,713 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:03:21,719 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:21,720 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:21,721 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:03:21,725 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:21,729 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:21,732 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:03:21,739 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:21,741 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:03:21,750 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:21,751 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:21,757 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:21,759 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:21,766 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:03:21,778 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:21,779 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:21,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:21,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:21,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:21,854 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 12:03:21,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:25,044 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:25,044 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1096562220] [2021-05-06 12:03:25,044 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1096562220] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:25,044 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:25,045 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [80] imperfect sequences [] total 80 [2021-05-06 12:03:25,045 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079827647] [2021-05-06 12:03:25,045 INFO L460 AbstractCegarLoop]: Interpolant automaton has 80 states [2021-05-06 12:03:25,045 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:25,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-05-06 12:03:25,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=317, Invalid=6489, Unknown=0, NotChecked=0, Total=6806 [2021-05-06 12:03:25,045 INFO L87 Difference]: Start difference. First operand 161 states and 164 transitions. Second operand has 80 states, 79 states have (on average 1.9620253164556962) internal successors, (155), 78 states have internal predecessors, (155), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:33,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:33,846 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2021-05-06 12:03:33,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-05-06 12:03:33,846 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 79 states have (on average 1.9620253164556962) internal successors, (155), 78 states have internal predecessors, (155), 2 states have call successors, (3), 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 159 [2021-05-06 12:03:33,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:33,846 INFO L225 Difference]: With dead ends: 170 [2021-05-06 12:03:33,847 INFO L226 Difference]: Without dead ends: 163 [2021-05-06 12:03:33,847 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3443 ImplicationChecksByTransitivity, 7642.0ms TimeCoverageRelationStatistics Valid=840, Invalid=23966, Unknown=0, NotChecked=0, Total=24806 [2021-05-06 12:03:33,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2021-05-06 12:03:33,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 163. [2021-05-06 12:03:33,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 158 states have (on average 1.0253164556962024) internal successors, (162), 158 states have internal predecessors, (162), 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 12:03:33,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 166 transitions. [2021-05-06 12:03:33,862 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 166 transitions. Word has length 159 [2021-05-06 12:03:33,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:33,862 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 166 transitions. [2021-05-06 12:03:33,862 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 80 states, 79 states have (on average 1.9620253164556962) internal successors, (155), 78 states have internal predecessors, (155), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:33,862 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 166 transitions. [2021-05-06 12:03:33,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-05-06 12:03:33,863 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:33,863 INFO L523 BasicCegarLoop]: trace histogram [75, 73, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:33,863 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable217 [2021-05-06 12:03:33,863 INFO L428 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:33,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:33,863 INFO L82 PathProgramCache]: Analyzing trace with hash 393347184, now seen corresponding path program 73 times [2021-05-06 12:03:33,864 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:33,864 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1251935946] [2021-05-06 12:03:33,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:33,870 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:03:33,881 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:33,882 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:33,890 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:33,891 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:33,898 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:03:33,910 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:33,912 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:03:33,916 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:33,920 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:33,923 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:03:33,930 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:33,930 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:33,932 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:03:33,936 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:33,939 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:33,943 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:03:33,949 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:33,959 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:03:33,968 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:33,969 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:33,976 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:33,978 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:33,985 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:03:33,997 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:33,997 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:34,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:34,078 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:34,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:34,081 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 12:03:34,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:37,547 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:37,548 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1251935946] [2021-05-06 12:03:37,548 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1251935946] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:37,548 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:37,548 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [81] imperfect sequences [] total 81 [2021-05-06 12:03:37,548 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495945294] [2021-05-06 12:03:37,548 INFO L460 AbstractCegarLoop]: Interpolant automaton has 81 states [2021-05-06 12:03:37,548 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:37,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2021-05-06 12:03:37,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=6651, Unknown=0, NotChecked=0, Total=6972 [2021-05-06 12:03:37,549 INFO L87 Difference]: Start difference. First operand 163 states and 166 transitions. Second operand has 81 states, 80 states have (on average 1.9625) internal successors, (157), 79 states have internal predecessors, (157), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:46,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:46,652 INFO L93 Difference]: Finished difference Result 172 states and 177 transitions. [2021-05-06 12:03:46,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-05-06 12:03:46,652 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 80 states have (on average 1.9625) internal successors, (157), 79 states have internal predecessors, (157), 2 states have call successors, (3), 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 161 [2021-05-06 12:03:46,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:46,653 INFO L225 Difference]: With dead ends: 172 [2021-05-06 12:03:46,653 INFO L226 Difference]: Without dead ends: 165 [2021-05-06 12:03:46,654 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3527 ImplicationChecksByTransitivity, 8042.3ms TimeCoverageRelationStatistics Valid=851, Invalid=24589, Unknown=0, NotChecked=0, Total=25440 [2021-05-06 12:03:46,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-05-06 12:03:46,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 165. [2021-05-06 12:03:46,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 160 states have (on average 1.025) internal successors, (164), 160 states have internal predecessors, (164), 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 12:03:46,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 168 transitions. [2021-05-06 12:03:46,663 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 168 transitions. Word has length 161 [2021-05-06 12:03:46,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:46,664 INFO L480 AbstractCegarLoop]: Abstraction has 165 states and 168 transitions. [2021-05-06 12:03:46,664 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 81 states, 80 states have (on average 1.9625) internal successors, (157), 79 states have internal predecessors, (157), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:46,664 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 168 transitions. [2021-05-06 12:03:46,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2021-05-06 12:03:46,664 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:46,665 INFO L523 BasicCegarLoop]: trace histogram [76, 74, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:46,665 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable220 [2021-05-06 12:03:46,665 INFO L428 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:46,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:46,665 INFO L82 PathProgramCache]: Analyzing trace with hash 285954635, now seen corresponding path program 74 times [2021-05-06 12:03:46,665 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:46,665 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1749364131] [2021-05-06 12:03:46,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:46,680 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:03:46,681 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:46,682 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:46,690 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:46,693 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:46,708 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:03:46,720 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:46,723 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:03:46,723 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:46,727 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:46,734 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:03:46,741 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:46,742 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:46,743 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:03:46,744 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:46,747 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:46,755 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:03:46,761 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:46,764 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:03:46,773 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:46,775 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:46,781 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:46,783 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:46,791 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:03:46,803 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:46,804 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:46,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:46,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:46,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:46,876 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 12:03:46,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:50,252 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:50,252 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1749364131] [2021-05-06 12:03:50,252 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1749364131] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:50,252 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:50,252 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [82] imperfect sequences [] total 82 [2021-05-06 12:03:50,252 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1034263310] [2021-05-06 12:03:50,253 INFO L460 AbstractCegarLoop]: Interpolant automaton has 82 states [2021-05-06 12:03:50,253 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:50,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-05-06 12:03:50,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=6815, Unknown=0, NotChecked=0, Total=7140 [2021-05-06 12:03:50,253 INFO L87 Difference]: Start difference. First operand 165 states and 168 transitions. Second operand has 82 states, 81 states have (on average 1.962962962962963) internal successors, (159), 80 states have internal predecessors, (159), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:59,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:59,537 INFO L93 Difference]: Finished difference Result 174 states and 179 transitions. [2021-05-06 12:03:59,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-05-06 12:03:59,537 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 81 states have (on average 1.962962962962963) internal successors, (159), 80 states have internal predecessors, (159), 2 states have call successors, (3), 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 163 [2021-05-06 12:03:59,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:59,538 INFO L225 Difference]: With dead ends: 174 [2021-05-06 12:03:59,538 INFO L226 Difference]: Without dead ends: 167 [2021-05-06 12:03:59,539 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 80 SyntacticMatches, 1 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3612 ImplicationChecksByTransitivity, 8050.2ms TimeCoverageRelationStatistics Valid=862, Invalid=25220, Unknown=0, NotChecked=0, Total=26082 [2021-05-06 12:03:59,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-05-06 12:03:59,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 167. [2021-05-06 12:03:59,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 162 states have (on average 1.0246913580246915) internal successors, (166), 162 states have internal predecessors, (166), 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 12:03:59,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 170 transitions. [2021-05-06 12:03:59,552 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 170 transitions. Word has length 163 [2021-05-06 12:03:59,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:59,552 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 170 transitions. [2021-05-06 12:03:59,552 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 82 states, 81 states have (on average 1.962962962962963) internal successors, (159), 80 states have internal predecessors, (159), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:59,552 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 170 transitions. [2021-05-06 12:03:59,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2021-05-06 12:03:59,552 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:59,553 INFO L523 BasicCegarLoop]: trace histogram [77, 75, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:59,553 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable223 [2021-05-06 12:03:59,553 INFO L428 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:59,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:59,553 INFO L82 PathProgramCache]: Analyzing trace with hash 160930150, now seen corresponding path program 75 times [2021-05-06 12:03:59,553 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:59,553 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [395897005] [2021-05-06 12:03:59,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:59,559 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:03:59,559 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:59,560 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:59,568 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:59,570 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:59,584 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:03:59,596 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:59,608 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:03:59,612 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:59,616 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:59,619 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:03:59,626 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:59,626 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:59,628 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:03:59,632 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:59,636 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:59,640 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:03:59,646 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:59,649 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:03:59,649 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:59,650 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:59,668 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:59,670 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:59,690 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:03:59,706 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:59,707 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:59,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:59,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:59,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:59,787 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 12:03:59,789 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:03,253 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:03,254 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [395897005] [2021-05-06 12:04:03,254 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [395897005] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:03,254 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:03,254 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [83] imperfect sequences [] total 83 [2021-05-06 12:04:03,254 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [816166074] [2021-05-06 12:04:03,254 INFO L460 AbstractCegarLoop]: Interpolant automaton has 83 states [2021-05-06 12:04:03,254 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:03,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-05-06 12:04:03,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=6981, Unknown=0, NotChecked=0, Total=7310 [2021-05-06 12:04:03,255 INFO L87 Difference]: Start difference. First operand 167 states and 170 transitions. Second operand has 83 states, 82 states have (on average 1.9634146341463414) internal successors, (161), 81 states have internal predecessors, (161), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:12,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:12,917 INFO L93 Difference]: Finished difference Result 176 states and 181 transitions. [2021-05-06 12:04:12,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-05-06 12:04:12,918 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 82 states have (on average 1.9634146341463414) internal successors, (161), 81 states have internal predecessors, (161), 2 states have call successors, (3), 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 165 [2021-05-06 12:04:12,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:12,918 INFO L225 Difference]: With dead ends: 176 [2021-05-06 12:04:12,918 INFO L226 Difference]: Without dead ends: 169 [2021-05-06 12:04:12,919 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3698 ImplicationChecksByTransitivity, 8271.8ms TimeCoverageRelationStatistics Valid=873, Invalid=25859, Unknown=0, NotChecked=0, Total=26732 [2021-05-06 12:04:12,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-05-06 12:04:12,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2021-05-06 12:04:12,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 164 states have (on average 1.024390243902439) internal successors, (168), 164 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 12:04:12,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 172 transitions. [2021-05-06 12:04:12,929 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 172 transitions. Word has length 165 [2021-05-06 12:04:12,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:12,929 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 172 transitions. [2021-05-06 12:04:12,929 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 83 states, 82 states have (on average 1.9634146341463414) internal successors, (161), 81 states have internal predecessors, (161), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:12,929 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 172 transitions. [2021-05-06 12:04:12,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-05-06 12:04:12,929 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:12,930 INFO L523 BasicCegarLoop]: trace histogram [78, 76, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:12,930 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable226 [2021-05-06 12:04:12,930 INFO L428 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:12,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:12,930 INFO L82 PathProgramCache]: Analyzing trace with hash 271484353, now seen corresponding path program 76 times [2021-05-06 12:04:12,930 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:12,930 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1999425555] [2021-05-06 12:04:12,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:12,935 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:04:12,944 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:12,946 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:12,954 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:12,955 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:12,963 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:04:12,975 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:12,977 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:04:12,978 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:12,981 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:12,988 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:04:12,995 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:12,995 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:12,997 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:04:13,001 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:13,005 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:13,008 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:04:13,015 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:13,018 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:04:13,018 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:13,020 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:13,026 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:13,028 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:13,042 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:04:13,054 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:13,055 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:13,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:13,128 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:13,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:13,131 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 12:04:13,133 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:16,686 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:16,686 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1999425555] [2021-05-06 12:04:16,686 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1999425555] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:16,686 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:16,686 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [84] imperfect sequences [] total 84 [2021-05-06 12:04:16,686 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47229584] [2021-05-06 12:04:16,687 INFO L460 AbstractCegarLoop]: Interpolant automaton has 84 states [2021-05-06 12:04:16,687 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:16,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-05-06 12:04:16,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=333, Invalid=7149, Unknown=0, NotChecked=0, Total=7482 [2021-05-06 12:04:16,687 INFO L87 Difference]: Start difference. First operand 169 states and 172 transitions. Second operand has 84 states, 83 states have (on average 1.963855421686747) internal successors, (163), 82 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:26,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:26,679 INFO L93 Difference]: Finished difference Result 178 states and 183 transitions. [2021-05-06 12:04:26,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-05-06 12:04:26,679 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 83 states have (on average 1.963855421686747) internal successors, (163), 82 states have internal predecessors, (163), 2 states have call successors, (3), 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 167 [2021-05-06 12:04:26,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:26,680 INFO L225 Difference]: With dead ends: 178 [2021-05-06 12:04:26,680 INFO L226 Difference]: Without dead ends: 171 [2021-05-06 12:04:26,682 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3785 ImplicationChecksByTransitivity, 8426.5ms TimeCoverageRelationStatistics Valid=884, Invalid=26506, Unknown=0, NotChecked=0, Total=27390 [2021-05-06 12:04:26,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2021-05-06 12:04:26,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 171. [2021-05-06 12:04:26,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 166 states have (on average 1.0240963855421688) internal successors, (170), 166 states have internal predecessors, (170), 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 12:04:26,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 174 transitions. [2021-05-06 12:04:26,704 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 174 transitions. Word has length 167 [2021-05-06 12:04:26,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:26,704 INFO L480 AbstractCegarLoop]: Abstraction has 171 states and 174 transitions. [2021-05-06 12:04:26,704 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 84 states, 83 states have (on average 1.963855421686747) internal successors, (163), 82 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:26,704 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 174 transitions. [2021-05-06 12:04:26,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2021-05-06 12:04:26,705 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:26,705 INFO L523 BasicCegarLoop]: trace histogram [79, 77, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:26,705 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable229 [2021-05-06 12:04:26,705 INFO L428 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:26,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:26,706 INFO L82 PathProgramCache]: Analyzing trace with hash -860108964, now seen corresponding path program 77 times [2021-05-06 12:04:26,706 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:26,706 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [349236302] [2021-05-06 12:04:26,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:26,712 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:04:26,722 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:26,723 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:26,731 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:26,732 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:26,740 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:04:26,752 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:26,766 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:04:26,767 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:26,772 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:26,779 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:04:26,785 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:26,786 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:26,788 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:04:26,792 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:26,796 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:26,799 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:04:26,806 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:26,808 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:04:26,817 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:26,818 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:26,824 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:26,826 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:26,833 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:04:26,845 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:26,846 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:26,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:26,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:26,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:26,925 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 12:04:26,926 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:30,571 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:30,572 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [349236302] [2021-05-06 12:04:30,572 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [349236302] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:30,572 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:30,572 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [85] imperfect sequences [] total 85 [2021-05-06 12:04:30,572 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [71985981] [2021-05-06 12:04:30,572 INFO L460 AbstractCegarLoop]: Interpolant automaton has 85 states [2021-05-06 12:04:30,572 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:30,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-05-06 12:04:30,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=7319, Unknown=0, NotChecked=0, Total=7656 [2021-05-06 12:04:30,576 INFO L87 Difference]: Start difference. First operand 171 states and 174 transitions. Second operand has 85 states, 84 states have (on average 1.9642857142857142) internal successors, (165), 83 states have internal predecessors, (165), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:40,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:40,797 INFO L93 Difference]: Finished difference Result 180 states and 185 transitions. [2021-05-06 12:04:40,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-05-06 12:04:40,798 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 84 states have (on average 1.9642857142857142) internal successors, (165), 83 states have internal predecessors, (165), 2 states have call successors, (3), 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 169 [2021-05-06 12:04:40,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:40,799 INFO L225 Difference]: With dead ends: 180 [2021-05-06 12:04:40,799 INFO L226 Difference]: Without dead ends: 173 [2021-05-06 12:04:40,800 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3873 ImplicationChecksByTransitivity, 8769.3ms TimeCoverageRelationStatistics Valid=895, Invalid=27161, Unknown=0, NotChecked=0, Total=28056 [2021-05-06 12:04:40,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-05-06 12:04:40,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 173. [2021-05-06 12:04:40,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 168 states have (on average 1.0238095238095237) internal successors, (172), 168 states have internal predecessors, (172), 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 12:04:40,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 176 transitions. [2021-05-06 12:04:40,810 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 176 transitions. Word has length 169 [2021-05-06 12:04:40,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:40,810 INFO L480 AbstractCegarLoop]: Abstraction has 173 states and 176 transitions. [2021-05-06 12:04:40,810 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 85 states, 84 states have (on average 1.9642857142857142) internal successors, (165), 83 states have internal predecessors, (165), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:40,810 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 176 transitions. [2021-05-06 12:04:40,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2021-05-06 12:04:40,811 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:40,811 INFO L523 BasicCegarLoop]: trace histogram [80, 78, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:40,811 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable232 [2021-05-06 12:04:40,811 INFO L428 AbstractCegarLoop]: === Iteration 81 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:40,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:40,811 INFO L82 PathProgramCache]: Analyzing trace with hash -1694560713, now seen corresponding path program 78 times [2021-05-06 12:04:40,812 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:40,812 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1826015570] [2021-05-06 12:04:40,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:40,819 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:04:40,820 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,823 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,831 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:40,833 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:40,848 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:04:40,861 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:40,863 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:04:40,864 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,867 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:40,876 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:04:40,882 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:40,883 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:40,885 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:04:40,885 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,889 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:40,897 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:04:40,904 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:40,907 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:04:40,908 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,910 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,917 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:40,919 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:40,935 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:04:40,947 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:40,948 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:40,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:41,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:41,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:41,014 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 12:04:41,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:44,726 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:44,727 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1826015570] [2021-05-06 12:04:44,727 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1826015570] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:44,727 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:44,727 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [86] imperfect sequences [] total 86 [2021-05-06 12:04:44,727 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306419091] [2021-05-06 12:04:44,727 INFO L460 AbstractCegarLoop]: Interpolant automaton has 86 states [2021-05-06 12:04:44,727 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:44,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-05-06 12:04:44,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=341, Invalid=7491, Unknown=0, NotChecked=0, Total=7832 [2021-05-06 12:04:44,728 INFO L87 Difference]: Start difference. First operand 173 states and 176 transitions. Second operand has 86 states, 85 states have (on average 1.964705882352941) internal successors, (167), 84 states have internal predecessors, (167), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:55,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:55,168 INFO L93 Difference]: Finished difference Result 182 states and 187 transitions. [2021-05-06 12:04:55,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2021-05-06 12:04:55,168 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 85 states have (on average 1.964705882352941) internal successors, (167), 84 states have internal predecessors, (167), 2 states have call successors, (3), 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 171 [2021-05-06 12:04:55,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:55,169 INFO L225 Difference]: With dead ends: 182 [2021-05-06 12:04:55,169 INFO L226 Difference]: Without dead ends: 175 [2021-05-06 12:04:55,170 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3962 ImplicationChecksByTransitivity, 8849.7ms TimeCoverageRelationStatistics Valid=906, Invalid=27824, Unknown=0, NotChecked=0, Total=28730 [2021-05-06 12:04:55,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2021-05-06 12:04:55,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 175. [2021-05-06 12:04:55,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 170 states have (on average 1.0235294117647058) internal successors, (174), 170 states have internal predecessors, (174), 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 12:04:55,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 178 transitions. [2021-05-06 12:04:55,186 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 178 transitions. Word has length 171 [2021-05-06 12:04:55,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:55,186 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 178 transitions. [2021-05-06 12:04:55,187 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 86 states, 85 states have (on average 1.964705882352941) internal successors, (167), 84 states have internal predecessors, (167), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:55,187 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 178 transitions. [2021-05-06 12:04:55,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-05-06 12:04:55,187 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:55,187 INFO L523 BasicCegarLoop]: trace histogram [81, 79, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:55,188 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable235 [2021-05-06 12:04:55,188 INFO L428 AbstractCegarLoop]: === Iteration 82 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:55,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:55,188 INFO L82 PathProgramCache]: Analyzing trace with hash -443807150, now seen corresponding path program 79 times [2021-05-06 12:04:55,188 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:55,188 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1830104898] [2021-05-06 12:04:55,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:55,195 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:04:55,196 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:55,197 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:55,206 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:55,208 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:55,226 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:04:55,239 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:55,242 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:04:55,243 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:55,247 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:55,256 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:04:55,263 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:55,264 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:55,265 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:04:55,266 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:55,270 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:55,279 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:04:55,286 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:55,290 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:04:55,291 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:55,292 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:55,301 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:55,312 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:55,330 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:04:55,344 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:55,345 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:55,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:55,415 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:55,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:55,418 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 12:04:55,419 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:59,195 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:59,196 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1830104898] [2021-05-06 12:04:59,196 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1830104898] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:59,196 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:59,196 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [87] imperfect sequences [] total 87 [2021-05-06 12:04:59,196 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015073701] [2021-05-06 12:04:59,196 INFO L460 AbstractCegarLoop]: Interpolant automaton has 87 states [2021-05-06 12:04:59,196 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:59,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-05-06 12:04:59,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=345, Invalid=7665, Unknown=0, NotChecked=0, Total=8010 [2021-05-06 12:04:59,197 INFO L87 Difference]: Start difference. First operand 175 states and 178 transitions. Second operand has 87 states, 86 states have (on average 1.9651162790697674) internal successors, (169), 85 states have internal predecessors, (169), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:10,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:10,331 INFO L93 Difference]: Finished difference Result 184 states and 189 transitions. [2021-05-06 12:05:10,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-05-06 12:05:10,331 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 86 states have (on average 1.9651162790697674) internal successors, (169), 85 states have internal predecessors, (169), 2 states have call successors, (3), 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 173 [2021-05-06 12:05:10,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:10,332 INFO L225 Difference]: With dead ends: 184 [2021-05-06 12:05:10,332 INFO L226 Difference]: Without dead ends: 177 [2021-05-06 12:05:10,333 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 85 SyntacticMatches, 1 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4052 ImplicationChecksByTransitivity, 9342.1ms TimeCoverageRelationStatistics Valid=917, Invalid=28495, Unknown=0, NotChecked=0, Total=29412 [2021-05-06 12:05:10,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2021-05-06 12:05:10,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 177. [2021-05-06 12:05:10,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 172 states have (on average 1.0232558139534884) internal successors, (176), 172 states have internal predecessors, (176), 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 12:05:10,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 180 transitions. [2021-05-06 12:05:10,343 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 180 transitions. Word has length 173 [2021-05-06 12:05:10,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:10,344 INFO L480 AbstractCegarLoop]: Abstraction has 177 states and 180 transitions. [2021-05-06 12:05:10,344 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 87 states, 86 states have (on average 1.9651162790697674) internal successors, (169), 85 states have internal predecessors, (169), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:10,344 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 180 transitions. [2021-05-06 12:05:10,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2021-05-06 12:05:10,344 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:10,345 INFO L523 BasicCegarLoop]: trace histogram [82, 80, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:10,345 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable238 [2021-05-06 12:05:10,345 INFO L428 AbstractCegarLoop]: === Iteration 83 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:10,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:10,345 INFO L82 PathProgramCache]: Analyzing trace with hash -1060475987, now seen corresponding path program 80 times [2021-05-06 12:05:10,345 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:10,345 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [430138657] [2021-05-06 12:05:10,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:10,358 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:05:10,359 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:10,360 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:10,368 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:10,370 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:10,386 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:05:10,400 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:10,402 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:05:10,407 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:10,412 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:10,417 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:05:10,424 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:10,424 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:10,426 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:05:10,427 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:10,431 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:10,438 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:05:10,446 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:10,448 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:05:10,449 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:10,450 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:10,459 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:10,460 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:10,475 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:05:10,487 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:10,488 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:10,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:10,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:10,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:10,575 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 12:05:10,576 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:14,787 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:14,787 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [430138657] [2021-05-06 12:05:14,787 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [430138657] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:14,787 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:14,787 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [88] imperfect sequences [] total 88 [2021-05-06 12:05:14,788 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [242132696] [2021-05-06 12:05:14,788 INFO L460 AbstractCegarLoop]: Interpolant automaton has 88 states [2021-05-06 12:05:14,788 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:14,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2021-05-06 12:05:14,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=7841, Unknown=0, NotChecked=0, Total=8190 [2021-05-06 12:05:14,788 INFO L87 Difference]: Start difference. First operand 177 states and 180 transitions. Second operand has 88 states, 87 states have (on average 1.9655172413793103) internal successors, (171), 86 states have internal predecessors, (171), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:26,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:26,154 INFO L93 Difference]: Finished difference Result 186 states and 191 transitions. [2021-05-06 12:05:26,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-05-06 12:05:26,154 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 87 states have (on average 1.9655172413793103) internal successors, (171), 86 states have internal predecessors, (171), 2 states have call successors, (3), 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 175 [2021-05-06 12:05:26,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:26,155 INFO L225 Difference]: With dead ends: 186 [2021-05-06 12:05:26,155 INFO L226 Difference]: Without dead ends: 179 [2021-05-06 12:05:26,156 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 86 SyntacticMatches, 1 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4143 ImplicationChecksByTransitivity, 9704.4ms TimeCoverageRelationStatistics Valid=928, Invalid=29174, Unknown=0, NotChecked=0, Total=30102 [2021-05-06 12:05:26,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-05-06 12:05:26,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2021-05-06 12:05:26,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 174 states have (on average 1.0229885057471264) internal successors, (178), 174 states have internal predecessors, (178), 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 12:05:26,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 182 transitions. [2021-05-06 12:05:26,175 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 182 transitions. Word has length 175 [2021-05-06 12:05:26,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:26,175 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 182 transitions. [2021-05-06 12:05:26,175 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 88 states, 87 states have (on average 1.9655172413793103) internal successors, (171), 86 states have internal predecessors, (171), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:26,175 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 182 transitions. [2021-05-06 12:05:26,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2021-05-06 12:05:26,176 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:26,176 INFO L523 BasicCegarLoop]: trace histogram [83, 81, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:26,176 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable241 [2021-05-06 12:05:26,176 INFO L428 AbstractCegarLoop]: === Iteration 84 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:26,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:26,176 INFO L82 PathProgramCache]: Analyzing trace with hash -973741496, now seen corresponding path program 81 times [2021-05-06 12:05:26,176 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:26,176 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [798841890] [2021-05-06 12:05:26,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:26,182 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:05:26,182 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:26,184 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:26,192 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:26,194 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:26,209 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:05:26,222 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:26,224 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:05:26,228 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:26,232 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:26,236 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:05:26,243 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:26,244 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:26,245 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:05:26,246 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:26,249 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:26,257 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:05:26,264 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:26,267 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:05:26,267 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:26,268 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:26,276 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:26,278 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:26,293 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:05:26,306 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:26,306 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:26,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:26,388 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:26,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:26,391 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 12:05:26,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:30,531 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:30,531 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [798841890] [2021-05-06 12:05:30,531 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [798841890] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:30,531 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:30,531 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [89] imperfect sequences [] total 89 [2021-05-06 12:05:30,531 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321389103] [2021-05-06 12:05:30,532 INFO L460 AbstractCegarLoop]: Interpolant automaton has 89 states [2021-05-06 12:05:30,532 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:30,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2021-05-06 12:05:30,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=8019, Unknown=0, NotChecked=0, Total=8372 [2021-05-06 12:05:30,532 INFO L87 Difference]: Start difference. First operand 179 states and 182 transitions. Second operand has 89 states, 88 states have (on average 1.9659090909090908) internal successors, (173), 87 states have internal predecessors, (173), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:41,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:41,921 INFO L93 Difference]: Finished difference Result 188 states and 193 transitions. [2021-05-06 12:05:41,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-05-06 12:05:41,922 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 88 states have (on average 1.9659090909090908) internal successors, (173), 87 states have internal predecessors, (173), 2 states have call successors, (3), 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 177 [2021-05-06 12:05:41,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:41,922 INFO L225 Difference]: With dead ends: 188 [2021-05-06 12:05:41,922 INFO L226 Difference]: Without dead ends: 181 [2021-05-06 12:05:41,923 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 87 SyntacticMatches, 1 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4235 ImplicationChecksByTransitivity, 9687.3ms TimeCoverageRelationStatistics Valid=939, Invalid=29861, Unknown=0, NotChecked=0, Total=30800 [2021-05-06 12:05:41,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2021-05-06 12:05:41,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 181. [2021-05-06 12:05:41,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 176 states have (on average 1.0227272727272727) internal successors, (180), 176 states have internal predecessors, (180), 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 12:05:41,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 184 transitions. [2021-05-06 12:05:41,934 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 184 transitions. Word has length 177 [2021-05-06 12:05:41,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:41,934 INFO L480 AbstractCegarLoop]: Abstraction has 181 states and 184 transitions. [2021-05-06 12:05:41,934 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 89 states, 88 states have (on average 1.9659090909090908) internal successors, (173), 87 states have internal predecessors, (173), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:41,934 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 184 transitions. [2021-05-06 12:05:41,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2021-05-06 12:05:41,935 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:41,935 INFO L523 BasicCegarLoop]: trace histogram [84, 82, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:41,935 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable244 [2021-05-06 12:05:41,935 INFO L428 AbstractCegarLoop]: === Iteration 85 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:41,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:41,935 INFO L82 PathProgramCache]: Analyzing trace with hash 773725731, now seen corresponding path program 82 times [2021-05-06 12:05:41,935 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:41,936 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [500534458] [2021-05-06 12:05:41,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:41,941 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:05:41,942 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:41,943 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:41,951 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:41,952 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:41,968 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:05:41,980 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:41,982 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:05:41,983 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:41,986 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:41,995 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:05:42,001 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:42,006 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:42,008 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:05:42,013 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:42,020 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:42,024 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:05:42,031 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:42,034 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:05:42,046 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:42,047 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:42,060 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:42,062 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:42,070 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:05:42,082 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:42,083 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:42,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:42,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:42,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:42,160 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 12:05:42,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:46,354 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:46,355 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [500534458] [2021-05-06 12:05:46,355 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [500534458] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:46,355 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:46,355 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [90] imperfect sequences [] total 90 [2021-05-06 12:05:46,355 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667365490] [2021-05-06 12:05:46,355 INFO L460 AbstractCegarLoop]: Interpolant automaton has 90 states [2021-05-06 12:05:46,355 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:46,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2021-05-06 12:05:46,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=8199, Unknown=0, NotChecked=0, Total=8556 [2021-05-06 12:05:46,356 INFO L87 Difference]: Start difference. First operand 181 states and 184 transitions. Second operand has 90 states, 89 states have (on average 1.9662921348314606) internal successors, (175), 88 states have internal predecessors, (175), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:58,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:58,035 INFO L93 Difference]: Finished difference Result 190 states and 195 transitions. [2021-05-06 12:05:58,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2021-05-06 12:05:58,035 INFO L78 Accepts]: Start accepts. Automaton has has 90 states, 89 states have (on average 1.9662921348314606) internal successors, (175), 88 states have internal predecessors, (175), 2 states have call successors, (3), 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 179 [2021-05-06 12:05:58,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:58,036 INFO L225 Difference]: With dead ends: 190 [2021-05-06 12:05:58,036 INFO L226 Difference]: Without dead ends: 183 [2021-05-06 12:05:58,037 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 88 SyntacticMatches, 1 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4328 ImplicationChecksByTransitivity, 9910.4ms TimeCoverageRelationStatistics Valid=950, Invalid=30556, Unknown=0, NotChecked=0, Total=31506 [2021-05-06 12:05:58,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2021-05-06 12:05:58,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 183. [2021-05-06 12:05:58,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 178 states have (on average 1.0224719101123596) internal successors, (182), 178 states have internal predecessors, (182), 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 12:05:58,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 186 transitions. [2021-05-06 12:05:58,048 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 186 transitions. Word has length 179 [2021-05-06 12:05:58,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:58,048 INFO L480 AbstractCegarLoop]: Abstraction has 183 states and 186 transitions. [2021-05-06 12:05:58,049 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 90 states, 89 states have (on average 1.9662921348314606) internal successors, (175), 88 states have internal predecessors, (175), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:58,049 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 186 transitions. [2021-05-06 12:05:58,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2021-05-06 12:05:58,049 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:58,049 INFO L523 BasicCegarLoop]: trace histogram [85, 83, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:58,050 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable247 [2021-05-06 12:05:58,050 INFO L428 AbstractCegarLoop]: === Iteration 86 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:58,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:58,050 INFO L82 PathProgramCache]: Analyzing trace with hash 757518142, now seen corresponding path program 83 times [2021-05-06 12:05:58,050 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:58,050 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [311341563] [2021-05-06 12:05:58,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:58,060 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:05:58,060 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:58,061 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:58,068 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:58,070 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:58,084 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:05:58,096 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:58,098 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:05:58,098 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:58,102 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:58,109 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:05:58,116 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:58,116 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:58,118 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:05:58,118 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:58,121 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:58,129 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:05:58,135 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:58,138 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:05:58,146 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:58,147 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:58,155 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:58,156 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:58,163 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:05:58,176 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:58,176 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:58,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:58,252 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:58,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:58,255 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 12:05:58,256 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:02,568 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:02,568 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [311341563] [2021-05-06 12:06:02,568 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [311341563] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:02,568 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:02,568 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [91] imperfect sequences [] total 91 [2021-05-06 12:06:02,568 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999644343] [2021-05-06 12:06:02,569 INFO L460 AbstractCegarLoop]: Interpolant automaton has 91 states [2021-05-06 12:06:02,569 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:02,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2021-05-06 12:06:02,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=361, Invalid=8381, Unknown=0, NotChecked=0, Total=8742 [2021-05-06 12:06:02,569 INFO L87 Difference]: Start difference. First operand 183 states and 186 transitions. Second operand has 91 states, 90 states have (on average 1.9666666666666666) internal successors, (177), 89 states have internal predecessors, (177), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:14,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:14,113 INFO L93 Difference]: Finished difference Result 192 states and 197 transitions. [2021-05-06 12:06:14,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2021-05-06 12:06:14,113 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 90 states have (on average 1.9666666666666666) internal successors, (177), 89 states have internal predecessors, (177), 2 states have call successors, (3), 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 181 [2021-05-06 12:06:14,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:14,114 INFO L225 Difference]: With dead ends: 192 [2021-05-06 12:06:14,114 INFO L226 Difference]: Without dead ends: 185 [2021-05-06 12:06:14,115 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 89 SyntacticMatches, 1 SemanticMatches, 178 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4422 ImplicationChecksByTransitivity, 10023.9ms TimeCoverageRelationStatistics Valid=961, Invalid=31259, Unknown=0, NotChecked=0, Total=32220 [2021-05-06 12:06:14,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-05-06 12:06:14,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 185. [2021-05-06 12:06:14,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 180 states have (on average 1.0222222222222221) internal successors, (184), 180 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 12:06:14,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 188 transitions. [2021-05-06 12:06:14,132 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 188 transitions. Word has length 181 [2021-05-06 12:06:14,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:14,132 INFO L480 AbstractCegarLoop]: Abstraction has 185 states and 188 transitions. [2021-05-06 12:06:14,133 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 91 states, 90 states have (on average 1.9666666666666666) internal successors, (177), 89 states have internal predecessors, (177), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:14,133 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 188 transitions. [2021-05-06 12:06:14,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2021-05-06 12:06:14,140 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:14,140 INFO L523 BasicCegarLoop]: trace histogram [86, 84, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:14,140 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable250 [2021-05-06 12:06:14,140 INFO L428 AbstractCegarLoop]: === Iteration 87 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:14,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:14,140 INFO L82 PathProgramCache]: Analyzing trace with hash -1933072999, now seen corresponding path program 84 times [2021-05-06 12:06:14,141 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:14,141 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [606220930] [2021-05-06 12:06:14,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:14,148 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:06:14,149 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:14,150 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:14,157 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:14,159 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:14,174 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:06:14,186 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:14,188 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:06:14,192 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:14,196 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:14,200 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:06:14,206 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:14,207 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:14,212 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:06:14,218 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:14,222 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:14,226 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:06:14,232 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:14,235 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:06:14,245 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:14,246 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:14,253 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:14,255 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:14,262 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:06:14,275 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:14,275 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:14,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:14,345 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:14,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:14,348 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 12:06:14,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:18,615 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:18,615 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [606220930] [2021-05-06 12:06:18,615 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [606220930] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:18,615 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:18,615 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [92] imperfect sequences [] total 92 [2021-05-06 12:06:18,615 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543918991] [2021-05-06 12:06:18,615 INFO L460 AbstractCegarLoop]: Interpolant automaton has 92 states [2021-05-06 12:06:18,616 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:18,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2021-05-06 12:06:18,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=365, Invalid=8565, Unknown=0, NotChecked=0, Total=8930 [2021-05-06 12:06:18,616 INFO L87 Difference]: Start difference. First operand 185 states and 188 transitions. Second operand has 92 states, 91 states have (on average 1.967032967032967) internal successors, (179), 90 states have internal predecessors, (179), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:30,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:30,580 INFO L93 Difference]: Finished difference Result 194 states and 199 transitions. [2021-05-06 12:06:30,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-05-06 12:06:30,580 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 91 states have (on average 1.967032967032967) internal successors, (179), 90 states have internal predecessors, (179), 2 states have call successors, (3), 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 183 [2021-05-06 12:06:30,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:30,581 INFO L225 Difference]: With dead ends: 194 [2021-05-06 12:06:30,581 INFO L226 Difference]: Without dead ends: 187 [2021-05-06 12:06:30,582 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 90 SyntacticMatches, 1 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4517 ImplicationChecksByTransitivity, 10170.5ms TimeCoverageRelationStatistics Valid=972, Invalid=31970, Unknown=0, NotChecked=0, Total=32942 [2021-05-06 12:06:30,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-05-06 12:06:30,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2021-05-06 12:06:30,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 182 states have (on average 1.021978021978022) internal successors, (186), 182 states have internal predecessors, (186), 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 12:06:30,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 190 transitions. [2021-05-06 12:06:30,599 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 190 transitions. Word has length 183 [2021-05-06 12:06:30,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:30,600 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 190 transitions. [2021-05-06 12:06:30,600 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 92 states, 91 states have (on average 1.967032967032967) internal successors, (179), 90 states have internal predecessors, (179), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:30,600 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 190 transitions. [2021-05-06 12:06:30,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2021-05-06 12:06:30,600 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:30,601 INFO L523 BasicCegarLoop]: trace histogram [87, 85, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:30,601 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable253 [2021-05-06 12:06:30,601 INFO L428 AbstractCegarLoop]: === Iteration 88 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:30,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:30,601 INFO L82 PathProgramCache]: Analyzing trace with hash -2020847308, now seen corresponding path program 85 times [2021-05-06 12:06:30,601 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:30,601 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1085283564] [2021-05-06 12:06:30,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:30,608 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:06:30,609 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:30,613 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:30,621 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:30,623 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:30,640 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:06:30,653 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:30,656 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:06:30,657 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:30,661 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:30,669 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:06:30,677 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:30,677 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:30,679 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:06:30,684 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:30,688 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:30,699 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:06:30,706 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:30,710 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:06:30,721 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:30,728 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:30,738 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:30,741 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:30,750 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:06:30,762 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:30,763 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:30,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:30,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:30,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:30,833 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 12:06:30,835 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:35,155 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:35,155 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1085283564] [2021-05-06 12:06:35,155 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1085283564] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:35,155 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:35,155 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [93] imperfect sequences [] total 93 [2021-05-06 12:06:35,155 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161419312] [2021-05-06 12:06:35,156 INFO L460 AbstractCegarLoop]: Interpolant automaton has 93 states [2021-05-06 12:06:35,156 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:35,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2021-05-06 12:06:35,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=369, Invalid=8751, Unknown=0, NotChecked=0, Total=9120 [2021-05-06 12:06:35,156 INFO L87 Difference]: Start difference. First operand 187 states and 190 transitions. Second operand has 93 states, 92 states have (on average 1.9673913043478262) internal successors, (181), 91 states have internal predecessors, (181), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:47,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:47,122 INFO L93 Difference]: Finished difference Result 196 states and 201 transitions. [2021-05-06 12:06:47,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2021-05-06 12:06:47,123 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 92 states have (on average 1.9673913043478262) internal successors, (181), 91 states have internal predecessors, (181), 2 states have call successors, (3), 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 185 [2021-05-06 12:06:47,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:47,123 INFO L225 Difference]: With dead ends: 196 [2021-05-06 12:06:47,123 INFO L226 Difference]: Without dead ends: 189 [2021-05-06 12:06:47,124 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 91 SyntacticMatches, 1 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4613 ImplicationChecksByTransitivity, 10178.5ms TimeCoverageRelationStatistics Valid=983, Invalid=32689, Unknown=0, NotChecked=0, Total=33672 [2021-05-06 12:06:47,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2021-05-06 12:06:47,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 189. [2021-05-06 12:06:47,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 184 states have (on average 1.0217391304347827) internal successors, (188), 184 states have internal predecessors, (188), 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 12:06:47,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 192 transitions. [2021-05-06 12:06:47,135 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 192 transitions. Word has length 185 [2021-05-06 12:06:47,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:47,135 INFO L480 AbstractCegarLoop]: Abstraction has 189 states and 192 transitions. [2021-05-06 12:06:47,136 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 93 states, 92 states have (on average 1.9673913043478262) internal successors, (181), 91 states have internal predecessors, (181), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:47,136 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 192 transitions. [2021-05-06 12:06:47,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2021-05-06 12:06:47,136 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:47,136 INFO L523 BasicCegarLoop]: trace histogram [88, 86, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:47,136 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable256 [2021-05-06 12:06:47,136 INFO L428 AbstractCegarLoop]: === Iteration 89 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:47,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:47,137 INFO L82 PathProgramCache]: Analyzing trace with hash -472612337, now seen corresponding path program 86 times [2021-05-06 12:06:47,137 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:47,137 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1475924546] [2021-05-06 12:06:47,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:47,146 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:06:47,147 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:47,148 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:47,155 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:47,157 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:47,171 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:06:47,183 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:47,185 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:06:47,189 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:47,192 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:47,196 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:06:47,202 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:47,203 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:47,204 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:06:47,205 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:47,208 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:47,216 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:06:47,222 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:47,225 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:06:47,234 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:47,236 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:47,242 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:47,244 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:47,252 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:06:47,264 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:47,265 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:47,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:47,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:47,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:47,332 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 12:06:47,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:51,679 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:51,679 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1475924546] [2021-05-06 12:06:51,679 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1475924546] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:51,679 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:51,679 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [94] imperfect sequences [] total 94 [2021-05-06 12:06:51,679 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865339991] [2021-05-06 12:06:51,680 INFO L460 AbstractCegarLoop]: Interpolant automaton has 94 states [2021-05-06 12:06:51,680 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:51,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2021-05-06 12:06:51,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=373, Invalid=8939, Unknown=0, NotChecked=0, Total=9312 [2021-05-06 12:06:51,680 INFO L87 Difference]: Start difference. First operand 189 states and 192 transitions. Second operand has 94 states, 93 states have (on average 1.967741935483871) internal successors, (183), 92 states have internal predecessors, (183), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:03,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:03,991 INFO L93 Difference]: Finished difference Result 198 states and 203 transitions. [2021-05-06 12:07:03,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2021-05-06 12:07:03,991 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 93 states have (on average 1.967741935483871) internal successors, (183), 92 states have internal predecessors, (183), 2 states have call successors, (3), 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 187 [2021-05-06 12:07:03,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:03,992 INFO L225 Difference]: With dead ends: 198 [2021-05-06 12:07:03,992 INFO L226 Difference]: Without dead ends: 191 [2021-05-06 12:07:03,993 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4710 ImplicationChecksByTransitivity, 10322.4ms TimeCoverageRelationStatistics Valid=994, Invalid=33416, Unknown=0, NotChecked=0, Total=34410 [2021-05-06 12:07:03,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-05-06 12:07:04,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 191. [2021-05-06 12:07:04,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 186 states have (on average 1.021505376344086) internal successors, (190), 186 states have internal predecessors, (190), 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 12:07:04,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 194 transitions. [2021-05-06 12:07:04,004 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 194 transitions. Word has length 187 [2021-05-06 12:07:04,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:04,004 INFO L480 AbstractCegarLoop]: Abstraction has 191 states and 194 transitions. [2021-05-06 12:07:04,004 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 94 states, 93 states have (on average 1.967741935483871) internal successors, (183), 92 states have internal predecessors, (183), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:04,004 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 194 transitions. [2021-05-06 12:07:04,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2021-05-06 12:07:04,005 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:04,005 INFO L523 BasicCegarLoop]: trace histogram [89, 87, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:04,005 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable259 [2021-05-06 12:07:04,005 INFO L428 AbstractCegarLoop]: === Iteration 90 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:04,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:04,005 INFO L82 PathProgramCache]: Analyzing trace with hash 1322510378, now seen corresponding path program 87 times [2021-05-06 12:07:04,005 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:04,006 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [339548187] [2021-05-06 12:07:04,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:04,011 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:07:04,021 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:04,022 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:04,029 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:04,031 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:04,038 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:07:04,050 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:04,053 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:07:04,053 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:04,057 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:07:04,064 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:07:04,071 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:04,072 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:04,073 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:07:04,074 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:04,078 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:07:04,085 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:07:04,092 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:04,095 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:07:04,104 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:04,105 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:04,123 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:04,125 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:04,133 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:07:04,145 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:04,146 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:04,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:04,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:04,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:04,215 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 12:07:04,216 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:08,697 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:08,697 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [339548187] [2021-05-06 12:07:08,698 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [339548187] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:08,698 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:08,698 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [95] imperfect sequences [] total 95 [2021-05-06 12:07:08,698 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [172608875] [2021-05-06 12:07:08,698 INFO L460 AbstractCegarLoop]: Interpolant automaton has 95 states [2021-05-06 12:07:08,698 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:08,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2021-05-06 12:07:08,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=377, Invalid=9129, Unknown=0, NotChecked=0, Total=9506 [2021-05-06 12:07:08,699 INFO L87 Difference]: Start difference. First operand 191 states and 194 transitions. Second operand has 95 states, 94 states have (on average 1.9680851063829787) internal successors, (185), 93 states have internal predecessors, (185), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:21,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:21,375 INFO L93 Difference]: Finished difference Result 200 states and 205 transitions. [2021-05-06 12:07:21,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2021-05-06 12:07:21,375 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 94 states have (on average 1.9680851063829787) internal successors, (185), 93 states have internal predecessors, (185), 2 states have call successors, (3), 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 189 [2021-05-06 12:07:21,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:21,376 INFO L225 Difference]: With dead ends: 200 [2021-05-06 12:07:21,376 INFO L226 Difference]: Without dead ends: 193 [2021-05-06 12:07:21,377 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 93 SyntacticMatches, 1 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4808 ImplicationChecksByTransitivity, 10583.4ms TimeCoverageRelationStatistics Valid=1005, Invalid=34151, Unknown=0, NotChecked=0, Total=35156 [2021-05-06 12:07:21,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-05-06 12:07:21,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 193. [2021-05-06 12:07:21,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 188 states have (on average 1.0212765957446808) internal successors, (192), 188 states have internal predecessors, (192), 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 12:07:21,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 196 transitions. [2021-05-06 12:07:21,388 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 196 transitions. Word has length 189 [2021-05-06 12:07:21,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:21,388 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 196 transitions. [2021-05-06 12:07:21,389 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 95 states, 94 states have (on average 1.9680851063829787) internal successors, (185), 93 states have internal predecessors, (185), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:21,389 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 196 transitions. [2021-05-06 12:07:21,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-05-06 12:07:21,389 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:21,389 INFO L523 BasicCegarLoop]: trace histogram [90, 88, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:21,389 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable262 [2021-05-06 12:07:21,389 INFO L428 AbstractCegarLoop]: === Iteration 91 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:21,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:21,390 INFO L82 PathProgramCache]: Analyzing trace with hash -141413499, now seen corresponding path program 88 times [2021-05-06 12:07:21,390 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:21,390 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2138933942] [2021-05-06 12:07:21,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:21,395 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:07:21,396 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:21,397 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:21,404 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:21,406 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:21,419 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:07:21,436 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:21,438 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:07:21,439 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:21,442 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:07:21,450 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:07:21,456 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:21,457 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:21,458 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:07:21,462 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:21,466 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:07:21,469 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:07:21,476 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:21,478 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:07:21,479 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:21,480 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:21,488 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:21,489 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:21,504 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:07:21,516 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:21,517 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:21,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:21,584 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:21,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:21,586 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 12:07:21,588 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:26,271 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:26,271 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2138933942] [2021-05-06 12:07:26,271 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2138933942] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:26,271 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:26,271 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [96] imperfect sequences [] total 96 [2021-05-06 12:07:26,271 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390219602] [2021-05-06 12:07:26,272 INFO L460 AbstractCegarLoop]: Interpolant automaton has 96 states [2021-05-06 12:07:26,272 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:26,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2021-05-06 12:07:26,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=381, Invalid=9321, Unknown=0, NotChecked=0, Total=9702 [2021-05-06 12:07:26,272 INFO L87 Difference]: Start difference. First operand 193 states and 196 transitions. Second operand has 96 states, 95 states have (on average 1.9684210526315788) internal successors, (187), 94 states have internal predecessors, (187), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:38,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:38,952 INFO L93 Difference]: Finished difference Result 202 states and 207 transitions. [2021-05-06 12:07:38,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2021-05-06 12:07:38,952 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 95 states have (on average 1.9684210526315788) internal successors, (187), 94 states have internal predecessors, (187), 2 states have call successors, (3), 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 191 [2021-05-06 12:07:38,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:38,953 INFO L225 Difference]: With dead ends: 202 [2021-05-06 12:07:38,953 INFO L226 Difference]: Without dead ends: 195 [2021-05-06 12:07:38,954 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4907 ImplicationChecksByTransitivity, 10895.8ms TimeCoverageRelationStatistics Valid=1016, Invalid=34894, Unknown=0, NotChecked=0, Total=35910 [2021-05-06 12:07:38,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2021-05-06 12:07:38,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 195. [2021-05-06 12:07:38,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 190 states have (on average 1.0210526315789474) internal successors, (194), 190 states have internal predecessors, (194), 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 12:07:38,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 198 transitions. [2021-05-06 12:07:38,965 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 198 transitions. Word has length 191 [2021-05-06 12:07:38,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:38,966 INFO L480 AbstractCegarLoop]: Abstraction has 195 states and 198 transitions. [2021-05-06 12:07:38,966 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 96 states, 95 states have (on average 1.9684210526315788) internal successors, (187), 94 states have internal predecessors, (187), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:38,966 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 198 transitions. [2021-05-06 12:07:38,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2021-05-06 12:07:38,966 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:38,966 INFO L523 BasicCegarLoop]: trace histogram [91, 89, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:38,966 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable265 [2021-05-06 12:07:38,966 INFO L428 AbstractCegarLoop]: === Iteration 92 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:38,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:38,967 INFO L82 PathProgramCache]: Analyzing trace with hash 1777013792, now seen corresponding path program 89 times [2021-05-06 12:07:38,967 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:38,967 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1447992787] [2021-05-06 12:07:38,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:38,973 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:07:38,982 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:38,983 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:38,990 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:38,992 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:38,999 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:07:39,011 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:39,014 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:07:39,018 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:39,022 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:07:39,026 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:07:39,032 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:39,033 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:39,035 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:07:39,035 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:39,039 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:07:39,047 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:07:39,053 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:39,056 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:07:39,065 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:39,067 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:39,074 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:39,076 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:39,084 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:07:39,096 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:39,097 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:39,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:39,177 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:39,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:39,180 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 12:07:39,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:43,947 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:43,947 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1447992787] [2021-05-06 12:07:43,947 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1447992787] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:43,947 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:43,947 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [97] imperfect sequences [] total 97 [2021-05-06 12:07:43,947 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183428365] [2021-05-06 12:07:43,953 INFO L460 AbstractCegarLoop]: Interpolant automaton has 97 states [2021-05-06 12:07:43,954 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:43,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-05-06 12:07:43,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=385, Invalid=9515, Unknown=0, NotChecked=0, Total=9900 [2021-05-06 12:07:43,954 INFO L87 Difference]: Start difference. First operand 195 states and 198 transitions. Second operand has 97 states, 96 states have (on average 1.96875) internal successors, (189), 95 states have internal predecessors, (189), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:56,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:56,985 INFO L93 Difference]: Finished difference Result 204 states and 209 transitions. [2021-05-06 12:07:56,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2021-05-06 12:07:56,986 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 96 states have (on average 1.96875) internal successors, (189), 95 states have internal predecessors, (189), 2 states have call successors, (3), 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 193 [2021-05-06 12:07:56,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:56,986 INFO L225 Difference]: With dead ends: 204 [2021-05-06 12:07:56,986 INFO L226 Difference]: Without dead ends: 197 [2021-05-06 12:07:56,988 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 95 SyntacticMatches, 1 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5007 ImplicationChecksByTransitivity, 11053.0ms TimeCoverageRelationStatistics Valid=1027, Invalid=35645, Unknown=0, NotChecked=0, Total=36672 [2021-05-06 12:07:56,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-05-06 12:07:57,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 197. [2021-05-06 12:07:57,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 192 states have (on average 1.0208333333333333) internal successors, (196), 192 states have internal predecessors, (196), 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 12:07:57,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 200 transitions. [2021-05-06 12:07:57,005 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 200 transitions. Word has length 193 [2021-05-06 12:07:57,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:57,005 INFO L480 AbstractCegarLoop]: Abstraction has 197 states and 200 transitions. [2021-05-06 12:07:57,005 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 97 states, 96 states have (on average 1.96875) internal successors, (189), 95 states have internal predecessors, (189), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:57,006 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 200 transitions. [2021-05-06 12:07:57,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2021-05-06 12:07:57,006 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:57,006 INFO L523 BasicCegarLoop]: trace histogram [92, 90, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:57,006 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable268 [2021-05-06 12:07:57,007 INFO L428 AbstractCegarLoop]: === Iteration 93 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:57,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:57,007 INFO L82 PathProgramCache]: Analyzing trace with hash -1450296837, now seen corresponding path program 90 times [2021-05-06 12:07:57,007 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:57,007 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1464002886] [2021-05-06 12:07:57,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:57,014 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:07:57,015 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:57,016 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:57,025 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:57,027 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:57,043 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:07:57,057 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:57,060 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:07:57,060 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:57,064 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:07:57,073 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:07:57,081 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:57,081 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:57,083 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:07:57,088 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:57,092 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:07:57,097 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:07:57,104 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:57,107 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:07:57,107 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:57,108 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:57,116 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:57,118 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:57,133 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:07:57,145 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:57,145 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:57,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:57,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:57,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:57,219 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 12:07:57,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:01,877 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:01,878 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1464002886] [2021-05-06 12:08:01,878 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1464002886] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:01,878 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:01,878 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [98] imperfect sequences [] total 98 [2021-05-06 12:08:01,878 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1004866865] [2021-05-06 12:08:01,878 INFO L460 AbstractCegarLoop]: Interpolant automaton has 98 states [2021-05-06 12:08:01,878 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:01,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-05-06 12:08:01,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=389, Invalid=9711, Unknown=0, NotChecked=0, Total=10100 [2021-05-06 12:08:01,879 INFO L87 Difference]: Start difference. First operand 197 states and 200 transitions. Second operand has 98 states, 97 states have (on average 1.9690721649484537) internal successors, (191), 96 states have internal predecessors, (191), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:08:14,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:14,951 INFO L93 Difference]: Finished difference Result 206 states and 211 transitions. [2021-05-06 12:08:14,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-05-06 12:08:14,952 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 97 states have (on average 1.9690721649484537) internal successors, (191), 96 states have internal predecessors, (191), 2 states have call successors, (3), 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 195 [2021-05-06 12:08:14,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:14,953 INFO L225 Difference]: With dead ends: 206 [2021-05-06 12:08:14,953 INFO L226 Difference]: Without dead ends: 199 [2021-05-06 12:08:14,954 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 96 SyntacticMatches, 1 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5108 ImplicationChecksByTransitivity, 11074.0ms TimeCoverageRelationStatistics Valid=1038, Invalid=36404, Unknown=0, NotChecked=0, Total=37442 [2021-05-06 12:08:14,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2021-05-06 12:08:14,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 199. [2021-05-06 12:08:14,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 194 states have (on average 1.0206185567010309) internal successors, (198), 194 states have internal predecessors, (198), 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 12:08:14,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 202 transitions. [2021-05-06 12:08:14,967 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 202 transitions. Word has length 195 [2021-05-06 12:08:14,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:14,967 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 202 transitions. [2021-05-06 12:08:14,967 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 98 states, 97 states have (on average 1.9690721649484537) internal successors, (191), 96 states have internal predecessors, (191), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:08:14,967 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 202 transitions. [2021-05-06 12:08:14,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2021-05-06 12:08:14,968 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:14,968 INFO L523 BasicCegarLoop]: trace histogram [93, 91, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:14,968 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable271 [2021-05-06 12:08:14,968 INFO L428 AbstractCegarLoop]: === Iteration 94 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:14,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:14,969 INFO L82 PathProgramCache]: Analyzing trace with hash -1929423594, now seen corresponding path program 91 times [2021-05-06 12:08:14,969 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:14,969 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1472523082] [2021-05-06 12:08:14,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:14,976 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:08:14,987 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:14,989 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:14,997 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:14,999 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:15,008 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:08:15,021 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:15,024 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:08:15,029 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:15,033 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:08:15,038 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:08:15,045 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:15,046 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:15,048 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:08:15,053 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:15,057 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:08:15,061 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:08:15,068 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:15,072 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:08:15,083 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:15,084 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:15,092 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:15,094 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:15,103 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:08:15,117 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:15,118 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:15,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:15,194 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:15,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:15,197 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 12:08:15,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:20,077 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:20,077 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1472523082] [2021-05-06 12:08:20,077 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1472523082] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:20,077 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:20,077 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [99] imperfect sequences [] total 99 [2021-05-06 12:08:20,077 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077953408] [2021-05-06 12:08:20,078 INFO L460 AbstractCegarLoop]: Interpolant automaton has 99 states [2021-05-06 12:08:20,078 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:20,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2021-05-06 12:08:20,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=393, Invalid=9909, Unknown=0, NotChecked=0, Total=10302 [2021-05-06 12:08:20,079 INFO L87 Difference]: Start difference. First operand 199 states and 202 transitions. Second operand has 99 states, 98 states have (on average 1.969387755102041) internal successors, (193), 97 states have internal predecessors, (193), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:08:33,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:33,657 INFO L93 Difference]: Finished difference Result 208 states and 213 transitions. [2021-05-06 12:08:33,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2021-05-06 12:08:33,657 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 98 states have (on average 1.969387755102041) internal successors, (193), 97 states have internal predecessors, (193), 2 states have call successors, (3), 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 197 [2021-05-06 12:08:33,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:33,658 INFO L225 Difference]: With dead ends: 208 [2021-05-06 12:08:33,658 INFO L226 Difference]: Without dead ends: 201 [2021-05-06 12:08:33,659 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 97 SyntacticMatches, 1 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5210 ImplicationChecksByTransitivity, 11443.9ms TimeCoverageRelationStatistics Valid=1049, Invalid=37171, Unknown=0, NotChecked=0, Total=38220 [2021-05-06 12:08:33,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2021-05-06 12:08:33,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 201. [2021-05-06 12:08:33,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 196 states have (on average 1.0204081632653061) internal successors, (200), 196 states have internal predecessors, (200), 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 12:08:33,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 204 transitions. [2021-05-06 12:08:33,671 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 204 transitions. Word has length 197 [2021-05-06 12:08:33,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:33,671 INFO L480 AbstractCegarLoop]: Abstraction has 201 states and 204 transitions. [2021-05-06 12:08:33,671 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 99 states, 98 states have (on average 1.969387755102041) internal successors, (193), 97 states have internal predecessors, (193), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:08:33,672 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 204 transitions. [2021-05-06 12:08:33,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2021-05-06 12:08:33,672 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:33,672 INFO L523 BasicCegarLoop]: trace histogram [94, 92, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:33,672 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable274 [2021-05-06 12:08:33,672 INFO L428 AbstractCegarLoop]: === Iteration 95 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:33,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:33,673 INFO L82 PathProgramCache]: Analyzing trace with hash 1486230897, now seen corresponding path program 92 times [2021-05-06 12:08:33,673 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:33,673 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [118478914] [2021-05-06 12:08:33,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:33,678 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:08:33,688 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:33,689 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:33,696 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:33,698 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:33,705 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:08:33,717 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:33,722 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:08:33,727 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:33,739 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:08:33,745 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:08:33,754 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:33,755 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:33,757 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:08:33,758 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:33,763 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:08:33,770 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:08:33,777 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:33,780 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:08:33,789 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:33,790 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:33,797 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:33,799 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:33,806 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:08:33,819 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:33,819 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:33,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:33,890 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:33,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:33,893 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 12:08:33,894 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:38,807 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:38,807 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [118478914] [2021-05-06 12:08:38,807 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [118478914] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:38,807 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:38,807 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [100] imperfect sequences [] total 100 [2021-05-06 12:08:38,807 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1659027562] [2021-05-06 12:08:38,807 INFO L460 AbstractCegarLoop]: Interpolant automaton has 100 states [2021-05-06 12:08:38,808 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:38,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2021-05-06 12:08:38,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=10109, Unknown=0, NotChecked=0, Total=10506 [2021-05-06 12:08:38,808 INFO L87 Difference]: Start difference. First operand 201 states and 204 transitions. Second operand has 100 states, 99 states have (on average 1.9696969696969697) internal successors, (195), 98 states have internal predecessors, (195), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:08:52,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:52,424 INFO L93 Difference]: Finished difference Result 210 states and 215 transitions. [2021-05-06 12:08:52,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2021-05-06 12:08:52,424 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 99 states have (on average 1.9696969696969697) internal successors, (195), 98 states have internal predecessors, (195), 2 states have call successors, (3), 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 199 [2021-05-06 12:08:52,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:52,425 INFO L225 Difference]: With dead ends: 210 [2021-05-06 12:08:52,425 INFO L226 Difference]: Without dead ends: 203 [2021-05-06 12:08:52,426 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 98 SyntacticMatches, 1 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5313 ImplicationChecksByTransitivity, 11577.5ms TimeCoverageRelationStatistics Valid=1060, Invalid=37946, Unknown=0, NotChecked=0, Total=39006 [2021-05-06 12:08:52,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2021-05-06 12:08:52,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 203. [2021-05-06 12:08:52,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 198 states have (on average 1.02020202020202) internal successors, (202), 198 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 12:08:52,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 206 transitions. [2021-05-06 12:08:52,438 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 206 transitions. Word has length 199 [2021-05-06 12:08:52,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:52,438 INFO L480 AbstractCegarLoop]: Abstraction has 203 states and 206 transitions. [2021-05-06 12:08:52,438 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 100 states, 99 states have (on average 1.9696969696969697) internal successors, (195), 98 states have internal predecessors, (195), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:08:52,438 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 206 transitions. [2021-05-06 12:08:52,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2021-05-06 12:08:52,439 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:52,439 INFO L523 BasicCegarLoop]: trace histogram [95, 93, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:52,439 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable277 [2021-05-06 12:08:52,439 INFO L428 AbstractCegarLoop]: === Iteration 96 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:52,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:52,439 INFO L82 PathProgramCache]: Analyzing trace with hash -1719784692, now seen corresponding path program 93 times [2021-05-06 12:08:52,439 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:52,439 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1839179573] [2021-05-06 12:08:52,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:52,447 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:08:52,456 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:52,457 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:52,464 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:52,466 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:52,473 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:08:52,485 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:52,487 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:08:52,491 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:52,495 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:08:52,498 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:08:52,505 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:52,505 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:52,507 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:08:52,511 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:52,514 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:08:52,518 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:08:52,524 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:52,527 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:08:52,535 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:52,537 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:52,543 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:52,545 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:52,553 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:08:52,565 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:52,566 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:52,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:52,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:52,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:52,626 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 12:08:52,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:57,545 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:57,545 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1839179573] [2021-05-06 12:08:57,546 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1839179573] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:57,546 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:57,546 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [101] imperfect sequences [] total 101 [2021-05-06 12:08:57,546 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302871919] [2021-05-06 12:08:57,546 INFO L460 AbstractCegarLoop]: Interpolant automaton has 101 states [2021-05-06 12:08:57,546 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:57,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2021-05-06 12:08:57,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=401, Invalid=10311, Unknown=0, NotChecked=0, Total=10712 [2021-05-06 12:08:57,547 INFO L87 Difference]: Start difference. First operand 203 states and 206 transitions. Second operand has 101 states, 100 states have (on average 1.97) internal successors, (197), 99 states have internal predecessors, (197), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:09:11,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:11,260 INFO L93 Difference]: Finished difference Result 212 states and 217 transitions. [2021-05-06 12:09:11,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2021-05-06 12:09:11,260 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 100 states have (on average 1.97) internal successors, (197), 99 states have internal predecessors, (197), 2 states have call successors, (3), 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 201 [2021-05-06 12:09:11,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:11,261 INFO L225 Difference]: With dead ends: 212 [2021-05-06 12:09:11,261 INFO L226 Difference]: Without dead ends: 205 [2021-05-06 12:09:11,262 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 99 SyntacticMatches, 1 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5417 ImplicationChecksByTransitivity, 11614.1ms TimeCoverageRelationStatistics Valid=1071, Invalid=38729, Unknown=0, NotChecked=0, Total=39800 [2021-05-06 12:09:11,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2021-05-06 12:09:11,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2021-05-06 12:09:11,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 200 states have (on average 1.02) internal successors, (204), 200 states have internal predecessors, (204), 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 12:09:11,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 208 transitions. [2021-05-06 12:09:11,274 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 208 transitions. Word has length 201 [2021-05-06 12:09:11,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:11,274 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 208 transitions. [2021-05-06 12:09:11,274 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 101 states, 100 states have (on average 1.97) internal successors, (197), 99 states have internal predecessors, (197), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:09:11,274 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 208 transitions. [2021-05-06 12:09:11,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2021-05-06 12:09:11,275 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:11,275 INFO L523 BasicCegarLoop]: trace histogram [96, 94, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:11,275 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable280 [2021-05-06 12:09:11,275 INFO L428 AbstractCegarLoop]: === Iteration 97 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:11,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:11,275 INFO L82 PathProgramCache]: Analyzing trace with hash 1085752807, now seen corresponding path program 94 times [2021-05-06 12:09:11,275 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:11,276 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [890663248] [2021-05-06 12:09:11,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:11,281 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:09:11,282 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:11,283 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:11,290 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:11,292 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:11,306 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:09:11,318 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:11,326 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size [2021-05-06 12:09:11,330 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:11,334 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:09:11,338 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 69.6 percent of original size 39 [2021-05-06 12:09:11,344 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:11,345 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:11,346 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size [2021-05-06 12:09:11,351 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:11,354 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:09:11,358 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 92.9 percent of original size 39 [2021-05-06 12:09:11,364 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:11,367 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size [2021-05-06 12:09:11,376 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:11,377 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:11,383 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:11,385 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:11,391 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 93.8 percent of original size 60 [2021-05-06 12:09:11,403 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:11,404 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:11,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:11,500 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:11,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:11,503 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 12:09:11,504 WARN L159 QuantifierPusher]: Ignoring assumption.