/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_7.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 11:56:24,999 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 11:56:25,002 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 11:56:25,043 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 11:56:25,101 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 11:56:25,102 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 11:56:25,103 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 11:56:25,107 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 11:56:25,123 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 11:56:25,123 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 11:56:25,126 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 11:56:25,126 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 11:56:25,126 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 11:56:25,127 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 11:56:25,127 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 11:56:25,127 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 11:56:25,127 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 11:56:25,127 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 11:56:25,128 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 11:56:25,128 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 11:56:25,128 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 11:56:25,128 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 11:56:25,129 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 11:56:25,129 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 11:56:25,129 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 11:56:25,129 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 11:56:25,129 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:56:25,129 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 11:56:25,129 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 11:56:25,130 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 11:56:25,130 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 11:56:25,130 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 11:56:25,475 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 11:56:25,494 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 11:56:25,496 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 11:56:25,497 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 11:56:25,498 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 11:56:25,498 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_7.c [2021-05-06 11:56:25,556 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/181222538/1058a3be9406441fa5ebc41b9d6f491b/FLAGdd804ee25 [2021-05-06 11:56:25,942 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 11:56:25,942 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_7.c [2021-05-06 11:56:25,947 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/181222538/1058a3be9406441fa5ebc41b9d6f491b/FLAGdd804ee25 [2021-05-06 11:56:25,959 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/181222538/1058a3be9406441fa5ebc41b9d6f491b [2021-05-06 11:56:25,962 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 11:56:25,963 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 11:56:25,965 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 11:56:25,965 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 11:56:25,968 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 11:56:25,969 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:56:25" (1/1) ... [2021-05-06 11:56:25,970 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6ab0f303 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:56:25, skipping insertion in model container [2021-05-06 11:56:25,970 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:56:25" (1/1) ... [2021-05-06 11:56:25,976 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 11:56:25,986 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 11:56:26,080 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_7.c[318,331] [2021-05-06 11:56:26,088 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:56:26,093 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 11:56:26,101 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_7.c[318,331] [2021-05-06 11:56:26,103 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:56:26,112 INFO L208 MainTranslator]: Completed translation [2021-05-06 11:56:26,113 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:56:26 WrapperNode [2021-05-06 11:56:26,113 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 11:56:26,114 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 11:56:26,114 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 11:56:26,114 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 11:56:26,139 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:56:26" (1/1) ... [2021-05-06 11:56:26,141 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:56:26" (1/1) ... [2021-05-06 11:56:26,146 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:56:26" (1/1) ... [2021-05-06 11:56:26,146 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:56:26" (1/1) ... [2021-05-06 11:56:26,174 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:56:26" (1/1) ... [2021-05-06 11:56:26,179 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:56:26" (1/1) ... [2021-05-06 11:56:26,184 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:56:26" (1/1) ... [2021-05-06 11:56:26,189 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 11:56:26,190 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 11:56:26,190 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 11:56:26,190 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 11:56:26,191 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:56:26" (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 11:56:26,238 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 11:56:26,238 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 11:56:26,238 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 11:56:26,241 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 11:56:26,241 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 11:56:26,241 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 11:56:26,241 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 11:56:26,241 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 11:56:26,241 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 11:56:26,241 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 11:56:26,242 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 11:56:26,242 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 11:56:26,242 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 11:56:26,242 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 11:56:26,242 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 11:56:26,242 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 11:56:26,242 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 11:56:26,444 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 11:56:26,445 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 11:56:26,446 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:56:26 BoogieIcfgContainer [2021-05-06 11:56:26,446 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 11:56:26,447 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 11:56:26,447 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 11:56:26,450 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 11:56:26,450 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 11:56:25" (1/3) ... [2021-05-06 11:56:26,451 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f9fcd25 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:56:26, skipping insertion in model container [2021-05-06 11:56:26,451 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:56:26" (2/3) ... [2021-05-06 11:56:26,451 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2f9fcd25 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:56:26, skipping insertion in model container [2021-05-06 11:56:26,451 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:56:26" (3/3) ... [2021-05-06 11:56:26,452 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_7.c [2021-05-06 11:56:26,456 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 11:56:26,459 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 11:56:26,470 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 11:56:26,484 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 11:56:26,484 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 11:56:26,484 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 11:56:26,484 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 11:56:26,484 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 11:56:26,484 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 11:56:26,485 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 11:56:26,485 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 11:56:26,494 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 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 11:56:26,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 11:56:26,499 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:26,499 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:26,499 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:26,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:26,503 INFO L82 PathProgramCache]: Analyzing trace with hash -1168619535, now seen corresponding path program 1 times [2021-05-06 11:56:26,509 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:26,509 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1033946837] [2021-05-06 11:56:26,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:26,548 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:56:26,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:26,648 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:26,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:26,665 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 11:56:26,666 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:26,666 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1033946837] [2021-05-06 11:56:26,668 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1033946837] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:26,668 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:26,668 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 11:56:26,668 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225248036] [2021-05-06 11:56:26,677 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 11:56:26,678 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:26,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 11:56:26,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:56:26,700 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 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 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:26,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:26,779 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2021-05-06 11:56:26,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 11:56:26,781 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 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 12 [2021-05-06 11:56:26,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:26,785 INFO L225 Difference]: With dead ends: 34 [2021-05-06 11:56:26,785 INFO L226 Difference]: Without dead ends: 14 [2021-05-06 11:56:26,797 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 40.8ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:56:26,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-06 11:56:26,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-06 11:56:26,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 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 11:56:26,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2021-05-06 11:56:26,840 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 12 [2021-05-06 11:56:26,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:26,840 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2021-05-06 11:56:26,840 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:26,840 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2021-05-06 11:56:26,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 11:56:26,841 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:26,841 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:26,841 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 11:56:26,841 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:26,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:26,842 INFO L82 PathProgramCache]: Analyzing trace with hash -1458605129, now seen corresponding path program 1 times [2021-05-06 11:56:26,842 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:26,842 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2018611138] [2021-05-06 11:56:26,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:26,845 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:56:26,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:26,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:26,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:26,916 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 11:56:26,916 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:26,916 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2018611138] [2021-05-06 11:56:26,916 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2018611138] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:26,917 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:26,917 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 11:56:26,917 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894046386] [2021-05-06 11:56:26,918 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 11:56:26,918 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:26,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 11:56:26,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 11:56:26,919 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:26,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:26,968 INFO L93 Difference]: Finished difference Result 24 states and 30 transitions. [2021-05-06 11:56:26,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 11:56:26,969 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 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 12 [2021-05-06 11:56:26,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:26,969 INFO L225 Difference]: With dead ends: 24 [2021-05-06 11:56:26,969 INFO L226 Difference]: Without dead ends: 16 [2021-05-06 11:56:26,970 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 41.3ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:56:26,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-05-06 11:56:26,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-05-06 11:56:26,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 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 11:56:26,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-05-06 11:56:26,975 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 12 [2021-05-06 11:56:26,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:26,976 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-05-06 11:56:26,976 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:26,976 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-05-06 11:56:26,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-06 11:56:26,976 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:26,976 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:26,976 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 11:56:26,977 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:26,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:26,977 INFO L82 PathProgramCache]: Analyzing trace with hash -1316432198, now seen corresponding path program 1 times [2021-05-06 11:56:26,977 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:26,977 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [780922532] [2021-05-06 11:56:26,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:27,011 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:27,014 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:27,027 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:27,041 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:27,051 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:27,053 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:56:27,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:27,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:27,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:27,146 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 11:56:27,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:27,175 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:27,176 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [780922532] [2021-05-06 11:56:27,176 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [780922532] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:27,176 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:27,176 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 11:56:27,176 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305170781] [2021-05-06 11:56:27,177 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 11:56:27,177 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:27,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 11:56:27,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:56:27,178 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:27,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:27,294 INFO L93 Difference]: Finished difference Result 26 states and 32 transitions. [2021-05-06 11:56:27,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 11:56:27,294 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-06 11:56:27,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:27,295 INFO L225 Difference]: With dead ends: 26 [2021-05-06 11:56:27,295 INFO L226 Difference]: Without dead ends: 20 [2021-05-06 11:56:27,296 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 95.6ms TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:56:27,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-06 11:56:27,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-05-06 11:56:27,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:27,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2021-05-06 11:56:27,306 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 14 [2021-05-06 11:56:27,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:27,306 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2021-05-06 11:56:27,306 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:27,306 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2021-05-06 11:56:27,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-06 11:56:27,307 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:27,307 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:27,307 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 11:56:27,307 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:27,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:27,308 INFO L82 PathProgramCache]: Analyzing trace with hash -1342594849, now seen corresponding path program 1 times [2021-05-06 11:56:27,308 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:27,309 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1667573935] [2021-05-06 11:56:27,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:27,344 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:27,349 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:27,364 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:27,386 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:27,393 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:27,432 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:27,447 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:27,456 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:27,457 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:27,464 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:27,478 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:27,486 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:27,488 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:27,494 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:27,504 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:27,509 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:27,517 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:27,524 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:27,535 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:27,537 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:27,541 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:27,554 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:27,557 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:27,582 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:27,597 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:27,599 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:27,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:27,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:27,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:27,653 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 11:56:27,654 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:27,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:27,713 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:27,714 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1667573935] [2021-05-06 11:56:27,714 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1667573935] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:27,714 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:27,714 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:56:27,714 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909808453] [2021-05-06 11:56:27,714 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:56:27,714 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:27,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:56:27,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:56:27,715 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 9 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 11:56:27,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:27,901 INFO L93 Difference]: Finished difference Result 37 states and 48 transitions. [2021-05-06 11:56:27,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:56:27,901 INFO L78 Accepts]: Start accepts. Automaton has has 9 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 11:56:27,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:27,903 INFO L225 Difference]: With dead ends: 37 [2021-05-06 11:56:27,903 INFO L226 Difference]: Without dead ends: 25 [2021-05-06 11:56:27,904 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 182.5ms TimeCoverageRelationStatistics Valid=75, Invalid=135, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:56:27,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-06 11:56:27,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-05-06 11:56:27,909 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 11:56:27,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-05-06 11:56:27,910 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 19 [2021-05-06 11:56:27,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:27,910 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-05-06 11:56:27,910 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 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 11:56:27,911 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-05-06 11:56:27,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-06 11:56:27,911 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:27,911 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:27,911 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-06 11:56:27,911 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:27,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:27,912 INFO L82 PathProgramCache]: Analyzing trace with hash 1246825262, now seen corresponding path program 2 times [2021-05-06 11:56:27,912 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:27,912 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [393788617] [2021-05-06 11:56:27,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:27,926 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:27,942 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:27,948 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:27,963 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:27,965 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:27,984 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:28,024 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:28,029 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:28,036 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:28,040 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:28,045 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:28,052 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:28,053 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:28,056 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:28,056 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:28,060 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:28,069 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:28,076 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:28,082 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:28,083 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:28,085 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:28,094 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:28,096 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:28,116 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:28,130 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:28,131 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:28,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:28,172 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:28,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:28,177 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 11:56:28,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:28,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:28,254 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:28,254 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [393788617] [2021-05-06 11:56:28,254 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [393788617] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:28,254 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:28,255 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 11:56:28,255 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337767032] [2021-05-06 11:56:28,255 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 11:56:28,255 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:28,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 11:56:28,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:56:28,255 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:28,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:28,559 INFO L93 Difference]: Finished difference Result 47 states and 58 transitions. [2021-05-06 11:56:28,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 11:56:28,560 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 states have internal predecessors, (20), 2 states have call successors, (3), 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 24 [2021-05-06 11:56:28,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:28,560 INFO L225 Difference]: With dead ends: 47 [2021-05-06 11:56:28,561 INFO L226 Difference]: Without dead ends: 30 [2021-05-06 11:56:28,561 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 273.9ms TimeCoverageRelationStatistics Valid=135, Invalid=285, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:56:28,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-06 11:56:28,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-06 11:56:28,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.16) internal successors, (29), 25 states have internal predecessors, (29), 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 11:56:28,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2021-05-06 11:56:28,571 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 24 [2021-05-06 11:56:28,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:28,572 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2021-05-06 11:56:28,572 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:28,572 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2021-05-06 11:56:28,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-06 11:56:28,572 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:28,573 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:28,573 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-06 11:56:28,573 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:28,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:28,573 INFO L82 PathProgramCache]: Analyzing trace with hash -319242389, now seen corresponding path program 3 times [2021-05-06 11:56:28,573 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:28,574 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [892243682] [2021-05-06 11:56:28,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:28,585 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:28,606 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:28,609 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:28,621 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:28,624 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:28,635 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:28,651 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:28,656 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:28,664 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:28,669 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:28,674 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:28,681 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:28,684 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:28,688 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:28,689 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:28,693 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:28,705 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:28,712 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:28,720 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:28,721 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:28,724 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:28,734 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:28,737 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:28,761 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:28,775 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:28,777 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:28,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:28,820 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:28,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:28,825 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 11:56:28,826 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:28,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:28,934 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:28,935 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [892243682] [2021-05-06 11:56:28,935 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [892243682] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:28,935 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:28,935 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:56:28,935 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689379554] [2021-05-06 11:56:28,935 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:56:28,935 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:28,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:56:28,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:56:28,936 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 14 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 11:56:29,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:29,351 INFO L93 Difference]: Finished difference Result 57 states and 68 transitions. [2021-05-06 11:56:29,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:56:29,352 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 14 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 11:56:29,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:29,352 INFO L225 Difference]: With dead ends: 57 [2021-05-06 11:56:29,352 INFO L226 Difference]: Without dead ends: 35 [2021-05-06 11:56:29,353 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 390.3ms TimeCoverageRelationStatistics Valid=210, Invalid=492, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:56:29,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-06 11:56:29,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-06 11:56:29,357 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 11:56:29,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2021-05-06 11:56:29,357 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 29 [2021-05-06 11:56:29,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:29,358 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2021-05-06 11:56:29,359 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 14 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 11:56:29,359 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2021-05-06 11:56:29,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 11:56:29,359 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:29,359 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:29,359 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-06 11:56:29,359 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:29,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:29,360 INFO L82 PathProgramCache]: Analyzing trace with hash 951830946, now seen corresponding path program 4 times [2021-05-06 11:56:29,360 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:29,360 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [503883192] [2021-05-06 11:56:29,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:29,392 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:29,411 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:29,415 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:29,424 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:29,426 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:29,437 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:29,449 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:29,455 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:29,456 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:29,459 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:29,467 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:29,474 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:29,474 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:29,479 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:29,485 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:29,489 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:29,495 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:29,501 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:29,506 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:29,520 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:29,522 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:29,532 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:29,533 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:29,541 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:29,554 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:29,555 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:29,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:29,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:29,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:29,621 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 11:56:29,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:29,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:29,749 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:29,750 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [503883192] [2021-05-06 11:56:29,750 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [503883192] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:29,750 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:29,750 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:56:29,750 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235083750] [2021-05-06 11:56:29,750 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:56:29,750 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:29,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:56:29,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=204, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:56:29,751 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand has 18 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 17 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:30,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:30,210 INFO L93 Difference]: Finished difference Result 67 states and 78 transitions. [2021-05-06 11:56:30,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 11:56:30,211 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 17 states have internal predecessors, (30), 2 states have call successors, (3), 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 34 [2021-05-06 11:56:30,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:30,213 INFO L225 Difference]: With dead ends: 67 [2021-05-06 11:56:30,213 INFO L226 Difference]: Without dead ends: 40 [2021-05-06 11:56:30,213 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 434.3ms TimeCoverageRelationStatistics Valid=300, Invalid=756, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:56:30,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-06 11:56:30,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-05-06 11:56:30,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.1142857142857143) internal successors, (39), 35 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:30,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2021-05-06 11:56:30,218 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 34 [2021-05-06 11:56:30,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:30,218 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2021-05-06 11:56:30,218 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 17 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:30,218 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2021-05-06 11:56:30,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-06 11:56:30,219 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:30,219 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:30,219 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-06 11:56:30,219 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:30,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:30,219 INFO L82 PathProgramCache]: Analyzing trace with hash 601551863, now seen corresponding path program 5 times [2021-05-06 11:56:30,220 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:30,220 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1443085181] [2021-05-06 11:56:30,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:30,242 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:30,246 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:30,248 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:30,257 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:30,259 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:30,292 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:30,305 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:30,310 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:30,311 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:30,316 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:30,325 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:30,331 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:30,334 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:30,337 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:30,341 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:30,345 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:30,354 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:30,360 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:30,366 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:30,367 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:30,370 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:30,381 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:30,383 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:30,412 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:30,426 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:30,428 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:30,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:30,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:30,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:30,488 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 11:56:30,489 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:30,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:30,678 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:30,679 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1443085181] [2021-05-06 11:56:30,679 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1443085181] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:30,679 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:30,679 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:56:30,679 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519909095] [2021-05-06 11:56:30,679 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:56:30,679 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:30,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:56:30,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=283, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:56:30,680 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 21 states, 21 states have (on average 1.6666666666666667) internal successors, (35), 20 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 11:56:31,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:31,271 INFO L93 Difference]: Finished difference Result 77 states and 88 transitions. [2021-05-06 11:56:31,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:56:31,272 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.6666666666666667) internal successors, (35), 20 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 11:56:31,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:31,273 INFO L225 Difference]: With dead ends: 77 [2021-05-06 11:56:31,273 INFO L226 Difference]: Without dead ends: 45 [2021-05-06 11:56:31,273 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 354 ImplicationChecksByTransitivity, 611.8ms TimeCoverageRelationStatistics Valid=405, Invalid=1077, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 11:56:31,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-06 11:56:31,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-05-06 11:56:31,278 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 11:56:31,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2021-05-06 11:56:31,278 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 39 [2021-05-06 11:56:31,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:31,279 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2021-05-06 11:56:31,279 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.6666666666666667) internal successors, (35), 20 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 11:56:31,279 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2021-05-06 11:56:31,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-06 11:56:31,279 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:31,279 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:31,279 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-06 11:56:31,280 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:31,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:31,280 INFO L82 PathProgramCache]: Analyzing trace with hash -2144480746, now seen corresponding path program 6 times [2021-05-06 11:56:31,280 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:31,280 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1122991628] [2021-05-06 11:56:31,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:31,286 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:31,287 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:31,288 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:31,295 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:31,296 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:31,312 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:31,322 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:31,325 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:31,330 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:31,333 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:31,337 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:31,342 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:31,343 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:31,345 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:31,345 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:31,348 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:31,355 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:31,361 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:31,364 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:31,377 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:31,378 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:31,388 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:31,390 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:31,397 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:31,408 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:31,409 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:31,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:31,464 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:31,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:31,468 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:31,469 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:31,471 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:31,662 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:31,662 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1122991628] [2021-05-06 11:56:31,662 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1122991628] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:31,662 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:31,662 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:56:31,662 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984176413] [2021-05-06 11:56:31,662 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:56:31,662 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:31,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:56:31,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=375, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:56:31,663 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand has 24 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 23 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:32,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:32,361 INFO L93 Difference]: Finished difference Result 87 states and 98 transitions. [2021-05-06 11:56:32,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 11:56:32,361 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 23 states have internal predecessors, (40), 2 states have call successors, (3), 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 44 [2021-05-06 11:56:32,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:32,362 INFO L225 Difference]: With dead ends: 87 [2021-05-06 11:56:32,362 INFO L226 Difference]: Without dead ends: 50 [2021-05-06 11:56:32,362 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 481 ImplicationChecksByTransitivity, 674.2ms TimeCoverageRelationStatistics Valid=525, Invalid=1455, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 11:56:32,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-06 11:56:32,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-05-06 11:56:32,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.0888888888888888) internal successors, (49), 45 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:32,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 53 transitions. [2021-05-06 11:56:32,368 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 53 transitions. Word has length 44 [2021-05-06 11:56:32,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:32,368 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 53 transitions. [2021-05-06 11:56:32,368 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 23 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:32,368 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 53 transitions. [2021-05-06 11:56:32,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 11:56:32,368 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:32,368 INFO L523 BasicCegarLoop]: trace histogram [15, 14, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:32,369 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-05-06 11:56:32,369 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:32,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:32,369 INFO L82 PathProgramCache]: Analyzing trace with hash 266043011, now seen corresponding path program 7 times [2021-05-06 11:56:32,369 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:32,369 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1163175152] [2021-05-06 11:56:32,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:32,375 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:32,376 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:32,377 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:32,384 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:32,385 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:32,401 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:32,411 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:32,414 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:32,418 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:32,421 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:32,424 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:32,430 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:32,430 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:32,432 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:32,436 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:32,441 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:32,444 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:32,450 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:32,453 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:32,464 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:32,466 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:32,477 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:32,478 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:32,486 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:32,497 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:32,497 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:32,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:32,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:32,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:32,555 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 11:56:32,556 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:32,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:32,789 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:32,789 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1163175152] [2021-05-06 11:56:32,789 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1163175152] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:32,789 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:32,789 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 11:56:32,789 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1920590489] [2021-05-06 11:56:32,790 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 11:56:32,790 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:32,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 11:56:32,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=480, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:56:32,790 INFO L87 Difference]: Start difference. First operand 50 states and 53 transitions. Second operand has 27 states, 27 states have (on average 1.6666666666666667) internal successors, (45), 26 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 11:56:33,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:33,660 INFO L93 Difference]: Finished difference Result 97 states and 108 transitions. [2021-05-06 11:56:33,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 11:56:33,660 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.6666666666666667) internal successors, (45), 26 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 11:56:33,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:33,661 INFO L225 Difference]: With dead ends: 97 [2021-05-06 11:56:33,661 INFO L226 Difference]: Without dead ends: 55 [2021-05-06 11:56:33,662 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 641 ImplicationChecksByTransitivity, 872.7ms TimeCoverageRelationStatistics Valid=660, Invalid=1890, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 11:56:33,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-06 11:56:33,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-06 11:56:33,667 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 11:56:33,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2021-05-06 11:56:33,667 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 49 [2021-05-06 11:56:33,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:33,668 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2021-05-06 11:56:33,668 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 1.6666666666666667) internal successors, (45), 26 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 11:56:33,668 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2021-05-06 11:56:33,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-06 11:56:33,668 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:33,668 INFO L523 BasicCegarLoop]: trace histogram [17, 16, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:33,668 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-05-06 11:56:33,668 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:33,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:33,669 INFO L82 PathProgramCache]: Analyzing trace with hash 2144068746, now seen corresponding path program 8 times [2021-05-06 11:56:33,669 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:33,669 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [359627384] [2021-05-06 11:56:33,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:33,676 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:33,677 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:33,678 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:33,686 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:33,688 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:33,709 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:33,724 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:33,728 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:33,734 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:33,740 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:33,744 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:33,752 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:33,752 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:33,754 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:33,760 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:33,764 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:33,769 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:33,776 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:33,783 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:33,783 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:33,786 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:33,793 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:33,795 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:33,814 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:33,828 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:33,829 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:33,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:33,953 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:33,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:33,956 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 11:56:33,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:34,235 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:34,235 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [359627384] [2021-05-06 11:56:34,236 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [359627384] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:34,236 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:34,236 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 11:56:34,236 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426486366] [2021-05-06 11:56:34,236 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 11:56:34,236 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:34,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 11:56:34,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=735, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:56:34,237 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand has 30 states, 30 states have (on average 1.6666666666666667) internal successors, (50), 29 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:35,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:35,299 INFO L93 Difference]: Finished difference Result 137 states and 148 transitions. [2021-05-06 11:56:35,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 11:56:35,310 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.6666666666666667) internal successors, (50), 29 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 54 [2021-05-06 11:56:35,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:35,312 INFO L225 Difference]: With dead ends: 137 [2021-05-06 11:56:35,312 INFO L226 Difference]: Without dead ends: 90 [2021-05-06 11:56:35,315 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 995 ImplicationChecksByTransitivity, 1030.7ms TimeCoverageRelationStatistics Valid=864, Invalid=2676, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 11:56:35,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-06 11:56:35,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2021-05-06 11:56:35,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 85 states have (on average 1.0588235294117647) internal successors, (90), 85 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 11:56:35,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 94 transitions. [2021-05-06 11:56:35,333 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 94 transitions. Word has length 54 [2021-05-06 11:56:35,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:35,333 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 94 transitions. [2021-05-06 11:56:35,333 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 1.6666666666666667) internal successors, (50), 29 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:35,333 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 94 transitions. [2021-05-06 11:56:35,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-06 11:56:35,333 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:35,334 INFO L523 BasicCegarLoop]: trace histogram [18, 17, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:35,334 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-05-06 11:56:35,334 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:35,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:35,334 INFO L82 PathProgramCache]: Analyzing trace with hash 1792027892, now seen corresponding path program 9 times [2021-05-06 11:56:35,334 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:35,334 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [994969503] [2021-05-06 11:56:35,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:35,344 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:35,345 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:35,347 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:35,354 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:35,356 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:35,373 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:35,385 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:35,405 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:35,411 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:35,415 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:35,419 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:35,427 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:35,428 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:35,430 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:35,430 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:35,435 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:35,444 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:35,452 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:35,456 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:35,471 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:35,473 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:35,482 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:35,484 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:35,492 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:35,513 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:35,515 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:35,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:35,628 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:35,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:35,632 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 11:56:35,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:35,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:35,949 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:35,949 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [994969503] [2021-05-06 11:56:35,949 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [994969503] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:35,949 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:35,949 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 11:56:35,949 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077971258] [2021-05-06 11:56:35,950 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 11:56:35,950 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:35,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 11:56:35,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=678, Unknown=0, NotChecked=0, Total=992 [2021-05-06 11:56:35,950 INFO L87 Difference]: Start difference. First operand 90 states and 94 transitions. Second operand has 32 states, 32 states have (on average 1.65625) internal successors, (53), 31 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 11:56:37,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:37,154 INFO L93 Difference]: Finished difference Result 145 states and 159 transitions. [2021-05-06 11:56:37,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 11:56:37,155 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.65625) internal successors, (53), 31 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 11:56:37,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:37,156 INFO L225 Difference]: With dead ends: 145 [2021-05-06 11:56:37,156 INFO L226 Difference]: Without dead ends: 97 [2021-05-06 11:56:37,157 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 946 ImplicationChecksByTransitivity, 1114.0ms TimeCoverageRelationStatistics Valid=936, Invalid=2724, Unknown=0, NotChecked=0, Total=3660 [2021-05-06 11:56:37,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-05-06 11:56:37,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 63. [2021-05-06 11:56:37,167 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 11:56:37,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2021-05-06 11:56:37,167 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 57 [2021-05-06 11:56:37,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:37,167 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2021-05-06 11:56:37,167 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.65625) internal successors, (53), 31 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 11:56:37,167 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2021-05-06 11:56:37,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-06 11:56:37,168 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:37,168 INFO L523 BasicCegarLoop]: trace histogram [20, 19, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:37,168 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-05-06 11:56:37,168 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:37,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:37,168 INFO L82 PathProgramCache]: Analyzing trace with hash 1417026105, now seen corresponding path program 10 times [2021-05-06 11:56:37,169 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:37,169 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [280207886] [2021-05-06 11:56:37,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:37,192 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:37,205 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:37,207 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:37,214 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:37,215 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:37,229 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:37,241 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:37,248 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:37,248 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:37,254 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:37,261 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:37,269 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:37,269 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:37,271 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:37,272 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:37,277 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:37,286 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:37,292 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:37,313 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:37,314 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:37,316 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:37,322 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:37,323 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:37,345 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:37,357 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:37,358 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:37,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:37,464 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:37,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:37,469 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 11:56:37,470 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:37,471 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:37,851 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:37,852 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [280207886] [2021-05-06 11:56:37,852 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [280207886] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:37,852 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:37,852 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 11:56:37,852 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870122326] [2021-05-06 11:56:37,853 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 11:56:37,853 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:37,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 11:56:37,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=373, Invalid=817, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:56:37,854 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand has 35 states, 35 states have (on average 1.6571428571428573) internal successors, (58), 34 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:39,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:39,201 INFO L93 Difference]: Finished difference Result 123 states and 134 transitions. [2021-05-06 11:56:39,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 11:56:39,202 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.6571428571428573) internal successors, (58), 34 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2021-05-06 11:56:39,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:39,202 INFO L225 Difference]: With dead ends: 123 [2021-05-06 11:56:39,202 INFO L226 Difference]: Without dead ends: 68 [2021-05-06 11:56:39,203 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1166 ImplicationChecksByTransitivity, 1332.5ms TimeCoverageRelationStatistics Valid=1113, Invalid=3309, Unknown=0, NotChecked=0, Total=4422 [2021-05-06 11:56:39,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-06 11:56:39,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-05-06 11:56:39,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 63 states have (on average 1.0634920634920635) internal successors, (67), 63 states have internal predecessors, (67), 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 11:56:39,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 71 transitions. [2021-05-06 11:56:39,210 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 71 transitions. Word has length 62 [2021-05-06 11:56:39,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:39,210 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 71 transitions. [2021-05-06 11:56:39,210 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.6571428571428573) internal successors, (58), 34 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:39,210 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 71 transitions. [2021-05-06 11:56:39,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-06 11:56:39,211 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:39,211 INFO L523 BasicCegarLoop]: trace histogram [22, 21, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:39,211 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-05-06 11:56:39,211 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:39,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:39,211 INFO L82 PathProgramCache]: Analyzing trace with hash 1447479616, now seen corresponding path program 11 times [2021-05-06 11:56:39,211 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:39,211 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1600283653] [2021-05-06 11:56:39,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:39,233 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:39,235 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:39,236 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:39,244 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:39,246 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:39,267 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:39,283 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:39,287 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:39,293 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:39,297 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:39,301 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:39,309 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:39,310 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:39,311 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:39,312 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:39,316 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:39,326 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:39,333 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:39,337 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:39,351 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:39,353 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:39,361 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:39,362 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:39,371 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:39,384 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:39,385 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:39,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:39,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:39,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:39,511 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 11:56:39,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:39,515 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:39,884 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:39,885 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1600283653] [2021-05-06 11:56:39,885 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1600283653] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:39,885 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:39,885 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 11:56:39,885 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385610801] [2021-05-06 11:56:39,885 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 11:56:39,885 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:39,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 11:56:39,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=969, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 11:56:39,886 INFO L87 Difference]: Start difference. First operand 68 states and 71 transitions. Second operand has 38 states, 38 states have (on average 1.6578947368421053) internal successors, (63), 37 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 11:56:41,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:41,341 INFO L93 Difference]: Finished difference Result 133 states and 144 transitions. [2021-05-06 11:56:41,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 11:56:41,342 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.6578947368421053) internal successors, (63), 37 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 11:56:41,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:41,342 INFO L225 Difference]: With dead ends: 133 [2021-05-06 11:56:41,342 INFO L226 Difference]: Without dead ends: 73 [2021-05-06 11:56:41,344 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1387 ImplicationChecksByTransitivity, 1397.2ms TimeCoverageRelationStatistics Valid=1305, Invalid=3951, Unknown=0, NotChecked=0, Total=5256 [2021-05-06 11:56:41,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-06 11:56:41,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2021-05-06 11:56:41,350 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 11:56:41,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2021-05-06 11:56:41,351 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 67 [2021-05-06 11:56:41,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:41,351 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2021-05-06 11:56:41,351 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 1.6578947368421053) internal successors, (63), 37 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 11:56:41,351 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2021-05-06 11:56:41,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-05-06 11:56:41,352 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:41,352 INFO L523 BasicCegarLoop]: trace histogram [24, 23, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:41,352 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-05-06 11:56:41,352 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:41,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:41,352 INFO L82 PathProgramCache]: Analyzing trace with hash 435450605, now seen corresponding path program 12 times [2021-05-06 11:56:41,352 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:41,353 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1572675439] [2021-05-06 11:56:41,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:41,360 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:41,361 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:41,362 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:41,370 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:41,371 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:41,391 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:41,406 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:41,411 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:41,412 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:41,416 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:41,430 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:41,437 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:41,438 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:41,440 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:41,440 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:41,444 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:41,452 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:41,459 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:41,466 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:41,466 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:41,468 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:41,476 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:41,478 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:41,496 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:41,510 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:41,511 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:41,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:41,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:41,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:41,677 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 11:56:41,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:42,079 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:42,080 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1572675439] [2021-05-06 11:56:42,080 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1572675439] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:42,080 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:42,080 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 11:56:42,080 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329718803] [2021-05-06 11:56:42,080 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 11:56:42,080 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:42,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 11:56:42,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=570, Invalid=1322, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 11:56:42,081 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand has 41 states, 41 states have (on average 1.6585365853658536) internal successors, (68), 40 states have internal predecessors, (68), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:43,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:43,738 INFO L93 Difference]: Finished difference Result 187 states and 198 transitions. [2021-05-06 11:56:43,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 11:56:43,738 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.6585365853658536) internal successors, (68), 40 states have internal predecessors, (68), 2 states have call successors, (3), 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 72 [2021-05-06 11:56:43,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:43,739 INFO L225 Difference]: With dead ends: 187 [2021-05-06 11:56:43,739 INFO L226 Difference]: Without dead ends: 122 [2021-05-06 11:56:43,740 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1902 ImplicationChecksByTransitivity, 1620.6ms TimeCoverageRelationStatistics Valid=1581, Invalid=5061, Unknown=0, NotChecked=0, Total=6642 [2021-05-06 11:56:43,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-05-06 11:56:43,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 122. [2021-05-06 11:56:43,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 117 states have (on average 1.0427350427350428) internal successors, (122), 117 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 11:56:43,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 126 transitions. [2021-05-06 11:56:43,748 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 126 transitions. Word has length 72 [2021-05-06 11:56:43,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:43,748 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 126 transitions. [2021-05-06 11:56:43,748 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 1.6585365853658536) internal successors, (68), 40 states have internal predecessors, (68), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:43,748 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 126 transitions. [2021-05-06 11:56:43,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-06 11:56:43,749 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:43,749 INFO L523 BasicCegarLoop]: trace histogram [25, 24, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:43,749 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-05-06 11:56:43,749 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:43,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:43,749 INFO L82 PathProgramCache]: Analyzing trace with hash -1759245775, now seen corresponding path program 13 times [2021-05-06 11:56:43,750 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:43,750 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1155170265] [2021-05-06 11:56:43,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:43,759 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:43,772 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:43,774 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:43,780 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:43,782 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:43,791 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:43,806 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:43,808 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:43,814 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:43,818 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:43,822 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:43,830 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:43,830 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:43,832 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:43,837 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:43,841 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:43,845 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:43,852 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:43,856 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:43,856 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:43,857 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:43,864 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:43,866 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:43,885 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:43,900 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:43,901 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:43,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:44,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:44,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:44,044 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 11:56:44,045 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:44,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:44,490 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:44,490 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1155170265] [2021-05-06 11:56:44,490 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1155170265] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:44,490 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:44,490 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-06 11:56:44,490 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780332191] [2021-05-06 11:56:44,490 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-06 11:56:44,490 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:44,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-06 11:56:44,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=1243, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 11:56:44,491 INFO L87 Difference]: Start difference. First operand 122 states and 126 transitions. Second operand has 43 states, 43 states have (on average 1.6511627906976745) internal successors, (71), 42 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 11:56:46,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:46,286 INFO L93 Difference]: Finished difference Result 195 states and 209 transitions. [2021-05-06 11:56:46,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 11:56:46,286 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.6511627906976745) internal successors, (71), 42 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 11:56:46,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:46,287 INFO L225 Difference]: With dead ends: 195 [2021-05-06 11:56:46,287 INFO L226 Difference]: Without dead ends: 129 [2021-05-06 11:56:46,289 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1832 ImplicationChecksByTransitivity, 1733.4ms TimeCoverageRelationStatistics Valid=1683, Invalid=5123, Unknown=0, NotChecked=0, Total=6806 [2021-05-06 11:56:46,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-05-06 11:56:46,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 81. [2021-05-06 11:56:46,303 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 11:56:46,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2021-05-06 11:56:46,304 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 75 [2021-05-06 11:56:46,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:46,304 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2021-05-06 11:56:46,304 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 1.6511627906976745) internal successors, (71), 42 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 11:56:46,304 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2021-05-06 11:56:46,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-06 11:56:46,305 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:46,306 INFO L523 BasicCegarLoop]: trace histogram [27, 26, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:46,306 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-05-06 11:56:46,306 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:46,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:46,306 INFO L82 PathProgramCache]: Analyzing trace with hash -1712396772, now seen corresponding path program 14 times [2021-05-06 11:56:46,306 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:46,306 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [526266609] [2021-05-06 11:56:46,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:46,314 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:46,315 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:46,316 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:46,321 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:46,323 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:46,338 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:46,348 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:46,351 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:46,351 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:46,354 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:46,363 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:46,367 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:46,368 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:46,385 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:46,385 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:46,389 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:46,396 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:46,401 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:46,404 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:46,414 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:46,415 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:46,420 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:46,422 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:46,427 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:46,436 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:46,437 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:46,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:46,547 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:46,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:46,555 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 11:56:46,556 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:46,567 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:46,939 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:46,939 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [526266609] [2021-05-06 11:56:46,940 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [526266609] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:46,940 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:46,940 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2021-05-06 11:56:46,940 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076914383] [2021-05-06 11:56:46,940 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-06 11:56:46,940 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:46,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-06 11:56:46,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=641, Invalid=1429, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 11:56:46,941 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand has 46 states, 46 states have (on average 1.6521739130434783) internal successors, (76), 45 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:48,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:48,748 INFO L93 Difference]: Finished difference Result 159 states and 170 transitions. [2021-05-06 11:56:48,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-06 11:56:48,749 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.6521739130434783) internal successors, (76), 45 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 80 [2021-05-06 11:56:48,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:48,750 INFO L225 Difference]: With dead ends: 159 [2021-05-06 11:56:48,750 INFO L226 Difference]: Without dead ends: 86 [2021-05-06 11:56:48,751 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2134 ImplicationChecksByTransitivity, 1605.1ms TimeCoverageRelationStatistics Valid=1917, Invalid=5915, Unknown=0, NotChecked=0, Total=7832 [2021-05-06 11:56:48,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-06 11:56:48,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2021-05-06 11:56:48,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 81 states have (on average 1.0493827160493827) internal successors, (85), 81 states have internal predecessors, (85), 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 11:56:48,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 89 transitions. [2021-05-06 11:56:48,764 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 89 transitions. Word has length 80 [2021-05-06 11:56:48,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:48,764 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 89 transitions. [2021-05-06 11:56:48,764 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 1.6521739130434783) internal successors, (76), 45 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:48,764 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 89 transitions. [2021-05-06 11:56:48,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 11:56:48,774 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:48,774 INFO L523 BasicCegarLoop]: trace histogram [29, 28, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:48,774 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-05-06 11:56:48,774 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:48,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:48,774 INFO L82 PathProgramCache]: Analyzing trace with hash 1383819325, now seen corresponding path program 15 times [2021-05-06 11:56:48,774 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:48,774 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [36462481] [2021-05-06 11:56:48,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:48,786 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:48,797 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:48,800 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:48,807 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:48,808 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:48,815 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:48,826 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:48,829 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:48,834 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:48,837 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:48,839 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:48,845 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:48,845 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:48,846 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:48,851 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:48,854 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:48,857 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:48,862 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:48,883 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:48,885 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:48,886 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:48,893 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:48,894 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:48,910 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:48,920 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:48,921 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:48,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:49,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:49,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:49,078 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 11:56:49,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:49,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:49,531 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:49,531 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [36462481] [2021-05-06 11:56:49,532 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [36462481] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:49,532 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:49,532 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2021-05-06 11:56:49,532 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756615178] [2021-05-06 11:56:49,532 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-06 11:56:49,532 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:49,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-06 11:56:49,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=724, Invalid=1628, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 11:56:49,533 INFO L87 Difference]: Start difference. First operand 86 states and 89 transitions. Second operand has 49 states, 49 states have (on average 1.653061224489796) internal successors, (81), 48 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 11:56:51,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:51,363 INFO L93 Difference]: Finished difference Result 169 states and 180 transitions. [2021-05-06 11:56:51,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 11:56:51,364 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.653061224489796) internal successors, (81), 48 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 11:56:51,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:51,364 INFO L225 Difference]: With dead ends: 169 [2021-05-06 11:56:51,364 INFO L226 Difference]: Without dead ends: 91 [2021-05-06 11:56:51,366 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2444 ImplicationChecksByTransitivity, 1671.4ms TimeCoverageRelationStatistics Valid=2166, Invalid=6764, Unknown=0, NotChecked=0, Total=8930 [2021-05-06 11:56:51,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-05-06 11:56:51,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2021-05-06 11:56:51,373 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 11:56:51,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2021-05-06 11:56:51,373 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 85 [2021-05-06 11:56:51,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:51,374 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2021-05-06 11:56:51,374 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 1.653061224489796) internal successors, (81), 48 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 11:56:51,374 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2021-05-06 11:56:51,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-05-06 11:56:51,374 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:51,374 INFO L523 BasicCegarLoop]: trace histogram [31, 30, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:51,374 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2021-05-06 11:56:51,374 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:51,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:51,375 INFO L82 PathProgramCache]: Analyzing trace with hash -1318005488, now seen corresponding path program 16 times [2021-05-06 11:56:51,375 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:51,375 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [3359211] [2021-05-06 11:56:51,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:51,387 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:51,388 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:51,389 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:51,394 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:51,395 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:51,407 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:51,416 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:51,418 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:51,433 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:51,436 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:51,442 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:51,447 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:51,448 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:51,458 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:51,458 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:51,461 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:51,466 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:51,471 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:51,474 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:51,483 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:51,484 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:51,490 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:51,491 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:51,496 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:51,506 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:51,507 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:51,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:51,745 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:51,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:51,750 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 11:56:51,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:52,269 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:52,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [3359211] [2021-05-06 11:56:52,270 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [3359211] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:52,270 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:52,270 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2021-05-06 11:56:52,270 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148857802] [2021-05-06 11:56:52,272 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-06 11:56:52,272 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:52,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-06 11:56:52,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=891, Invalid=2079, Unknown=0, NotChecked=0, Total=2970 [2021-05-06 11:56:52,273 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand has 52 states, 52 states have (on average 1.6538461538461537) internal successors, (86), 51 states have internal predecessors, (86), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:54,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:54,367 INFO L93 Difference]: Finished difference Result 237 states and 248 transitions. [2021-05-06 11:56:54,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-06 11:56:54,368 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.6538461538461537) internal successors, (86), 51 states have internal predecessors, (86), 2 states have call successors, (3), 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 90 [2021-05-06 11:56:54,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:54,368 INFO L225 Difference]: With dead ends: 237 [2021-05-06 11:56:54,368 INFO L226 Difference]: Without dead ends: 154 [2021-05-06 11:56:54,369 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3098 ImplicationChecksByTransitivity, 2036.9ms TimeCoverageRelationStatistics Valid=2514, Invalid=8198, Unknown=0, NotChecked=0, Total=10712 [2021-05-06 11:56:54,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-05-06 11:56:54,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 154. [2021-05-06 11:56:54,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 149 states have (on average 1.0335570469798658) internal successors, (154), 149 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 11:56:54,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 158 transitions. [2021-05-06 11:56:54,387 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 158 transitions. Word has length 90 [2021-05-06 11:56:54,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:54,387 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 158 transitions. [2021-05-06 11:56:54,388 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 1.6538461538461537) internal successors, (86), 51 states have internal predecessors, (86), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:54,388 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 158 transitions. [2021-05-06 11:56:54,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-06 11:56:54,388 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:54,388 INFO L523 BasicCegarLoop]: trace histogram [32, 31, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:54,388 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2021-05-06 11:56:54,388 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:54,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:54,389 INFO L82 PathProgramCache]: Analyzing trace with hash -412271698, now seen corresponding path program 17 times [2021-05-06 11:56:54,389 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:54,389 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1290826492] [2021-05-06 11:56:54,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:54,395 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:54,409 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:54,410 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:54,418 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:54,419 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:54,428 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:54,442 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:54,445 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:54,445 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:54,449 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:54,458 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:54,465 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:54,466 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:54,467 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:54,468 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:54,471 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:54,480 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:54,488 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:54,492 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:54,509 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:54,510 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:54,517 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:54,519 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:54,527 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:54,542 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:54,543 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:54,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:54,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:54,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:54,734 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 11:56:54,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:54,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:55,401 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:55,401 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1290826492] [2021-05-06 11:56:55,401 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1290826492] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:55,401 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:55,401 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2021-05-06 11:56:55,401 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996559059] [2021-05-06 11:56:55,402 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-06 11:56:55,402 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:55,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-06 11:56:55,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=884, Invalid=1978, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 11:56:55,403 INFO L87 Difference]: Start difference. First operand 154 states and 158 transitions. Second operand has 54 states, 54 states have (on average 1.6481481481481481) internal successors, (89), 53 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 11:56:58,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:58,148 INFO L93 Difference]: Finished difference Result 245 states and 259 transitions. [2021-05-06 11:56:58,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-06 11:56:58,149 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.6481481481481481) internal successors, (89), 53 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 11:56:58,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:58,149 INFO L225 Difference]: With dead ends: 245 [2021-05-06 11:56:58,150 INFO L226 Difference]: Without dead ends: 161 [2021-05-06 11:56:58,150 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3007 ImplicationChecksByTransitivity, 2610.0ms TimeCoverageRelationStatistics Valid=2646, Invalid=8274, Unknown=0, NotChecked=0, Total=10920 [2021-05-06 11:56:58,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-05-06 11:56:58,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 99. [2021-05-06 11:56:58,156 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 11:56:58,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2021-05-06 11:56:58,157 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 93 [2021-05-06 11:56:58,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:58,157 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2021-05-06 11:56:58,157 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 1.6481481481481481) internal successors, (89), 53 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 11:56:58,157 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2021-05-06 11:56:58,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-05-06 11:56:58,157 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:58,157 INFO L523 BasicCegarLoop]: trace histogram [34, 33, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:58,158 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2021-05-06 11:56:58,158 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:58,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:58,158 INFO L82 PathProgramCache]: Analyzing trace with hash -412121665, now seen corresponding path program 18 times [2021-05-06 11:56:58,158 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:58,158 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [948669831] [2021-05-06 11:56:58,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:58,165 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:58,180 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:58,182 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:58,189 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:58,191 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:58,200 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:58,215 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:58,218 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:58,225 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:58,229 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:58,233 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:58,240 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:58,241 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:58,243 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:58,243 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:58,247 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:58,256 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:58,273 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:58,277 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:58,290 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:58,291 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:58,298 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:58,300 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:58,308 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:58,323 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:58,324 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:58,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:58,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:58,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:58,541 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 11:56:58,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:58,543 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:59,319 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:59,319 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [948669831] [2021-05-06 11:56:59,319 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [948669831] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:59,319 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:59,319 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2021-05-06 11:56:59,319 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458281446] [2021-05-06 11:56:59,320 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-06 11:56:59,320 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:59,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-06 11:56:59,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=981, Invalid=2211, Unknown=0, NotChecked=0, Total=3192 [2021-05-06 11:56:59,320 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand has 57 states, 57 states have (on average 1.6491228070175439) internal successors, (94), 56 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:02,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:02,233 INFO L93 Difference]: Finished difference Result 195 states and 206 transitions. [2021-05-06 11:57:02,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-06 11:57:02,234 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.6491228070175439) internal successors, (94), 56 states have internal predecessors, (94), 2 states have call successors, (3), 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 98 [2021-05-06 11:57:02,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:02,234 INFO L225 Difference]: With dead ends: 195 [2021-05-06 11:57:02,234 INFO L226 Difference]: Without dead ends: 104 [2021-05-06 11:57:02,235 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3391 ImplicationChecksByTransitivity, 2831.3ms TimeCoverageRelationStatistics Valid=2937, Invalid=9273, Unknown=0, NotChecked=0, Total=12210 [2021-05-06 11:57:02,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-05-06 11:57:02,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2021-05-06 11:57:02,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 99 states have (on average 1.0404040404040404) internal successors, (103), 99 states have internal predecessors, (103), 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 11:57:02,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 107 transitions. [2021-05-06 11:57:02,241 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 107 transitions. Word has length 98 [2021-05-06 11:57:02,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:02,241 INFO L480 AbstractCegarLoop]: Abstraction has 104 states and 107 transitions. [2021-05-06 11:57:02,241 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 1.6491228070175439) internal successors, (94), 56 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:02,241 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 107 transitions. [2021-05-06 11:57:02,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-05-06 11:57:02,242 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:02,242 INFO L523 BasicCegarLoop]: trace histogram [36, 35, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:02,242 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2021-05-06 11:57:02,242 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:02,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:02,242 INFO L82 PathProgramCache]: Analyzing trace with hash 619973498, now seen corresponding path program 19 times [2021-05-06 11:57:02,242 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:02,242 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [665844963] [2021-05-06 11:57:02,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:02,248 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:02,261 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:02,263 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:02,270 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:02,272 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:02,281 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:02,295 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:02,298 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:02,304 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:02,307 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:02,312 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:02,319 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:02,320 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:02,322 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:02,328 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:02,331 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:02,336 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:02,343 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:02,346 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:02,347 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:02,348 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:02,355 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:02,356 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:02,375 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:02,389 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:02,390 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:02,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:02,615 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:02,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:02,618 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 11:57:02,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:02,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:03,388 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:03,388 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [665844963] [2021-05-06 11:57:03,388 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [665844963] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:03,388 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:03,388 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [60] imperfect sequences [] total 60 [2021-05-06 11:57:03,388 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989199385] [2021-05-06 11:57:03,389 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-06 11:57:03,389 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:03,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-06 11:57:03,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1083, Invalid=2457, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 11:57:03,389 INFO L87 Difference]: Start difference. First operand 104 states and 107 transitions. Second operand has 60 states, 60 states have (on average 1.65) internal successors, (99), 59 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 11:57:06,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:06,477 INFO L93 Difference]: Finished difference Result 205 states and 216 transitions. [2021-05-06 11:57:06,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-05-06 11:57:06,478 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 1.65) internal successors, (99), 59 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 11:57:06,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:06,479 INFO L225 Difference]: With dead ends: 205 [2021-05-06 11:57:06,479 INFO L226 Difference]: Without dead ends: 109 [2021-05-06 11:57:06,480 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3760 ImplicationChecksByTransitivity, 2934.5ms TimeCoverageRelationStatistics Valid=3243, Invalid=10329, Unknown=0, NotChecked=0, Total=13572 [2021-05-06 11:57:06,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-06 11:57:06,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2021-05-06 11:57:06,486 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 11:57:06,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 112 transitions. [2021-05-06 11:57:06,486 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 112 transitions. Word has length 103 [2021-05-06 11:57:06,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:06,486 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 112 transitions. [2021-05-06 11:57:06,486 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 60 states have (on average 1.65) internal successors, (99), 59 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 11:57:06,486 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 112 transitions. [2021-05-06 11:57:06,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-05-06 11:57:06,487 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:06,487 INFO L523 BasicCegarLoop]: trace histogram [38, 37, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:06,487 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2021-05-06 11:57:06,487 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:06,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:06,487 INFO L82 PathProgramCache]: Analyzing trace with hash -642491661, now seen corresponding path program 20 times [2021-05-06 11:57:06,487 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:06,487 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1472551489] [2021-05-06 11:57:06,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:06,513 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:06,539 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:06,541 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:06,549 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:06,550 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:06,559 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:06,574 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:06,577 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:06,577 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:06,581 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:06,591 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:06,599 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:06,599 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:06,603 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:06,603 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:06,606 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:06,622 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:06,629 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:06,653 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:06,667 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:06,672 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:06,680 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:06,682 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:06,692 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:06,711 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:06,733 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:06,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:07,021 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:07,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:07,052 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 11:57:07,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:07,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:07,984 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:07,985 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1472551489] [2021-05-06 11:57:07,985 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1472551489] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:07,985 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:07,985 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [63] imperfect sequences [] total 63 [2021-05-06 11:57:07,985 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [862242241] [2021-05-06 11:57:07,985 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-06 11:57:07,985 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:07,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-06 11:57:07,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1190, Invalid=2716, Unknown=0, NotChecked=0, Total=3906 [2021-05-06 11:57:07,986 INFO L87 Difference]: Start difference. First operand 109 states and 112 transitions. Second operand has 63 states, 63 states have (on average 1.6507936507936507) internal successors, (104), 62 states have internal predecessors, (104), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:11,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:11,591 INFO L93 Difference]: Finished difference Result 215 states and 226 transitions. [2021-05-06 11:57:11,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-06 11:57:11,592 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 1.6507936507936507) internal successors, (104), 62 states have internal predecessors, (104), 2 states have call successors, (3), 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 108 [2021-05-06 11:57:11,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:11,593 INFO L225 Difference]: With dead ends: 215 [2021-05-06 11:57:11,593 INFO L226 Difference]: Without dead ends: 114 [2021-05-06 11:57:11,594 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4168 ImplicationChecksByTransitivity, 3459.9ms TimeCoverageRelationStatistics Valid=3564, Invalid=11442, Unknown=0, NotChecked=0, Total=15006 [2021-05-06 11:57:11,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-05-06 11:57:11,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 114. [2021-05-06 11:57:11,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 109 states have (on average 1.036697247706422) internal successors, (113), 109 states have internal predecessors, (113), 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 11:57:11,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 117 transitions. [2021-05-06 11:57:11,600 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 117 transitions. Word has length 108 [2021-05-06 11:57:11,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:11,600 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 117 transitions. [2021-05-06 11:57:11,600 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 63 states, 63 states have (on average 1.6507936507936507) internal successors, (104), 62 states have internal predecessors, (104), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:11,600 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 117 transitions. [2021-05-06 11:57:11,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-06 11:57:11,601 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:11,601 INFO L523 BasicCegarLoop]: trace histogram [40, 39, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:11,601 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2021-05-06 11:57:11,601 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:11,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:11,601 INFO L82 PathProgramCache]: Analyzing trace with hash 1377263942, now seen corresponding path program 21 times [2021-05-06 11:57:11,601 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:11,601 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1901209077] [2021-05-06 11:57:11,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:11,607 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:11,621 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:11,623 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:11,631 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:11,633 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:11,642 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:11,656 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:11,659 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:11,659 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:11,663 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:11,673 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:11,680 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:11,681 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:11,683 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:11,689 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:11,692 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:11,696 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:11,703 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:11,706 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:11,707 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:11,708 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:11,716 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:11,717 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:11,736 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:11,751 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:11,752 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:11,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:12,002 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:12,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:12,004 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 11:57:12,005 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:12,006 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:12,915 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:12,915 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1901209077] [2021-05-06 11:57:12,916 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1901209077] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:12,916 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:12,916 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [66] imperfect sequences [] total 66 [2021-05-06 11:57:12,916 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210000229] [2021-05-06 11:57:12,916 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-06 11:57:12,916 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:12,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-06 11:57:12,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1302, Invalid=2988, Unknown=0, NotChecked=0, Total=4290 [2021-05-06 11:57:12,917 INFO L87 Difference]: Start difference. First operand 114 states and 117 transitions. Second operand has 66 states, 66 states have (on average 1.6515151515151516) internal successors, (109), 65 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 11:57:16,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:16,618 INFO L93 Difference]: Finished difference Result 225 states and 236 transitions. [2021-05-06 11:57:16,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-05-06 11:57:16,619 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 1.6515151515151516) internal successors, (109), 65 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 11:57:16,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:16,619 INFO L225 Difference]: With dead ends: 225 [2021-05-06 11:57:16,619 INFO L226 Difference]: Without dead ends: 119 [2021-05-06 11:57:16,620 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4618 ImplicationChecksByTransitivity, 3502.5ms TimeCoverageRelationStatistics Valid=3900, Invalid=12612, Unknown=0, NotChecked=0, Total=16512 [2021-05-06 11:57:16,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-05-06 11:57:16,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2021-05-06 11:57:16,627 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 11:57:16,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 122 transitions. [2021-05-06 11:57:16,627 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 122 transitions. Word has length 113 [2021-05-06 11:57:16,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:16,628 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 122 transitions. [2021-05-06 11:57:16,628 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 66 states, 66 states have (on average 1.6515151515151516) internal successors, (109), 65 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 11:57:16,628 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 122 transitions. [2021-05-06 11:57:16,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-05-06 11:57:16,628 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:16,628 INFO L523 BasicCegarLoop]: trace histogram [42, 41, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:16,628 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2021-05-06 11:57:16,628 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:16,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:16,629 INFO L82 PathProgramCache]: Analyzing trace with hash -865269209, now seen corresponding path program 22 times [2021-05-06 11:57:16,629 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:16,629 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1295473889] [2021-05-06 11:57:16,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:16,635 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:16,650 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:16,651 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:16,659 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:16,661 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:16,669 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:16,684 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:16,687 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:16,687 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:16,691 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:16,700 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:16,708 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:16,708 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:16,718 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:16,718 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:16,722 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:16,730 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:16,737 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:16,740 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:16,741 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:16,742 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:16,750 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:16,751 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:16,770 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:16,784 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:16,784 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:16,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:17,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:17,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:17,046 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 11:57:17,047 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:17,048 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:18,034 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:18,035 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1295473889] [2021-05-06 11:57:18,035 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1295473889] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:18,035 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:18,035 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [69] imperfect sequences [] total 69 [2021-05-06 11:57:18,035 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1175456291] [2021-05-06 11:57:18,035 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2021-05-06 11:57:18,035 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:18,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-05-06 11:57:18,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1419, Invalid=3273, Unknown=0, NotChecked=0, Total=4692 [2021-05-06 11:57:18,036 INFO L87 Difference]: Start difference. First operand 119 states and 122 transitions. Second operand has 69 states, 69 states have (on average 1.6521739130434783) internal successors, (114), 68 states have internal predecessors, (114), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:21,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:21,908 INFO L93 Difference]: Finished difference Result 235 states and 246 transitions. [2021-05-06 11:57:21,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-05-06 11:57:21,908 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 1.6521739130434783) internal successors, (114), 68 states have internal predecessors, (114), 2 states have call successors, (3), 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 118 [2021-05-06 11:57:21,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:21,909 INFO L225 Difference]: With dead ends: 235 [2021-05-06 11:57:21,909 INFO L226 Difference]: Without dead ends: 124 [2021-05-06 11:57:21,910 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5047 ImplicationChecksByTransitivity, 3648.8ms TimeCoverageRelationStatistics Valid=4251, Invalid=13839, Unknown=0, NotChecked=0, Total=18090 [2021-05-06 11:57:21,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-05-06 11:57:21,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2021-05-06 11:57:21,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 119 states have (on average 1.0336134453781514) internal successors, (123), 119 states have internal predecessors, (123), 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 11:57:21,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 127 transitions. [2021-05-06 11:57:21,917 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 127 transitions. Word has length 118 [2021-05-06 11:57:21,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:21,917 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 127 transitions. [2021-05-06 11:57:21,917 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 69 states, 69 states have (on average 1.6521739130434783) internal successors, (114), 68 states have internal predecessors, (114), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:21,917 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 127 transitions. [2021-05-06 11:57:21,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-05-06 11:57:21,917 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:21,917 INFO L523 BasicCegarLoop]: trace histogram [44, 43, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:21,917 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68 [2021-05-06 11:57:21,917 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:21,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:21,918 INFO L82 PathProgramCache]: Analyzing trace with hash -1887011566, now seen corresponding path program 23 times [2021-05-06 11:57:21,918 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:21,918 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [814586501] [2021-05-06 11:57:21,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:21,944 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:21,959 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:21,965 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:21,974 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:21,976 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:21,985 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:21,999 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:22,002 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:22,002 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:22,006 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:22,016 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:22,023 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:22,024 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:22,026 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:22,031 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:22,035 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:22,039 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:22,047 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:22,050 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:22,066 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:22,068 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:22,075 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:22,077 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:22,085 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:22,100 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:22,101 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:22,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:22,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:22,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:22,386 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 11:57:22,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:22,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:23,161 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:23,162 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [814586501] [2021-05-06 11:57:23,162 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [814586501] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:23,162 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:23,162 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [72] imperfect sequences [] total 72 [2021-05-06 11:57:23,162 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435305556] [2021-05-06 11:57:23,162 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2021-05-06 11:57:23,162 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:23,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-05-06 11:57:23,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1541, Invalid=3571, Unknown=0, NotChecked=0, Total=5112 [2021-05-06 11:57:23,164 INFO L87 Difference]: Start difference. First operand 124 states and 127 transitions. Second operand has 72 states, 72 states have (on average 1.6527777777777777) internal successors, (119), 71 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 11:57:26,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:26,256 INFO L93 Difference]: Finished difference Result 245 states and 256 transitions. [2021-05-06 11:57:26,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-05-06 11:57:26,281 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 1.6527777777777777) internal successors, (119), 71 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 11:57:26,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:26,281 INFO L225 Difference]: With dead ends: 245 [2021-05-06 11:57:26,281 INFO L226 Difference]: Without dead ends: 129 [2021-05-06 11:57:26,282 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5541 ImplicationChecksByTransitivity, 2989.6ms TimeCoverageRelationStatistics Valid=4617, Invalid=15123, Unknown=0, NotChecked=0, Total=19740 [2021-05-06 11:57:26,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-05-06 11:57:26,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2021-05-06 11:57:26,289 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 11:57:26,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 132 transitions. [2021-05-06 11:57:26,290 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 132 transitions. Word has length 123 [2021-05-06 11:57:26,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:26,290 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 132 transitions. [2021-05-06 11:57:26,290 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 72 states, 72 states have (on average 1.6527777777777777) internal successors, (119), 71 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 11:57:26,290 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 132 transitions. [2021-05-06 11:57:26,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-05-06 11:57:26,290 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:26,290 INFO L523 BasicCegarLoop]: trace histogram [46, 45, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:26,290 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71 [2021-05-06 11:57:26,290 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:26,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:26,291 INFO L82 PathProgramCache]: Analyzing trace with hash 1372214107, now seen corresponding path program 24 times [2021-05-06 11:57:26,291 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:26,291 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1935699043] [2021-05-06 11:57:26,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:26,297 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:26,297 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:26,298 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:26,306 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:26,307 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:26,322 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:26,333 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:26,335 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:26,340 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:26,343 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:26,347 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:26,353 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:26,354 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:26,355 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:26,360 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:26,363 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:26,367 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:26,381 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:26,385 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:26,400 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:26,402 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:26,408 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:26,409 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:26,416 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:26,427 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:26,428 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:26,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:26,648 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:26,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:26,675 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 11:57:26,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:26,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:27,496 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:27,496 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1935699043] [2021-05-06 11:57:27,496 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1935699043] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:27,496 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:27,496 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [75] imperfect sequences [] total 75 [2021-05-06 11:57:27,497 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051647454] [2021-05-06 11:57:27,497 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2021-05-06 11:57:27,497 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:27,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-05-06 11:57:27,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1668, Invalid=3882, Unknown=0, NotChecked=0, Total=5550 [2021-05-06 11:57:27,498 INFO L87 Difference]: Start difference. First operand 129 states and 132 transitions. Second operand has 75 states, 75 states have (on average 1.6533333333333333) internal successors, (124), 74 states have internal predecessors, (124), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:31,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:31,883 INFO L93 Difference]: Finished difference Result 255 states and 266 transitions. [2021-05-06 11:57:31,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-05-06 11:57:31,883 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 1.6533333333333333) internal successors, (124), 74 states have internal predecessors, (124), 2 states have call successors, (3), 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 128 [2021-05-06 11:57:31,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:31,884 INFO L225 Difference]: With dead ends: 255 [2021-05-06 11:57:31,884 INFO L226 Difference]: Without dead ends: 134 [2021-05-06 11:57:31,885 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6034 ImplicationChecksByTransitivity, 3777.1ms TimeCoverageRelationStatistics Valid=4998, Invalid=16464, Unknown=0, NotChecked=0, Total=21462 [2021-05-06 11:57:31,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-06 11:57:31,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 134. [2021-05-06 11:57:31,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 129 states have (on average 1.0310077519379846) internal successors, (133), 129 states have internal predecessors, (133), 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 11:57:31,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 137 transitions. [2021-05-06 11:57:31,892 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 137 transitions. Word has length 128 [2021-05-06 11:57:31,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:31,892 INFO L480 AbstractCegarLoop]: Abstraction has 134 states and 137 transitions. [2021-05-06 11:57:31,892 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 75 states, 75 states have (on average 1.6533333333333333) internal successors, (124), 74 states have internal predecessors, (124), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:31,892 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 137 transitions. [2021-05-06 11:57:31,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-05-06 11:57:31,892 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:31,892 INFO L523 BasicCegarLoop]: trace histogram [48, 47, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:31,892 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74 [2021-05-06 11:57:31,893 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:31,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:31,893 INFO L82 PathProgramCache]: Analyzing trace with hash 1328586462, now seen corresponding path program 25 times [2021-05-06 11:57:31,893 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:31,893 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1605199343] [2021-05-06 11:57:31,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:31,899 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:31,913 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:31,914 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:31,922 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:31,924 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:31,933 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:31,947 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:31,949 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:31,950 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:31,954 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:31,963 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:31,971 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:31,971 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:31,973 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:31,973 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:31,977 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:31,986 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:31,994 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:31,997 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:31,997 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:31,998 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:32,005 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:32,007 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:32,025 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:32,040 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:32,041 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:32,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:32,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:32,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:32,355 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 11:57:32,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:32,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:33,588 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:33,588 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1605199343] [2021-05-06 11:57:33,588 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1605199343] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:33,588 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:33,588 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [78] imperfect sequences [] total 78 [2021-05-06 11:57:33,588 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1399301354] [2021-05-06 11:57:33,588 INFO L460 AbstractCegarLoop]: Interpolant automaton has 78 states [2021-05-06 11:57:33,588 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:33,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-05-06 11:57:33,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1800, Invalid=4206, Unknown=0, NotChecked=0, Total=6006 [2021-05-06 11:57:33,589 INFO L87 Difference]: Start difference. First operand 134 states and 137 transitions. Second operand has 78 states, 78 states have (on average 1.6538461538461537) internal successors, (129), 77 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 11:57:38,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:38,942 INFO L93 Difference]: Finished difference Result 265 states and 276 transitions. [2021-05-06 11:57:38,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-05-06 11:57:38,942 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 78 states have (on average 1.6538461538461537) internal successors, (129), 77 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 11:57:38,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:38,943 INFO L225 Difference]: With dead ends: 265 [2021-05-06 11:57:38,943 INFO L226 Difference]: Without dead ends: 139 [2021-05-06 11:57:38,944 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6523 ImplicationChecksByTransitivity, 4869.2ms TimeCoverageRelationStatistics Valid=5394, Invalid=17862, Unknown=0, NotChecked=0, Total=23256 [2021-05-06 11:57:38,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-05-06 11:57:38,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2021-05-06 11:57:38,951 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 11:57:38,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 142 transitions. [2021-05-06 11:57:38,951 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 142 transitions. Word has length 133 [2021-05-06 11:57:38,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:38,951 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 142 transitions. [2021-05-06 11:57:38,951 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 78 states, 78 states have (on average 1.6538461538461537) internal successors, (129), 77 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 11:57:38,951 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 142 transitions. [2021-05-06 11:57:38,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-05-06 11:57:38,952 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:38,952 INFO L523 BasicCegarLoop]: trace histogram [50, 49, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:38,952 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77 [2021-05-06 11:57:38,952 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:38,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:38,952 INFO L82 PathProgramCache]: Analyzing trace with hash -54724977, now seen corresponding path program 26 times [2021-05-06 11:57:38,952 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:38,952 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1649955227] [2021-05-06 11:57:38,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:38,960 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:38,960 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 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 11:57:38,972 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:38,974 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:38,996 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:39,012 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:39,015 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:39,015 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:39,019 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:39,028 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:39,036 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:39,036 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:39,038 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:39,044 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:39,047 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:39,051 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:39,059 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:39,063 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:39,076 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:39,078 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:39,085 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:39,087 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:39,095 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:39,110 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:39,111 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:39,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:39,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:39,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:39,490 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 11:57:39,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:39,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:41,000 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:41,000 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1649955227] [2021-05-06 11:57:41,000 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1649955227] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:41,001 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:41,001 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [81] imperfect sequences [] total 81 [2021-05-06 11:57:41,001 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [368149072] [2021-05-06 11:57:41,001 INFO L460 AbstractCegarLoop]: Interpolant automaton has 81 states [2021-05-06 11:57:41,001 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:41,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2021-05-06 11:57:41,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1937, Invalid=4543, Unknown=0, NotChecked=0, Total=6480 [2021-05-06 11:57:41,002 INFO L87 Difference]: Start difference. First operand 139 states and 142 transitions. Second operand has 81 states, 81 states have (on average 1.654320987654321) internal successors, (134), 80 states have internal predecessors, (134), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:46,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:46,506 INFO L93 Difference]: Finished difference Result 275 states and 286 transitions. [2021-05-06 11:57:46,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-05-06 11:57:46,507 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 81 states have (on average 1.654320987654321) internal successors, (134), 80 states have internal predecessors, (134), 2 states have call successors, (3), 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 138 [2021-05-06 11:57:46,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:46,508 INFO L225 Difference]: With dead ends: 275 [2021-05-06 11:57:46,508 INFO L226 Difference]: Without dead ends: 144 [2021-05-06 11:57:46,509 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7083 ImplicationChecksByTransitivity, 5237.6ms TimeCoverageRelationStatistics Valid=5805, Invalid=19317, Unknown=0, NotChecked=0, Total=25122 [2021-05-06 11:57:46,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-05-06 11:57:46,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 144. [2021-05-06 11:57:46,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 139 states have (on average 1.0287769784172662) internal successors, (143), 139 states have internal predecessors, (143), 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 11:57:46,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 147 transitions. [2021-05-06 11:57:46,516 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 147 transitions. Word has length 138 [2021-05-06 11:57:46,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:46,517 INFO L480 AbstractCegarLoop]: Abstraction has 144 states and 147 transitions. [2021-05-06 11:57:46,517 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 81 states, 81 states have (on average 1.654320987654321) internal successors, (134), 80 states have internal predecessors, (134), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:46,517 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 147 transitions. [2021-05-06 11:57:46,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-05-06 11:57:46,517 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:46,517 INFO L523 BasicCegarLoop]: trace histogram [52, 51, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:46,517 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80 [2021-05-06 11:57:46,517 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:46,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:46,518 INFO L82 PathProgramCache]: Analyzing trace with hash 809830058, now seen corresponding path program 27 times [2021-05-06 11:57:46,518 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:46,518 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2093046234] [2021-05-06 11:57:46,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:46,525 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:46,539 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:46,540 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:46,547 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:46,549 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:46,558 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:46,572 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:46,575 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:46,575 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:46,579 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:46,589 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:46,596 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:46,597 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:46,599 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:46,605 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:46,608 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:46,612 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:46,619 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:46,623 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:46,636 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:46,637 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:46,644 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:46,646 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:46,654 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:46,668 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:46,669 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:46,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:47,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:47,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:47,014 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 11:57:47,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:47,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:48,430 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:48,430 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2093046234] [2021-05-06 11:57:48,430 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2093046234] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:48,430 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:48,430 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [84] imperfect sequences [] total 84 [2021-05-06 11:57:48,430 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088208008] [2021-05-06 11:57:48,430 INFO L460 AbstractCegarLoop]: Interpolant automaton has 84 states [2021-05-06 11:57:48,430 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:48,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-05-06 11:57:48,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2079, Invalid=4893, Unknown=0, NotChecked=0, Total=6972 [2021-05-06 11:57:48,431 INFO L87 Difference]: Start difference. First operand 144 states and 147 transitions. Second operand has 84 states, 84 states have (on average 1.6547619047619047) internal successors, (139), 83 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 11:57:54,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:54,271 INFO L93 Difference]: Finished difference Result 285 states and 296 transitions. [2021-05-06 11:57:54,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2021-05-06 11:57:54,272 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 1.6547619047619047) internal successors, (139), 83 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 11:57:54,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:54,272 INFO L225 Difference]: With dead ends: 285 [2021-05-06 11:57:54,272 INFO L226 Difference]: Without dead ends: 149 [2021-05-06 11:57:54,273 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7612 ImplicationChecksByTransitivity, 5353.8ms TimeCoverageRelationStatistics Valid=6231, Invalid=20829, Unknown=0, NotChecked=0, Total=27060 [2021-05-06 11:57:54,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-06 11:57:54,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2021-05-06 11:57:54,280 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 11:57:54,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 152 transitions. [2021-05-06 11:57:54,281 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 152 transitions. Word has length 143 [2021-05-06 11:57:54,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:54,281 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 152 transitions. [2021-05-06 11:57:54,281 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 84 states, 84 states have (on average 1.6547619047619047) internal successors, (139), 83 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 11:57:54,281 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 152 transitions. [2021-05-06 11:57:54,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-05-06 11:57:54,282 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:54,282 INFO L523 BasicCegarLoop]: trace histogram [54, 53, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:54,282 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83 [2021-05-06 11:57:54,282 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:54,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:54,282 INFO L82 PathProgramCache]: Analyzing trace with hash -2064272445, now seen corresponding path program 28 times [2021-05-06 11:57:54,282 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:54,282 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [824941021] [2021-05-06 11:57:54,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:54,289 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:54,304 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:54,306 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:54,314 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:54,316 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:54,326 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:54,343 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:54,346 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:54,353 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:54,358 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:54,362 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:54,371 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:54,372 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:54,374 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:54,380 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:54,384 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:54,388 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:54,395 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:54,398 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:54,411 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:54,413 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:54,419 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:54,421 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:54,429 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:54,443 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:54,444 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:54,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:54,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:54,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:54,812 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 11:57:54,813 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:54,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:56,337 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:56,337 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [824941021] [2021-05-06 11:57:56,337 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [824941021] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:56,337 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:56,337 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [87] imperfect sequences [] total 87 [2021-05-06 11:57:56,337 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329704144] [2021-05-06 11:57:56,337 INFO L460 AbstractCegarLoop]: Interpolant automaton has 87 states [2021-05-06 11:57:56,337 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:56,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-05-06 11:57:56,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2226, Invalid=5256, Unknown=0, NotChecked=0, Total=7482 [2021-05-06 11:57:56,338 INFO L87 Difference]: Start difference. First operand 149 states and 152 transitions. Second operand has 87 states, 87 states have (on average 1.6551724137931034) internal successors, (144), 86 states have internal predecessors, (144), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:02,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:02,306 INFO L93 Difference]: Finished difference Result 295 states and 306 transitions. [2021-05-06 11:58:02,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-05-06 11:58:02,306 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 1.6551724137931034) internal successors, (144), 86 states have internal predecessors, (144), 2 states have call successors, (3), 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 148 [2021-05-06 11:58:02,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:02,306 INFO L225 Difference]: With dead ends: 295 [2021-05-06 11:58:02,307 INFO L226 Difference]: Without dead ends: 154 [2021-05-06 11:58:02,308 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8216 ImplicationChecksByTransitivity, 5400.3ms TimeCoverageRelationStatistics Valid=6672, Invalid=22398, Unknown=0, NotChecked=0, Total=29070 [2021-05-06 11:58:02,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-05-06 11:58:02,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 154. [2021-05-06 11:58:02,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 149 states have (on average 1.0268456375838926) internal successors, (153), 149 states have internal predecessors, (153), 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 11:58:02,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 157 transitions. [2021-05-06 11:58:02,315 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 157 transitions. Word has length 148 [2021-05-06 11:58:02,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:02,316 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 157 transitions. [2021-05-06 11:58:02,316 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 87 states, 87 states have (on average 1.6551724137931034) internal successors, (144), 86 states have internal predecessors, (144), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:02,316 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 157 transitions. [2021-05-06 11:58:02,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2021-05-06 11:58:02,316 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:02,316 INFO L523 BasicCegarLoop]: trace histogram [56, 55, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:02,317 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86 [2021-05-06 11:58:02,317 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:02,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:02,317 INFO L82 PathProgramCache]: Analyzing trace with hash -617417610, now seen corresponding path program 29 times [2021-05-06 11:58:02,317 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:02,317 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [957626038] [2021-05-06 11:58:02,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:02,341 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:02,341 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:02,342 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:02,349 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:02,350 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:02,364 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:02,375 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:02,377 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:02,378 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:02,380 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:02,387 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:02,393 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:02,393 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:02,395 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:02,395 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:02,398 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:02,405 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:02,410 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:02,413 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:02,423 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:02,425 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:02,431 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:02,432 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:02,438 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:02,460 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:02,461 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:02,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:02,899 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:02,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:02,903 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 11:58:02,904 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:04,344 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:04,344 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [957626038] [2021-05-06 11:58:04,344 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [957626038] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:04,344 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:04,344 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [90] imperfect sequences [] total 90 [2021-05-06 11:58:04,344 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [199453614] [2021-05-06 11:58:04,345 INFO L460 AbstractCegarLoop]: Interpolant automaton has 90 states [2021-05-06 11:58:04,345 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:04,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2021-05-06 11:58:04,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2508, Invalid=6048, Unknown=0, NotChecked=0, Total=8556 [2021-05-06 11:58:04,346 INFO L87 Difference]: Start difference. First operand 154 states and 157 transitions. Second operand has 90 states, 90 states have (on average 1.6555555555555554) internal successors, (149), 89 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 11:58:11,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:11,302 INFO L93 Difference]: Finished difference Result 413 states and 424 transitions. [2021-05-06 11:58:11,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-05-06 11:58:11,303 INFO L78 Accepts]: Start accepts. Automaton has has 90 states, 90 states have (on average 1.6555555555555554) internal successors, (149), 89 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 11:58:11,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:11,304 INFO L225 Difference]: With dead ends: 413 [2021-05-06 11:58:11,304 INFO L226 Difference]: Without dead ends: 267 [2021-05-06 11:58:11,305 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 178 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9389 ImplicationChecksByTransitivity, 6076.9ms TimeCoverageRelationStatistics Valid=7263, Invalid=24957, Unknown=0, NotChecked=0, Total=32220 [2021-05-06 11:58:11,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2021-05-06 11:58:11,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 267. [2021-05-06 11:58:11,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 267 states, 262 states have (on average 1.0190839694656488) internal successors, (267), 262 states have internal predecessors, (267), 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 11:58:11,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 271 transitions. [2021-05-06 11:58:11,355 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 271 transitions. Word has length 153 [2021-05-06 11:58:11,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:11,355 INFO L480 AbstractCegarLoop]: Abstraction has 267 states and 271 transitions. [2021-05-06 11:58:11,355 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 90 states, 90 states have (on average 1.6555555555555554) internal successors, (149), 89 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 11:58:11,355 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 271 transitions. [2021-05-06 11:58:11,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-05-06 11:58:11,356 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:11,356 INFO L523 BasicCegarLoop]: trace histogram [57, 56, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:11,356 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable89 [2021-05-06 11:58:11,356 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:11,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:11,356 INFO L82 PathProgramCache]: Analyzing trace with hash -601378062, now seen corresponding path program 30 times [2021-05-06 11:58:11,356 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:11,356 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [827188186] [2021-05-06 11:58:11,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:11,362 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:11,375 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:11,376 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:11,385 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:11,387 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:11,394 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:11,407 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:11,410 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:11,410 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:11,414 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:11,422 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:11,430 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:11,430 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:11,432 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:11,432 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:11,436 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:11,444 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:11,452 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:11,454 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:11,455 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:11,456 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:11,464 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:11,465 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:11,484 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:11,499 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:11,500 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:11,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:11,912 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:11,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:11,915 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 11:58:11,915 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:11,916 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:13,650 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:13,650 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [827188186] [2021-05-06 11:58:13,650 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [827188186] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:13,650 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:13,650 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [92] imperfect sequences [] total 92 [2021-05-06 11:58:13,650 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642573354] [2021-05-06 11:58:13,651 INFO L460 AbstractCegarLoop]: Interpolant automaton has 92 states [2021-05-06 11:58:13,651 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:13,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2021-05-06 11:58:13,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2501, Invalid=5871, Unknown=0, NotChecked=0, Total=8372 [2021-05-06 11:58:13,652 INFO L87 Difference]: Start difference. First operand 267 states and 271 transitions. Second operand has 92 states, 92 states have (on average 1.6521739130434783) internal successors, (152), 91 states have internal predecessors, (152), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:20,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:20,769 INFO L93 Difference]: Finished difference Result 421 states and 435 transitions. [2021-05-06 11:58:20,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2021-05-06 11:58:20,769 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 92 states have (on average 1.6521739130434783) internal successors, (152), 91 states have internal predecessors, (152), 2 states have call successors, (3), 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 156 [2021-05-06 11:58:20,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:20,770 INFO L225 Difference]: With dead ends: 421 [2021-05-06 11:58:20,770 INFO L226 Difference]: Without dead ends: 274 [2021-05-06 11:58:20,772 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9253 ImplicationChecksByTransitivity, 6448.4ms TimeCoverageRelationStatistics Valid=7497, Invalid=25083, Unknown=0, NotChecked=0, Total=32580 [2021-05-06 11:58:20,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2021-05-06 11:58:20,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 162. [2021-05-06 11:58:20,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 157 states have (on average 1.0254777070063694) internal successors, (161), 157 states have internal predecessors, (161), 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 11:58:20,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 165 transitions. [2021-05-06 11:58:20,780 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 165 transitions. Word has length 156 [2021-05-06 11:58:20,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:20,780 INFO L480 AbstractCegarLoop]: Abstraction has 162 states and 165 transitions. [2021-05-06 11:58:20,780 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 92 states, 92 states have (on average 1.6521739130434783) internal successors, (152), 91 states have internal predecessors, (152), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:20,780 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 165 transitions. [2021-05-06 11:58:20,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-05-06 11:58:20,781 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:20,781 INFO L523 BasicCegarLoop]: trace histogram [59, 58, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:20,781 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92 [2021-05-06 11:58:20,781 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:20,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:20,781 INFO L82 PathProgramCache]: Analyzing trace with hash -719321817, now seen corresponding path program 31 times [2021-05-06 11:58:20,781 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:20,781 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [744942893] [2021-05-06 11:58:20,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:20,787 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:20,788 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:20,789 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:20,795 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:20,797 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:20,816 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:20,831 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:20,833 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:20,833 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:20,837 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:20,845 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:20,853 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:20,854 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:20,855 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:20,861 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:20,864 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:20,868 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:20,876 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:20,879 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:20,892 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:20,893 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:20,900 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:20,902 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:20,911 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:20,926 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:20,927 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:20,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:21,384 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:21,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:21,387 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 11:58:21,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:21,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:23,207 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:23,207 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [744942893] [2021-05-06 11:58:23,208 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [744942893] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:23,208 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:23,208 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [95] imperfect sequences [] total 95 [2021-05-06 11:58:23,208 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835532189] [2021-05-06 11:58:23,208 INFO L460 AbstractCegarLoop]: Interpolant automaton has 95 states [2021-05-06 11:58:23,208 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:23,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2021-05-06 11:58:23,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2662, Invalid=6268, Unknown=0, NotChecked=0, Total=8930 [2021-05-06 11:58:23,209 INFO L87 Difference]: Start difference. First operand 162 states and 165 transitions. Second operand has 95 states, 95 states have (on average 1.6526315789473685) internal successors, (157), 94 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 11:58:30,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:30,560 INFO L93 Difference]: Finished difference Result 321 states and 332 transitions. [2021-05-06 11:58:30,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2021-05-06 11:58:30,560 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 95 states have (on average 1.6526315789473685) internal successors, (157), 94 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 11:58:30,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:30,561 INFO L225 Difference]: With dead ends: 321 [2021-05-06 11:58:30,561 INFO L226 Difference]: Without dead ends: 167 [2021-05-06 11:58:30,562 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9856 ImplicationChecksByTransitivity, 6810.8ms TimeCoverageRelationStatistics Valid=7980, Invalid=26802, Unknown=0, NotChecked=0, Total=34782 [2021-05-06 11:58:30,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-05-06 11:58:30,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 167. [2021-05-06 11:58:30,578 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 11:58:30,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 170 transitions. [2021-05-06 11:58:30,580 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 170 transitions. Word has length 161 [2021-05-06 11:58:30,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:30,580 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 170 transitions. [2021-05-06 11:58:30,580 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 95 states, 95 states have (on average 1.6526315789473685) internal successors, (157), 94 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 11:58:30,580 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 170 transitions. [2021-05-06 11:58:30,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2021-05-06 11:58:30,586 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:30,586 INFO L523 BasicCegarLoop]: trace histogram [61, 60, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:30,586 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95 [2021-05-06 11:58:30,586 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:30,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:30,587 INFO L82 PathProgramCache]: Analyzing trace with hash 1655006822, now seen corresponding path program 32 times [2021-05-06 11:58:30,587 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:30,587 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2147367751] [2021-05-06 11:58:30,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:30,597 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:30,597 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:30,598 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:30,606 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:30,608 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:30,627 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:30,642 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:30,645 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:30,650 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:30,654 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:30,658 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:30,666 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:30,667 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:30,675 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:30,681 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:30,684 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:30,688 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:30,696 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:30,726 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:30,726 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:30,728 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:30,741 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:30,743 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:30,761 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:30,788 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:30,790 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:30,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:31,287 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:31,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:31,290 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 11:58:31,290 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:31,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:33,157 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:33,157 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2147367751] [2021-05-06 11:58:33,158 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2147367751] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:33,158 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:33,158 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [98] imperfect sequences [] total 98 [2021-05-06 11:58:33,158 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049987918] [2021-05-06 11:58:33,158 INFO L460 AbstractCegarLoop]: Interpolant automaton has 98 states [2021-05-06 11:58:33,158 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:33,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-05-06 11:58:33,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2828, Invalid=6678, Unknown=0, NotChecked=0, Total=9506 [2021-05-06 11:58:33,159 INFO L87 Difference]: Start difference. First operand 167 states and 170 transitions. Second operand has 98 states, 98 states have (on average 1.653061224489796) internal successors, (162), 97 states have internal predecessors, (162), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:41,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:41,058 INFO L93 Difference]: Finished difference Result 331 states and 342 transitions. [2021-05-06 11:58:41,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2021-05-06 11:58:41,059 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 1.653061224489796) internal successors, (162), 97 states have internal predecessors, (162), 2 states have call successors, (3), 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 166 [2021-05-06 11:58:41,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:41,059 INFO L225 Difference]: With dead ends: 331 [2021-05-06 11:58:41,059 INFO L226 Difference]: Without dead ends: 172 [2021-05-06 11:58:41,061 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10542 ImplicationChecksByTransitivity, 7073.4ms TimeCoverageRelationStatistics Valid=8478, Invalid=28578, Unknown=0, NotChecked=0, Total=37056 [2021-05-06 11:58:41,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-05-06 11:58:41,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 172. [2021-05-06 11:58:41,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 167 states have (on average 1.0239520958083832) internal successors, (171), 167 states have internal predecessors, (171), 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 11:58:41,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 175 transitions. [2021-05-06 11:58:41,073 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 175 transitions. Word has length 166 [2021-05-06 11:58:41,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:41,073 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 175 transitions. [2021-05-06 11:58:41,073 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 98 states, 98 states have (on average 1.653061224489796) internal successors, (162), 97 states have internal predecessors, (162), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:41,073 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 175 transitions. [2021-05-06 11:58:41,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2021-05-06 11:58:41,074 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:41,074 INFO L523 BasicCegarLoop]: trace histogram [63, 62, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:41,074 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable98 [2021-05-06 11:58:41,074 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:41,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:41,075 INFO L82 PathProgramCache]: Analyzing trace with hash -2090883917, now seen corresponding path program 33 times [2021-05-06 11:58:41,075 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:41,075 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1990352869] [2021-05-06 11:58:41,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:41,086 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:41,103 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:41,105 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:41,114 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:41,116 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:41,124 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:41,139 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:41,141 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:41,142 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:41,145 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:41,155 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:41,163 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:41,163 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:41,167 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:41,173 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:41,177 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:41,182 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:41,196 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:41,200 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:41,213 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:41,214 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:41,222 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:41,224 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:41,233 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:41,248 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:41,249 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:41,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:41,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:41,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:41,812 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 11:58:41,813 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:41,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:43,833 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:43,834 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1990352869] [2021-05-06 11:58:43,834 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1990352869] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:43,834 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:43,834 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [101] imperfect sequences [] total 101 [2021-05-06 11:58:43,834 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950867372] [2021-05-06 11:58:43,834 INFO L460 AbstractCegarLoop]: Interpolant automaton has 101 states [2021-05-06 11:58:43,834 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:43,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2021-05-06 11:58:43,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2999, Invalid=7101, Unknown=0, NotChecked=0, Total=10100 [2021-05-06 11:58:43,835 INFO L87 Difference]: Start difference. First operand 172 states and 175 transitions. Second operand has 101 states, 101 states have (on average 1.6534653465346534) internal successors, (167), 100 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 11:58:52,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:52,081 INFO L93 Difference]: Finished difference Result 341 states and 352 transitions. [2021-05-06 11:58:52,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2021-05-06 11:58:52,082 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 1.6534653465346534) internal successors, (167), 100 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 11:58:52,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:52,082 INFO L225 Difference]: With dead ends: 341 [2021-05-06 11:58:52,083 INFO L226 Difference]: Without dead ends: 177 [2021-05-06 11:58:52,084 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 197 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11218 ImplicationChecksByTransitivity, 7596.3ms TimeCoverageRelationStatistics Valid=8991, Invalid=30411, Unknown=0, NotChecked=0, Total=39402 [2021-05-06 11:58:52,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2021-05-06 11:58:52,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 177. [2021-05-06 11:58:52,092 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 11:58:52,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 180 transitions. [2021-05-06 11:58:52,093 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 180 transitions. Word has length 171 [2021-05-06 11:58:52,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:52,093 INFO L480 AbstractCegarLoop]: Abstraction has 177 states and 180 transitions. [2021-05-06 11:58:52,093 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 101 states, 101 states have (on average 1.6534653465346534) internal successors, (167), 100 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 11:58:52,093 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 180 transitions. [2021-05-06 11:58:52,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-05-06 11:58:52,094 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:52,094 INFO L523 BasicCegarLoop]: trace histogram [65, 64, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:52,094 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable101 [2021-05-06 11:58:52,094 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:52,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:52,094 INFO L82 PathProgramCache]: Analyzing trace with hash 913155034, now seen corresponding path program 34 times [2021-05-06 11:58:52,094 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:52,094 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [935073909] [2021-05-06 11:58:52,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:52,100 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:52,100 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:52,102 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:52,108 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:52,110 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:52,130 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:52,147 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:52,149 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:52,149 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:52,153 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:52,163 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:52,171 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:52,171 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:52,173 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:52,179 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:52,197 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:52,201 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:52,208 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:52,211 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:52,212 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:52,213 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:52,219 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:52,221 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:52,239 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:52,255 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:52,256 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:52,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:52,776 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:52,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:52,778 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 11:58:52,779 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:52,780 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:54,932 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:54,933 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [935073909] [2021-05-06 11:58:54,933 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [935073909] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:54,933 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:54,933 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [104] imperfect sequences [] total 104 [2021-05-06 11:58:54,933 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1828928236] [2021-05-06 11:58:54,933 INFO L460 AbstractCegarLoop]: Interpolant automaton has 104 states [2021-05-06 11:58:54,933 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:54,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2021-05-06 11:58:54,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3175, Invalid=7537, Unknown=0, NotChecked=0, Total=10712 [2021-05-06 11:58:54,934 INFO L87 Difference]: Start difference. First operand 177 states and 180 transitions. Second operand has 104 states, 104 states have (on average 1.6538461538461537) internal successors, (172), 103 states have internal predecessors, (172), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:03,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:03,622 INFO L93 Difference]: Finished difference Result 351 states and 362 transitions. [2021-05-06 11:59:03,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2021-05-06 11:59:03,623 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 104 states have (on average 1.6538461538461537) internal successors, (172), 103 states have internal predecessors, (172), 2 states have call successors, (3), 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 176 [2021-05-06 11:59:03,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:03,623 INFO L225 Difference]: With dead ends: 351 [2021-05-06 11:59:03,623 INFO L226 Difference]: Without dead ends: 182 [2021-05-06 11:59:03,625 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 203 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11915 ImplicationChecksByTransitivity, 7955.1ms TimeCoverageRelationStatistics Valid=9519, Invalid=32301, Unknown=0, NotChecked=0, Total=41820 [2021-05-06 11:59:03,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-05-06 11:59:03,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 182. [2021-05-06 11:59:03,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 177 states have (on average 1.0225988700564972) internal successors, (181), 177 states have internal predecessors, (181), 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 11:59:03,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 185 transitions. [2021-05-06 11:59:03,634 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 185 transitions. Word has length 176 [2021-05-06 11:59:03,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:03,634 INFO L480 AbstractCegarLoop]: Abstraction has 182 states and 185 transitions. [2021-05-06 11:59:03,634 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 104 states, 104 states have (on average 1.6538461538461537) internal successors, (172), 103 states have internal predecessors, (172), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:03,634 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 185 transitions. [2021-05-06 11:59:03,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2021-05-06 11:59:03,635 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:03,635 INFO L523 BasicCegarLoop]: trace histogram [67, 66, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:03,635 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable104 [2021-05-06 11:59:03,635 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:03,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:03,635 INFO L82 PathProgramCache]: Analyzing trace with hash -1615701441, now seen corresponding path program 35 times [2021-05-06 11:59:03,635 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:03,635 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1765949217] [2021-05-06 11:59:03,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:03,641 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:03,642 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:03,643 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:03,650 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:03,652 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:03,672 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:03,687 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:03,689 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:03,695 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:03,699 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:03,703 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:03,711 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:03,711 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:03,713 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:03,718 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:03,722 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:03,726 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:03,733 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:03,736 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:03,737 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:03,738 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:03,744 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:03,746 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:03,764 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:03,779 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:03,779 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:03,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:04,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:04,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:04,341 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 11:59:04,342 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:04,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:06,668 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:06,668 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1765949217] [2021-05-06 11:59:06,668 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1765949217] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:06,668 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:06,669 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [107] imperfect sequences [] total 107 [2021-05-06 11:59:06,669 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122008686] [2021-05-06 11:59:06,669 INFO L460 AbstractCegarLoop]: Interpolant automaton has 107 states [2021-05-06 11:59:06,669 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:06,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2021-05-06 11:59:06,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3356, Invalid=7986, Unknown=0, NotChecked=0, Total=11342 [2021-05-06 11:59:06,670 INFO L87 Difference]: Start difference. First operand 182 states and 185 transitions. Second operand has 107 states, 107 states have (on average 1.6542056074766356) internal successors, (177), 106 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 11:59:15,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:15,748 INFO L93 Difference]: Finished difference Result 361 states and 372 transitions. [2021-05-06 11:59:15,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2021-05-06 11:59:15,749 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 1.6542056074766356) internal successors, (177), 106 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 11:59:15,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:15,749 INFO L225 Difference]: With dead ends: 361 [2021-05-06 11:59:15,749 INFO L226 Difference]: Without dead ends: 187 [2021-05-06 11:59:15,751 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 209 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12598 ImplicationChecksByTransitivity, 8391.9ms TimeCoverageRelationStatistics Valid=10062, Invalid=34248, Unknown=0, NotChecked=0, Total=44310 [2021-05-06 11:59:15,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-05-06 11:59:15,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2021-05-06 11:59:15,772 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 11:59:15,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 190 transitions. [2021-05-06 11:59:15,773 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 190 transitions. Word has length 181 [2021-05-06 11:59:15,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:15,773 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 190 transitions. [2021-05-06 11:59:15,773 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 107 states, 107 states have (on average 1.6542056074766356) internal successors, (177), 106 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 11:59:15,773 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 190 transitions. [2021-05-06 11:59:15,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2021-05-06 11:59:15,773 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:15,779 INFO L523 BasicCegarLoop]: trace histogram [69, 68, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:15,779 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable107 [2021-05-06 11:59:15,779 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:15,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:15,779 INFO L82 PathProgramCache]: Analyzing trace with hash -2060113074, now seen corresponding path program 36 times [2021-05-06 11:59:15,779 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:15,779 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [90314519] [2021-05-06 11:59:15,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:15,794 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:15,808 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:15,810 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:15,820 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:15,822 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:15,845 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:15,860 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:15,863 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:15,868 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:15,872 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:15,876 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:15,893 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:15,894 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:15,896 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:15,896 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:15,899 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:15,908 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:15,919 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:15,938 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:15,951 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:15,952 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:15,959 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:15,961 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:15,970 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:15,994 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:15,995 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:16,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:16,797 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:16,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:16,799 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 11:59:16,800 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:16,801 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:19,249 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:19,250 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [90314519] [2021-05-06 11:59:19,250 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [90314519] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:19,250 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:19,250 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [110] imperfect sequences [] total 110 [2021-05-06 11:59:19,250 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854916055] [2021-05-06 11:59:19,250 INFO L460 AbstractCegarLoop]: Interpolant automaton has 110 states [2021-05-06 11:59:19,250 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:19,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2021-05-06 11:59:19,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3542, Invalid=8448, Unknown=0, NotChecked=0, Total=11990 [2021-05-06 11:59:19,251 INFO L87 Difference]: Start difference. First operand 187 states and 190 transitions. Second operand has 110 states, 110 states have (on average 1.6545454545454545) internal successors, (182), 109 states have internal predecessors, (182), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:26,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:26,468 INFO L93 Difference]: Finished difference Result 371 states and 382 transitions. [2021-05-06 11:59:26,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2021-05-06 11:59:26,468 INFO L78 Accepts]: Start accepts. Automaton has has 110 states, 110 states have (on average 1.6545454545454545) internal successors, (182), 109 states have internal predecessors, (182), 2 states have call successors, (3), 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 186 [2021-05-06 11:59:26,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:26,469 INFO L225 Difference]: With dead ends: 371 [2021-05-06 11:59:26,469 INFO L226 Difference]: Without dead ends: 192 [2021-05-06 11:59:26,471 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 215 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13372 ImplicationChecksByTransitivity, 7584.6ms TimeCoverageRelationStatistics Valid=10620, Invalid=36252, Unknown=0, NotChecked=0, Total=46872 [2021-05-06 11:59:26,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2021-05-06 11:59:26,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 192. [2021-05-06 11:59:26,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 187 states have (on average 1.0213903743315509) internal successors, (191), 187 states have internal predecessors, (191), 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 11:59:26,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 195 transitions. [2021-05-06 11:59:26,482 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 195 transitions. Word has length 186 [2021-05-06 11:59:26,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:26,482 INFO L480 AbstractCegarLoop]: Abstraction has 192 states and 195 transitions. [2021-05-06 11:59:26,482 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 110 states, 110 states have (on average 1.6545454545454545) internal successors, (182), 109 states have internal predecessors, (182), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:26,482 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 195 transitions. [2021-05-06 11:59:26,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-05-06 11:59:26,482 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:26,483 INFO L523 BasicCegarLoop]: trace histogram [71, 70, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:26,483 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable110 [2021-05-06 11:59:26,483 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:26,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:26,483 INFO L82 PathProgramCache]: Analyzing trace with hash 1459840459, now seen corresponding path program 37 times [2021-05-06 11:59:26,483 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:26,483 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1269792087] [2021-05-06 11:59:26,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:26,507 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:26,517 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:26,519 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:26,524 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:26,526 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:26,533 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:26,543 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:26,545 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:26,546 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:26,548 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:26,555 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:26,560 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:26,560 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:26,562 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:26,562 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:26,565 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:26,571 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:26,576 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:26,579 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:26,579 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:26,580 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:26,586 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:26,588 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:26,602 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:26,611 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:26,612 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:26,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:27,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:27,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:27,172 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:59:27,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:27,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:29,716 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:29,716 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1269792087] [2021-05-06 11:59:29,716 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1269792087] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:29,716 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:29,716 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [113] imperfect sequences [] total 113 [2021-05-06 11:59:29,716 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355989186] [2021-05-06 11:59:29,716 INFO L460 AbstractCegarLoop]: Interpolant automaton has 113 states [2021-05-06 11:59:29,716 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:29,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2021-05-06 11:59:29,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3733, Invalid=8923, Unknown=0, NotChecked=0, Total=12656 [2021-05-06 11:59:29,717 INFO L87 Difference]: Start difference. First operand 192 states and 195 transitions. Second operand has 113 states, 113 states have (on average 1.654867256637168) internal successors, (187), 112 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 11:59:39,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:39,016 INFO L93 Difference]: Finished difference Result 381 states and 392 transitions. [2021-05-06 11:59:39,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2021-05-06 11:59:39,017 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 113 states have (on average 1.654867256637168) internal successors, (187), 112 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 11:59:39,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:39,017 INFO L225 Difference]: With dead ends: 381 [2021-05-06 11:59:39,017 INFO L226 Difference]: Without dead ends: 197 [2021-05-06 11:59:39,019 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 221 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14095 ImplicationChecksByTransitivity, 8883.8ms TimeCoverageRelationStatistics Valid=11193, Invalid=38313, Unknown=0, NotChecked=0, Total=49506 [2021-05-06 11:59:39,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-05-06 11:59:39,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 197. [2021-05-06 11:59:39,029 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 11:59:39,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 200 transitions. [2021-05-06 11:59:39,029 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 200 transitions. Word has length 191 [2021-05-06 11:59:39,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:39,029 INFO L480 AbstractCegarLoop]: Abstraction has 197 states and 200 transitions. [2021-05-06 11:59:39,029 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 113 states, 113 states have (on average 1.654867256637168) internal successors, (187), 112 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 11:59:39,029 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 200 transitions. [2021-05-06 11:59:39,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2021-05-06 11:59:39,030 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:39,030 INFO L523 BasicCegarLoop]: trace histogram [73, 72, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:39,030 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable113 [2021-05-06 11:59:39,030 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:39,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:39,030 INFO L82 PathProgramCache]: Analyzing trace with hash 1618001090, now seen corresponding path program 38 times [2021-05-06 11:59:39,030 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:39,030 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1345694834] [2021-05-06 11:59:39,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:39,037 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:39,050 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:39,051 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:39,058 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:39,060 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:39,068 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:39,084 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:39,086 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:39,092 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:39,096 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:39,100 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:39,107 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:39,108 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:39,110 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:39,115 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:39,119 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:39,123 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:39,131 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:39,134 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:39,135 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:39,136 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:39,144 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:39,145 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:39,165 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:39,180 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:39,181 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:39,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:39,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:39,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:39,823 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 11:59:39,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:39,825 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:42,504 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:42,504 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1345694834] [2021-05-06 11:59:42,504 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1345694834] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:42,504 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:42,504 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [116] imperfect sequences [] total 116 [2021-05-06 11:59:42,504 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951807448] [2021-05-06 11:59:42,505 INFO L460 AbstractCegarLoop]: Interpolant automaton has 116 states [2021-05-06 11:59:42,505 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:42,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2021-05-06 11:59:42,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3929, Invalid=9411, Unknown=0, NotChecked=0, Total=13340 [2021-05-06 11:59:42,506 INFO L87 Difference]: Start difference. First operand 197 states and 200 transitions. Second operand has 116 states, 116 states have (on average 1.6551724137931034) internal successors, (192), 115 states have internal predecessors, (192), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:53,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:53,120 INFO L93 Difference]: Finished difference Result 391 states and 402 transitions. [2021-05-06 11:59:53,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2021-05-06 11:59:53,121 INFO L78 Accepts]: Start accepts. Automaton has has 116 states, 116 states have (on average 1.6551724137931034) internal successors, (192), 115 states have internal predecessors, (192), 2 states have call successors, (3), 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 196 [2021-05-06 11:59:53,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:53,121 INFO L225 Difference]: With dead ends: 391 [2021-05-06 11:59:53,121 INFO L226 Difference]: Without dead ends: 202 [2021-05-06 11:59:53,123 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 80 SyntacticMatches, 1 SemanticMatches, 227 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14913 ImplicationChecksByTransitivity, 9661.7ms TimeCoverageRelationStatistics Valid=11781, Invalid=40431, Unknown=0, NotChecked=0, Total=52212 [2021-05-06 11:59:53,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2021-05-06 11:59:53,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 202. [2021-05-06 11:59:53,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 197 states have (on average 1.0203045685279188) internal successors, (201), 197 states have internal predecessors, (201), 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 11:59:53,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 205 transitions. [2021-05-06 11:59:53,134 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 205 transitions. Word has length 196 [2021-05-06 11:59:53,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:53,134 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 205 transitions. [2021-05-06 11:59:53,134 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 116 states, 116 states have (on average 1.6551724137931034) internal successors, (192), 115 states have internal predecessors, (192), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:53,134 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 205 transitions. [2021-05-06 11:59:53,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2021-05-06 11:59:53,134 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:53,135 INFO L523 BasicCegarLoop]: trace histogram [75, 74, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:53,135 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable116 [2021-05-06 11:59:53,135 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:53,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:53,135 INFO L82 PathProgramCache]: Analyzing trace with hash 8259415, now seen corresponding path program 39 times [2021-05-06 11:59:53,135 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:53,135 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1165387272] [2021-05-06 11:59:53,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:53,141 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:53,142 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:53,143 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:53,151 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:53,153 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:53,173 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:53,189 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:53,191 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:53,191 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:53,196 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:53,206 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:53,213 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:53,214 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:53,216 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:53,221 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:53,225 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:53,229 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:53,237 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:53,240 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:53,240 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:53,241 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:53,249 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:53,250 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:53,270 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:53,285 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:53,286 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:53,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:54,026 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:54,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:54,029 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 11:59:54,030 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:56,818 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:56,819 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1165387272] [2021-05-06 11:59:56,819 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1165387272] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:56,819 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:56,819 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [119] imperfect sequences [] total 119 [2021-05-06 11:59:56,819 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [993009036] [2021-05-06 11:59:56,819 INFO L460 AbstractCegarLoop]: Interpolant automaton has 119 states [2021-05-06 11:59:56,819 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:56,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2021-05-06 11:59:56,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4299, Invalid=10463, Unknown=0, NotChecked=0, Total=14762 [2021-05-06 11:59:56,820 INFO L87 Difference]: Start difference. First operand 202 states and 205 transitions. Second operand has 119 states, 119 states have (on average 1.6554621848739495) internal successors, (197), 118 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 12:00:08,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:08,913 INFO L93 Difference]: Finished difference Result 547 states and 558 transitions. [2021-05-06 12:00:08,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2021-05-06 12:00:08,914 INFO L78 Accepts]: Start accepts. Automaton has has 119 states, 119 states have (on average 1.6554621848739495) internal successors, (197), 118 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 12:00:08,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:08,915 INFO L225 Difference]: With dead ends: 547 [2021-05-06 12:00:08,915 INFO L226 Difference]: Without dead ends: 353 [2021-05-06 12:00:08,918 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 236 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16482 ImplicationChecksByTransitivity, 10875.1ms TimeCoverageRelationStatistics Valid=12558, Invalid=43848, Unknown=0, NotChecked=0, Total=56406 [2021-05-06 12:00:08,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2021-05-06 12:00:08,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 353. [2021-05-06 12:00:08,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 353 states, 348 states have (on average 1.014367816091954) internal successors, (353), 348 states have internal predecessors, (353), 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 12:00:08,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 353 states to 353 states and 357 transitions. [2021-05-06 12:00:08,949 INFO L78 Accepts]: Start accepts. Automaton has 353 states and 357 transitions. Word has length 201 [2021-05-06 12:00:08,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:08,949 INFO L480 AbstractCegarLoop]: Abstraction has 353 states and 357 transitions. [2021-05-06 12:00:08,949 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 119 states, 119 states have (on average 1.6554621848739495) internal successors, (197), 118 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 12:00:08,950 INFO L276 IsEmpty]: Start isEmpty. Operand 353 states and 357 transitions. [2021-05-06 12:00:08,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2021-05-06 12:00:08,950 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:08,950 INFO L523 BasicCegarLoop]: trace histogram [76, 75, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:08,951 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable119 [2021-05-06 12:00:08,951 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:08,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:08,951 INFO L82 PathProgramCache]: Analyzing trace with hash -1351123407, now seen corresponding path program 40 times [2021-05-06 12:00:08,951 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:08,951 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2129475987] [2021-05-06 12:00:08,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:08,971 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:08,986 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:08,988 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:08,998 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:09,000 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:09,011 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:09,029 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:09,032 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:00:09,040 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:09,045 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:09,050 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:00:09,059 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:09,060 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:09,062 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:00:09,062 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:09,067 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:09,078 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:00:09,087 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:09,091 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:09,092 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:09,093 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:09,103 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:09,105 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:09,127 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:09,144 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:09,145 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:09,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:09,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:09,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:09,967 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 12:00:09,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:09,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:13,177 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:13,177 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2129475987] [2021-05-06 12:00:13,178 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2129475987] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:13,178 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:13,178 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [121] imperfect sequences [] total 121 [2021-05-06 12:00:13,178 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466722154] [2021-05-06 12:00:13,178 INFO L460 AbstractCegarLoop]: Interpolant automaton has 121 states [2021-05-06 12:00:13,178 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:13,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2021-05-06 12:00:13,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4292, Invalid=10228, Unknown=0, NotChecked=0, Total=14520 [2021-05-06 12:00:13,180 INFO L87 Difference]: Start difference. First operand 353 states and 357 transitions. Second operand has 121 states, 121 states have (on average 1.6528925619834711) internal successors, (200), 120 states have internal predecessors, (200), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:26,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:26,125 INFO L93 Difference]: Finished difference Result 555 states and 569 transitions. [2021-05-06 12:00:26,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2021-05-06 12:00:26,125 INFO L78 Accepts]: Start accepts. Automaton has has 121 states, 121 states have (on average 1.6528925619834711) internal successors, (200), 120 states have internal predecessors, (200), 2 states have call successors, (3), 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 204 [2021-05-06 12:00:26,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:26,126 INFO L225 Difference]: With dead ends: 555 [2021-05-06 12:00:26,126 INFO L226 Difference]: Without dead ends: 360 [2021-05-06 12:00:26,129 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 321 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 237 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16299 ImplicationChecksByTransitivity, 11848.5ms TimeCoverageRelationStatistics Valid=12870, Invalid=44012, Unknown=0, NotChecked=0, Total=56882 [2021-05-06 12:00:26,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2021-05-06 12:00:26,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 210. [2021-05-06 12:00:26,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 205 states have (on average 1.0195121951219512) internal successors, (209), 205 states have internal predecessors, (209), 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 12:00:26,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 213 transitions. [2021-05-06 12:00:26,142 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 213 transitions. Word has length 204 [2021-05-06 12:00:26,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:26,142 INFO L480 AbstractCegarLoop]: Abstraction has 210 states and 213 transitions. [2021-05-06 12:00:26,142 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 121 states, 121 states have (on average 1.6528925619834711) internal successors, (200), 120 states have internal predecessors, (200), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:26,142 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 213 transitions. [2021-05-06 12:00:26,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2021-05-06 12:00:26,143 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:26,143 INFO L523 BasicCegarLoop]: trace histogram [78, 77, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:26,143 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable122 [2021-05-06 12:00:26,143 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:26,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:26,143 INFO L82 PathProgramCache]: Analyzing trace with hash -1234002488, now seen corresponding path program 41 times [2021-05-06 12:00:26,143 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:26,143 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [514125677] [2021-05-06 12:00:26,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:26,149 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:26,150 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:26,151 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:26,157 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:26,159 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:26,178 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:26,191 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:26,193 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:00:26,194 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:26,197 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:26,205 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:00:26,212 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:26,212 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:26,214 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:00:26,215 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:26,218 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:26,226 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:00:26,233 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:26,236 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:26,237 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:26,238 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:26,246 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:26,248 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:26,271 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:26,286 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:26,287 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:26,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:27,051 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:27,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:27,054 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 12:00:27,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:27,056 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:30,206 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:30,207 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [514125677] [2021-05-06 12:00:30,207 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [514125677] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:30,207 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:30,207 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [124] imperfect sequences [] total 124 [2021-05-06 12:00:30,207 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [334042335] [2021-05-06 12:00:30,207 INFO L460 AbstractCegarLoop]: Interpolant automaton has 124 states [2021-05-06 12:00:30,207 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:30,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2021-05-06 12:00:30,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4502, Invalid=10750, Unknown=0, NotChecked=0, Total=15252 [2021-05-06 12:00:30,209 INFO L87 Difference]: Start difference. First operand 210 states and 213 transitions. Second operand has 124 states, 124 states have (on average 1.653225806451613) internal successors, (205), 123 states have internal predecessors, (205), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:43,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:43,602 INFO L93 Difference]: Finished difference Result 417 states and 428 transitions. [2021-05-06 12:00:43,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2021-05-06 12:00:43,603 INFO L78 Accepts]: Start accepts. Automaton has has 124 states, 124 states have (on average 1.653225806451613) internal successors, (205), 123 states have internal predecessors, (205), 2 states have call successors, (3), 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 209 [2021-05-06 12:00:43,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:43,604 INFO L225 Difference]: With dead ends: 417 [2021-05-06 12:00:43,604 INFO L226 Difference]: Without dead ends: 215 [2021-05-06 12:00:43,608 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 85 SyntacticMatches, 1 SemanticMatches, 243 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17137 ImplicationChecksByTransitivity, 11720.5ms TimeCoverageRelationStatistics Valid=13500, Invalid=46280, Unknown=0, NotChecked=0, Total=59780 [2021-05-06 12:00:43,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2021-05-06 12:00:43,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 215. [2021-05-06 12:00:43,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 210 states have (on average 1.019047619047619) internal successors, (214), 210 states have internal predecessors, (214), 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 12:00:43,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 218 transitions. [2021-05-06 12:00:43,627 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 218 transitions. Word has length 209 [2021-05-06 12:00:43,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:43,627 INFO L480 AbstractCegarLoop]: Abstraction has 215 states and 218 transitions. [2021-05-06 12:00:43,628 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 124 states, 124 states have (on average 1.653225806451613) internal successors, (205), 123 states have internal predecessors, (205), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:43,628 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 218 transitions. [2021-05-06 12:00:43,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2021-05-06 12:00:43,629 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:43,629 INFO L523 BasicCegarLoop]: trace histogram [80, 79, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:43,629 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable125 [2021-05-06 12:00:43,629 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:43,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:43,629 INFO L82 PathProgramCache]: Analyzing trace with hash -818256411, now seen corresponding path program 42 times [2021-05-06 12:00:43,630 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:43,630 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1946654770] [2021-05-06 12:00:43,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:43,639 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:43,640 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:43,643 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:43,650 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:43,651 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:43,668 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:43,700 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:43,703 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:00:43,703 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:43,706 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:43,714 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:00:43,721 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:43,722 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:43,724 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:00:43,729 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:43,733 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:43,737 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:00:43,743 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:43,747 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:43,748 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:43,751 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:43,759 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:43,762 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:43,780 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:43,790 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:43,791 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:43,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:44,598 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:44,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:44,601 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 12:00:44,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:44,603 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:47,964 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:47,964 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1946654770] [2021-05-06 12:00:47,964 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1946654770] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:47,964 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:47,964 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [127] imperfect sequences [] total 127 [2021-05-06 12:00:47,964 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456056053] [2021-05-06 12:00:47,965 INFO L460 AbstractCegarLoop]: Interpolant automaton has 127 states [2021-05-06 12:00:47,965 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:47,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2021-05-06 12:00:47,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4717, Invalid=11285, Unknown=0, NotChecked=0, Total=16002 [2021-05-06 12:00:47,966 INFO L87 Difference]: Start difference. First operand 215 states and 218 transitions. Second operand has 127 states, 127 states have (on average 1.6535433070866141) internal successors, (210), 126 states have internal predecessors, (210), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:01,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:01:01,620 INFO L93 Difference]: Finished difference Result 427 states and 438 transitions. [2021-05-06 12:01:01,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2021-05-06 12:01:01,620 INFO L78 Accepts]: Start accepts. Automaton has has 127 states, 127 states have (on average 1.6535433070866141) internal successors, (210), 126 states have internal predecessors, (210), 2 states have call successors, (3), 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 214 [2021-05-06 12:01:01,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:01:01,621 INFO L225 Difference]: With dead ends: 427 [2021-05-06 12:01:01,621 INFO L226 Difference]: Without dead ends: 220 [2021-05-06 12:01:01,624 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 249 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17954 ImplicationChecksByTransitivity, 12375.1ms TimeCoverageRelationStatistics Valid=14145, Invalid=48605, Unknown=0, NotChecked=0, Total=62750 [2021-05-06 12:01:01,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2021-05-06 12:01:01,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 220. [2021-05-06 12:01:01,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 215 states have (on average 1.0186046511627906) internal successors, (219), 215 states have internal predecessors, (219), 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 12:01:01,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 223 transitions. [2021-05-06 12:01:01,649 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 223 transitions. Word has length 214 [2021-05-06 12:01:01,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:01:01,649 INFO L480 AbstractCegarLoop]: Abstraction has 220 states and 223 transitions. [2021-05-06 12:01:01,649 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 127 states, 127 states have (on average 1.6535433070866141) internal successors, (210), 126 states have internal predecessors, (210), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:01,649 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 223 transitions. [2021-05-06 12:01:01,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2021-05-06 12:01:01,650 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:01:01,650 INFO L523 BasicCegarLoop]: trace histogram [82, 81, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:01:01,664 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable128 [2021-05-06 12:01:01,664 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:01:01,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:01:01,665 INFO L82 PathProgramCache]: Analyzing trace with hash -502755052, now seen corresponding path program 43 times [2021-05-06 12:01:01,665 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:01:01,665 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1262559165] [2021-05-06 12:01:01,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:01:01,672 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:01,700 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:01,702 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:01,709 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:01,711 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:01,719 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:01,738 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:01,746 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:01:01,752 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:01,760 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:01,764 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:01:01,772 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:01,773 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:01,775 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:01:01,781 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:01,785 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:01,789 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:01:01,798 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:01,801 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:01,816 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:01,837 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:01,845 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:01,847 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:01,859 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:01,875 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:01,876 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:01,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:02,826 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:01:02,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:02,829 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 12:01:02,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:06,192 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:01:06,192 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1262559165] [2021-05-06 12:01:06,192 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1262559165] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:01:06,192 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:01:06,192 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [130] imperfect sequences [] total 130 [2021-05-06 12:01:06,192 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953936461] [2021-05-06 12:01:06,193 INFO L460 AbstractCegarLoop]: Interpolant automaton has 130 states [2021-05-06 12:01:06,193 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:01:06,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2021-05-06 12:01:06,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5121, Invalid=12435, Unknown=0, NotChecked=0, Total=17556 [2021-05-06 12:01:06,194 INFO L87 Difference]: Start difference. First operand 220 states and 223 transitions. Second operand has 130 states, 130 states have (on average 1.6538461538461537) internal successors, (215), 129 states have internal predecessors, (215), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:19,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:01:19,268 INFO L93 Difference]: Finished difference Result 597 states and 608 transitions. [2021-05-06 12:01:19,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2021-05-06 12:01:19,269 INFO L78 Accepts]: Start accepts. Automaton has has 130 states, 130 states have (on average 1.6538461538461537) internal successors, (215), 129 states have internal predecessors, (215), 2 states have call successors, (3), 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 219 [2021-05-06 12:01:19,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:01:19,270 INFO L225 Difference]: With dead ends: 597 [2021-05-06 12:01:19,270 INFO L226 Difference]: Without dead ends: 385 [2021-05-06 12:01:19,273 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 88 SyntacticMatches, 1 SemanticMatches, 258 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19715 ImplicationChecksByTransitivity, 12109.6ms TimeCoverageRelationStatistics Valid=14994, Invalid=52346, Unknown=0, NotChecked=0, Total=67340 [2021-05-06 12:01:19,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2021-05-06 12:01:19,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 385. [2021-05-06 12:01:19,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 385 states, 380 states have (on average 1.013157894736842) internal successors, (385), 380 states have internal predecessors, (385), 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 12:01:19,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 385 states to 385 states and 389 transitions. [2021-05-06 12:01:19,326 INFO L78 Accepts]: Start accepts. Automaton has 385 states and 389 transitions. Word has length 219 [2021-05-06 12:01:19,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:01:19,326 INFO L480 AbstractCegarLoop]: Abstraction has 385 states and 389 transitions. [2021-05-06 12:01:19,326 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 130 states, 130 states have (on average 1.6538461538461537) internal successors, (215), 129 states have internal predecessors, (215), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:19,326 INFO L276 IsEmpty]: Start isEmpty. Operand 385 states and 389 transitions. [2021-05-06 12:01:19,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2021-05-06 12:01:19,327 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:01:19,327 INFO L523 BasicCegarLoop]: trace histogram [83, 82, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:01:19,327 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable131 [2021-05-06 12:01:19,327 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:01:19,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:01:19,328 INFO L82 PathProgramCache]: Analyzing trace with hash 1004717268, now seen corresponding path program 44 times [2021-05-06 12:01:19,328 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:01:19,328 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2134072351] [2021-05-06 12:01:19,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:01:19,334 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:19,348 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:19,351 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:19,359 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:19,361 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:19,370 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:19,394 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:19,396 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:01:19,397 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:19,400 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:19,409 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:01:19,416 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:19,417 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:19,418 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:01:19,424 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:19,427 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:19,431 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:01:19,439 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:19,442 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:19,456 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:19,457 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:19,464 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:19,465 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:19,474 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:19,489 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:19,490 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:19,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:20,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:01:20,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:20,305 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 12:01:20,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:20,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:23,753 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:01:23,754 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2134072351] [2021-05-06 12:01:23,754 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2134072351] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:01:23,754 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:01:23,754 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [132] imperfect sequences [] total 132 [2021-05-06 12:01:23,754 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1445645727] [2021-05-06 12:01:23,754 INFO L460 AbstractCegarLoop]: Interpolant automaton has 132 states [2021-05-06 12:01:23,754 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:01:23,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2021-05-06 12:01:23,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5114, Invalid=12178, Unknown=0, NotChecked=0, Total=17292 [2021-05-06 12:01:23,755 INFO L87 Difference]: Start difference. First operand 385 states and 389 transitions. Second operand has 132 states, 132 states have (on average 1.6515151515151516) internal successors, (218), 131 states have internal predecessors, (218), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:37,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:01:37,107 INFO L93 Difference]: Finished difference Result 605 states and 619 transitions. [2021-05-06 12:01:37,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2021-05-06 12:01:37,108 INFO L78 Accepts]: Start accepts. Automaton has has 132 states, 132 states have (on average 1.6515151515151516) internal successors, (218), 131 states have internal predecessors, (218), 2 states have call successors, (3), 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 222 [2021-05-06 12:01:37,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:01:37,110 INFO L225 Difference]: With dead ends: 605 [2021-05-06 12:01:37,110 INFO L226 Difference]: Without dead ends: 392 [2021-05-06 12:01:37,113 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 90 SyntacticMatches, 1 SemanticMatches, 259 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19515 ImplicationChecksByTransitivity, 12211.9ms TimeCoverageRelationStatistics Valid=15336, Invalid=52524, Unknown=0, NotChecked=0, Total=67860 [2021-05-06 12:01:37,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 392 states. [2021-05-06 12:01:37,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 392 to 228. [2021-05-06 12:01:37,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 223 states have (on average 1.0179372197309418) internal successors, (227), 223 states have internal predecessors, (227), 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 12:01:37,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 231 transitions. [2021-05-06 12:01:37,132 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 231 transitions. Word has length 222 [2021-05-06 12:01:37,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:01:37,132 INFO L480 AbstractCegarLoop]: Abstraction has 228 states and 231 transitions. [2021-05-06 12:01:37,133 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 132 states, 132 states have (on average 1.6515151515151516) internal successors, (218), 131 states have internal predecessors, (218), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:37,133 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 231 transitions. [2021-05-06 12:01:37,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2021-05-06 12:01:37,134 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:01:37,134 INFO L523 BasicCegarLoop]: trace histogram [85, 84, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:01:37,134 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable134 [2021-05-06 12:01:37,134 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:01:37,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:01:37,134 INFO L82 PathProgramCache]: Analyzing trace with hash 2144909829, now seen corresponding path program 45 times [2021-05-06 12:01:37,134 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:01:37,134 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1740683607] [2021-05-06 12:01:37,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:01:37,142 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:37,143 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:37,144 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:37,154 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:37,156 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:37,176 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:37,192 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:37,195 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:01:37,201 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:37,205 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:37,209 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:01:37,216 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:37,217 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:37,219 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:01:37,219 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:37,223 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:37,232 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:01:37,239 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:37,242 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:37,243 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:37,244 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:37,252 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:37,254 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:37,273 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:37,286 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:37,287 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:37,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:38,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:01:38,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:38,250 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 12:01:38,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:41,769 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:01:41,770 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1740683607] [2021-05-06 12:01:41,770 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1740683607] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:01:41,770 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:01:41,770 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [135] imperfect sequences [] total 135 [2021-05-06 12:01:41,770 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997882992] [2021-05-06 12:01:41,770 INFO L460 AbstractCegarLoop]: Interpolant automaton has 135 states [2021-05-06 12:01:41,770 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:01:41,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 135 interpolants. [2021-05-06 12:01:41,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5534, Invalid=13372, Unknown=0, NotChecked=0, Total=18906 [2021-05-06 12:01:41,772 INFO L87 Difference]: Start difference. First operand 228 states and 231 transitions. Second operand has 135 states, 135 states have (on average 1.651851851851852) internal successors, (223), 134 states have internal predecessors, (223), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:55,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:01:55,811 INFO L93 Difference]: Finished difference Result 619 states and 630 transitions. [2021-05-06 12:01:55,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 135 states. [2021-05-06 12:01:55,811 INFO L78 Accepts]: Start accepts. Automaton has has 135 states, 135 states have (on average 1.651851851851852) internal successors, (223), 134 states have internal predecessors, (223), 2 states have call successors, (3), 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 227 [2021-05-06 12:01:55,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:01:55,812 INFO L225 Difference]: With dead ends: 619 [2021-05-06 12:01:55,812 INFO L226 Difference]: Without dead ends: 399 [2021-05-06 12:01:55,815 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 91 SyntacticMatches, 1 SemanticMatches, 268 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21302 ImplicationChecksByTransitivity, 12555.4ms TimeCoverageRelationStatistics Valid=16219, Invalid=56411, Unknown=0, NotChecked=0, Total=72630 [2021-05-06 12:01:55,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 399 states. [2021-05-06 12:01:55,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 399 to 399. [2021-05-06 12:01:55,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 399 states, 394 states have (on average 1.0126903553299493) internal successors, (399), 394 states have internal predecessors, (399), 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 12:01:55,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 403 transitions. [2021-05-06 12:01:55,834 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 403 transitions. Word has length 227 [2021-05-06 12:01:55,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:01:55,835 INFO L480 AbstractCegarLoop]: Abstraction has 399 states and 403 transitions. [2021-05-06 12:01:55,835 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 135 states, 135 states have (on average 1.651851851851852) internal successors, (223), 134 states have internal predecessors, (223), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:55,835 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 403 transitions. [2021-05-06 12:01:55,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2021-05-06 12:01:55,835 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:01:55,836 INFO L523 BasicCegarLoop]: trace histogram [86, 85, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:01:55,836 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable137 [2021-05-06 12:01:55,836 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:01:55,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:01:55,836 INFO L82 PathProgramCache]: Analyzing trace with hash 192800003, now seen corresponding path program 46 times [2021-05-06 12:01:55,836 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:01:55,836 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [891162131] [2021-05-06 12:01:55,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:01:55,846 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:55,862 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:55,864 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:55,869 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:55,870 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:55,876 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:55,885 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:55,889 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:01:55,893 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:55,895 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:55,897 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:01:55,902 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:55,902 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:55,903 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:01:55,904 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:55,906 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:55,912 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:01:55,916 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:55,945 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:55,946 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:55,947 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:55,953 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:55,955 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:55,968 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:55,977 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:55,978 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:55,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:56,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:01:56,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:56,709 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 12:01:56,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:56,710 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:59,664 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:01:59,664 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [891162131] [2021-05-06 12:01:59,665 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [891162131] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:01:59,665 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:01:59,665 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [137] imperfect sequences [] total 137 [2021-05-06 12:01:59,665 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743084059] [2021-05-06 12:01:59,665 INFO L460 AbstractCegarLoop]: Interpolant automaton has 137 states [2021-05-06 12:01:59,665 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:01:59,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2021-05-06 12:01:59,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5527, Invalid=13105, Unknown=0, NotChecked=0, Total=18632 [2021-05-06 12:01:59,667 INFO L87 Difference]: Start difference. First operand 399 states and 403 transitions. Second operand has 137 states, 137 states have (on average 1.6496350364963503) internal successors, (226), 136 states have internal predecessors, (226), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:12,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:02:12,831 INFO L93 Difference]: Finished difference Result 627 states and 641 transitions. [2021-05-06 12:02:12,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2021-05-06 12:02:12,832 INFO L78 Accepts]: Start accepts. Automaton has has 137 states, 137 states have (on average 1.6496350364963503) internal successors, (226), 136 states have internal predecessors, (226), 2 states have call successors, (3), 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 230 [2021-05-06 12:02:12,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:02:12,833 INFO L225 Difference]: With dead ends: 627 [2021-05-06 12:02:12,833 INFO L226 Difference]: Without dead ends: 406 [2021-05-06 12:02:12,836 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 93 SyntacticMatches, 1 SemanticMatches, 269 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21095 ImplicationChecksByTransitivity, 11803.3ms TimeCoverageRelationStatistics Valid=16575, Invalid=56595, Unknown=0, NotChecked=0, Total=73170 [2021-05-06 12:02:12,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2021-05-06 12:02:12,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 236. [2021-05-06 12:02:12,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 236 states, 231 states have (on average 1.0173160173160174) internal successors, (235), 231 states have internal predecessors, (235), 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 12:02:12,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 239 transitions. [2021-05-06 12:02:12,847 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 239 transitions. Word has length 230 [2021-05-06 12:02:12,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:02:12,847 INFO L480 AbstractCegarLoop]: Abstraction has 236 states and 239 transitions. [2021-05-06 12:02:12,848 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 137 states, 137 states have (on average 1.6496350364963503) internal successors, (226), 136 states have internal predecessors, (226), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:12,848 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 239 transitions. [2021-05-06 12:02:12,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 236 [2021-05-06 12:02:12,848 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:02:12,848 INFO L523 BasicCegarLoop]: trace histogram [88, 87, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:02:12,848 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable140 [2021-05-06 12:02:12,849 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:02:12,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:02:12,849 INFO L82 PathProgramCache]: Analyzing trace with hash 1589922230, now seen corresponding path program 47 times [2021-05-06 12:02:12,849 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:02:12,849 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1294382802] [2021-05-06 12:02:12,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:02:12,878 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:12,879 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:12,880 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:12,887 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:12,889 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:12,905 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:12,918 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:12,921 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:02:12,921 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:12,925 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:12,933 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:02:12,940 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:12,941 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:12,942 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:02:12,942 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:12,946 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:12,955 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:02:12,962 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:12,965 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:12,979 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:12,980 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:12,987 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:12,989 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:12,997 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:13,011 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:13,012 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:13,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:14,027 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:02:14,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:14,029 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 12:02:14,031 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:17,754 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:02:17,754 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1294382802] [2021-05-06 12:02:17,754 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1294382802] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:02:17,754 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:02:17,754 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [140] imperfect sequences [] total 140 [2021-05-06 12:02:17,754 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329072747] [2021-05-06 12:02:17,755 INFO L460 AbstractCegarLoop]: Interpolant automaton has 140 states [2021-05-06 12:02:17,755 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:02:17,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2021-05-06 12:02:17,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5963, Invalid=14343, Unknown=0, NotChecked=0, Total=20306 [2021-05-06 12:02:17,756 INFO L87 Difference]: Start difference. First operand 236 states and 239 transitions. Second operand has 140 states, 140 states have (on average 1.65) internal successors, (231), 139 states have internal predecessors, (231), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:33,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:02:33,144 INFO L93 Difference]: Finished difference Result 641 states and 652 transitions. [2021-05-06 12:02:33,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 140 states. [2021-05-06 12:02:33,144 INFO L78 Accepts]: Start accepts. Automaton has has 140 states, 140 states have (on average 1.65) internal successors, (231), 139 states have internal predecessors, (231), 2 states have call successors, (3), 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 235 [2021-05-06 12:02:33,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:02:33,145 INFO L225 Difference]: With dead ends: 641 [2021-05-06 12:02:33,145 INFO L226 Difference]: Without dead ends: 413 [2021-05-06 12:02:33,148 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 373 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 278 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22950 ImplicationChecksByTransitivity, 13909.8ms TimeCoverageRelationStatistics Valid=17492, Invalid=60628, Unknown=0, NotChecked=0, Total=78120 [2021-05-06 12:02:33,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 413 states. [2021-05-06 12:02:33,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 413 to 413. [2021-05-06 12:02:33,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 413 states, 408 states have (on average 1.0122549019607843) internal successors, (413), 408 states have internal predecessors, (413), 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 12:02:33,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 417 transitions. [2021-05-06 12:02:33,170 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 417 transitions. Word has length 235 [2021-05-06 12:02:33,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:02:33,171 INFO L480 AbstractCegarLoop]: Abstraction has 413 states and 417 transitions. [2021-05-06 12:02:33,171 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 140 states, 140 states have (on average 1.65) internal successors, (231), 139 states have internal predecessors, (231), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:33,171 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 417 transitions. [2021-05-06 12:02:33,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 239 [2021-05-06 12:02:33,172 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:02:33,172 INFO L523 BasicCegarLoop]: trace histogram [89, 88, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:02:33,172 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable143 [2021-05-06 12:02:33,172 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:02:33,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:02:33,172 INFO L82 PathProgramCache]: Analyzing trace with hash 1980724850, now seen corresponding path program 48 times [2021-05-06 12:02:33,172 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:02:33,172 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [579557128] [2021-05-06 12:02:33,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:02:33,178 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:33,179 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:33,179 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:33,187 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:33,188 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:33,205 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:33,217 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:33,220 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:02:33,220 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:33,223 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:33,231 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:02:33,238 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:33,238 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:33,244 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:02:33,249 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:33,253 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:33,256 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:02:33,263 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:33,266 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:33,267 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:33,269 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:33,275 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:33,277 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:33,295 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:33,310 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:33,310 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:33,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:34,350 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:02:34,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:34,353 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 12:02:34,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:38,229 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:02:38,229 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [579557128] [2021-05-06 12:02:38,229 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [579557128] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:02:38,229 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:02:38,229 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [142] imperfect sequences [] total 142 [2021-05-06 12:02:38,229 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240708129] [2021-05-06 12:02:38,230 INFO L460 AbstractCegarLoop]: Interpolant automaton has 142 states [2021-05-06 12:02:38,230 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:02:38,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 142 interpolants. [2021-05-06 12:02:38,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6157, Invalid=14723, Unknown=0, NotChecked=0, Total=20880 [2021-05-06 12:02:38,231 INFO L87 Difference]: Start difference. First operand 413 states and 417 transitions. Second operand has 142 states, 142 states have (on average 1.647887323943662) internal successors, (234), 141 states have internal predecessors, (234), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:52,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:02:52,624 INFO L93 Difference]: Finished difference Result 645 states and 655 transitions. [2021-05-06 12:02:52,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2021-05-06 12:02:52,625 INFO L78 Accepts]: Start accepts. Automaton has has 142 states, 142 states have (on average 1.647887323943662) internal successors, (234), 141 states have internal predecessors, (234), 2 states have call successors, (3), 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 238 [2021-05-06 12:02:52,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:02:52,627 INFO L225 Difference]: With dead ends: 645 [2021-05-06 12:02:52,627 INFO L226 Difference]: Without dead ends: 416 [2021-05-06 12:02:52,631 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 95 SyntacticMatches, 1 SemanticMatches, 282 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23651 ImplicationChecksByTransitivity, 13132.2ms TimeCoverageRelationStatistics Valid=18068, Invalid=62304, Unknown=0, NotChecked=0, Total=80372 [2021-05-06 12:02:52,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 416 states. [2021-05-06 12:02:52,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 416 to 416. [2021-05-06 12:02:52,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 416 states, 411 states have (on average 1.0121654501216546) internal successors, (416), 411 states have internal predecessors, (416), 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 12:02:52,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 416 states to 416 states and 420 transitions. [2021-05-06 12:02:52,702 INFO L78 Accepts]: Start accepts. Automaton has 416 states and 420 transitions. Word has length 238 [2021-05-06 12:02:52,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:02:52,702 INFO L480 AbstractCegarLoop]: Abstraction has 416 states and 420 transitions. [2021-05-06 12:02:52,702 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 142 states, 142 states have (on average 1.647887323943662) internal successors, (234), 141 states have internal predecessors, (234), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:52,716 INFO L276 IsEmpty]: Start isEmpty. Operand 416 states and 420 transitions. [2021-05-06 12:02:52,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 242 [2021-05-06 12:02:52,718 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:02:52,718 INFO L523 BasicCegarLoop]: trace histogram [90, 89, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:02:52,718 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable146 [2021-05-06 12:02:52,718 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:02:52,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:02:52,718 INFO L82 PathProgramCache]: Analyzing trace with hash 874896140, now seen corresponding path program 49 times [2021-05-06 12:02:52,718 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:02:52,718 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1359045533] [2021-05-06 12:02:52,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:02:52,725 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:52,726 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:52,756 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:52,763 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:52,764 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:52,781 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:52,793 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:52,795 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:02:52,800 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:52,803 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:52,806 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:02:52,811 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:52,812 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:52,815 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:02:52,816 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:52,826 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:52,833 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:02:52,838 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:52,841 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:52,852 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:52,854 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:52,860 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:52,862 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:52,868 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:52,878 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:52,879 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:52,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:53,663 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:02:53,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:53,694 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 12:02:53,695 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:53,696 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:56,490 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:02:56,490 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1359045533] [2021-05-06 12:02:56,490 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1359045533] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:02:56,490 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:02:56,490 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [144] imperfect sequences [] total 144 [2021-05-06 12:02:56,490 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418500485] [2021-05-06 12:02:56,491 INFO L460 AbstractCegarLoop]: Interpolant automaton has 144 states [2021-05-06 12:02:56,491 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:02:56,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 144 interpolants. [2021-05-06 12:02:56,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6150, Invalid=14442, Unknown=0, NotChecked=0, Total=20592 [2021-05-06 12:02:56,492 INFO L87 Difference]: Start difference. First operand 416 states and 420 transitions. Second operand has 144 states, 144 states have (on average 1.6458333333333333) internal successors, (237), 143 states have internal predecessors, (237), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:12,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:12,475 INFO L93 Difference]: Finished difference Result 655 states and 671 transitions. [2021-05-06 12:03:12,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2021-05-06 12:03:12,475 INFO L78 Accepts]: Start accepts. Automaton has has 144 states, 144 states have (on average 1.6458333333333333) internal successors, (237), 143 states have internal predecessors, (237), 2 states have call successors, (3), 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 241 [2021-05-06 12:03:12,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:12,477 INFO L225 Difference]: With dead ends: 655 [2021-05-06 12:03:12,477 INFO L226 Difference]: Without dead ends: 425 [2021-05-06 12:03:12,480 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 283 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23386 ImplicationChecksByTransitivity, 13124.4ms TimeCoverageRelationStatistics Valid=18444, Invalid=62496, Unknown=0, NotChecked=0, Total=80940 [2021-05-06 12:03:12,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 425 states. [2021-05-06 12:03:12,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 425 to 247. [2021-05-06 12:03:12,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 247 states, 242 states have (on average 1.0165289256198347) internal successors, (246), 242 states have internal predecessors, (246), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:12,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 250 transitions. [2021-05-06 12:03:12,494 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 250 transitions. Word has length 241 [2021-05-06 12:03:12,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:12,495 INFO L480 AbstractCegarLoop]: Abstraction has 247 states and 250 transitions. [2021-05-06 12:03:12,495 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 144 states, 144 states have (on average 1.6458333333333333) internal successors, (237), 143 states have internal predecessors, (237), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:12,495 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 250 transitions. [2021-05-06 12:03:12,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2021-05-06 12:03:12,495 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:12,496 INFO L523 BasicCegarLoop]: trace histogram [92, 91, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:12,496 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable149 [2021-05-06 12:03:12,496 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:12,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:12,496 INFO L82 PathProgramCache]: Analyzing trace with hash -1569773279, now seen corresponding path program 50 times [2021-05-06 12:03:12,496 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:12,496 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [419730275] [2021-05-06 12:03:12,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:12,505 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:03:12,518 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:12,520 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:12,528 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:12,530 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:12,546 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:03:12,558 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:12,561 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:03:12,566 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:12,569 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:12,573 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:03:12,579 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:12,580 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:12,582 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:03:12,582 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:12,585 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:12,594 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:03:12,600 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:12,603 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:03:12,625 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:12,629 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:12,637 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:12,639 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:12,647 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:03:12,659 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:12,660 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:12,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:13,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:13,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:13,618 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 12:03:13,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:13,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:17,621 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:17,622 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [419730275] [2021-05-06 12:03:17,622 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [419730275] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:17,622 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:17,622 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [147] imperfect sequences [] total 147 [2021-05-06 12:03:17,622 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1501616381] [2021-05-06 12:03:17,622 INFO L460 AbstractCegarLoop]: Interpolant automaton has 147 states [2021-05-06 12:03:17,622 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:17,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 147 interpolants. [2021-05-06 12:03:17,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6401, Invalid=15061, Unknown=0, NotChecked=0, Total=21462 [2021-05-06 12:03:17,624 INFO L87 Difference]: Start difference. First operand 247 states and 250 transitions. Second operand has 147 states, 147 states have (on average 1.6462585034013606) internal successors, (242), 146 states have internal predecessors, (242), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:33,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:33,276 INFO L93 Difference]: Finished difference Result 491 states and 502 transitions. [2021-05-06 12:03:33,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 147 states. [2021-05-06 12:03:33,276 INFO L78 Accepts]: Start accepts. Automaton has has 147 states, 147 states have (on average 1.6462585034013606) internal successors, (242), 146 states have internal predecessors, (242), 2 states have call successors, (3), 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 246 [2021-05-06 12:03:33,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:33,277 INFO L225 Difference]: With dead ends: 491 [2021-05-06 12:03:33,277 INFO L226 Difference]: Without dead ends: 252 [2021-05-06 12:03:33,280 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 389 GetRequests, 99 SyntacticMatches, 1 SemanticMatches, 289 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24438 ImplicationChecksByTransitivity, 14482.8ms TimeCoverageRelationStatistics Valid=19197, Invalid=65193, Unknown=0, NotChecked=0, Total=84390 [2021-05-06 12:03:33,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2021-05-06 12:03:33,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 252. [2021-05-06 12:03:33,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 247 states have (on average 1.0161943319838056) internal successors, (251), 247 states have internal predecessors, (251), 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 12:03:33,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 255 transitions. [2021-05-06 12:03:33,291 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 255 transitions. Word has length 246 [2021-05-06 12:03:33,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:33,292 INFO L480 AbstractCegarLoop]: Abstraction has 252 states and 255 transitions. [2021-05-06 12:03:33,292 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 147 states, 147 states have (on average 1.6462585034013606) internal successors, (242), 146 states have internal predecessors, (242), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:33,292 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 255 transitions. [2021-05-06 12:03:33,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 252 [2021-05-06 12:03:33,293 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:33,293 INFO L523 BasicCegarLoop]: trace histogram [94, 93, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:33,293 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable152 [2021-05-06 12:03:33,293 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:33,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:33,293 INFO L82 PathProgramCache]: Analyzing trace with hash -1788682920, now seen corresponding path program 51 times [2021-05-06 12:03:33,293 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:33,293 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [707398902] [2021-05-06 12:03:33,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:33,299 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:03:33,299 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:33,300 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:33,307 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:33,309 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:33,327 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:03:33,341 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:33,343 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:03:33,349 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:33,352 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:33,356 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:03:33,364 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:33,364 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:33,366 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:03:33,366 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:33,370 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:33,378 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:03:33,386 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:33,389 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:03:33,402 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:33,403 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:33,410 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:33,412 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:33,420 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:03:33,435 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:33,436 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:33,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:34,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:34,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:34,470 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 12:03:34,471 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:34,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:38,774 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:38,774 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [707398902] [2021-05-06 12:03:38,774 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [707398902] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:38,774 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:38,774 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [150] imperfect sequences [] total 150 [2021-05-06 12:03:38,774 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451478343] [2021-05-06 12:03:38,774 INFO L460 AbstractCegarLoop]: Interpolant automaton has 150 states [2021-05-06 12:03:38,774 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:38,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 150 interpolants. [2021-05-06 12:03:38,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6657, Invalid=15693, Unknown=0, NotChecked=0, Total=22350 [2021-05-06 12:03:38,776 INFO L87 Difference]: Start difference. First operand 252 states and 255 transitions. Second operand has 150 states, 150 states have (on average 1.6466666666666667) internal successors, (247), 149 states have internal predecessors, (247), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:56,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:56,131 INFO L93 Difference]: Finished difference Result 501 states and 512 transitions. [2021-05-06 12:03:56,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 150 states. [2021-05-06 12:03:56,132 INFO L78 Accepts]: Start accepts. Automaton has has 150 states, 150 states have (on average 1.6466666666666667) internal successors, (247), 149 states have internal predecessors, (247), 2 states have call successors, (3), 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 251 [2021-05-06 12:03:56,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:56,133 INFO L225 Difference]: With dead ends: 501 [2021-05-06 12:03:56,133 INFO L226 Difference]: Without dead ends: 257 [2021-05-06 12:03:56,136 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 397 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 295 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25411 ImplicationChecksByTransitivity, 15736.1ms TimeCoverageRelationStatistics Valid=19965, Invalid=67947, Unknown=0, NotChecked=0, Total=87912 [2021-05-06 12:03:56,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2021-05-06 12:03:56,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 257. [2021-05-06 12:03:56,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 252 states have (on average 1.0158730158730158) internal successors, (256), 252 states have internal predecessors, (256), 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 12:03:56,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 260 transitions. [2021-05-06 12:03:56,148 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 260 transitions. Word has length 251 [2021-05-06 12:03:56,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:56,149 INFO L480 AbstractCegarLoop]: Abstraction has 257 states and 260 transitions. [2021-05-06 12:03:56,149 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 150 states, 150 states have (on average 1.6466666666666667) internal successors, (247), 149 states have internal predecessors, (247), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:56,149 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 260 transitions. [2021-05-06 12:03:56,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 257 [2021-05-06 12:03:56,150 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:56,150 INFO L523 BasicCegarLoop]: trace histogram [96, 95, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:56,150 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable155 [2021-05-06 12:03:56,150 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:56,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:56,150 INFO L82 PathProgramCache]: Analyzing trace with hash 595811285, now seen corresponding path program 52 times [2021-05-06 12:03:56,150 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:56,150 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [941126747] [2021-05-06 12:03:56,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:56,156 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:03:56,168 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:56,169 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:56,177 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:56,178 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:56,186 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:03:56,199 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:56,202 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:03:56,207 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:56,211 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:56,215 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:03:56,222 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:56,223 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:56,224 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:03:56,230 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:56,234 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:56,238 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:03:56,246 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:56,249 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:03:56,249 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:56,250 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:56,258 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:56,260 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:56,284 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:03:56,301 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:56,302 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:56,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:57,415 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:57,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:57,420 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 12:03:57,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:57,421 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:01,793 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:01,793 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [941126747] [2021-05-06 12:04:01,793 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [941126747] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:01,793 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:01,793 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [153] imperfect sequences [] total 153 [2021-05-06 12:04:01,793 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850124958] [2021-05-06 12:04:01,793 INFO L460 AbstractCegarLoop]: Interpolant automaton has 153 states [2021-05-06 12:04:01,793 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:01,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 153 interpolants. [2021-05-06 12:04:01,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6918, Invalid=16338, Unknown=0, NotChecked=0, Total=23256 [2021-05-06 12:04:01,795 INFO L87 Difference]: Start difference. First operand 257 states and 260 transitions. Second operand has 153 states, 153 states have (on average 1.6470588235294117) internal successors, (252), 152 states have internal predecessors, (252), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:19,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:19,949 INFO L93 Difference]: Finished difference Result 511 states and 522 transitions. [2021-05-06 12:04:19,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 153 states. [2021-05-06 12:04:19,949 INFO L78 Accepts]: Start accepts. Automaton has has 153 states, 153 states have (on average 1.6470588235294117) internal successors, (252), 152 states have internal predecessors, (252), 2 states have call successors, (3), 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 256 [2021-05-06 12:04:19,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:19,950 INFO L225 Difference]: With dead ends: 511 [2021-05-06 12:04:19,950 INFO L226 Difference]: Without dead ends: 262 [2021-05-06 12:04:19,953 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 301 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26455 ImplicationChecksByTransitivity, 16318.4ms TimeCoverageRelationStatistics Valid=20748, Invalid=70758, Unknown=0, NotChecked=0, Total=91506 [2021-05-06 12:04:19,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2021-05-06 12:04:19,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 262. [2021-05-06 12:04:19,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 257 states have (on average 1.0155642023346303) internal successors, (261), 257 states have internal predecessors, (261), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:19,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 265 transitions. [2021-05-06 12:04:19,965 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 265 transitions. Word has length 256 [2021-05-06 12:04:19,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:19,966 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 265 transitions. [2021-05-06 12:04:19,966 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 153 states, 153 states have (on average 1.6470588235294117) internal successors, (252), 152 states have internal predecessors, (252), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:19,966 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 265 transitions. [2021-05-06 12:04:19,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2021-05-06 12:04:19,967 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:19,967 INFO L523 BasicCegarLoop]: trace histogram [98, 97, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:19,967 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable158 [2021-05-06 12:04:19,967 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:19,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:19,967 INFO L82 PathProgramCache]: Analyzing trace with hash -2023012956, now seen corresponding path program 53 times [2021-05-06 12:04:19,967 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:19,967 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [387242458] [2021-05-06 12:04:19,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:19,973 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:04:19,973 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:19,974 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:19,980 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:19,982 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:19,998 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:04:20,011 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:20,014 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:04:20,020 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:20,024 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:20,027 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:04:20,034 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:20,035 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:20,036 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:04:20,037 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:20,040 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:20,049 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:04:20,056 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:20,059 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:04:20,059 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:20,060 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:20,068 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:20,070 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:20,088 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:04:20,103 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:20,104 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:20,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:21,298 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:21,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:21,300 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 12:04:21,301 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:21,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:25,840 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:25,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [387242458] [2021-05-06 12:04:25,841 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [387242458] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:25,841 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:25,841 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [156] imperfect sequences [] total 156 [2021-05-06 12:04:25,841 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203748117] [2021-05-06 12:04:25,841 INFO L460 AbstractCegarLoop]: Interpolant automaton has 156 states [2021-05-06 12:04:25,841 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:25,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 156 interpolants. [2021-05-06 12:04:25,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7184, Invalid=16996, Unknown=0, NotChecked=0, Total=24180 [2021-05-06 12:04:25,843 INFO L87 Difference]: Start difference. First operand 262 states and 265 transitions. Second operand has 156 states, 156 states have (on average 1.6474358974358974) internal successors, (257), 155 states have internal predecessors, (257), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:44,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:44,212 INFO L93 Difference]: Finished difference Result 521 states and 532 transitions. [2021-05-06 12:04:44,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 156 states. [2021-05-06 12:04:44,212 INFO L78 Accepts]: Start accepts. Automaton has has 156 states, 156 states have (on average 1.6474358974358974) internal successors, (257), 155 states have internal predecessors, (257), 2 states have call successors, (3), 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 261 [2021-05-06 12:04:44,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:44,213 INFO L225 Difference]: With dead ends: 521 [2021-05-06 12:04:44,213 INFO L226 Difference]: Without dead ends: 267 [2021-05-06 12:04:44,216 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 413 GetRequests, 105 SyntacticMatches, 1 SemanticMatches, 307 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27573 ImplicationChecksByTransitivity, 16809.1ms TimeCoverageRelationStatistics Valid=21546, Invalid=73626, Unknown=0, NotChecked=0, Total=95172 [2021-05-06 12:04:44,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2021-05-06 12:04:44,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 267. [2021-05-06 12:04:44,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 267 states, 262 states have (on average 1.015267175572519) internal successors, (266), 262 states have internal predecessors, (266), 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 12:04:44,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 270 transitions. [2021-05-06 12:04:44,228 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 270 transitions. Word has length 261 [2021-05-06 12:04:44,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:44,228 INFO L480 AbstractCegarLoop]: Abstraction has 267 states and 270 transitions. [2021-05-06 12:04:44,228 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 156 states, 156 states have (on average 1.6474358974358974) internal successors, (257), 155 states have internal predecessors, (257), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:44,228 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 270 transitions. [2021-05-06 12:04:44,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 267 [2021-05-06 12:04:44,229 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:44,229 INFO L523 BasicCegarLoop]: trace histogram [100, 99, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:44,229 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable161 [2021-05-06 12:04:44,229 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:44,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:44,229 INFO L82 PathProgramCache]: Analyzing trace with hash -207058807, now seen corresponding path program 54 times [2021-05-06 12:04:44,229 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:44,229 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1775962015] [2021-05-06 12:04:44,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:44,238 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:04:44,248 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:44,249 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:44,254 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:44,255 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:44,260 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:04:44,269 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:44,271 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:04:44,271 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:44,273 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:44,279 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:04:44,283 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:44,284 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:44,285 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:04:44,285 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:44,287 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:44,293 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:04:44,297 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:44,306 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:04:44,316 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:44,317 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:44,322 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:44,323 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:44,329 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:04:44,338 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:44,338 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:44,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:45,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:45,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:45,128 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 12:04:45,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:45,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:49,580 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:49,580 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1775962015] [2021-05-06 12:04:49,580 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1775962015] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:49,580 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:49,581 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [159] imperfect sequences [] total 159 [2021-05-06 12:04:49,581 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1550054490] [2021-05-06 12:04:49,581 INFO L460 AbstractCegarLoop]: Interpolant automaton has 159 states [2021-05-06 12:04:49,581 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:49,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 159 interpolants. [2021-05-06 12:04:49,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7455, Invalid=17667, Unknown=0, NotChecked=0, Total=25122 [2021-05-06 12:04:49,583 INFO L87 Difference]: Start difference. First operand 267 states and 270 transitions. Second operand has 159 states, 159 states have (on average 1.6477987421383649) internal successors, (262), 158 states have internal predecessors, (262), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:09,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:09,265 INFO L93 Difference]: Finished difference Result 531 states and 542 transitions. [2021-05-06 12:05:09,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 159 states. [2021-05-06 12:05:09,265 INFO L78 Accepts]: Start accepts. Automaton has has 159 states, 159 states have (on average 1.6477987421383649) internal successors, (262), 158 states have internal predecessors, (262), 2 states have call successors, (3), 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 266 [2021-05-06 12:05:09,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:09,266 INFO L225 Difference]: With dead ends: 531 [2021-05-06 12:05:09,266 INFO L226 Difference]: Without dead ends: 272 [2021-05-06 12:05:09,270 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 421 GetRequests, 107 SyntacticMatches, 1 SemanticMatches, 313 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28660 ImplicationChecksByTransitivity, 17063.4ms TimeCoverageRelationStatistics Valid=22359, Invalid=76551, Unknown=0, NotChecked=0, Total=98910 [2021-05-06 12:05:09,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2021-05-06 12:05:09,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 272. [2021-05-06 12:05:09,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 272 states, 267 states have (on average 1.0149812734082397) internal successors, (271), 267 states have internal predecessors, (271), 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 12:05:09,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 275 transitions. [2021-05-06 12:05:09,284 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 275 transitions. Word has length 266 [2021-05-06 12:05:09,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:09,285 INFO L480 AbstractCegarLoop]: Abstraction has 272 states and 275 transitions. [2021-05-06 12:05:09,285 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 159 states, 159 states have (on average 1.6477987421383649) internal successors, (262), 158 states have internal predecessors, (262), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:09,285 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 275 transitions. [2021-05-06 12:05:09,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 272 [2021-05-06 12:05:09,286 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:09,286 INFO L523 BasicCegarLoop]: trace histogram [102, 101, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:09,286 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable164 [2021-05-06 12:05:09,286 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:09,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:09,286 INFO L82 PathProgramCache]: Analyzing trace with hash -86617104, now seen corresponding path program 55 times [2021-05-06 12:05:09,286 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:09,286 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1241967986] [2021-05-06 12:05:09,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:09,294 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:05:09,313 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:09,315 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:09,323 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:09,325 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:09,332 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:05:09,346 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:09,349 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:05:09,349 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:09,353 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:09,362 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:05:09,369 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:09,370 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:09,390 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:05:09,391 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:09,395 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:09,405 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:05:09,414 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:09,418 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:05:09,435 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:09,436 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:09,445 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:09,447 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:09,457 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:05:09,472 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:09,473 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:09,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:10,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:10,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:10,815 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 12:05:10,816 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:10,817 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:16,032 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:16,032 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1241967986] [2021-05-06 12:05:16,032 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1241967986] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:16,032 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:16,032 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [162] imperfect sequences [] total 162 [2021-05-06 12:05:16,032 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854580850] [2021-05-06 12:05:16,032 INFO L460 AbstractCegarLoop]: Interpolant automaton has 162 states [2021-05-06 12:05:16,033 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:16,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 162 interpolants. [2021-05-06 12:05:16,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7731, Invalid=18351, Unknown=0, NotChecked=0, Total=26082 [2021-05-06 12:05:16,034 INFO L87 Difference]: Start difference. First operand 272 states and 275 transitions. Second operand has 162 states, 162 states have (on average 1.6481481481481481) internal successors, (267), 161 states have internal predecessors, (267), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:37,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:37,174 INFO L93 Difference]: Finished difference Result 541 states and 552 transitions. [2021-05-06 12:05:37,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 162 states. [2021-05-06 12:05:37,174 INFO L78 Accepts]: Start accepts. Automaton has has 162 states, 162 states have (on average 1.6481481481481481) internal successors, (267), 161 states have internal predecessors, (267), 2 states have call successors, (3), 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 271 [2021-05-06 12:05:37,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:37,175 INFO L225 Difference]: With dead ends: 541 [2021-05-06 12:05:37,175 INFO L226 Difference]: Without dead ends: 277 [2021-05-06 12:05:37,180 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 429 GetRequests, 109 SyntacticMatches, 1 SemanticMatches, 319 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29768 ImplicationChecksByTransitivity, 19189.7ms TimeCoverageRelationStatistics Valid=23187, Invalid=79533, Unknown=0, NotChecked=0, Total=102720 [2021-05-06 12:05:37,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2021-05-06 12:05:37,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 277. [2021-05-06 12:05:37,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 277 states, 272 states have (on average 1.0147058823529411) internal successors, (276), 272 states have internal predecessors, (276), 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 12:05:37,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 280 transitions. [2021-05-06 12:05:37,198 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 280 transitions. Word has length 271 [2021-05-06 12:05:37,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:37,198 INFO L480 AbstractCegarLoop]: Abstraction has 277 states and 280 transitions. [2021-05-06 12:05:37,198 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 162 states, 162 states have (on average 1.6481481481481481) internal successors, (267), 161 states have internal predecessors, (267), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:37,198 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 280 transitions. [2021-05-06 12:05:37,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2021-05-06 12:05:37,199 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:37,200 INFO L523 BasicCegarLoop]: trace histogram [104, 103, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:37,200 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable167 [2021-05-06 12:05:37,200 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:37,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:37,200 INFO L82 PathProgramCache]: Analyzing trace with hash 640118589, now seen corresponding path program 56 times [2021-05-06 12:05:37,200 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:37,200 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1817138378] [2021-05-06 12:05:37,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:37,207 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:05:37,208 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:37,209 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:37,217 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:37,219 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:37,238 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:05:37,251 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:37,254 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:05:37,260 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:37,263 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:37,267 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:05:37,275 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:37,276 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:37,277 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:05:37,283 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:37,287 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:37,291 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:05:37,299 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:37,303 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:05:37,318 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:37,319 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:37,326 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:37,328 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:37,336 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:05:37,353 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:37,354 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:37,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:38,742 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:38,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:38,745 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 12:05:38,746 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:38,747 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:44,118 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:44,119 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1817138378] [2021-05-06 12:05:44,119 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1817138378] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:44,119 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:44,119 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [165] imperfect sequences [] total 165 [2021-05-06 12:05:44,119 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883011706] [2021-05-06 12:05:44,119 INFO L460 AbstractCegarLoop]: Interpolant automaton has 165 states [2021-05-06 12:05:44,119 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:44,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 165 interpolants. [2021-05-06 12:05:44,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8012, Invalid=19048, Unknown=0, NotChecked=0, Total=27060 [2021-05-06 12:05:44,121 INFO L87 Difference]: Start difference. First operand 277 states and 280 transitions. Second operand has 165 states, 165 states have (on average 1.6484848484848484) internal successors, (272), 164 states have internal predecessors, (272), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:06,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:06,450 INFO L93 Difference]: Finished difference Result 551 states and 562 transitions. [2021-05-06 12:06:06,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 165 states. [2021-05-06 12:06:06,451 INFO L78 Accepts]: Start accepts. Automaton has has 165 states, 165 states have (on average 1.6484848484848484) internal successors, (272), 164 states have internal predecessors, (272), 2 states have call successors, (3), 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 276 [2021-05-06 12:06:06,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:06,452 INFO L225 Difference]: With dead ends: 551 [2021-05-06 12:06:06,452 INFO L226 Difference]: Without dead ends: 282 [2021-05-06 12:06:06,456 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 111 SyntacticMatches, 1 SemanticMatches, 325 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30897 ImplicationChecksByTransitivity, 19802.0ms TimeCoverageRelationStatistics Valid=24030, Invalid=82572, Unknown=0, NotChecked=0, Total=106602 [2021-05-06 12:06:06,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2021-05-06 12:06:06,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 282. [2021-05-06 12:06:06,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 282 states, 277 states have (on average 1.0144404332129964) internal successors, (281), 277 states have internal predecessors, (281), 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 12:06:06,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 285 transitions. [2021-05-06 12:06:06,474 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 285 transitions. Word has length 276 [2021-05-06 12:06:06,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:06,474 INFO L480 AbstractCegarLoop]: Abstraction has 282 states and 285 transitions. [2021-05-06 12:06:06,474 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 165 states, 165 states have (on average 1.6484848484848484) internal successors, (272), 164 states have internal predecessors, (272), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:06,474 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 285 transitions. [2021-05-06 12:06:06,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 282 [2021-05-06 12:06:06,475 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:06,476 INFO L523 BasicCegarLoop]: trace histogram [106, 105, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:06,476 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable170 [2021-05-06 12:06:06,476 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:06,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:06,476 INFO L82 PathProgramCache]: Analyzing trace with hash 796608572, now seen corresponding path program 57 times [2021-05-06 12:06:06,476 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:06,476 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1600434664] [2021-05-06 12:06:06,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:06,483 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:06:06,498 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:06,499 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:06,507 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:06,509 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:06,518 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:06:06,536 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:06,539 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:06:06,546 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:06,551 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:06,555 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:06:06,563 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:06,564 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:06,566 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:06:06,572 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:06,576 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:06,580 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:06:06,588 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:06,591 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:06:06,607 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:06,609 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:06,618 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:06,620 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:06,631 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:06:06,648 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:06,649 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:06,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:08,044 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:08,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:08,046 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 12:06:08,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:08,048 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:13,555 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:13,555 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1600434664] [2021-05-06 12:06:13,555 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1600434664] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:13,555 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:13,555 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [168] imperfect sequences [] total 168 [2021-05-06 12:06:13,555 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080242077] [2021-05-06 12:06:13,555 INFO L460 AbstractCegarLoop]: Interpolant automaton has 168 states [2021-05-06 12:06:13,555 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:13,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 168 interpolants. [2021-05-06 12:06:13,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8298, Invalid=19758, Unknown=0, NotChecked=0, Total=28056 [2021-05-06 12:06:13,557 INFO L87 Difference]: Start difference. First operand 282 states and 285 transitions. Second operand has 168 states, 168 states have (on average 1.6488095238095237) internal successors, (277), 167 states have internal predecessors, (277), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:35,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:35,627 INFO L93 Difference]: Finished difference Result 561 states and 572 transitions. [2021-05-06 12:06:35,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 168 states. [2021-05-06 12:06:35,627 INFO L78 Accepts]: Start accepts. Automaton has has 168 states, 168 states have (on average 1.6488095238095237) internal successors, (277), 167 states have internal predecessors, (277), 2 states have call successors, (3), 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 281 [2021-05-06 12:06:35,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:35,628 INFO L225 Difference]: With dead ends: 561 [2021-05-06 12:06:35,628 INFO L226 Difference]: Without dead ends: 287 [2021-05-06 12:06:35,632 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 113 SyntacticMatches, 1 SemanticMatches, 331 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32047 ImplicationChecksByTransitivity, 20043.1ms TimeCoverageRelationStatistics Valid=24888, Invalid=85668, Unknown=0, NotChecked=0, Total=110556 [2021-05-06 12:06:35,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2021-05-06 12:06:35,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 287. [2021-05-06 12:06:35,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 287 states, 282 states have (on average 1.0141843971631206) internal successors, (286), 282 states have internal predecessors, (286), 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 12:06:35,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 290 transitions. [2021-05-06 12:06:35,646 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 290 transitions. Word has length 281 [2021-05-06 12:06:35,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:35,646 INFO L480 AbstractCegarLoop]: Abstraction has 287 states and 290 transitions. [2021-05-06 12:06:35,646 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 168 states, 168 states have (on average 1.6488095238095237) internal successors, (277), 167 states have internal predecessors, (277), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:35,646 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 290 transitions. [2021-05-06 12:06:35,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2021-05-06 12:06:35,647 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:35,647 INFO L523 BasicCegarLoop]: trace histogram [108, 107, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:35,647 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable173 [2021-05-06 12:06:35,647 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:35,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:35,647 INFO L82 PathProgramCache]: Analyzing trace with hash -1861693455, now seen corresponding path program 58 times [2021-05-06 12:06:35,647 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:35,647 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1334272788] [2021-05-06 12:06:35,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:35,653 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:06:35,664 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:35,665 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:35,669 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:35,671 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:35,676 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:06:35,685 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:35,686 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:06:35,687 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:35,689 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:35,695 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:06:35,700 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:35,700 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:35,702 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:06:35,702 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:35,704 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:35,710 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:06:35,714 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:35,716 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:06:35,726 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:35,727 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:35,732 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:35,734 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:35,739 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:06:35,748 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:35,749 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:35,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:36,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:36,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:36,661 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 12:06:36,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:36,662 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:41,705 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:41,705 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1334272788] [2021-05-06 12:06:41,705 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1334272788] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:41,705 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:41,705 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [171] imperfect sequences [] total 171 [2021-05-06 12:06:41,705 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30324295] [2021-05-06 12:06:41,705 INFO L460 AbstractCegarLoop]: Interpolant automaton has 171 states [2021-05-06 12:06:41,705 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:41,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 171 interpolants. [2021-05-06 12:06:41,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8589, Invalid=20481, Unknown=0, NotChecked=0, Total=29070 [2021-05-06 12:06:41,707 INFO L87 Difference]: Start difference. First operand 287 states and 290 transitions. Second operand has 171 states, 171 states have (on average 1.6491228070175439) internal successors, (282), 170 states have internal predecessors, (282), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:04,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:04,045 INFO L93 Difference]: Finished difference Result 571 states and 582 transitions. [2021-05-06 12:07:04,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 171 states. [2021-05-06 12:07:04,045 INFO L78 Accepts]: Start accepts. Automaton has has 171 states, 171 states have (on average 1.6491228070175439) internal successors, (282), 170 states have internal predecessors, (282), 2 states have call successors, (3), 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 286 [2021-05-06 12:07:04,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:04,046 INFO L225 Difference]: With dead ends: 571 [2021-05-06 12:07:04,046 INFO L226 Difference]: Without dead ends: 292 [2021-05-06 12:07:04,050 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 337 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33160 ImplicationChecksByTransitivity, 19083.9ms TimeCoverageRelationStatistics Valid=25761, Invalid=88821, Unknown=0, NotChecked=0, Total=114582 [2021-05-06 12:07:04,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2021-05-06 12:07:04,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 292. [2021-05-06 12:07:04,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 287 states have (on average 1.0139372822299653) internal successors, (291), 287 states have internal predecessors, (291), 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 12:07:04,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 295 transitions. [2021-05-06 12:07:04,063 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 295 transitions. Word has length 286 [2021-05-06 12:07:04,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:04,063 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 295 transitions. [2021-05-06 12:07:04,063 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 171 states, 171 states have (on average 1.6491228070175439) internal successors, (282), 170 states have internal predecessors, (282), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:04,063 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 295 transitions. [2021-05-06 12:07:04,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 292 [2021-05-06 12:07:04,064 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:04,064 INFO L523 BasicCegarLoop]: trace histogram [110, 109, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:04,064 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable176 [2021-05-06 12:07:04,064 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:04,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:04,064 INFO L82 PathProgramCache]: Analyzing trace with hash 275866248, now seen corresponding path program 59 times [2021-05-06 12:07:04,065 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:04,065 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1763870162] [2021-05-06 12:07:04,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:04,070 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:07:04,081 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:04,082 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:04,089 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:04,090 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:04,098 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:07:04,112 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:04,114 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:07:04,115 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:04,118 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:07:04,127 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:07:04,134 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:04,135 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:04,136 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:07:04,142 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:04,146 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:07:04,150 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:07:04,157 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:04,160 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:07:04,161 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:04,162 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:04,169 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:04,171 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:04,192 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:07:04,210 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:04,211 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:04,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:05,628 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:05,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:05,631 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 12:07:05,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:05,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:11,365 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:11,365 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1763870162] [2021-05-06 12:07:11,365 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1763870162] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:11,365 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:11,365 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [174] imperfect sequences [] total 174 [2021-05-06 12:07:11,365 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1298285968] [2021-05-06 12:07:11,366 INFO L460 AbstractCegarLoop]: Interpolant automaton has 174 states [2021-05-06 12:07:11,366 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:11,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 174 interpolants. [2021-05-06 12:07:11,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8885, Invalid=21217, Unknown=0, NotChecked=0, Total=30102 [2021-05-06 12:07:11,368 INFO L87 Difference]: Start difference. First operand 292 states and 295 transitions. Second operand has 174 states, 174 states have (on average 1.6494252873563218) internal successors, (287), 173 states have internal predecessors, (287), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:34,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:34,903 INFO L93 Difference]: Finished difference Result 581 states and 592 transitions. [2021-05-06 12:07:34,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 174 states. [2021-05-06 12:07:34,904 INFO L78 Accepts]: Start accepts. Automaton has has 174 states, 174 states have (on average 1.6494252873563218) internal successors, (287), 173 states have internal predecessors, (287), 2 states have call successors, (3), 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 291 [2021-05-06 12:07:34,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:34,904 INFO L225 Difference]: With dead ends: 581 [2021-05-06 12:07:34,904 INFO L226 Difference]: Without dead ends: 297 [2021-05-06 12:07:34,908 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 461 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 343 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34351 ImplicationChecksByTransitivity, 21142.5ms TimeCoverageRelationStatistics Valid=26649, Invalid=92031, Unknown=0, NotChecked=0, Total=118680 [2021-05-06 12:07:34,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2021-05-06 12:07:34,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 297. [2021-05-06 12:07:34,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 297 states, 292 states have (on average 1.0136986301369864) internal successors, (296), 292 states have internal predecessors, (296), 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 12:07:34,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 300 transitions. [2021-05-06 12:07:34,922 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 300 transitions. Word has length 291 [2021-05-06 12:07:34,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:34,922 INFO L480 AbstractCegarLoop]: Abstraction has 297 states and 300 transitions. [2021-05-06 12:07:34,922 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 174 states, 174 states have (on average 1.6494252873563218) internal successors, (287), 173 states have internal predecessors, (287), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:34,922 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 300 transitions. [2021-05-06 12:07:34,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2021-05-06 12:07:34,923 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:34,923 INFO L523 BasicCegarLoop]: trace histogram [112, 111, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:34,923 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable179 [2021-05-06 12:07:34,923 INFO L428 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:34,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:34,923 INFO L82 PathProgramCache]: Analyzing trace with hash 1897228965, now seen corresponding path program 60 times [2021-05-06 12:07:34,923 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:34,924 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1121009416] [2021-05-06 12:07:34,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:34,947 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:07:34,948 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:34,949 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:34,956 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:34,958 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:34,984 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:07:34,997 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:35,000 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:07:35,005 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:35,008 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:07:35,012 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:07:35,020 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:35,021 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:35,022 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:07:35,023 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:35,026 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:07:35,035 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:07:35,043 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:35,046 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:07:35,046 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:35,047 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:35,055 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:35,057 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:35,075 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:07:35,090 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:35,091 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:35,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:36,566 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:36,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:36,569 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:36,569 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:36,570 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:41,688 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:41,689 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1121009416] [2021-05-06 12:07:41,689 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1121009416] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:41,689 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:41,689 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [177] imperfect sequences [] total 177 [2021-05-06 12:07:41,689 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340618266] [2021-05-06 12:07:41,689 INFO L460 AbstractCegarLoop]: Interpolant automaton has 177 states [2021-05-06 12:07:41,689 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:41,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 177 interpolants. [2021-05-06 12:07:41,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9186, Invalid=21966, Unknown=0, NotChecked=0, Total=31152 [2021-05-06 12:07:41,691 INFO L87 Difference]: Start difference. First operand 297 states and 300 transitions. Second operand has 177 states, 177 states have (on average 1.6497175141242937) internal successors, (292), 176 states have internal predecessors, (292), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:08:04,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:04,442 INFO L93 Difference]: Finished difference Result 591 states and 602 transitions. [2021-05-06 12:08:04,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 177 states. [2021-05-06 12:08:04,443 INFO L78 Accepts]: Start accepts. Automaton has has 177 states, 177 states have (on average 1.6497175141242937) internal successors, (292), 176 states have internal predecessors, (292), 2 states have call successors, (3), 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 296 [2021-05-06 12:08:04,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:04,444 INFO L225 Difference]: With dead ends: 591 [2021-05-06 12:08:04,444 INFO L226 Difference]: Without dead ends: 302 [2021-05-06 12:08:04,447 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 469 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 349 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35563 ImplicationChecksByTransitivity, 20305.4ms TimeCoverageRelationStatistics Valid=27552, Invalid=95298, Unknown=0, NotChecked=0, Total=122850 [2021-05-06 12:08:04,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2021-05-06 12:08:04,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 302. [2021-05-06 12:08:04,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 302 states, 297 states have (on average 1.0134680134680134) internal successors, (301), 297 states have internal predecessors, (301), 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 12:08:04,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 305 transitions. [2021-05-06 12:08:04,462 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 305 transitions. Word has length 296 [2021-05-06 12:08:04,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:04,462 INFO L480 AbstractCegarLoop]: Abstraction has 302 states and 305 transitions. [2021-05-06 12:08:04,463 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 177 states, 177 states have (on average 1.6497175141242937) internal successors, (292), 176 states have internal predecessors, (292), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:08:04,463 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 305 transitions. [2021-05-06 12:08:04,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 302 [2021-05-06 12:08:04,464 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:04,464 INFO L523 BasicCegarLoop]: trace histogram [114, 113, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:04,464 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable182 [2021-05-06 12:08:04,464 INFO L428 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:04,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:04,464 INFO L82 PathProgramCache]: Analyzing trace with hash -1878007084, now seen corresponding path program 61 times [2021-05-06 12:08:04,465 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:04,465 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1933673612] [2021-05-06 12:08:04,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:04,483 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:08:04,496 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:04,497 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:04,505 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:04,507 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:04,514 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:08:04,537 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:04,539 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:08:04,540 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:04,543 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:08:04,551 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:08:04,558 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:04,559 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:04,562 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:08:04,562 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:04,569 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:08:04,577 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:08:04,583 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:04,586 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:08:04,599 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:04,601 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:04,609 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:04,611 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:04,619 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:08:04,632 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:04,633 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:04,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:06,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:06,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:06,086 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 12:08:06,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:06,088 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:12,031 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:12,031 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1933673612] [2021-05-06 12:08:12,031 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1933673612] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:12,031 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:12,031 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [180] imperfect sequences [] total 180 [2021-05-06 12:08:12,031 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910531999] [2021-05-06 12:08:12,032 INFO L460 AbstractCegarLoop]: Interpolant automaton has 180 states [2021-05-06 12:08:12,032 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:12,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 180 interpolants. [2021-05-06 12:08:12,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9492, Invalid=22728, Unknown=0, NotChecked=0, Total=32220 [2021-05-06 12:08:12,034 INFO L87 Difference]: Start difference. First operand 302 states and 305 transitions. Second operand has 180 states, 180 states have (on average 1.65) internal successors, (297), 179 states have internal predecessors, (297), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:08:35,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:35,990 INFO L93 Difference]: Finished difference Result 601 states and 612 transitions. [2021-05-06 12:08:35,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 180 states. [2021-05-06 12:08:35,991 INFO L78 Accepts]: Start accepts. Automaton has has 180 states, 180 states have (on average 1.65) internal successors, (297), 179 states have internal predecessors, (297), 2 states have call successors, (3), 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 301 [2021-05-06 12:08:35,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:35,992 INFO L225 Difference]: With dead ends: 601 [2021-05-06 12:08:35,992 INFO L226 Difference]: Without dead ends: 307 [2021-05-06 12:08:35,996 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 477 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 355 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36796 ImplicationChecksByTransitivity, 21638.3ms TimeCoverageRelationStatistics Valid=28470, Invalid=98622, Unknown=0, NotChecked=0, Total=127092 [2021-05-06 12:08:35,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2021-05-06 12:08:36,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 307. [2021-05-06 12:08:36,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 307 states, 302 states have (on average 1.0132450331125828) internal successors, (306), 302 states have internal predecessors, (306), 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 12:08:36,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 310 transitions. [2021-05-06 12:08:36,012 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 310 transitions. Word has length 301 [2021-05-06 12:08:36,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:36,012 INFO L480 AbstractCegarLoop]: Abstraction has 307 states and 310 transitions. [2021-05-06 12:08:36,012 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 180 states, 180 states have (on average 1.65) internal successors, (297), 179 states have internal predecessors, (297), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:08:36,012 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 310 transitions. [2021-05-06 12:08:36,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2021-05-06 12:08:36,013 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:36,013 INFO L523 BasicCegarLoop]: trace histogram [116, 115, 62, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:36,013 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable185 [2021-05-06 12:08:36,013 INFO L428 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:36,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:36,014 INFO L82 PathProgramCache]: Analyzing trace with hash 232128345, now seen corresponding path program 62 times [2021-05-06 12:08:36,014 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:36,014 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [424898565] [2021-05-06 12:08:36,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:36,023 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:08:36,024 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:36,025 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:36,030 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:36,032 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:36,047 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:08:36,057 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:36,059 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:08:36,059 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:36,062 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:08:36,068 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:08:36,073 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:36,074 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:36,075 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:08:36,075 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:36,078 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:08:36,084 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:08:36,088 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:36,091 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:08:36,102 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:36,103 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:36,110 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:08:36,112 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:08:36,118 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:08:36,128 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:36,129 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:36,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:37,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:37,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:37,536 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 12:08:37,537 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:37,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:43,392 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:43,392 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [424898565] [2021-05-06 12:08:43,392 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [424898565] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:43,392 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:43,392 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [183] imperfect sequences [] total 183 [2021-05-06 12:08:43,392 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1348389111] [2021-05-06 12:08:43,393 INFO L460 AbstractCegarLoop]: Interpolant automaton has 183 states [2021-05-06 12:08:43,393 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:43,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 183 interpolants. [2021-05-06 12:08:43,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9803, Invalid=23503, Unknown=0, NotChecked=0, Total=33306 [2021-05-06 12:08:43,395 INFO L87 Difference]: Start difference. First operand 307 states and 310 transitions. Second operand has 183 states, 183 states have (on average 1.650273224043716) internal successors, (302), 182 states have internal predecessors, (302), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:09:08,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:08,551 INFO L93 Difference]: Finished difference Result 611 states and 622 transitions. [2021-05-06 12:09:08,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 183 states. [2021-05-06 12:09:08,551 INFO L78 Accepts]: Start accepts. Automaton has has 183 states, 183 states have (on average 1.650273224043716) internal successors, (302), 182 states have internal predecessors, (302), 2 states have call successors, (3), 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 306 [2021-05-06 12:09:08,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:08,552 INFO L225 Difference]: With dead ends: 611 [2021-05-06 12:09:08,552 INFO L226 Difference]: Without dead ends: 312 [2021-05-06 12:09:08,556 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 485 GetRequests, 123 SyntacticMatches, 1 SemanticMatches, 361 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38112 ImplicationChecksByTransitivity, 22041.8ms TimeCoverageRelationStatistics Valid=29403, Invalid=102003, Unknown=0, NotChecked=0, Total=131406 [2021-05-06 12:09:08,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2021-05-06 12:09:08,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 312. [2021-05-06 12:09:08,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 312 states, 307 states have (on average 1.013029315960912) internal successors, (311), 307 states have internal predecessors, (311), 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 12:09:08,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 315 transitions. [2021-05-06 12:09:08,572 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 315 transitions. Word has length 306 [2021-05-06 12:09:08,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:08,573 INFO L480 AbstractCegarLoop]: Abstraction has 312 states and 315 transitions. [2021-05-06 12:09:08,573 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 183 states, 183 states have (on average 1.650273224043716) internal successors, (302), 182 states have internal predecessors, (302), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:09:08,573 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 315 transitions. [2021-05-06 12:09:08,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 312 [2021-05-06 12:09:08,581 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:08,581 INFO L523 BasicCegarLoop]: trace histogram [118, 117, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:08,581 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable188 [2021-05-06 12:09:08,581 INFO L428 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:08,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:08,581 INFO L82 PathProgramCache]: Analyzing trace with hash 65931552, now seen corresponding path program 63 times [2021-05-06 12:09:08,581 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:08,581 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [616604323] [2021-05-06 12:09:08,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:08,587 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:09:08,599 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:08,606 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:08,613 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:08,615 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:08,621 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:09:08,630 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:08,632 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:09:08,632 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:08,635 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:09:08,640 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:09:08,644 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:08,645 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:08,646 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:09:08,650 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:08,653 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:09:08,659 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:09:08,664 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:08,666 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:09:08,678 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:08,679 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:08,685 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:08,687 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:08,692 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:09:08,702 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:08,702 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:08,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:10,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:10,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:10,204 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 12:09:10,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:15,920 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:15,920 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [616604323] [2021-05-06 12:09:15,920 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [616604323] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:15,920 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:15,920 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [186] imperfect sequences [] total 186 [2021-05-06 12:09:15,920 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616219936] [2021-05-06 12:09:15,921 INFO L460 AbstractCegarLoop]: Interpolant automaton has 186 states [2021-05-06 12:09:15,921 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:15,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 186 interpolants. [2021-05-06 12:09:15,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10379, Invalid=25153, Unknown=0, NotChecked=0, Total=35532 [2021-05-06 12:09:15,923 INFO L87 Difference]: Start difference. First operand 312 states and 315 transitions. Second operand has 186 states, 186 states have (on average 1.6505376344086022) internal successors, (307), 185 states have internal predecessors, (307), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:09:41,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:09:41,655 INFO L93 Difference]: Finished difference Result 853 states and 864 transitions. [2021-05-06 12:09:41,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 186 states. [2021-05-06 12:09:41,656 INFO L78 Accepts]: Start accepts. Automaton has has 186 states, 186 states have (on average 1.6505376344086022) internal successors, (307), 185 states have internal predecessors, (307), 2 states have call successors, (3), 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 311 [2021-05-06 12:09:41,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:09:41,657 INFO L225 Difference]: With dead ends: 853 [2021-05-06 12:09:41,657 INFO L226 Difference]: Without dead ends: 549 [2021-05-06 12:09:41,661 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 124 SyntacticMatches, 1 SemanticMatches, 370 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40595 ImplicationChecksByTransitivity, 22647.5ms TimeCoverageRelationStatistics Valid=30616, Invalid=107396, Unknown=0, NotChecked=0, Total=138012 [2021-05-06 12:09:41,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 549 states. [2021-05-06 12:09:41,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 549 to 549. [2021-05-06 12:09:41,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 549 states, 544 states have (on average 1.0091911764705883) internal successors, (549), 544 states have internal predecessors, (549), 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 12:09:41,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 549 states to 549 states and 553 transitions. [2021-05-06 12:09:41,685 INFO L78 Accepts]: Start accepts. Automaton has 549 states and 553 transitions. Word has length 311 [2021-05-06 12:09:41,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:09:41,686 INFO L480 AbstractCegarLoop]: Abstraction has 549 states and 553 transitions. [2021-05-06 12:09:41,686 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 186 states, 186 states have (on average 1.6505376344086022) internal successors, (307), 185 states have internal predecessors, (307), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:09:41,686 INFO L276 IsEmpty]: Start isEmpty. Operand 549 states and 553 transitions. [2021-05-06 12:09:41,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 315 [2021-05-06 12:09:41,687 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:09:41,687 INFO L523 BasicCegarLoop]: trace histogram [119, 118, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:09:41,687 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable191 [2021-05-06 12:09:41,687 INFO L428 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:09:41,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:09:41,687 INFO L82 PathProgramCache]: Analyzing trace with hash -1363338040, now seen corresponding path program 64 times [2021-05-06 12:09:41,687 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:09:41,687 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1337383143] [2021-05-06 12:09:41,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:09:41,692 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:09:41,704 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:41,705 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:41,711 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:41,713 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:41,719 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:09:41,732 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:41,734 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:09:41,739 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:41,743 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:09:41,746 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:09:41,753 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:41,753 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:41,755 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:09:41,755 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:41,758 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:09:41,767 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:09:41,774 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:41,777 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:09:41,777 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:41,778 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:41,786 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:09:41,787 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:09:41,805 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:09:41,819 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:41,820 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:41,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:43,339 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:43,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:43,342 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 12:09:43,342 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:43,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:49,729 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:09:49,730 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1337383143] [2021-05-06 12:09:49,730 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1337383143] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:09:49,730 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:09:49,730 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [188] imperfect sequences [] total 188 [2021-05-06 12:09:49,730 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481996200] [2021-05-06 12:09:49,730 INFO L460 AbstractCegarLoop]: Interpolant automaton has 188 states [2021-05-06 12:09:49,730 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:09:49,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 188 interpolants. [2021-05-06 12:09:49,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10372, Invalid=24784, Unknown=0, NotChecked=0, Total=35156 [2021-05-06 12:09:49,732 INFO L87 Difference]: Start difference. First operand 549 states and 553 transitions. Second operand has 188 states, 188 states have (on average 1.648936170212766) internal successors, (310), 187 states have internal predecessors, (310), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:10:17,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:10:17,226 INFO L93 Difference]: Finished difference Result 861 states and 875 transitions. [2021-05-06 12:10:17,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 188 states. [2021-05-06 12:10:17,227 INFO L78 Accepts]: Start accepts. Automaton has has 188 states, 188 states have (on average 1.648936170212766) internal successors, (310), 187 states have internal predecessors, (310), 2 states have call successors, (3), 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 314 [2021-05-06 12:10:17,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:10:17,228 INFO L225 Difference]: With dead ends: 861 [2021-05-06 12:10:17,228 INFO L226 Difference]: Without dead ends: 556 [2021-05-06 12:10:17,234 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 371 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40243 ImplicationChecksByTransitivity, 24411.0ms TimeCoverageRelationStatistics Valid=31110, Invalid=107646, Unknown=0, NotChecked=0, Total=138756 [2021-05-06 12:10:17,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 556 states. [2021-05-06 12:10:17,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 556 to 320. [2021-05-06 12:10:17,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 320 states, 315 states have (on average 1.0126984126984127) internal successors, (319), 315 states have internal predecessors, (319), 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 12:10:17,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 320 states to 320 states and 323 transitions. [2021-05-06 12:10:17,256 INFO L78 Accepts]: Start accepts. Automaton has 320 states and 323 transitions. Word has length 314 [2021-05-06 12:10:17,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:10:17,256 INFO L480 AbstractCegarLoop]: Abstraction has 320 states and 323 transitions. [2021-05-06 12:10:17,256 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 188 states, 188 states have (on average 1.648936170212766) internal successors, (310), 187 states have internal predecessors, (310), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:10:17,256 INFO L276 IsEmpty]: Start isEmpty. Operand 320 states and 323 transitions. [2021-05-06 12:10:17,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 320 [2021-05-06 12:10:17,257 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:10:17,258 INFO L523 BasicCegarLoop]: trace histogram [121, 120, 65, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:10:17,258 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable194 [2021-05-06 12:10:17,258 INFO L428 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:10:17,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:10:17,258 INFO L82 PathProgramCache]: Analyzing trace with hash 1187267473, now seen corresponding path program 65 times [2021-05-06 12:10:17,258 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:10:17,258 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1027713561] [2021-05-06 12:10:17,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:10:17,265 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:10:17,279 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:17,281 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:17,289 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:17,291 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:17,300 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:10:17,316 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:17,319 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:10:17,319 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:17,324 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:10:17,334 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:10:17,343 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:17,344 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:17,346 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:10:17,346 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:17,350 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:10:17,361 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:10:17,370 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:17,373 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:10:17,374 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:17,375 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:10:17,384 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:10:17,386 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:10:17,408 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:10:17,424 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:10:17,426 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:10:17,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:19,215 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:10:19,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:10:19,218 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 12:10:19,218 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:19,219 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:10:26,204 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:10:26,204 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1027713561] [2021-05-06 12:10:26,204 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1027713561] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:10:26,204 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:10:26,204 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [191] imperfect sequences [] total 191 [2021-05-06 12:10:26,204 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069503023] [2021-05-06 12:10:26,204 INFO L460 AbstractCegarLoop]: Interpolant automaton has 191 states [2021-05-06 12:10:26,204 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:10:26,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 191 interpolants. [2021-05-06 12:10:26,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10697, Invalid=25593, Unknown=0, NotChecked=0, Total=36290 [2021-05-06 12:10:26,207 INFO L87 Difference]: Start difference. First operand 320 states and 323 transitions. Second operand has 191 states, 191 states have (on average 1.649214659685864) internal successors, (315), 190 states have internal predecessors, (315), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)