/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/Mono3_1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 11:42:07,711 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 11:42:07,713 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 11:42:07,754 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 11:42:07,934 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 11:42:07,935 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 11:42:07,936 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 11:42:07,943 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 11:42:07,957 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 11:42:07,958 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 11:42:07,961 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 11:42:07,961 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 11:42:07,961 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 11:42:07,961 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 11:42:07,961 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 11:42:07,961 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 11:42:07,962 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 11:42:07,962 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 11:42:07,962 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 11:42:07,963 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 11:42:07,963 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 11:42:07,963 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 11:42:07,963 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 11:42:07,963 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 11:42:07,963 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 11:42:07,963 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 11:42:07,964 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:42:07,964 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 11:42:07,964 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 11:42:07,964 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 11:42:07,964 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 11:42:07,964 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 11:42:08,259 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 11:42:08,287 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 11:42:08,290 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 11:42:08,291 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 11:42:08,292 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 11:42:08,292 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/Mono3_1.c [2021-05-06 11:42:08,344 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/66036b57c/65c303e381384e369d98d4370a751e7d/FLAG5735dc60d [2021-05-06 11:42:08,763 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 11:42:08,763 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono3_1.c [2021-05-06 11:42:08,768 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/66036b57c/65c303e381384e369d98d4370a751e7d/FLAG5735dc60d [2021-05-06 11:42:08,787 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/66036b57c/65c303e381384e369d98d4370a751e7d [2021-05-06 11:42:08,789 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 11:42:08,791 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 11:42:08,794 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 11:42:08,794 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 11:42:08,798 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 11:42:08,798 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:42:08" (1/1) ... [2021-05-06 11:42:08,799 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2f9fd881 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:42:08, skipping insertion in model container [2021-05-06 11:42:08,799 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:42:08" (1/1) ... [2021-05-06 11:42:08,806 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 11:42:08,819 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 11:42:08,914 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/Mono3_1.c[311,324] [2021-05-06 11:42:08,922 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:42:08,930 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 11:42:08,940 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/Mono3_1.c[311,324] [2021-05-06 11:42:08,942 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:42:08,957 INFO L208 MainTranslator]: Completed translation [2021-05-06 11:42:08,957 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:42:08 WrapperNode [2021-05-06 11:42:08,957 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 11:42:08,959 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 11:42:08,959 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 11:42:08,960 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 11:42:08,970 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:42:08" (1/1) ... [2021-05-06 11:42:08,971 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:42:08" (1/1) ... [2021-05-06 11:42:08,976 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:42:08" (1/1) ... [2021-05-06 11:42:08,977 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:42:08" (1/1) ... [2021-05-06 11:42:08,986 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:42:08" (1/1) ... [2021-05-06 11:42:08,993 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:42:08" (1/1) ... [2021-05-06 11:42:08,999 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:42:08" (1/1) ... [2021-05-06 11:42:09,003 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 11:42:09,004 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 11:42:09,004 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 11:42:09,004 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 11:42:09,033 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:42:08" (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 11:42:09,122 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 11:42:09,122 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 11:42:09,122 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 11:42:09,122 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 11:42:09,123 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 11:42:09,123 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 11:42:09,123 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 11:42:09,123 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 11:42:09,123 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 11:42:09,123 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 11:42:09,124 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 11:42:09,124 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 11:42:09,124 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 11:42:09,124 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 11:42:09,124 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 11:42:09,124 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 11:42:09,125 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 11:42:09,411 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 11:42:09,411 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 11:42:09,413 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:42:09 BoogieIcfgContainer [2021-05-06 11:42:09,413 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 11:42:09,414 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 11:42:09,414 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 11:42:09,417 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 11:42:09,417 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 11:42:08" (1/3) ... [2021-05-06 11:42:09,418 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d798446 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:42:09, skipping insertion in model container [2021-05-06 11:42:09,418 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:42:08" (2/3) ... [2021-05-06 11:42:09,418 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d798446 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:42:09, skipping insertion in model container [2021-05-06 11:42:09,418 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:42:09" (3/3) ... [2021-05-06 11:42:09,419 INFO L111 eAbstractionObserver]: Analyzing ICFG Mono3_1.c [2021-05-06 11:42:09,424 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 11:42:09,427 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 11:42:09,441 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 11:42:09,458 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 11:42:09,458 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 11:42:09,458 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 11:42:09,458 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 11:42:09,458 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 11:42:09,458 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 11:42:09,459 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 11:42:09,459 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 11:42:09,470 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:42:09,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 11:42:09,477 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:09,477 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:09,478 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:09,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:09,482 INFO L82 PathProgramCache]: Analyzing trace with hash 1326077006, now seen corresponding path program 1 times [2021-05-06 11:42:09,492 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:09,492 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [510052302] [2021-05-06 11:42:09,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:09,547 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:42:09,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:09,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:09,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:09,805 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:42:09,807 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:09,807 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [510052302] [2021-05-06 11:42:09,809 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [510052302] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:09,809 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:09,809 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 11:42:09,810 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463714755] [2021-05-06 11:42:09,813 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 11:42:09,814 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:09,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 11:42:09,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:42:09,827 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:09,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:09,909 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-05-06 11:42:09,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 11:42:09,911 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-06 11:42:09,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:09,917 INFO L225 Difference]: With dead ends: 31 [2021-05-06 11:42:09,917 INFO L226 Difference]: Without dead ends: 14 [2021-05-06 11:42:09,921 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 94.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:42:09,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-06 11:42:09,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-06 11:42:09,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:09,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-06 11:42:09,959 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-05-06 11:42:09,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:09,959 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-06 11:42:09,960 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:09,960 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-06 11:42:09,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 11:42:09,961 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:09,961 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:09,961 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 11:42:09,962 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:09,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:09,963 INFO L82 PathProgramCache]: Analyzing trace with hash 1315918275, now seen corresponding path program 1 times [2021-05-06 11:42:09,963 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:09,964 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [948859811] [2021-05-06 11:42:09,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:09,973 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:42:09,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:10,033 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:10,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:10,043 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:42:10,043 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:10,043 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [948859811] [2021-05-06 11:42:10,043 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [948859811] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:10,044 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:10,044 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 11:42:10,044 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2134288882] [2021-05-06 11:42:10,045 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 11:42:10,045 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:10,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 11:42:10,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 11:42:10,046 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:10,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:10,158 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2021-05-06 11:42:10,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 11:42:10,160 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-06 11:42:10,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:10,161 INFO L225 Difference]: With dead ends: 25 [2021-05-06 11:42:10,161 INFO L226 Difference]: Without dead ends: 17 [2021-05-06 11:42:10,162 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 44.4ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:42:10,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-06 11:42:10,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-05-06 11:42:10,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:10,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-05-06 11:42:10,168 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2021-05-06 11:42:10,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:10,169 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-05-06 11:42:10,169 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:10,169 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-05-06 11:42:10,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-06 11:42:10,169 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:10,169 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:10,169 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 11:42:10,170 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:10,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:10,170 INFO L82 PathProgramCache]: Analyzing trace with hash 644646283, now seen corresponding path program 1 times [2021-05-06 11:42:10,170 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:10,170 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [939489897] [2021-05-06 11:42:10,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:10,220 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:42:10,242 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:10,288 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:42:10,314 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:42:10,352 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 11:42:10,357 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:42:10,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:10,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:10,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:10,515 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:42:10,630 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:10,630 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [939489897] [2021-05-06 11:42:10,631 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [939489897] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:10,631 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:10,631 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 11:42:10,631 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660569447] [2021-05-06 11:42:10,631 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 11:42:10,632 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:10,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 11:42:10,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:42:10,633 INFO L87 Difference]: Start difference. First operand 16 states and 17 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 11:42:10,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:10,854 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2021-05-06 11:42:10,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 11:42:10,855 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 11:42:10,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:10,856 INFO L225 Difference]: With dead ends: 26 [2021-05-06 11:42:10,856 INFO L226 Difference]: Without dead ends: 21 [2021-05-06 11:42:10,858 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 6 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 286.0ms TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:42:10,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-06 11:42:10,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2021-05-06 11:42:10,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:10,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2021-05-06 11:42:10,870 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 14 [2021-05-06 11:42:10,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:10,870 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2021-05-06 11:42:10,870 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 11:42:10,870 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2021-05-06 11:42:10,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 11:42:10,871 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:10,871 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:10,871 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 11:42:10,871 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:10,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:10,872 INFO L82 PathProgramCache]: Analyzing trace with hash 1923470149, now seen corresponding path program 1 times [2021-05-06 11:42:10,873 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:10,873 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1202538032] [2021-05-06 11:42:10,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:10,905 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:42:10,964 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:10,973 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:14,993 WARN L205 SmtUtils]: Spent 4.01 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:42:19,014 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification that was a NOOP. DAG size: 14 [2021-05-06 11:42:23,046 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 14 DAG size of output: 1 [2021-05-06 11:42:23,088 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:42:23,114 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:42:23,134 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:42:23,162 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 11:42:23,174 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:42:23,193 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:23,218 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:42:23,238 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:42:23,260 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 11:42:23,265 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:23,272 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:42:23,299 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:23,306 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:27,334 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 15 DAG size of output: 1 [2021-05-06 11:42:31,360 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification that was a NOOP. DAG size: 15 [2021-05-06 11:42:31,783 WARN L205 SmtUtils]: Spent 421.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:42:31,805 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:42:31,810 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:42:31,833 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:42:31,855 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 11:42:31,858 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:31,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:31,993 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:31,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:32,001 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:42:32,005 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:32,037 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:32,037 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1202538032] [2021-05-06 11:42:32,037 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1202538032] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:32,038 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:32,038 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 11:42:32,038 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561929] [2021-05-06 11:42:32,038 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 11:42:32,038 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:32,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 11:42:32,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:42:32,039 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:32,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:32,128 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-05-06 11:42:32,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 11:42:32,129 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-06 11:42:32,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:32,129 INFO L225 Difference]: With dead ends: 31 [2021-05-06 11:42:32,129 INFO L226 Difference]: Without dead ends: 23 [2021-05-06 11:42:32,130 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 9 SyntacticMatches, 5 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 111.1ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:42:32,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-06 11:42:32,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-05-06 11:42:32,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:32,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2021-05-06 11:42:32,134 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 17 [2021-05-06 11:42:32,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:32,134 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2021-05-06 11:42:32,134 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:32,134 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2021-05-06 11:42:32,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-06 11:42:32,135 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:32,135 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:32,135 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-06 11:42:32,135 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:32,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:32,136 INFO L82 PathProgramCache]: Analyzing trace with hash -896593651, now seen corresponding path program 2 times [2021-05-06 11:42:32,136 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:32,136 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1282924677] [2021-05-06 11:42:32,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:32,149 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:42:32,173 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:32,176 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:32,206 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:42:32,210 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:42:32,232 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:42:32,264 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 11:42:32,273 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:42:32,290 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:32,306 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:42:32,320 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:42:32,348 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 11:42:32,350 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:32,364 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:42:32,366 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:32,375 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:32,483 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:42:32,493 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:42:32,537 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:42:32,561 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 11:42:32,570 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:32,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:32,699 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:32,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:32,716 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:42:32,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:32,801 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:32,801 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1282924677] [2021-05-06 11:42:32,801 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1282924677] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:32,801 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:32,801 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 11:42:32,801 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [680767572] [2021-05-06 11:42:32,802 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 11:42:32,802 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:32,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 11:42:32,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:42:32,802 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:32,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:32,928 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2021-05-06 11:42:32,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 11:42:32,929 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-06 11:42:32,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:32,930 INFO L225 Difference]: With dead ends: 34 [2021-05-06 11:42:32,931 INFO L226 Difference]: Without dead ends: 26 [2021-05-06 11:42:32,932 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 10 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 159.9ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:42:32,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-06 11:42:32,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2021-05-06 11:42:32,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:32,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2021-05-06 11:42:32,943 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 20 [2021-05-06 11:42:32,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:32,944 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2021-05-06 11:42:32,944 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:32,944 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2021-05-06 11:42:32,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-06 11:42:32,945 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:32,945 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:32,945 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-06 11:42:32,945 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:32,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:32,946 INFO L82 PathProgramCache]: Analyzing trace with hash 438017605, now seen corresponding path program 3 times [2021-05-06 11:42:32,946 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:32,946 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [555672733] [2021-05-06 11:42:32,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:32,965 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:42:32,994 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:32,997 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:33,040 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:42:33,046 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:42:33,067 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:42:33,097 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 11:42:33,108 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:42:33,126 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:33,141 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:42:33,154 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:42:33,177 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 11:42:33,178 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:33,184 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:42:33,205 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:33,209 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:33,326 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:42:33,352 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:42:33,356 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:42:33,376 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:42:33,399 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 11:42:33,401 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:33,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:33,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:33,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:33,507 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:42:33,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:33,582 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:33,582 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [555672733] [2021-05-06 11:42:33,582 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [555672733] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:33,582 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:33,582 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 11:42:33,583 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819816963] [2021-05-06 11:42:33,583 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 11:42:33,583 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:33,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 11:42:33,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:42:33,584 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:33,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:33,750 INFO L93 Difference]: Finished difference Result 37 states and 41 transitions. [2021-05-06 11:42:33,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 11:42:33,751 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-06 11:42:33,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:33,752 INFO L225 Difference]: With dead ends: 37 [2021-05-06 11:42:33,752 INFO L226 Difference]: Without dead ends: 29 [2021-05-06 11:42:33,752 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 9 SyntacticMatches, 9 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 196.8ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:42:33,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-06 11:42:33,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2021-05-06 11:42:33,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:33,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-05-06 11:42:33,759 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2021-05-06 11:42:33,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:33,759 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-05-06 11:42:33,759 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:33,759 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-05-06 11:42:33,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-06 11:42:33,760 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:33,760 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:33,760 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-06 11:42:33,760 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:33,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:33,761 INFO L82 PathProgramCache]: Analyzing trace with hash 1329686029, now seen corresponding path program 4 times [2021-05-06 11:42:33,761 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:33,761 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1070143086] [2021-05-06 11:42:33,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:33,772 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:42:33,804 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:33,807 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:33,865 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:42:33,869 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:42:33,889 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:42:33,917 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 11:42:33,924 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:42:33,940 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:33,961 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:42:33,976 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:42:34,000 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 11:42:34,002 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:34,008 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:42:34,035 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:34,037 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:34,078 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:42:34,082 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:42:34,102 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:42:34,126 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 11:42:34,128 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:34,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:34,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:34,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:34,227 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:42:34,232 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:34,340 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:34,340 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1070143086] [2021-05-06 11:42:34,340 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1070143086] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:34,340 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:34,341 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 11:42:34,341 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1323633578] [2021-05-06 11:42:34,341 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 11:42:34,341 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:34,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 11:42:34,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:42:34,342 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:34,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:34,560 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2021-05-06 11:42:34,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:42:34,560 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-06 11:42:34,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:34,561 INFO L225 Difference]: With dead ends: 40 [2021-05-06 11:42:34,561 INFO L226 Difference]: Without dead ends: 32 [2021-05-06 11:42:34,561 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 9 SyntacticMatches, 11 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 264.0ms TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:42:34,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-06 11:42:34,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2021-05-06 11:42:34,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 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 11:42:34,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2021-05-06 11:42:34,568 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 26 [2021-05-06 11:42:34,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:34,568 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2021-05-06 11:42:34,568 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:34,568 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2021-05-06 11:42:34,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-06 11:42:34,569 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:34,569 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:34,569 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-06 11:42:34,569 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:34,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:34,569 INFO L82 PathProgramCache]: Analyzing trace with hash 650979653, now seen corresponding path program 5 times [2021-05-06 11:42:34,570 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:34,570 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [846718990] [2021-05-06 11:42:34,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:34,588 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:42:34,608 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:34,614 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:34,731 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:42:34,735 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:42:34,759 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:42:34,790 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 11:42:34,798 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:42:34,799 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:34,816 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:42:34,845 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:42:34,867 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 11:42:34,868 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:34,874 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:42:34,898 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:34,901 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:34,956 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:42:34,960 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:42:34,991 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:42:35,015 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 11:42:35,017 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:35,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:35,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:35,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:35,108 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:42:35,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:35,227 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:35,227 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [846718990] [2021-05-06 11:42:35,227 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [846718990] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:35,228 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:35,228 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:42:35,228 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143920269] [2021-05-06 11:42:35,228 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:42:35,228 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:35,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:42:35,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:42:35,229 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:35,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:35,476 INFO L93 Difference]: Finished difference Result 43 states and 47 transitions. [2021-05-06 11:42:35,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:42:35,477 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-06 11:42:35,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:35,479 INFO L225 Difference]: With dead ends: 43 [2021-05-06 11:42:35,479 INFO L226 Difference]: Without dead ends: 35 [2021-05-06 11:42:35,479 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 10 SyntacticMatches, 12 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 259.0ms TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:42:35,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-06 11:42:35,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2021-05-06 11:42:35,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.103448275862069) internal successors, (32), 29 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:35,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2021-05-06 11:42:35,489 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 29 [2021-05-06 11:42:35,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:35,490 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2021-05-06 11:42:35,491 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:35,491 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2021-05-06 11:42:35,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-06 11:42:35,492 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:35,492 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:35,492 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-06 11:42:35,492 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:35,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:35,492 INFO L82 PathProgramCache]: Analyzing trace with hash 2015361805, now seen corresponding path program 6 times [2021-05-06 11:42:35,492 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:35,493 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [296814411] [2021-05-06 11:42:35,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:35,505 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:42:35,506 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:35,508 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:36,421 WARN L205 SmtUtils]: Spent 907.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 1 [2021-05-06 11:42:36,435 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:42:36,438 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:42:36,481 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:42:36,509 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 11:42:36,516 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:42:36,531 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:36,550 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:42:36,564 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:42:36,586 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 11:42:36,588 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:36,592 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:42:36,614 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:36,616 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:36,646 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:42:36,651 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:42:36,668 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:42:36,695 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 11:42:36,698 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:36,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:36,770 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:36,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:36,777 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:42:36,782 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:36,928 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:36,928 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [296814411] [2021-05-06 11:42:36,928 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [296814411] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:36,928 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:36,928 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:42:36,928 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375171190] [2021-05-06 11:42:36,929 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:42:36,929 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:36,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:42:36,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:42:36,930 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:37,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:37,218 INFO L93 Difference]: Finished difference Result 46 states and 50 transitions. [2021-05-06 11:42:37,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 11:42:37,219 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-06 11:42:37,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:37,220 INFO L225 Difference]: With dead ends: 46 [2021-05-06 11:42:37,220 INFO L226 Difference]: Without dead ends: 38 [2021-05-06 11:42:37,220 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 10 SyntacticMatches, 14 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 316.7ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:42:37,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-06 11:42:37,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2021-05-06 11:42:37,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.09375) internal successors, (35), 32 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:37,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2021-05-06 11:42:37,237 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 32 [2021-05-06 11:42:37,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:37,238 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2021-05-06 11:42:37,238 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:37,238 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2021-05-06 11:42:37,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-06 11:42:37,241 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:37,241 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:37,241 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-05-06 11:42:37,241 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:37,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:37,242 INFO L82 PathProgramCache]: Analyzing trace with hash 753562693, now seen corresponding path program 7 times [2021-05-06 11:42:37,242 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:37,242 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1082744916] [2021-05-06 11:42:37,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:37,258 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:42:37,277 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:37,280 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:37,406 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:42:37,425 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:42:37,429 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:42:37,446 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:42:37,475 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 11:42:37,482 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:42:37,483 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:37,498 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:42:37,533 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:42:37,560 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 11:42:37,561 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:37,566 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:42:37,568 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:37,573 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:37,612 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:42:37,617 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:42:37,656 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:42:37,692 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 11:42:37,694 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:37,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:37,780 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:37,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:37,786 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:42:37,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:37,982 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:37,982 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1082744916] [2021-05-06 11:42:37,982 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1082744916] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:37,983 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:37,983 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:42:37,983 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423659307] [2021-05-06 11:42:37,983 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:42:37,983 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:37,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:42:37,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:42:37,984 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:38,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:38,334 INFO L93 Difference]: Finished difference Result 49 states and 53 transitions. [2021-05-06 11:42:38,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:42:38,335 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-06 11:42:38,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:38,336 INFO L225 Difference]: With dead ends: 49 [2021-05-06 11:42:38,336 INFO L226 Difference]: Without dead ends: 41 [2021-05-06 11:42:38,336 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 9 SyntacticMatches, 17 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 377.0ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:42:38,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-06 11:42:38,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2021-05-06 11:42:38,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 35 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:38,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2021-05-06 11:42:38,344 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 35 [2021-05-06 11:42:38,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:38,344 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2021-05-06 11:42:38,345 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:38,345 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2021-05-06 11:42:38,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-06 11:42:38,345 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:38,345 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:38,345 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-05-06 11:42:38,346 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:38,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:38,346 INFO L82 PathProgramCache]: Analyzing trace with hash 49991693, now seen corresponding path program 8 times [2021-05-06 11:42:38,346 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:38,346 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1747392379] [2021-05-06 11:42:38,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:38,355 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:42:38,375 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:38,378 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:38,409 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:42:38,415 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:42:38,437 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:42:38,467 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 11:42:38,473 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:42:38,508 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:38,520 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:42:38,534 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:42:38,556 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 11:42:38,558 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:38,562 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:42:38,563 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:38,566 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:38,598 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:42:38,603 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:42:38,642 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:42:38,664 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 11:42:38,666 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:38,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:38,742 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:38,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:38,746 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:42:38,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:38,966 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:38,966 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1747392379] [2021-05-06 11:42:38,967 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1747392379] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:38,967 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:38,967 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 11:42:38,967 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1619605238] [2021-05-06 11:42:38,967 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 11:42:38,967 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:38,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 11:42:38,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:42:38,968 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 11 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:39,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:39,406 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2021-05-06 11:42:39,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 11:42:39,406 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 11 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-06 11:42:39,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:39,407 INFO L225 Difference]: With dead ends: 52 [2021-05-06 11:42:39,407 INFO L226 Difference]: Without dead ends: 44 [2021-05-06 11:42:39,407 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 9 SyntacticMatches, 19 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 458.1ms TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:42:39,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-06 11:42:39,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2021-05-06 11:42:39,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:39,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2021-05-06 11:42:39,415 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 38 [2021-05-06 11:42:39,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:39,415 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2021-05-06 11:42:39,415 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 11 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:39,415 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2021-05-06 11:42:39,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-06 11:42:39,416 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:39,416 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:39,416 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-05-06 11:42:39,416 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:39,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:39,417 INFO L82 PathProgramCache]: Analyzing trace with hash -593264827, now seen corresponding path program 9 times [2021-05-06 11:42:39,417 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:39,417 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [88849252] [2021-05-06 11:42:39,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:39,426 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:42:39,427 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:39,429 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:39,544 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:42:39,549 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:42:39,585 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:42:39,612 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 11:42:39,619 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:42:39,620 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:39,635 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:42:39,665 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:42:39,686 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 11:42:39,688 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:39,692 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:42:39,715 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:39,717 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:39,776 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:42:39,781 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:42:39,804 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:42:39,823 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 11:42:39,825 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:39,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:39,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:39,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:39,928 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:42:39,930 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:40,185 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:40,185 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [88849252] [2021-05-06 11:42:40,185 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [88849252] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:40,185 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:40,185 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:42:40,185 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589549351] [2021-05-06 11:42:40,186 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:42:40,186 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:40,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:42:40,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:42:40,186 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:40,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:40,648 INFO L93 Difference]: Finished difference Result 55 states and 59 transitions. [2021-05-06 11:42:40,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:42:40,648 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-06 11:42:40,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:40,649 INFO L225 Difference]: With dead ends: 55 [2021-05-06 11:42:40,649 INFO L226 Difference]: Without dead ends: 47 [2021-05-06 11:42:40,649 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 9 SyntacticMatches, 21 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 515.4ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:42:40,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-06 11:42:40,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2021-05-06 11:42:40,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 41 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 11:42:40,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2021-05-06 11:42:40,656 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 41 [2021-05-06 11:42:40,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:40,656 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2021-05-06 11:42:40,657 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.8461538461538463) internal successors, (37), 12 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:40,657 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2021-05-06 11:42:40,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-06 11:42:40,657 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:40,657 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:40,657 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-05-06 11:42:40,658 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:40,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:40,658 INFO L82 PathProgramCache]: Analyzing trace with hash 295822605, now seen corresponding path program 10 times [2021-05-06 11:42:40,658 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:40,658 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [78931375] [2021-05-06 11:42:40,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:40,677 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:42:40,680 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:40,682 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:40,764 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:42:40,768 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:42:40,797 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:42:40,825 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 11:42:40,831 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:42:40,846 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:40,860 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:42:40,873 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:42:40,896 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 11:42:40,897 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:40,902 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:42:40,902 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:40,905 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:41,347 WARN L205 SmtUtils]: Spent 441.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 1 [2021-05-06 11:42:41,371 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:42:41,375 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:42:41,413 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:42:41,435 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 11:42:41,437 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:41,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:41,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:41,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:41,525 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:42:41,529 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:41,797 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:41,798 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [78931375] [2021-05-06 11:42:41,798 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [78931375] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:41,798 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:41,798 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:42:41,798 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381591129] [2021-05-06 11:42:41,798 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:42:41,798 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:41,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:42:41,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:42:41,799 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 13 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 11:42:42,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:42,331 INFO L93 Difference]: Finished difference Result 58 states and 62 transitions. [2021-05-06 11:42:42,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 11:42:42,332 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 13 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 11:42:42,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:42,333 INFO L225 Difference]: With dead ends: 58 [2021-05-06 11:42:42,333 INFO L226 Difference]: Without dead ends: 50 [2021-05-06 11:42:42,333 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 10 SyntacticMatches, 22 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 525.2ms TimeCoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:42:42,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-06 11:42:42,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2021-05-06 11:42:42,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 44 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:42,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2021-05-06 11:42:42,341 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 44 [2021-05-06 11:42:42,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:42,342 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2021-05-06 11:42:42,342 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 13 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 11:42:42,342 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2021-05-06 11:42:42,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-06 11:42:42,342 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:42,343 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:42,343 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-05-06 11:42:42,343 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:42,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:42,343 INFO L82 PathProgramCache]: Analyzing trace with hash 36194885, now seen corresponding path program 11 times [2021-05-06 11:42:42,343 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:42,343 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1037421017] [2021-05-06 11:42:42,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:42,376 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:42:42,379 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:42,388 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:42,442 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:42:42,446 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:42:42,474 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:42:42,513 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 11:42:42,522 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:42:42,523 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:42,539 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:42:42,559 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:42:42,575 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 11:42:42,578 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:42,585 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:42:42,591 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:42,593 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:42,630 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:42:42,634 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:42:42,667 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:42:42,686 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 11:42:42,689 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:42,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:42,786 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:42,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:42,792 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:42:42,796 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:43,117 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:43,117 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1037421017] [2021-05-06 11:42:43,117 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1037421017] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:43,117 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:43,117 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:42:43,117 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678055525] [2021-05-06 11:42:43,117 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:42:43,117 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:43,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:42:43,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:42:43,118 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand has 15 states, 15 states have (on average 2.8666666666666667) internal successors, (43), 14 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:43,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:43,706 INFO L93 Difference]: Finished difference Result 61 states and 65 transitions. [2021-05-06 11:42:43,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:42:43,706 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.8666666666666667) internal successors, (43), 14 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-05-06 11:42:43,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:43,707 INFO L225 Difference]: With dead ends: 61 [2021-05-06 11:42:43,707 INFO L226 Difference]: Without dead ends: 53 [2021-05-06 11:42:43,707 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 10 SyntacticMatches, 24 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 611.6ms TimeCoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2021-05-06 11:42:43,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-06 11:42:43,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2021-05-06 11:42:43,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.0638297872340425) internal successors, (50), 47 states have internal predecessors, (50), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:43,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2021-05-06 11:42:43,716 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 47 [2021-05-06 11:42:43,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:43,716 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2021-05-06 11:42:43,716 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.8666666666666667) internal successors, (43), 14 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:43,716 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2021-05-06 11:42:43,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-06 11:42:43,717 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:43,717 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:43,720 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-05-06 11:42:43,721 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:43,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:43,721 INFO L82 PathProgramCache]: Analyzing trace with hash 702888461, now seen corresponding path program 12 times [2021-05-06 11:42:43,721 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:43,722 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1568887789] [2021-05-06 11:42:43,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:43,732 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:42:43,754 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:43,756 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:43,794 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:42:43,798 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:42:43,810 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:42:43,833 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 11:42:43,837 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:42:43,838 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:43,852 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:42:43,879 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:42:43,903 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 11:42:43,904 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:43,908 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:42:43,926 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:43,928 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:43,970 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:42:43,973 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:42:43,987 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:42:44,004 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 11:42:44,005 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:44,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:44,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:44,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:44,079 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:42:44,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:44,386 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:44,387 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1568887789] [2021-05-06 11:42:44,387 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1568887789] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:44,387 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:44,387 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:42:44,387 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086129929] [2021-05-06 11:42:44,387 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:42:44,387 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:44,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:42:44,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:42:44,388 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand has 16 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:44,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:44,991 INFO L93 Difference]: Finished difference Result 64 states and 68 transitions. [2021-05-06 11:42:44,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 11:42:44,991 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-06 11:42:44,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:44,992 INFO L225 Difference]: With dead ends: 64 [2021-05-06 11:42:44,992 INFO L226 Difference]: Without dead ends: 56 [2021-05-06 11:42:44,993 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 10 SyntacticMatches, 26 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 600.9ms TimeCoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:42:44,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-06 11:42:45,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2021-05-06 11:42:45,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.06) internal successors, (53), 50 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:45,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2021-05-06 11:42:45,001 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 50 [2021-05-06 11:42:45,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:45,001 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2021-05-06 11:42:45,001 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:45,001 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2021-05-06 11:42:45,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-06 11:42:45,002 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:45,002 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:45,002 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-05-06 11:42:45,002 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:45,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:45,002 INFO L82 PathProgramCache]: Analyzing trace with hash -2052532923, now seen corresponding path program 13 times [2021-05-06 11:42:45,002 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:45,003 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [93825152] [2021-05-06 11:42:45,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:45,013 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:42:45,031 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:45,033 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:45,465 WARN L205 SmtUtils]: Spent 430.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 1 [2021-05-06 11:42:45,483 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:42:45,497 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:42:45,517 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:42:45,543 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 11:42:45,549 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:42:45,550 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:45,567 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:42:45,593 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:42:45,611 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 11:42:45,613 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:45,616 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:42:45,617 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:45,619 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:45,642 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:42:45,646 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:42:45,672 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:42:45,688 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 11:42:45,689 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:45,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:45,774 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:45,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:45,778 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 11:42:45,781 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:46,170 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:46,171 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [93825152] [2021-05-06 11:42:46,171 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [93825152] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:46,171 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:46,171 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:42:46,171 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596487683] [2021-05-06 11:42:46,171 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:42:46,171 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:46,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:42:46,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:42:46,172 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 16 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:46,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:46,856 INFO L93 Difference]: Finished difference Result 67 states and 71 transitions. [2021-05-06 11:42:46,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 11:42:46,856 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 16 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-05-06 11:42:46,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:46,857 INFO L225 Difference]: With dead ends: 67 [2021-05-06 11:42:46,857 INFO L226 Difference]: Without dead ends: 59 [2021-05-06 11:42:46,858 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 10 SyntacticMatches, 28 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 728.8ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-06 11:42:46,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-06 11:42:46,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2021-05-06 11:42:46,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.0566037735849056) internal successors, (56), 53 states have internal predecessors, (56), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:46,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2021-05-06 11:42:46,867 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 53 [2021-05-06 11:42:46,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:46,867 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2021-05-06 11:42:46,868 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 16 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:46,868 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2021-05-06 11:42:46,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-06 11:42:46,868 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:46,868 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:46,868 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-05-06 11:42:46,869 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:46,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:46,869 INFO L82 PathProgramCache]: Analyzing trace with hash 898944781, now seen corresponding path program 14 times [2021-05-06 11:42:46,869 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:46,869 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [533734692] [2021-05-06 11:42:46,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:46,879 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:42:46,880 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:46,884 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:46,909 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:42:46,913 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:42:46,949 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:42:46,977 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 11:42:46,983 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:42:46,998 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:47,014 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:42:47,028 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:42:47,051 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 11:42:47,052 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:47,056 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:42:47,078 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:47,082 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:47,107 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:42:47,111 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:42:47,132 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:42:47,148 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 11:42:47,150 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:47,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:47,224 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:47,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:47,236 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:42:47,239 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:47,999 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:47,999 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [533734692] [2021-05-06 11:42:47,999 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [533734692] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:47,999 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:47,999 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 11:42:47,999 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834407840] [2021-05-06 11:42:47,999 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 11:42:48,000 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:48,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 11:42:48,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:42:48,000 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand has 32 states, 32 states have (on average 1.625) internal successors, (52), 31 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:49,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:49,654 INFO L93 Difference]: Finished difference Result 69 states and 73 transitions. [2021-05-06 11:42:49,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 11:42:49,655 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.625) internal successors, (52), 31 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 56 [2021-05-06 11:42:49,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:49,655 INFO L225 Difference]: With dead ends: 69 [2021-05-06 11:42:49,655 INFO L226 Difference]: Without dead ends: 61 [2021-05-06 11:42:49,656 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 9 SyntacticMatches, 17 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 450 ImplicationChecksByTransitivity, 1748.7ms TimeCoverageRelationStatistics Valid=237, Invalid=3545, Unknown=0, NotChecked=0, Total=3782 [2021-05-06 11:42:49,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-06 11:42:49,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-05-06 11:42:49,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:49,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2021-05-06 11:42:49,666 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 56 [2021-05-06 11:42:49,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:49,666 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2021-05-06 11:42:49,666 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.625) internal successors, (52), 31 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:49,666 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2021-05-06 11:42:49,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-06 11:42:49,667 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:49,667 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:49,667 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-05-06 11:42:49,667 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:49,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:49,668 INFO L82 PathProgramCache]: Analyzing trace with hash 1800740933, now seen corresponding path program 15 times [2021-05-06 11:42:49,668 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:49,668 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [558031760] [2021-05-06 11:42:49,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:49,678 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:42:49,680 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:49,682 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:49,708 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:42:49,712 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:42:49,745 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:42:49,779 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 11:42:49,788 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:42:49,789 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:49,809 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:42:49,837 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:42:49,861 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 11:42:49,863 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:49,866 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:42:49,867 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:49,870 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:49,983 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 1 [2021-05-06 11:42:49,997 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:42:50,000 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:42:50,025 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:42:50,042 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 11:42:50,043 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:50,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:50,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:50,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:50,103 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:42:50,107 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:50,568 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:50,568 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [558031760] [2021-05-06 11:42:50,568 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [558031760] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:50,568 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:50,568 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 11:42:50,568 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730430101] [2021-05-06 11:42:50,568 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 11:42:50,568 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:50,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 11:42:50,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:42:50,569 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 19 states, 19 states have (on average 2.8947368421052633) internal successors, (55), 18 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:51,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:51,284 INFO L93 Difference]: Finished difference Result 73 states and 77 transitions. [2021-05-06 11:42:51,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 11:42:51,285 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.8947368421052633) internal successors, (55), 18 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-06 11:42:51,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:51,285 INFO L225 Difference]: With dead ends: 73 [2021-05-06 11:42:51,285 INFO L226 Difference]: Without dead ends: 65 [2021-05-06 11:42:51,286 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 10 SyntacticMatches, 32 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 811.2ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 11:42:51,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-06 11:42:51,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2021-05-06 11:42:51,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 59 states have (on average 1.0508474576271187) internal successors, (62), 59 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 11:42:51,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2021-05-06 11:42:51,296 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 59 [2021-05-06 11:42:51,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:51,296 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2021-05-06 11:42:51,296 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.8947368421052633) internal successors, (55), 18 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:51,296 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2021-05-06 11:42:51,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-06 11:42:51,296 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:51,297 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:51,297 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2021-05-06 11:42:51,297 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:51,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:51,297 INFO L82 PathProgramCache]: Analyzing trace with hash -2105498611, now seen corresponding path program 16 times [2021-05-06 11:42:51,297 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:51,297 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1841682086] [2021-05-06 11:42:51,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:51,305 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:42:51,321 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:51,323 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:52,515 WARN L205 SmtUtils]: Spent 1.19 s on a formula simplification. DAG size of input: 14 DAG size of output: 1 [2021-05-06 11:42:52,528 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:42:52,531 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:42:52,544 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:42:52,568 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 11:42:52,572 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:42:52,573 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:52,587 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:42:52,610 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:42:52,626 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 11:42:52,627 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:52,643 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:42:52,661 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:52,663 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:52,688 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:42:52,691 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:42:52,703 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:42:52,720 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 11:42:52,721 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:52,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:52,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:52,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:52,792 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:42:52,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:53,264 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:53,264 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1841682086] [2021-05-06 11:42:53,264 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1841682086] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:53,264 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:53,264 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 11:42:53,264 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [439912449] [2021-05-06 11:42:53,265 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 11:42:53,265 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:53,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 11:42:53,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:42:53,265 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand has 20 states, 20 states have (on average 2.9) internal successors, (58), 19 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 11:42:54,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:54,050 INFO L93 Difference]: Finished difference Result 76 states and 80 transitions. [2021-05-06 11:42:54,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 11:42:54,050 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.9) internal successors, (58), 19 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 11:42:54,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:54,050 INFO L225 Difference]: With dead ends: 76 [2021-05-06 11:42:54,051 INFO L226 Difference]: Without dead ends: 68 [2021-05-06 11:42:54,051 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 10 SyntacticMatches, 34 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 856.9ms TimeCoverageRelationStatistics Valid=141, Invalid=1265, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 11:42:54,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-06 11:42:54,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2021-05-06 11:42:54,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.0483870967741935) internal successors, (65), 62 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:54,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2021-05-06 11:42:54,060 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 62 [2021-05-06 11:42:54,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:54,060 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2021-05-06 11:42:54,060 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.9) internal successors, (58), 19 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 11:42:54,060 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2021-05-06 11:42:54,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-06 11:42:54,060 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:54,060 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:54,060 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2021-05-06 11:42:54,060 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:54,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:54,061 INFO L82 PathProgramCache]: Analyzing trace with hash -748868795, now seen corresponding path program 17 times [2021-05-06 11:42:54,061 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:54,061 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [567452107] [2021-05-06 11:42:54,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:54,068 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:42:54,089 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:54,091 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:54,119 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:42:54,122 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:42:54,135 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:42:54,157 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 11:42:54,160 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:42:54,175 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:54,196 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:42:54,206 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:42:54,222 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 11:42:54,223 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:54,226 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:42:54,240 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:54,242 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:54,285 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:42:54,289 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:42:54,301 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:42:54,318 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 11:42:54,319 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:54,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:54,394 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:54,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:54,400 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:42:54,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:54,944 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:54,945 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [567452107] [2021-05-06 11:42:54,945 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [567452107] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:54,945 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:54,945 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:42:54,945 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789687547] [2021-05-06 11:42:54,945 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:42:54,945 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:54,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:42:54,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:42:54,946 INFO L87 Difference]: Start difference. First operand 67 states and 69 transitions. Second operand has 21 states, 21 states have (on average 2.9047619047619047) internal successors, (61), 20 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:55,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:55,806 INFO L93 Difference]: Finished difference Result 79 states and 83 transitions. [2021-05-06 11:42:55,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:42:55,806 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.9047619047619047) internal successors, (61), 20 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-05-06 11:42:55,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:55,807 INFO L225 Difference]: With dead ends: 79 [2021-05-06 11:42:55,807 INFO L226 Difference]: Without dead ends: 71 [2021-05-06 11:42:55,807 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 10 SyntacticMatches, 36 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 206 ImplicationChecksByTransitivity, 957.1ms TimeCoverageRelationStatistics Valid=149, Invalid=1411, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 11:42:55,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-06 11:42:55,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2021-05-06 11:42:55,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 65 states have (on average 1.0461538461538462) internal successors, (68), 65 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:55,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2021-05-06 11:42:55,816 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 65 [2021-05-06 11:42:55,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:55,817 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2021-05-06 11:42:55,817 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.9047619047619047) internal successors, (61), 20 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:55,817 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2021-05-06 11:42:55,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-06 11:42:55,817 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:55,817 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:55,817 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2021-05-06 11:42:55,817 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:55,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:55,818 INFO L82 PathProgramCache]: Analyzing trace with hash -1032275699, now seen corresponding path program 18 times [2021-05-06 11:42:55,818 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:55,818 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1013464740] [2021-05-06 11:42:55,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:55,826 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:42:55,842 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:55,843 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:55,955 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 1 [2021-05-06 11:42:55,974 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:42:55,978 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:42:55,991 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:42:56,013 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 11:42:56,017 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:42:56,018 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:56,033 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:42:56,053 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:42:56,070 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 11:42:56,071 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:56,074 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:42:56,089 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:56,101 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:56,145 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:42:56,149 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:42:56,176 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:42:56,200 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 11:42:56,202 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:56,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:56,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:56,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:56,267 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:42:56,269 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:56,833 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:56,833 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1013464740] [2021-05-06 11:42:56,834 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1013464740] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:56,834 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:56,834 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:42:56,834 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077650042] [2021-05-06 11:42:56,834 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:42:56,834 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:56,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:42:56,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:42:56,835 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand has 22 states, 22 states have (on average 2.909090909090909) internal successors, (64), 21 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:57,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:42:57,787 INFO L93 Difference]: Finished difference Result 82 states and 86 transitions. [2021-05-06 11:42:57,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 11:42:57,788 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.909090909090909) internal successors, (64), 21 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 68 [2021-05-06 11:42:57,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:42:57,788 INFO L225 Difference]: With dead ends: 82 [2021-05-06 11:42:57,788 INFO L226 Difference]: Without dead ends: 74 [2021-05-06 11:42:57,789 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 10 SyntacticMatches, 38 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 1035.0ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 11:42:57,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-06 11:42:57,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2021-05-06 11:42:57,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 68 states have internal predecessors, (71), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:57,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2021-05-06 11:42:57,797 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 68 [2021-05-06 11:42:57,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:42:57,797 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2021-05-06 11:42:57,797 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.909090909090909) internal successors, (64), 21 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:42:57,797 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2021-05-06 11:42:57,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-06 11:42:57,798 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:42:57,798 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:42:57,798 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2021-05-06 11:42:57,798 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:42:57,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:42:57,799 INFO L82 PathProgramCache]: Analyzing trace with hash -101648827, now seen corresponding path program 19 times [2021-05-06 11:42:57,799 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:42:57,799 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2072133025] [2021-05-06 11:42:57,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:42:57,818 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:42:57,819 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:57,821 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:57,864 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:42:57,866 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:42:57,902 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:42:57,927 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 11:42:57,932 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:42:57,933 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:57,950 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:42:57,970 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:42:57,986 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 11:42:57,988 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:57,993 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:42:57,994 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:57,995 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:42:58,026 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:42:58,029 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:42:58,058 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:42:58,074 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 11:42:58,075 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:42:58,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:58,155 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:42:58,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:42:58,165 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:42:58,168 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:42:59,414 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:42:59,414 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2072133025] [2021-05-06 11:42:59,414 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2072133025] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:42:59,414 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:42:59,414 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-06 11:42:59,414 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [816869623] [2021-05-06 11:42:59,414 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 11:42:59,414 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:42:59,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 11:42:59,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1684, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 11:42:59,415 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand has 42 states, 42 states have (on average 1.5952380952380953) internal successors, (67), 41 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:01,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:01,753 INFO L93 Difference]: Finished difference Result 84 states and 88 transitions. [2021-05-06 11:43:01,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-06 11:43:01,755 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.5952380952380953) internal successors, (67), 41 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 71 [2021-05-06 11:43:01,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:01,755 INFO L225 Difference]: With dead ends: 84 [2021-05-06 11:43:01,755 INFO L226 Difference]: Without dead ends: 76 [2021-05-06 11:43:01,756 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 9 SyntacticMatches, 22 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 800 ImplicationChecksByTransitivity, 2643.6ms TimeCoverageRelationStatistics Valid=317, Invalid=6325, Unknown=0, NotChecked=0, Total=6642 [2021-05-06 11:43:01,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-06 11:43:01,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2021-05-06 11:43:01,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.0422535211267605) internal successors, (74), 71 states have internal predecessors, (74), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:01,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2021-05-06 11:43:01,767 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 71 [2021-05-06 11:43:01,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:01,768 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2021-05-06 11:43:01,768 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 1.5952380952380953) internal successors, (67), 41 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:01,768 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2021-05-06 11:43:01,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-06 11:43:01,768 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:01,768 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:43:01,769 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2021-05-06 11:43:01,769 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:01,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:01,769 INFO L82 PathProgramCache]: Analyzing trace with hash 189599245, now seen corresponding path program 20 times [2021-05-06 11:43:01,769 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:01,769 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [19418004] [2021-05-06 11:43:01,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:01,776 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:43:01,792 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:01,794 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:01,849 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:43:01,852 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:43:01,864 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:43:01,885 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 11:43:01,888 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:43:01,900 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:01,911 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:43:01,920 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:43:01,936 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 11:43:01,937 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:01,940 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:43:01,956 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:01,958 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:01,983 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:43:01,986 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:43:02,003 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:43:02,020 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 11:43:02,021 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:02,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:02,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:02,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:02,094 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:43:02,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:02,775 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:02,776 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [19418004] [2021-05-06 11:43:02,776 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [19418004] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:02,776 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:02,776 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:43:02,776 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126521773] [2021-05-06 11:43:02,776 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:43:02,776 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:02,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:43:02,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:43:02,777 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand has 24 states, 24 states have (on average 2.9166666666666665) internal successors, (70), 23 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:03,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:03,887 INFO L93 Difference]: Finished difference Result 88 states and 92 transitions. [2021-05-06 11:43:03,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 11:43:03,888 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.9166666666666665) internal successors, (70), 23 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2021-05-06 11:43:03,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:03,889 INFO L225 Difference]: With dead ends: 88 [2021-05-06 11:43:03,889 INFO L226 Difference]: Without dead ends: 80 [2021-05-06 11:43:03,889 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 9 SyntacticMatches, 43 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 272 ImplicationChecksByTransitivity, 1215.5ms TimeCoverageRelationStatistics Valid=173, Invalid=1897, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 11:43:03,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-05-06 11:43:03,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2021-05-06 11:43:03,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.0405405405405406) internal successors, (77), 74 states have internal predecessors, (77), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:03,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 81 transitions. [2021-05-06 11:43:03,906 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 81 transitions. Word has length 74 [2021-05-06 11:43:03,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:03,907 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 81 transitions. [2021-05-06 11:43:03,907 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.9166666666666665) internal successors, (70), 23 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:03,907 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 81 transitions. [2021-05-06 11:43:03,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 11:43:03,907 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:03,907 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:43:03,907 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2021-05-06 11:43:03,907 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:03,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:03,908 INFO L82 PathProgramCache]: Analyzing trace with hash 926974277, now seen corresponding path program 21 times [2021-05-06 11:43:03,908 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:03,908 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [68391123] [2021-05-06 11:43:03,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:03,919 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:43:03,919 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:03,921 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:03,984 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:43:03,988 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:43:04,012 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:43:04,034 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 11:43:04,045 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:43:04,060 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:04,075 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:43:04,084 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:43:04,100 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 11:43:04,101 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:04,108 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:43:04,109 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:04,110 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:04,147 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:43:04,150 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:43:04,176 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:43:04,192 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 11:43:04,193 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:04,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:04,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:04,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:04,277 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:43:04,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:05,116 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:05,117 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [68391123] [2021-05-06 11:43:05,117 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [68391123] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:05,117 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:05,117 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 11:43:05,117 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188498333] [2021-05-06 11:43:05,117 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 11:43:05,117 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:05,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 11:43:05,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:43:05,118 INFO L87 Difference]: Start difference. First operand 79 states and 81 transitions. Second operand has 25 states, 25 states have (on average 2.92) internal successors, (73), 24 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:06,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:06,307 INFO L93 Difference]: Finished difference Result 91 states and 95 transitions. [2021-05-06 11:43:06,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 11:43:06,308 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.92) internal successors, (73), 24 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2021-05-06 11:43:06,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:06,308 INFO L225 Difference]: With dead ends: 91 [2021-05-06 11:43:06,308 INFO L226 Difference]: Without dead ends: 83 [2021-05-06 11:43:06,309 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 9 SyntacticMatches, 45 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 296 ImplicationChecksByTransitivity, 1396.0ms TimeCoverageRelationStatistics Valid=181, Invalid=2075, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 11:43:06,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-06 11:43:06,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 82. [2021-05-06 11:43:06,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 77 states have (on average 1.0389610389610389) internal successors, (80), 77 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 11:43:06,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2021-05-06 11:43:06,319 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 77 [2021-05-06 11:43:06,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:06,319 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2021-05-06 11:43:06,319 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.92) internal successors, (73), 24 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:06,319 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2021-05-06 11:43:06,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-06 11:43:06,320 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:06,320 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:43:06,320 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2021-05-06 11:43:06,320 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:06,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:06,320 INFO L82 PathProgramCache]: Analyzing trace with hash -691166451, now seen corresponding path program 22 times [2021-05-06 11:43:06,320 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:06,320 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [892229679] [2021-05-06 11:43:06,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:06,338 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:43:06,339 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:06,340 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:06,622 WARN L205 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:43:06,634 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:43:06,638 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:43:06,667 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:43:06,695 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 11:43:06,699 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:43:06,710 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:06,721 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:43:06,731 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:43:06,750 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 11:43:06,751 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:06,755 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:43:06,755 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:06,757 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:06,868 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 1 [2021-05-06 11:43:06,888 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:43:06,891 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:43:06,919 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:43:06,936 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 11:43:06,937 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:06,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:06,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:06,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:06,999 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:43:07,003 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:07,862 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:07,862 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [892229679] [2021-05-06 11:43:07,862 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [892229679] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:07,862 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:07,862 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:43:07,863 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2113394282] [2021-05-06 11:43:07,863 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:43:07,863 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:07,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:43:07,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:43:07,864 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand has 26 states, 26 states have (on average 2.923076923076923) internal successors, (76), 25 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:09,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:09,119 INFO L93 Difference]: Finished difference Result 94 states and 98 transitions. [2021-05-06 11:43:09,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 11:43:09,120 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.923076923076923) internal successors, (76), 25 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 80 [2021-05-06 11:43:09,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:09,120 INFO L225 Difference]: With dead ends: 94 [2021-05-06 11:43:09,120 INFO L226 Difference]: Without dead ends: 86 [2021-05-06 11:43:09,121 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 9 SyntacticMatches, 47 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 321 ImplicationChecksByTransitivity, 1426.8ms TimeCoverageRelationStatistics Valid=189, Invalid=2261, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 11:43:09,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-06 11:43:09,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2021-05-06 11:43:09,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.0375) internal successors, (83), 80 states have internal predecessors, (83), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:09,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2021-05-06 11:43:09,132 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 80 [2021-05-06 11:43:09,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:09,132 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2021-05-06 11:43:09,132 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.923076923076923) internal successors, (76), 25 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:09,132 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2021-05-06 11:43:09,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-06 11:43:09,132 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:09,133 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:43:09,133 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68 [2021-05-06 11:43:09,133 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:09,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:09,133 INFO L82 PathProgramCache]: Analyzing trace with hash -8663995, now seen corresponding path program 23 times [2021-05-06 11:43:09,133 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:09,133 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [588981842] [2021-05-06 11:43:09,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:09,141 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:43:09,157 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:09,158 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:09,194 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:43:09,197 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:43:09,209 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:43:09,231 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 11:43:09,236 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:43:09,252 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:09,275 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:43:09,287 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:43:09,308 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 11:43:09,309 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:09,311 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:43:09,332 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:09,334 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:09,679 WARN L205 SmtUtils]: Spent 342.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 1 [2021-05-06 11:43:09,696 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:43:09,699 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:43:09,712 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:43:09,727 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 11:43:09,728 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:09,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:09,788 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:09,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:09,791 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:43:09,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:10,721 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:10,722 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [588981842] [2021-05-06 11:43:10,722 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [588981842] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:10,722 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:10,722 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 11:43:10,722 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262662065] [2021-05-06 11:43:10,722 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 11:43:10,722 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:10,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 11:43:10,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-06 11:43:10,723 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 27 states, 27 states have (on average 2.925925925925926) internal successors, (79), 26 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:12,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:12,051 INFO L93 Difference]: Finished difference Result 97 states and 101 transitions. [2021-05-06 11:43:12,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 11:43:12,052 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.925925925925926) internal successors, (79), 26 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2021-05-06 11:43:12,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:12,052 INFO L225 Difference]: With dead ends: 97 [2021-05-06 11:43:12,053 INFO L226 Difference]: Without dead ends: 89 [2021-05-06 11:43:12,053 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 10 SyntacticMatches, 48 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 347 ImplicationChecksByTransitivity, 1500.9ms TimeCoverageRelationStatistics Valid=197, Invalid=2455, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 11:43:12,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-06 11:43:12,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2021-05-06 11:43:12,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 83 states have (on average 1.036144578313253) internal successors, (86), 83 states have internal predecessors, (86), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:12,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2021-05-06 11:43:12,067 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 83 [2021-05-06 11:43:12,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:12,068 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2021-05-06 11:43:12,068 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.925925925925926) internal successors, (79), 26 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:12,068 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2021-05-06 11:43:12,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-06 11:43:12,068 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:12,068 INFO L523 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:43:12,068 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71 [2021-05-06 11:43:12,068 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:12,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:12,069 INFO L82 PathProgramCache]: Analyzing trace with hash 46823437, now seen corresponding path program 24 times [2021-05-06 11:43:12,069 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:12,069 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [561197447] [2021-05-06 11:43:12,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:12,076 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:43:12,094 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:12,096 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:12,157 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:43:12,161 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:43:12,174 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:43:12,194 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 11:43:12,197 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:43:12,208 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:12,220 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:43:12,229 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:43:12,245 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 11:43:12,246 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:12,256 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:43:12,257 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:12,260 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:12,288 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:43:12,293 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:43:12,326 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:43:12,343 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 11:43:12,349 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:12,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:12,411 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:12,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:12,418 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:43:12,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:13,429 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:13,429 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [561197447] [2021-05-06 11:43:13,429 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [561197447] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:13,429 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:13,429 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 11:43:13,429 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667447969] [2021-05-06 11:43:13,429 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 11:43:13,430 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:13,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 11:43:13,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:43:13,430 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand has 28 states, 28 states have (on average 2.9285714285714284) internal successors, (82), 27 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:14,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:14,888 INFO L93 Difference]: Finished difference Result 100 states and 104 transitions. [2021-05-06 11:43:14,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 11:43:14,889 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.9285714285714284) internal successors, (82), 27 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 86 [2021-05-06 11:43:14,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:14,889 INFO L225 Difference]: With dead ends: 100 [2021-05-06 11:43:14,889 INFO L226 Difference]: Without dead ends: 92 [2021-05-06 11:43:14,890 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 10 SyntacticMatches, 50 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 1665.0ms TimeCoverageRelationStatistics Valid=205, Invalid=2657, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 11:43:14,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-06 11:43:14,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2021-05-06 11:43:14,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.0348837209302326) internal successors, (89), 86 states have internal predecessors, (89), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:14,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 93 transitions. [2021-05-06 11:43:14,901 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 93 transitions. Word has length 86 [2021-05-06 11:43:14,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:14,901 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 93 transitions. [2021-05-06 11:43:14,901 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 2.9285714285714284) internal successors, (82), 27 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:14,901 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 93 transitions. [2021-05-06 11:43:14,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-06 11:43:14,901 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:14,902 INFO L523 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:43:14,902 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74 [2021-05-06 11:43:14,902 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:14,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:14,902 INFO L82 PathProgramCache]: Analyzing trace with hash -489498811, now seen corresponding path program 25 times [2021-05-06 11:43:14,902 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:14,902 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [990830460] [2021-05-06 11:43:14,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:14,911 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:43:14,943 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:14,945 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:15,045 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:43:15,048 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:43:15,061 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:43:15,086 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 11:43:15,090 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:43:15,101 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:15,113 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:43:15,123 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:43:15,139 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 11:43:15,140 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:15,153 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:43:15,175 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:15,177 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:15,205 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:43:15,210 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:43:15,222 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:43:15,240 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 11:43:15,241 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:15,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:15,311 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:15,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:15,314 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:43:15,316 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:16,329 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:16,329 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [990830460] [2021-05-06 11:43:16,329 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [990830460] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:16,329 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:16,329 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 11:43:16,329 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932754516] [2021-05-06 11:43:16,329 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 11:43:16,330 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:16,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 11:43:16,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:43:16,330 INFO L87 Difference]: Start difference. First operand 91 states and 93 transitions. Second operand has 29 states, 29 states have (on average 2.9310344827586206) internal successors, (85), 28 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:17,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:17,981 INFO L93 Difference]: Finished difference Result 103 states and 107 transitions. [2021-05-06 11:43:17,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 11:43:17,982 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.9310344827586206) internal successors, (85), 28 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 89 [2021-05-06 11:43:17,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:17,982 INFO L225 Difference]: With dead ends: 103 [2021-05-06 11:43:17,982 INFO L226 Difference]: Without dead ends: 95 [2021-05-06 11:43:17,983 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 9 SyntacticMatches, 53 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 402 ImplicationChecksByTransitivity, 1754.8ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 11:43:17,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-06 11:43:17,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2021-05-06 11:43:17,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 89 states have (on average 1.0337078651685394) internal successors, (92), 89 states have internal predecessors, (92), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:17,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 96 transitions. [2021-05-06 11:43:17,996 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 96 transitions. Word has length 89 [2021-05-06 11:43:17,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:17,997 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 96 transitions. [2021-05-06 11:43:17,997 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.9310344827586206) internal successors, (85), 28 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:17,997 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 96 transitions. [2021-05-06 11:43:17,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-05-06 11:43:17,997 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:17,997 INFO L523 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:43:17,998 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77 [2021-05-06 11:43:17,998 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:17,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:17,998 INFO L82 PathProgramCache]: Analyzing trace with hash -787247859, now seen corresponding path program 26 times [2021-05-06 11:43:17,998 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:17,998 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [179047688] [2021-05-06 11:43:17,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:18,008 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:43:18,027 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:18,028 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:18,051 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:43:18,054 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:43:18,067 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:43:18,088 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 11:43:18,102 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:43:18,113 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:18,126 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:43:18,136 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:43:18,155 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 11:43:18,156 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:18,158 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:43:18,159 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:18,161 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:18,214 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:43:18,217 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:43:18,247 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:43:18,266 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 11:43:18,267 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:18,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:18,337 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:18,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:18,344 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:43:18,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:19,460 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:19,461 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [179047688] [2021-05-06 11:43:19,461 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [179047688] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:19,461 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:19,461 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 11:43:19,461 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459476809] [2021-05-06 11:43:19,461 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 11:43:19,461 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:19,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 11:43:19,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:43:19,462 INFO L87 Difference]: Start difference. First operand 94 states and 96 transitions. Second operand has 30 states, 30 states have (on average 2.933333333333333) internal successors, (88), 29 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:21,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:21,098 INFO L93 Difference]: Finished difference Result 106 states and 110 transitions. [2021-05-06 11:43:21,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 11:43:21,099 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.933333333333333) internal successors, (88), 29 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 92 [2021-05-06 11:43:21,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:21,099 INFO L225 Difference]: With dead ends: 106 [2021-05-06 11:43:21,099 INFO L226 Difference]: Without dead ends: 98 [2021-05-06 11:43:21,100 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 9 SyntacticMatches, 55 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 431 ImplicationChecksByTransitivity, 1829.6ms TimeCoverageRelationStatistics Valid=221, Invalid=3085, Unknown=0, NotChecked=0, Total=3306 [2021-05-06 11:43:21,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-06 11:43:21,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2021-05-06 11:43:21,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 92 states have (on average 1.0326086956521738) internal successors, (95), 92 states have internal predecessors, (95), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:21,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 99 transitions. [2021-05-06 11:43:21,116 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 99 transitions. Word has length 92 [2021-05-06 11:43:21,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:21,116 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 99 transitions. [2021-05-06 11:43:21,116 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.933333333333333) internal successors, (88), 29 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:21,116 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 99 transitions. [2021-05-06 11:43:21,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-06 11:43:21,116 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:21,117 INFO L523 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:43:21,117 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80 [2021-05-06 11:43:21,117 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:21,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:21,117 INFO L82 PathProgramCache]: Analyzing trace with hash -1921670587, now seen corresponding path program 27 times [2021-05-06 11:43:21,117 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:21,117 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2139623883] [2021-05-06 11:43:21,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:21,125 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:43:21,126 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:21,127 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:21,148 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:43:21,151 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:43:21,176 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:43:21,198 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 11:43:21,209 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:43:21,210 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:21,220 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:43:21,239 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:43:21,256 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 11:43:21,257 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:21,259 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:43:21,260 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:21,261 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:21,298 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:43:21,302 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:43:21,335 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:43:21,358 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 11:43:21,361 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:21,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:21,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:21,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:21,455 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:43:21,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:22,688 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:22,689 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2139623883] [2021-05-06 11:43:22,689 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2139623883] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:22,689 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:22,689 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 11:43:22,689 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601182126] [2021-05-06 11:43:22,689 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 11:43:22,689 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:22,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 11:43:22,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-06 11:43:22,690 INFO L87 Difference]: Start difference. First operand 97 states and 99 transitions. Second operand has 31 states, 31 states have (on average 2.935483870967742) internal successors, (91), 30 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:24,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:24,411 INFO L93 Difference]: Finished difference Result 109 states and 113 transitions. [2021-05-06 11:43:24,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 11:43:24,412 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.935483870967742) internal successors, (91), 30 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 95 [2021-05-06 11:43:24,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:24,412 INFO L225 Difference]: With dead ends: 109 [2021-05-06 11:43:24,412 INFO L226 Difference]: Without dead ends: 101 [2021-05-06 11:43:24,413 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 9 SyntacticMatches, 57 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 461 ImplicationChecksByTransitivity, 2013.2ms TimeCoverageRelationStatistics Valid=229, Invalid=3311, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 11:43:24,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-05-06 11:43:24,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 100. [2021-05-06 11:43:24,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 95 states have (on average 1.0315789473684212) internal successors, (98), 95 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 11:43:24,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 102 transitions. [2021-05-06 11:43:24,427 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 102 transitions. Word has length 95 [2021-05-06 11:43:24,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:24,428 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 102 transitions. [2021-05-06 11:43:24,428 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.935483870967742) internal successors, (91), 30 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:24,428 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 102 transitions. [2021-05-06 11:43:24,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-05-06 11:43:24,428 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:24,428 INFO L523 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:43:24,428 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83 [2021-05-06 11:43:24,428 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:24,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:24,429 INFO L82 PathProgramCache]: Analyzing trace with hash -411508211, now seen corresponding path program 28 times [2021-05-06 11:43:24,429 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:24,429 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [817712337] [2021-05-06 11:43:24,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:24,435 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:43:24,436 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:24,437 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:24,483 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:43:24,487 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:43:24,512 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:43:24,533 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 11:43:24,537 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:43:24,547 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:24,565 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:43:24,574 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:43:24,591 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 11:43:24,592 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:24,594 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:43:24,595 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:24,597 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:24,627 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:43:24,630 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:43:24,663 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:43:24,684 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 11:43:24,686 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:24,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:24,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:24,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:24,759 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:43:24,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:25,993 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:25,994 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [817712337] [2021-05-06 11:43:25,994 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [817712337] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:25,994 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:25,994 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 11:43:25,994 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305775630] [2021-05-06 11:43:25,994 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 11:43:25,994 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:25,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 11:43:25,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:43:25,995 INFO L87 Difference]: Start difference. First operand 100 states and 102 transitions. Second operand has 32 states, 32 states have (on average 2.9375) internal successors, (94), 31 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 11:43:27,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:27,849 INFO L93 Difference]: Finished difference Result 112 states and 116 transitions. [2021-05-06 11:43:27,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 11:43:27,849 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.9375) internal successors, (94), 31 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 11:43:27,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:27,850 INFO L225 Difference]: With dead ends: 112 [2021-05-06 11:43:27,850 INFO L226 Difference]: Without dead ends: 104 [2021-05-06 11:43:27,851 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 9 SyntacticMatches, 59 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 492 ImplicationChecksByTransitivity, 2061.5ms TimeCoverageRelationStatistics Valid=237, Invalid=3545, Unknown=0, NotChecked=0, Total=3782 [2021-05-06 11:43:27,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-05-06 11:43:27,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2021-05-06 11:43:27,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.030612244897959) internal successors, (101), 98 states have internal predecessors, (101), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:27,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 105 transitions. [2021-05-06 11:43:27,868 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 105 transitions. Word has length 98 [2021-05-06 11:43:27,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:27,868 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 105 transitions. [2021-05-06 11:43:27,868 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.9375) internal successors, (94), 31 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 11:43:27,868 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 105 transitions. [2021-05-06 11:43:27,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-06 11:43:27,869 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:27,869 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:43:27,869 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86 [2021-05-06 11:43:27,869 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:27,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:27,869 INFO L82 PathProgramCache]: Analyzing trace with hash -946590395, now seen corresponding path program 29 times [2021-05-06 11:43:27,870 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:27,870 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1937402931] [2021-05-06 11:43:27,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:27,878 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:43:27,879 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:27,881 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:27,952 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:43:27,955 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:43:27,980 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:43:28,001 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 11:43:28,005 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:43:28,005 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:28,025 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:43:28,045 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:43:28,061 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 11:43:28,062 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:28,065 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:43:28,081 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:28,082 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:28,176 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:43:28,180 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:43:28,192 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:43:28,211 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 11:43:28,212 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:28,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:28,262 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:28,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:28,274 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:43:28,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:29,607 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:29,607 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1937402931] [2021-05-06 11:43:29,607 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1937402931] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:29,607 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:29,607 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 11:43:29,607 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492552882] [2021-05-06 11:43:29,608 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 11:43:29,608 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:29,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 11:43:29,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 11:43:29,609 INFO L87 Difference]: Start difference. First operand 103 states and 105 transitions. Second operand has 33 states, 33 states have (on average 2.9393939393939394) internal successors, (97), 32 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:31,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:31,584 INFO L93 Difference]: Finished difference Result 115 states and 119 transitions. [2021-05-06 11:43:31,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 11:43:31,584 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.9393939393939394) internal successors, (97), 32 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2021-05-06 11:43:31,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:31,585 INFO L225 Difference]: With dead ends: 115 [2021-05-06 11:43:31,585 INFO L226 Difference]: Without dead ends: 107 [2021-05-06 11:43:31,586 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 10 SyntacticMatches, 60 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 524 ImplicationChecksByTransitivity, 2187.7ms TimeCoverageRelationStatistics Valid=245, Invalid=3787, Unknown=0, NotChecked=0, Total=4032 [2021-05-06 11:43:31,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-05-06 11:43:31,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2021-05-06 11:43:31,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 101 states have (on average 1.0297029702970297) internal successors, (104), 101 states have internal predecessors, (104), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:31,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 108 transitions. [2021-05-06 11:43:31,605 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 108 transitions. Word has length 101 [2021-05-06 11:43:31,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:31,605 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 108 transitions. [2021-05-06 11:43:31,605 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.9393939393939394) internal successors, (97), 32 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:31,605 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 108 transitions. [2021-05-06 11:43:31,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-05-06 11:43:31,606 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:31,606 INFO L523 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:43:31,606 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable89 [2021-05-06 11:43:31,606 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:31,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:31,606 INFO L82 PathProgramCache]: Analyzing trace with hash 1338668813, now seen corresponding path program 30 times [2021-05-06 11:43:31,606 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:31,606 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [41043472] [2021-05-06 11:43:31,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:31,613 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:43:31,628 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:31,629 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:31,653 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:43:31,656 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:43:31,669 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:43:31,690 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 11:43:31,702 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:43:31,718 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:31,730 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:43:31,740 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:43:31,757 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 11:43:31,765 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:31,768 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:43:31,769 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:31,770 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:31,830 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:43:31,834 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:43:31,875 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:43:31,898 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 11:43:31,899 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:31,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:31,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:31,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:31,966 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:43:31,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:33,329 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:33,330 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [41043472] [2021-05-06 11:43:33,330 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [41043472] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:33,330 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:33,330 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 11:43:33,330 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916410629] [2021-05-06 11:43:33,330 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 11:43:33,330 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:33,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 11:43:33,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:43:33,331 INFO L87 Difference]: Start difference. First operand 106 states and 108 transitions. Second operand has 34 states, 34 states have (on average 2.9411764705882355) internal successors, (100), 33 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:35,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:35,385 INFO L93 Difference]: Finished difference Result 118 states and 122 transitions. [2021-05-06 11:43:35,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 11:43:35,385 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.9411764705882355) internal successors, (100), 33 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 104 [2021-05-06 11:43:35,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:35,386 INFO L225 Difference]: With dead ends: 118 [2021-05-06 11:43:35,386 INFO L226 Difference]: Without dead ends: 110 [2021-05-06 11:43:35,386 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 9 SyntacticMatches, 63 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 557 ImplicationChecksByTransitivity, 2259.7ms TimeCoverageRelationStatistics Valid=253, Invalid=4037, Unknown=0, NotChecked=0, Total=4290 [2021-05-06 11:43:35,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-06 11:43:35,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2021-05-06 11:43:35,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.0288461538461537) internal successors, (107), 104 states have internal predecessors, (107), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:35,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2021-05-06 11:43:35,399 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 104 [2021-05-06 11:43:35,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:35,400 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2021-05-06 11:43:35,400 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.9411764705882355) internal successors, (100), 33 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:35,400 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2021-05-06 11:43:35,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-06 11:43:35,400 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:35,400 INFO L523 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:43:35,401 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92 [2021-05-06 11:43:35,401 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:35,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:35,401 INFO L82 PathProgramCache]: Analyzing trace with hash 1969125445, now seen corresponding path program 31 times [2021-05-06 11:43:35,401 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:35,401 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1594945214] [2021-05-06 11:43:35,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:35,425 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:43:35,426 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:35,428 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:35,507 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:43:35,510 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:43:35,536 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:43:35,560 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 11:43:35,564 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:43:35,591 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:35,607 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:43:35,620 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:43:35,637 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 11:43:35,638 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:35,644 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:43:35,660 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:35,662 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:35,749 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:43:35,752 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:43:35,766 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:43:35,797 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 11:43:35,798 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:35,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:35,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:35,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:35,856 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:43:35,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:37,325 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:37,325 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1594945214] [2021-05-06 11:43:37,325 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1594945214] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:37,325 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:37,325 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 11:43:37,325 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842276640] [2021-05-06 11:43:37,326 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 11:43:37,326 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:37,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 11:43:37,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 11:43:37,326 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 35 states, 35 states have (on average 2.942857142857143) internal successors, (103), 34 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:39,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:39,503 INFO L93 Difference]: Finished difference Result 121 states and 125 transitions. [2021-05-06 11:43:39,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 11:43:39,503 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.942857142857143) internal successors, (103), 34 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 107 [2021-05-06 11:43:39,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:39,504 INFO L225 Difference]: With dead ends: 121 [2021-05-06 11:43:39,504 INFO L226 Difference]: Without dead ends: 113 [2021-05-06 11:43:39,504 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 9 SyntacticMatches, 65 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 591 ImplicationChecksByTransitivity, 2386.5ms TimeCoverageRelationStatistics Valid=261, Invalid=4295, Unknown=0, NotChecked=0, Total=4556 [2021-05-06 11:43:39,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-05-06 11:43:39,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 112. [2021-05-06 11:43:39,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 107 states have (on average 1.02803738317757) internal successors, (110), 107 states have internal predecessors, (110), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:39,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 114 transitions. [2021-05-06 11:43:39,521 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 114 transitions. Word has length 107 [2021-05-06 11:43:39,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:39,521 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 114 transitions. [2021-05-06 11:43:39,521 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.942857142857143) internal successors, (103), 34 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:39,521 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 114 transitions. [2021-05-06 11:43:39,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-06 11:43:39,522 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:39,522 INFO L523 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:43:39,522 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95 [2021-05-06 11:43:39,522 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:39,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:39,522 INFO L82 PathProgramCache]: Analyzing trace with hash 2010663949, now seen corresponding path program 32 times [2021-05-06 11:43:39,522 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:39,522 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [804064328] [2021-05-06 11:43:39,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:39,530 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:43:39,549 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:39,559 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:39,582 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:43:39,585 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:43:39,599 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:43:39,620 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 11:43:39,624 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:43:39,635 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:39,649 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:43:39,658 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:43:39,674 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 11:43:39,675 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:39,681 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:43:39,698 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:39,709 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:39,738 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:43:39,741 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:43:39,753 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:43:39,770 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 11:43:39,771 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:39,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:39,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:39,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:39,828 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:43:39,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:41,370 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:41,370 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [804064328] [2021-05-06 11:43:41,370 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [804064328] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:41,370 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:41,370 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 11:43:41,370 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915871241] [2021-05-06 11:43:41,371 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 11:43:41,371 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:41,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 11:43:41,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 11:43:41,371 INFO L87 Difference]: Start difference. First operand 112 states and 114 transitions. Second operand has 36 states, 36 states have (on average 2.9444444444444446) internal successors, (106), 35 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:43,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:43,616 INFO L93 Difference]: Finished difference Result 124 states and 128 transitions. [2021-05-06 11:43:43,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 11:43:43,617 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.9444444444444446) internal successors, (106), 35 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 110 [2021-05-06 11:43:43,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:43,617 INFO L225 Difference]: With dead ends: 124 [2021-05-06 11:43:43,617 INFO L226 Difference]: Without dead ends: 116 [2021-05-06 11:43:43,618 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 10 SyntacticMatches, 66 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 626 ImplicationChecksByTransitivity, 2496.1ms TimeCoverageRelationStatistics Valid=269, Invalid=4561, Unknown=0, NotChecked=0, Total=4830 [2021-05-06 11:43:43,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-05-06 11:43:43,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2021-05-06 11:43:43,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.0272727272727273) internal successors, (113), 110 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 11:43:43,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 117 transitions. [2021-05-06 11:43:43,635 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 117 transitions. Word has length 110 [2021-05-06 11:43:43,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:43,635 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 117 transitions. [2021-05-06 11:43:43,635 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 2.9444444444444446) internal successors, (106), 35 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:43,635 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 117 transitions. [2021-05-06 11:43:43,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-06 11:43:43,636 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:43,636 INFO L523 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:43:43,636 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable98 [2021-05-06 11:43:43,636 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:43,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:43,637 INFO L82 PathProgramCache]: Analyzing trace with hash -1761311931, now seen corresponding path program 33 times [2021-05-06 11:43:43,637 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:43,637 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [298699875] [2021-05-06 11:43:43,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:43,644 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:43:43,645 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:43,647 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:43,890 WARN L205 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:43:43,902 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:43:43,906 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:43:43,932 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:43:43,953 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 11:43:43,963 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:43:43,964 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:43,975 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:43:43,994 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:43:44,011 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 11:43:44,012 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:44,022 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:43:44,038 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:44,039 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:44,106 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:43:44,109 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:43:44,124 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:43:44,140 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 11:43:44,141 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:44,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:44,195 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:44,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:44,199 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:43:44,202 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:45,818 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:45,818 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [298699875] [2021-05-06 11:43:45,818 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [298699875] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:45,818 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:45,818 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 11:43:45,818 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104940933] [2021-05-06 11:43:45,819 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 11:43:45,819 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:45,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 11:43:45,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 11:43:45,819 INFO L87 Difference]: Start difference. First operand 115 states and 117 transitions. Second operand has 37 states, 37 states have (on average 2.945945945945946) internal successors, (109), 36 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 11:43:48,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:48,247 INFO L93 Difference]: Finished difference Result 127 states and 131 transitions. [2021-05-06 11:43:48,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 11:43:48,247 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.945945945945946) internal successors, (109), 36 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 11:43:48,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:48,248 INFO L225 Difference]: With dead ends: 127 [2021-05-06 11:43:48,248 INFO L226 Difference]: Without dead ends: 119 [2021-05-06 11:43:48,249 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 9 SyntacticMatches, 69 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 662 ImplicationChecksByTransitivity, 2636.2ms TimeCoverageRelationStatistics Valid=277, Invalid=4835, Unknown=0, NotChecked=0, Total=5112 [2021-05-06 11:43:48,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-05-06 11:43:48,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 118. [2021-05-06 11:43:48,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 113 states have (on average 1.0265486725663717) internal successors, (116), 113 states have internal predecessors, (116), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:48,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 120 transitions. [2021-05-06 11:43:48,265 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 120 transitions. Word has length 113 [2021-05-06 11:43:48,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:48,265 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 120 transitions. [2021-05-06 11:43:48,265 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 2.945945945945946) internal successors, (109), 36 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 11:43:48,265 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 120 transitions. [2021-05-06 11:43:48,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-05-06 11:43:48,266 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:48,266 INFO L523 BasicCegarLoop]: trace histogram [35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:43:48,266 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable101 [2021-05-06 11:43:48,266 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:48,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:48,266 INFO L82 PathProgramCache]: Analyzing trace with hash 829579533, now seen corresponding path program 34 times [2021-05-06 11:43:48,267 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:48,267 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2102802054] [2021-05-06 11:43:48,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:48,275 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:43:48,276 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:48,278 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:48,306 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:43:48,310 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:43:48,335 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:43:48,358 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 11:43:48,362 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:43:48,376 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:48,389 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:43:48,398 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:43:48,415 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 11:43:48,416 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:48,418 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:43:48,433 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:48,435 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:48,453 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:43:48,456 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:43:48,469 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:43:48,485 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 11:43:48,486 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:48,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:48,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:48,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:48,545 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:43:48,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:50,267 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:50,267 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2102802054] [2021-05-06 11:43:50,267 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2102802054] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:50,267 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:50,267 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 11:43:50,267 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699833570] [2021-05-06 11:43:50,267 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 11:43:50,268 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:50,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 11:43:50,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 11:43:50,268 INFO L87 Difference]: Start difference. First operand 118 states and 120 transitions. Second operand has 38 states, 38 states have (on average 2.9473684210526314) internal successors, (112), 37 states have internal predecessors, (112), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:52,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:52,768 INFO L93 Difference]: Finished difference Result 130 states and 134 transitions. [2021-05-06 11:43:52,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 11:43:52,768 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.9473684210526314) internal successors, (112), 37 states have internal predecessors, (112), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 116 [2021-05-06 11:43:52,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:52,769 INFO L225 Difference]: With dead ends: 130 [2021-05-06 11:43:52,769 INFO L226 Difference]: Without dead ends: 122 [2021-05-06 11:43:52,769 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 10 SyntacticMatches, 70 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 699 ImplicationChecksByTransitivity, 2738.7ms TimeCoverageRelationStatistics Valid=285, Invalid=5117, Unknown=0, NotChecked=0, Total=5402 [2021-05-06 11:43:52,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-05-06 11:43:52,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2021-05-06 11:43:52,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 116 states have (on average 1.0258620689655173) internal successors, (119), 116 states have internal predecessors, (119), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:52,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 123 transitions. [2021-05-06 11:43:52,787 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 123 transitions. Word has length 116 [2021-05-06 11:43:52,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:52,787 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 123 transitions. [2021-05-06 11:43:52,788 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.9473684210526314) internal successors, (112), 37 states have internal predecessors, (112), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:52,788 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 123 transitions. [2021-05-06 11:43:52,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-05-06 11:43:52,788 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:52,788 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:43:52,788 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable104 [2021-05-06 11:43:52,788 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:52,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:52,789 INFO L82 PathProgramCache]: Analyzing trace with hash 1219907141, now seen corresponding path program 35 times [2021-05-06 11:43:52,789 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:52,789 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1275730753] [2021-05-06 11:43:52,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:52,795 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:43:52,810 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:52,812 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:52,831 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:43:52,834 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:43:52,849 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:43:52,870 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 11:43:52,873 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:43:52,874 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:52,886 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:43:52,927 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:43:52,945 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 11:43:52,946 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:52,949 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:43:52,963 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:52,966 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:53,046 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:43:53,049 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:43:53,059 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:43:53,075 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 11:43:53,076 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:53,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:53,129 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:53,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:53,132 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:43:53,134 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:43:54,913 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:43:54,913 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1275730753] [2021-05-06 11:43:54,913 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1275730753] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:43:54,913 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:43:54,914 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 11:43:54,914 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317869760] [2021-05-06 11:43:54,914 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 11:43:54,914 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:43:54,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 11:43:54,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 11:43:54,915 INFO L87 Difference]: Start difference. First operand 121 states and 123 transitions. Second operand has 39 states, 39 states have (on average 2.948717948717949) internal successors, (115), 38 states have internal predecessors, (115), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:57,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:43:57,601 INFO L93 Difference]: Finished difference Result 133 states and 137 transitions. [2021-05-06 11:43:57,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 11:43:57,602 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.948717948717949) internal successors, (115), 38 states have internal predecessors, (115), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 119 [2021-05-06 11:43:57,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:43:57,602 INFO L225 Difference]: With dead ends: 133 [2021-05-06 11:43:57,602 INFO L226 Difference]: Without dead ends: 125 [2021-05-06 11:43:57,603 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 10 SyntacticMatches, 72 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 737 ImplicationChecksByTransitivity, 2895.6ms TimeCoverageRelationStatistics Valid=293, Invalid=5407, Unknown=0, NotChecked=0, Total=5700 [2021-05-06 11:43:57,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-06 11:43:57,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 124. [2021-05-06 11:43:57,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 119 states have (on average 1.0252100840336134) internal successors, (122), 119 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 11:43:57,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 126 transitions. [2021-05-06 11:43:57,620 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 126 transitions. Word has length 119 [2021-05-06 11:43:57,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:43:57,621 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 126 transitions. [2021-05-06 11:43:57,621 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 2.948717948717949) internal successors, (115), 38 states have internal predecessors, (115), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:43:57,621 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 126 transitions. [2021-05-06 11:43:57,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-05-06 11:43:57,621 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:43:57,621 INFO L523 BasicCegarLoop]: trace histogram [37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:43:57,621 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable107 [2021-05-06 11:43:57,621 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:43:57,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:43:57,622 INFO L82 PathProgramCache]: Analyzing trace with hash -1301760499, now seen corresponding path program 36 times [2021-05-06 11:43:57,622 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:43:57,622 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [601221231] [2021-05-06 11:43:57,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:43:57,629 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:43:57,644 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:57,646 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:57,679 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:43:57,682 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:43:57,694 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:43:57,715 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 11:43:57,725 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:43:57,736 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:57,747 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:43:57,759 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:43:57,776 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 11:43:57,777 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:57,780 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:43:57,781 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:57,782 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:43:57,821 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:43:57,825 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:43:57,853 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:43:57,869 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 11:43:57,870 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:43:57,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:57,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:43:57,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:43:57,991 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:43:57,994 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:44:01,779 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:44:01,779 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [601221231] [2021-05-06 11:44:01,779 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [601221231] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:44:01,779 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:44:01,779 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [76] imperfect sequences [] total 76 [2021-05-06 11:44:01,779 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263258004] [2021-05-06 11:44:01,780 INFO L460 AbstractCegarLoop]: Interpolant automaton has 76 states [2021-05-06 11:44:01,780 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:44:01,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-05-06 11:44:01,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=5628, Unknown=0, NotChecked=0, Total=5852 [2021-05-06 11:44:01,780 INFO L87 Difference]: Start difference. First operand 124 states and 126 transitions. Second operand has 76 states, 76 states have (on average 1.5526315789473684) internal successors, (118), 75 states have internal predecessors, (118), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:44:08,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:44:08,459 INFO L93 Difference]: Finished difference Result 135 states and 139 transitions. [2021-05-06 11:44:08,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-05-06 11:44:08,459 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 1.5526315789473684) internal successors, (118), 75 states have internal predecessors, (118), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 122 [2021-05-06 11:44:08,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:44:08,460 INFO L225 Difference]: With dead ends: 135 [2021-05-06 11:44:08,460 INFO L226 Difference]: Without dead ends: 127 [2021-05-06 11:44:08,461 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 11 SyntacticMatches, 38 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2738 ImplicationChecksByTransitivity, 7540.1ms TimeCoverageRelationStatistics Valid=589, Invalid=21761, Unknown=0, NotChecked=0, Total=22350 [2021-05-06 11:44:08,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-06 11:44:08,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2021-05-06 11:44:08,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 122 states have (on average 1.0245901639344261) internal successors, (125), 122 states have internal predecessors, (125), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:44:08,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 129 transitions. [2021-05-06 11:44:08,486 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 129 transitions. Word has length 122 [2021-05-06 11:44:08,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:44:08,486 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 129 transitions. [2021-05-06 11:44:08,486 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 76 states, 76 states have (on average 1.5526315789473684) internal successors, (118), 75 states have internal predecessors, (118), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:44:08,486 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 129 transitions. [2021-05-06 11:44:08,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-06 11:44:08,487 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:44:08,487 INFO L523 BasicCegarLoop]: trace histogram [38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:44:08,487 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable110 [2021-05-06 11:44:08,487 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:44:08,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:44:08,488 INFO L82 PathProgramCache]: Analyzing trace with hash -1029449403, now seen corresponding path program 37 times [2021-05-06 11:44:08,488 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:44:08,488 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [626602967] [2021-05-06 11:44:08,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:44:08,495 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:44:08,514 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:08,515 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:08,535 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:44:08,539 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:44:08,553 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:44:08,574 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 11:44:08,584 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:44:08,596 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:08,607 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:44:08,616 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:44:08,634 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 11:44:08,635 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:44:08,638 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:44:08,654 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:08,661 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:08,682 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:44:08,686 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:44:08,698 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:44:08,714 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 11:44:08,716 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:44:08,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:08,780 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:44:08,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:08,788 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:44:08,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:44:10,733 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:44:10,733 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [626602967] [2021-05-06 11:44:10,733 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [626602967] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:44:10,733 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:44:10,733 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 11:44:10,733 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496316284] [2021-05-06 11:44:10,734 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 11:44:10,734 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:44:10,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 11:44:10,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1603, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 11:44:10,734 INFO L87 Difference]: Start difference. First operand 127 states and 129 transitions. Second operand has 41 states, 41 states have (on average 2.951219512195122) internal successors, (121), 40 states have internal predecessors, (121), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:44:13,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:44:13,694 INFO L93 Difference]: Finished difference Result 139 states and 143 transitions. [2021-05-06 11:44:13,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 11:44:13,694 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.951219512195122) internal successors, (121), 40 states have internal predecessors, (121), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 125 [2021-05-06 11:44:13,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:44:13,695 INFO L225 Difference]: With dead ends: 139 [2021-05-06 11:44:13,695 INFO L226 Difference]: Without dead ends: 131 [2021-05-06 11:44:13,695 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 9 SyntacticMatches, 77 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 816 ImplicationChecksByTransitivity, 3198.1ms TimeCoverageRelationStatistics Valid=309, Invalid=6011, Unknown=0, NotChecked=0, Total=6320 [2021-05-06 11:44:13,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-05-06 11:44:13,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 130. [2021-05-06 11:44:13,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 125 states have (on average 1.024) internal successors, (128), 125 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 11:44:13,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 132 transitions. [2021-05-06 11:44:13,715 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 132 transitions. Word has length 125 [2021-05-06 11:44:13,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:44:13,715 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 132 transitions. [2021-05-06 11:44:13,715 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 2.951219512195122) internal successors, (121), 40 states have internal predecessors, (121), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:44:13,715 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 132 transitions. [2021-05-06 11:44:13,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-05-06 11:44:13,716 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:44:13,716 INFO L523 BasicCegarLoop]: trace histogram [39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:44:13,716 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable113 [2021-05-06 11:44:13,716 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:44:13,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:44:13,717 INFO L82 PathProgramCache]: Analyzing trace with hash -1802810611, now seen corresponding path program 38 times [2021-05-06 11:44:13,717 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:44:13,717 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1689246491] [2021-05-06 11:44:13,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:44:13,726 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:44:13,727 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:13,728 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:13,794 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:44:13,800 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:44:13,825 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:44:13,846 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 11:44:13,854 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:44:13,874 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:13,886 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:44:13,898 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:44:13,920 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 11:44:13,921 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:44:13,924 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:44:13,925 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:13,927 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:14,020 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:44:14,022 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:44:14,049 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:44:14,069 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 11:44:14,071 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:44:14,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:14,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:44:14,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:14,126 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:44:14,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:44:16,182 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:44:16,182 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1689246491] [2021-05-06 11:44:16,183 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1689246491] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:44:16,183 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:44:16,183 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-06 11:44:16,183 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922668764] [2021-05-06 11:44:16,183 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 11:44:16,183 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:44:16,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 11:44:16,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1684, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 11:44:16,184 INFO L87 Difference]: Start difference. First operand 130 states and 132 transitions. Second operand has 42 states, 42 states have (on average 2.9523809523809526) internal successors, (124), 41 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 11:44:19,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:44:19,202 INFO L93 Difference]: Finished difference Result 142 states and 146 transitions. [2021-05-06 11:44:19,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-06 11:44:19,202 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.9523809523809526) internal successors, (124), 41 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 11:44:19,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:44:19,203 INFO L225 Difference]: With dead ends: 142 [2021-05-06 11:44:19,203 INFO L226 Difference]: Without dead ends: 134 [2021-05-06 11:44:19,203 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 10 SyntacticMatches, 78 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 857 ImplicationChecksByTransitivity, 3302.6ms TimeCoverageRelationStatistics Valid=317, Invalid=6325, Unknown=0, NotChecked=0, Total=6642 [2021-05-06 11:44:19,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-06 11:44:19,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 133. [2021-05-06 11:44:19,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.0234375) internal successors, (131), 128 states have internal predecessors, (131), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:44:19,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2021-05-06 11:44:19,230 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 128 [2021-05-06 11:44:19,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:44:19,230 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2021-05-06 11:44:19,230 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 2.9523809523809526) internal successors, (124), 41 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 11:44:19,230 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2021-05-06 11:44:19,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-06 11:44:19,231 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:44:19,231 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:44:19,231 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable116 [2021-05-06 11:44:19,231 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:44:19,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:44:19,231 INFO L82 PathProgramCache]: Analyzing trace with hash 1492984901, now seen corresponding path program 39 times [2021-05-06 11:44:19,232 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:44:19,232 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [618056322] [2021-05-06 11:44:19,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:44:19,240 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:44:19,259 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:19,260 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:19,552 WARN L205 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 1 [2021-05-06 11:44:19,564 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:44:19,567 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:44:19,579 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:44:19,601 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 11:44:19,607 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:44:19,618 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:19,632 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:44:19,641 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:44:19,657 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 11:44:19,663 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:44:19,666 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:44:19,683 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:19,684 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:19,780 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:44:19,784 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:44:19,796 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:44:19,814 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 11:44:19,815 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:44:19,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:19,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:44:19,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:19,911 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:44:19,913 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:44:24,589 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:44:24,590 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [618056322] [2021-05-06 11:44:24,590 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [618056322] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:44:24,590 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:44:24,590 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [85] imperfect sequences [] total 85 [2021-05-06 11:44:24,590 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189053942] [2021-05-06 11:44:24,590 INFO L460 AbstractCegarLoop]: Interpolant automaton has 85 states [2021-05-06 11:44:24,590 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:44:24,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-05-06 11:44:24,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=6983, Unknown=0, NotChecked=0, Total=7310 [2021-05-06 11:44:24,591 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand has 85 states, 84 states have (on average 1.5119047619047619) internal successors, (127), 83 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:44:32,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:44:32,552 INFO L93 Difference]: Finished difference Result 147 states and 152 transitions. [2021-05-06 11:44:32,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-05-06 11:44:32,552 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 84 states have (on average 1.5119047619047619) internal successors, (127), 83 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 131 [2021-05-06 11:44:32,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:44:32,554 INFO L225 Difference]: With dead ends: 147 [2021-05-06 11:44:32,554 INFO L226 Difference]: Without dead ends: 139 [2021-05-06 11:44:32,556 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 6 SyntacticMatches, 42 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3363 ImplicationChecksByTransitivity, 9128.0ms TimeCoverageRelationStatistics Valid=883, Invalid=26507, Unknown=0, NotChecked=0, Total=27390 [2021-05-06 11:44:32,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-05-06 11:44:32,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 136. [2021-05-06 11:44:32,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 131 states have (on average 1.0229007633587786) internal successors, (134), 131 states have internal predecessors, (134), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:44:32,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 138 transitions. [2021-05-06 11:44:32,583 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 138 transitions. Word has length 131 [2021-05-06 11:44:32,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:44:32,584 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 138 transitions. [2021-05-06 11:44:32,584 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 85 states, 84 states have (on average 1.5119047619047619) internal successors, (127), 83 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:44:32,584 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 138 transitions. [2021-05-06 11:44:32,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-05-06 11:44:32,584 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:44:32,584 INFO L523 BasicCegarLoop]: trace histogram [41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:44:32,585 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable119 [2021-05-06 11:44:32,585 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:44:32,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:44:32,585 INFO L82 PathProgramCache]: Analyzing trace with hash -710270963, now seen corresponding path program 40 times [2021-05-06 11:44:32,585 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:44:32,585 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1139244269] [2021-05-06 11:44:32,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:44:32,593 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:44:32,594 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:32,595 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:32,644 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:44:32,647 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:44:32,675 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:44:32,696 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 11:44:32,699 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:44:32,710 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:32,720 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:44:32,729 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:44:32,746 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 11:44:32,747 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:44:32,749 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:44:32,764 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:32,765 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:34,779 WARN L205 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 15 [2021-05-06 11:44:34,907 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:44:34,919 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:44:34,922 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:44:34,933 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:44:34,949 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 11:44:34,950 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:44:34,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:35,002 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:44:35,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:35,005 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:44:35,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:44:37,411 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:44:37,411 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1139244269] [2021-05-06 11:44:37,411 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1139244269] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:44:37,411 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:44:37,411 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-06 11:44:37,411 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176996863] [2021-05-06 11:44:37,412 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 11:44:37,412 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:44:37,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 11:44:37,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1852, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 11:44:37,412 INFO L87 Difference]: Start difference. First operand 136 states and 138 transitions. Second operand has 44 states, 44 states have (on average 2.9545454545454546) internal successors, (130), 43 states have internal predecessors, (130), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:44:40,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:44:40,708 INFO L93 Difference]: Finished difference Result 148 states and 152 transitions. [2021-05-06 11:44:40,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-06 11:44:40,709 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.9545454545454546) internal successors, (130), 43 states have internal predecessors, (130), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 134 [2021-05-06 11:44:40,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:44:40,710 INFO L225 Difference]: With dead ends: 148 [2021-05-06 11:44:40,710 INFO L226 Difference]: Without dead ends: 140 [2021-05-06 11:44:40,710 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 10 SyntacticMatches, 82 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 942 ImplicationChecksByTransitivity, 3748.9ms TimeCoverageRelationStatistics Valid=333, Invalid=6977, Unknown=0, NotChecked=0, Total=7310 [2021-05-06 11:44:40,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-05-06 11:44:40,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 139. [2021-05-06 11:44:40,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.0223880597014925) internal successors, (137), 134 states have internal predecessors, (137), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:44:40,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 141 transitions. [2021-05-06 11:44:40,744 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 141 transitions. Word has length 134 [2021-05-06 11:44:40,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:44:40,745 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 141 transitions. [2021-05-06 11:44:40,745 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 2.9545454545454546) internal successors, (130), 43 states have internal predecessors, (130), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:44:40,745 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 141 transitions. [2021-05-06 11:44:40,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-06 11:44:40,746 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:44:40,746 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:44:40,746 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable122 [2021-05-06 11:44:40,746 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:44:40,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:44:40,746 INFO L82 PathProgramCache]: Analyzing trace with hash 2079469381, now seen corresponding path program 41 times [2021-05-06 11:44:40,746 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:44:40,746 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2005492216] [2021-05-06 11:44:40,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:44:40,754 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:44:40,773 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:40,774 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:40,808 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:44:40,812 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:44:40,829 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:44:40,858 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 11:44:40,864 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:44:40,865 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:40,880 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:44:40,904 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:44:40,929 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 11:44:40,930 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:44:40,934 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:44:40,960 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:40,961 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:40,990 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:44:40,995 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:44:41,011 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:44:41,034 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 11:44:41,035 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:44:41,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:41,109 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:44:41,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:41,113 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:44:41,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:44:43,454 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:44:43,454 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2005492216] [2021-05-06 11:44:43,454 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2005492216] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:44:43,454 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:44:43,454 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2021-05-06 11:44:43,454 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1389737108] [2021-05-06 11:44:43,454 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-06 11:44:43,454 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:44:43,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-06 11:44:43,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1939, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 11:44:43,455 INFO L87 Difference]: Start difference. First operand 139 states and 141 transitions. Second operand has 45 states, 45 states have (on average 2.9555555555555557) internal successors, (133), 44 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:44:47,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:44:47,051 INFO L93 Difference]: Finished difference Result 151 states and 155 transitions. [2021-05-06 11:44:47,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-06 11:44:47,052 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.9555555555555557) internal successors, (133), 44 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 137 [2021-05-06 11:44:47,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:44:47,053 INFO L225 Difference]: With dead ends: 151 [2021-05-06 11:44:47,053 INFO L226 Difference]: Without dead ends: 143 [2021-05-06 11:44:47,054 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 10 SyntacticMatches, 84 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 986 ImplicationChecksByTransitivity, 3814.0ms TimeCoverageRelationStatistics Valid=341, Invalid=7315, Unknown=0, NotChecked=0, Total=7656 [2021-05-06 11:44:47,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-05-06 11:44:47,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 142. [2021-05-06 11:44:47,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 137 states have (on average 1.0218978102189782) internal successors, (140), 137 states have internal predecessors, (140), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:44:47,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 144 transitions. [2021-05-06 11:44:47,078 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 144 transitions. Word has length 137 [2021-05-06 11:44:47,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:44:47,078 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 144 transitions. [2021-05-06 11:44:47,078 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 2.9555555555555557) internal successors, (133), 44 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:44:47,078 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 144 transitions. [2021-05-06 11:44:47,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-05-06 11:44:47,079 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:44:47,079 INFO L523 BasicCegarLoop]: trace histogram [43, 43, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:44:47,079 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable125 [2021-05-06 11:44:47,079 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:44:47,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:44:47,079 INFO L82 PathProgramCache]: Analyzing trace with hash -678087411, now seen corresponding path program 42 times [2021-05-06 11:44:47,080 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:44:47,080 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1751221851] [2021-05-06 11:44:47,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:44:47,088 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:44:47,089 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:47,090 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:47,114 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:44:47,117 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:44:47,158 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:44:47,190 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 11:44:47,194 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:44:47,208 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:47,218 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:44:47,227 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:44:47,255 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 11:44:47,256 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:44:47,258 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:44:47,274 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:47,276 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:44:47,295 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:44:47,299 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:44:47,311 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:44:47,328 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 11:44:47,329 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:44:47,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:47,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:44:47,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:44:47,431 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:44:47,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:44:52,874 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:44:52,874 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1751221851] [2021-05-06 11:44:52,874 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1751221851] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:44:52,874 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:44:52,874 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [91] imperfect sequences [] total 91 [2021-05-06 11:44:52,874 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319751441] [2021-05-06 11:44:52,874 INFO L460 AbstractCegarLoop]: Interpolant automaton has 91 states [2021-05-06 11:44:52,874 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:44:52,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2021-05-06 11:44:52,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=8021, Unknown=0, NotChecked=0, Total=8372 [2021-05-06 11:44:52,875 INFO L87 Difference]: Start difference. First operand 142 states and 144 transitions. Second operand has 91 states, 90 states have (on average 1.511111111111111) internal successors, (136), 89 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:01,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:45:01,648 INFO L93 Difference]: Finished difference Result 156 states and 161 transitions. [2021-05-06 11:45:01,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2021-05-06 11:45:01,648 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 90 states have (on average 1.511111111111111) internal successors, (136), 89 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 140 [2021-05-06 11:45:01,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:45:01,649 INFO L225 Difference]: With dead ends: 156 [2021-05-06 11:45:01,649 INFO L226 Difference]: Without dead ends: 148 [2021-05-06 11:45:01,651 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 6 SyntacticMatches, 45 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3873 ImplicationChecksByTransitivity, 10407.6ms TimeCoverageRelationStatistics Valid=949, Invalid=30557, Unknown=0, NotChecked=0, Total=31506 [2021-05-06 11:45:01,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-05-06 11:45:01,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 145. [2021-05-06 11:45:01,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 140 states have (on average 1.0214285714285714) internal successors, (143), 140 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 11:45:01,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 147 transitions. [2021-05-06 11:45:01,686 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 147 transitions. Word has length 140 [2021-05-06 11:45:01,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:45:01,686 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 147 transitions. [2021-05-06 11:45:01,686 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 91 states, 90 states have (on average 1.511111111111111) internal successors, (136), 89 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:01,686 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 147 transitions. [2021-05-06 11:45:01,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-05-06 11:45:01,687 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:45:01,687 INFO L523 BasicCegarLoop]: trace histogram [44, 44, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:45:01,687 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable128 [2021-05-06 11:45:01,687 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:45:01,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:45:01,688 INFO L82 PathProgramCache]: Analyzing trace with hash -1213007291, now seen corresponding path program 43 times [2021-05-06 11:45:01,688 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:45:01,688 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1212147647] [2021-05-06 11:45:01,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:45:01,708 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:45:01,726 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:01,728 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:01,757 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:45:01,762 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:45:01,780 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:45:01,803 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 11:45:01,807 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:45:01,819 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:01,830 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:45:01,839 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:45:01,856 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 11:45:01,857 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:45:01,859 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:45:01,876 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:01,878 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:01,919 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:45:01,922 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:45:01,934 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:45:01,955 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 11:45:01,962 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:45:01,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:02,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:45:02,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:02,021 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:45:02,024 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:45:04,565 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:45:04,565 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1212147647] [2021-05-06 11:45:04,565 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1212147647] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:45:04,565 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:45:04,565 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2021-05-06 11:45:04,565 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521506480] [2021-05-06 11:45:04,566 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-06 11:45:04,566 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:45:04,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-06 11:45:04,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=2119, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 11:45:04,566 INFO L87 Difference]: Start difference. First operand 145 states and 147 transitions. Second operand has 47 states, 47 states have (on average 2.9574468085106385) internal successors, (139), 46 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 11:45:08,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:45:08,358 INFO L93 Difference]: Finished difference Result 157 states and 161 transitions. [2021-05-06 11:45:08,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-06 11:45:08,359 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.9574468085106385) internal successors, (139), 46 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 11:45:08,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:45:08,359 INFO L225 Difference]: With dead ends: 157 [2021-05-06 11:45:08,359 INFO L226 Difference]: Without dead ends: 149 [2021-05-06 11:45:08,360 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 10 SyntacticMatches, 88 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1077 ImplicationChecksByTransitivity, 4073.4ms TimeCoverageRelationStatistics Valid=357, Invalid=8015, Unknown=0, NotChecked=0, Total=8372 [2021-05-06 11:45:08,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-06 11:45:08,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 148. [2021-05-06 11:45:08,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 143 states have (on average 1.020979020979021) internal successors, (146), 143 states have internal predecessors, (146), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:08,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 150 transitions. [2021-05-06 11:45:08,384 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 150 transitions. Word has length 143 [2021-05-06 11:45:08,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:45:08,384 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 150 transitions. [2021-05-06 11:45:08,384 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 2.9574468085106385) internal successors, (139), 46 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 11:45:08,384 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 150 transitions. [2021-05-06 11:45:08,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-05-06 11:45:08,385 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:45:08,385 INFO L523 BasicCegarLoop]: trace histogram [45, 45, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:45:08,385 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable131 [2021-05-06 11:45:08,385 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:45:08,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:45:08,385 INFO L82 PathProgramCache]: Analyzing trace with hash 1612483085, now seen corresponding path program 44 times [2021-05-06 11:45:08,385 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:45:08,385 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [771299537] [2021-05-06 11:45:08,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:45:08,396 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:45:08,397 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:08,398 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:08,416 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:45:08,419 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:45:08,444 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:45:08,468 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 11:45:08,471 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:45:08,472 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:08,483 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:45:08,518 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:45:08,534 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 11:45:08,535 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:45:08,538 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:45:08,539 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:08,540 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:08,603 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:45:08,606 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:45:08,646 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:45:08,662 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 11:45:08,668 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:45:08,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:08,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:45:08,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:08,735 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:45:08,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:45:11,412 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:45:11,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [771299537] [2021-05-06 11:45:11,413 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [771299537] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:45:11,413 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:45:11,413 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2021-05-06 11:45:11,413 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130448026] [2021-05-06 11:45:11,413 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-06 11:45:11,413 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:45:11,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-06 11:45:11,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=2212, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 11:45:11,414 INFO L87 Difference]: Start difference. First operand 148 states and 150 transitions. Second operand has 48 states, 48 states have (on average 2.9583333333333335) internal successors, (142), 47 states have internal predecessors, (142), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:15,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:45:15,294 INFO L93 Difference]: Finished difference Result 160 states and 164 transitions. [2021-05-06 11:45:15,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-06 11:45:15,295 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.9583333333333335) internal successors, (142), 47 states have internal predecessors, (142), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 146 [2021-05-06 11:45:15,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:45:15,296 INFO L225 Difference]: With dead ends: 160 [2021-05-06 11:45:15,296 INFO L226 Difference]: Without dead ends: 152 [2021-05-06 11:45:15,296 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 9 SyntacticMatches, 91 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1124 ImplicationChecksByTransitivity, 4251.3ms TimeCoverageRelationStatistics Valid=365, Invalid=8377, Unknown=0, NotChecked=0, Total=8742 [2021-05-06 11:45:15,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-05-06 11:45:15,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 151. [2021-05-06 11:45:15,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 146 states have (on average 1.0205479452054795) internal successors, (149), 146 states have internal predecessors, (149), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:15,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 153 transitions. [2021-05-06 11:45:15,321 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 153 transitions. Word has length 146 [2021-05-06 11:45:15,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:45:15,321 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 153 transitions. [2021-05-06 11:45:15,321 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 2.9583333333333335) internal successors, (142), 47 states have internal predecessors, (142), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:15,321 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 153 transitions. [2021-05-06 11:45:15,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-05-06 11:45:15,322 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:45:15,322 INFO L523 BasicCegarLoop]: trace histogram [46, 46, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:45:15,322 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable134 [2021-05-06 11:45:15,322 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:45:15,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:45:15,322 INFO L82 PathProgramCache]: Analyzing trace with hash -1267759803, now seen corresponding path program 45 times [2021-05-06 11:45:15,323 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:45:15,323 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2105528891] [2021-05-06 11:45:15,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:45:15,330 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:45:15,332 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:15,333 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:15,643 WARN L205 SmtUtils]: Spent 308.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:45:15,658 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:45:15,661 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:45:15,686 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:45:15,708 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 11:45:15,712 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:45:15,712 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:15,722 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:45:15,740 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:45:15,757 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 11:45:15,758 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:45:15,761 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:45:15,761 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:15,762 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:15,782 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:45:15,785 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:45:15,811 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:45:15,828 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 11:45:15,841 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:45:15,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:15,911 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:45:15,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:15,914 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:45:15,917 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:45:18,839 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:45:18,839 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2105528891] [2021-05-06 11:45:18,839 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2105528891] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:45:18,839 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:45:18,839 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2021-05-06 11:45:18,840 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659936004] [2021-05-06 11:45:18,840 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-06 11:45:18,840 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:45:18,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-06 11:45:18,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 11:45:18,840 INFO L87 Difference]: Start difference. First operand 151 states and 153 transitions. Second operand has 49 states, 49 states have (on average 2.9591836734693877) internal successors, (145), 48 states have internal predecessors, (145), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:23,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:45:23,033 INFO L93 Difference]: Finished difference Result 163 states and 167 transitions. [2021-05-06 11:45:23,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 11:45:23,033 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.9591836734693877) internal successors, (145), 48 states have internal predecessors, (145), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 149 [2021-05-06 11:45:23,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:45:23,034 INFO L225 Difference]: With dead ends: 163 [2021-05-06 11:45:23,034 INFO L226 Difference]: Without dead ends: 155 [2021-05-06 11:45:23,035 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 9 SyntacticMatches, 93 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1172 ImplicationChecksByTransitivity, 4614.3ms TimeCoverageRelationStatistics Valid=373, Invalid=8747, Unknown=0, NotChecked=0, Total=9120 [2021-05-06 11:45:23,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-05-06 11:45:23,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 154. [2021-05-06 11:45:23,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 149 states have (on average 1.0201342281879195) internal successors, (152), 149 states have internal predecessors, (152), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:23,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 156 transitions. [2021-05-06 11:45:23,068 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 156 transitions. Word has length 149 [2021-05-06 11:45:23,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:45:23,068 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 156 transitions. [2021-05-06 11:45:23,068 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 2.9591836734693877) internal successors, (145), 48 states have internal predecessors, (145), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:23,068 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 156 transitions. [2021-05-06 11:45:23,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-05-06 11:45:23,069 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:45:23,069 INFO L523 BasicCegarLoop]: trace histogram [47, 47, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:45:23,069 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable137 [2021-05-06 11:45:23,069 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:45:23,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:45:23,069 INFO L82 PathProgramCache]: Analyzing trace with hash -1726996723, now seen corresponding path program 46 times [2021-05-06 11:45:23,070 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:45:23,070 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1888574587] [2021-05-06 11:45:23,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:45:23,077 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:45:23,079 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:23,080 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:23,102 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:45:23,105 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:45:23,134 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:45:23,156 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 11:45:23,161 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:45:23,173 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:23,183 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:45:23,192 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:45:23,208 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 11:45:23,209 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:45:23,212 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:45:23,212 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:23,215 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:23,317 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:45:23,334 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:45:23,336 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:45:23,365 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:45:23,381 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 11:45:23,382 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:45:23,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:23,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:45:23,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:23,437 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:45:23,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:45:26,482 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:45:26,483 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1888574587] [2021-05-06 11:45:26,483 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1888574587] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:45:26,483 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:45:26,483 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2021-05-06 11:45:26,483 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [191247945] [2021-05-06 11:45:26,483 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-06 11:45:26,483 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:45:26,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-06 11:45:26,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=2404, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 11:45:26,484 INFO L87 Difference]: Start difference. First operand 154 states and 156 transitions. Second operand has 50 states, 50 states have (on average 2.96) internal successors, (148), 49 states have internal predecessors, (148), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:30,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:45:30,658 INFO L93 Difference]: Finished difference Result 166 states and 170 transitions. [2021-05-06 11:45:30,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-06 11:45:30,658 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.96) internal successors, (148), 49 states have internal predecessors, (148), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 152 [2021-05-06 11:45:30,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:45:30,659 INFO L225 Difference]: With dead ends: 166 [2021-05-06 11:45:30,659 INFO L226 Difference]: Without dead ends: 158 [2021-05-06 11:45:30,660 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 9 SyntacticMatches, 95 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1221 ImplicationChecksByTransitivity, 4680.2ms TimeCoverageRelationStatistics Valid=381, Invalid=9125, Unknown=0, NotChecked=0, Total=9506 [2021-05-06 11:45:30,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-05-06 11:45:30,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 157. [2021-05-06 11:45:30,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 152 states have (on average 1.019736842105263) internal successors, (155), 152 states have internal predecessors, (155), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:30,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2021-05-06 11:45:30,684 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 152 [2021-05-06 11:45:30,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:45:30,684 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2021-05-06 11:45:30,684 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 2.96) internal successors, (148), 49 states have internal predecessors, (148), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:30,684 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2021-05-06 11:45:30,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-05-06 11:45:30,684 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:45:30,685 INFO L523 BasicCegarLoop]: trace histogram [48, 48, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:45:30,685 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable140 [2021-05-06 11:45:30,685 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:45:30,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:45:30,685 INFO L82 PathProgramCache]: Analyzing trace with hash 911724613, now seen corresponding path program 47 times [2021-05-06 11:45:30,685 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:45:30,685 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1978299427] [2021-05-06 11:45:30,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:45:30,693 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:45:30,708 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:30,710 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:30,763 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:45:30,766 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:45:30,778 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:45:30,801 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 11:45:30,804 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:45:30,815 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:30,828 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:45:30,837 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:45:30,853 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 11:45:30,854 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:45:30,857 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:45:30,872 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:30,873 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:30,914 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:45:30,918 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:45:30,930 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:45:30,951 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 11:45:30,952 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:45:30,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:31,015 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:45:31,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:31,029 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 11:45:31,032 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:45:37,175 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:45:37,175 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1978299427] [2021-05-06 11:45:37,175 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1978299427] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:45:37,176 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:45:37,176 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [98] imperfect sequences [] total 98 [2021-05-06 11:45:37,176 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690776886] [2021-05-06 11:45:37,176 INFO L460 AbstractCegarLoop]: Interpolant automaton has 98 states [2021-05-06 11:45:37,176 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:45:37,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-05-06 11:45:37,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=9412, Unknown=0, NotChecked=0, Total=9702 [2021-05-06 11:45:37,177 INFO L87 Difference]: Start difference. First operand 157 states and 159 transitions. Second operand has 98 states, 98 states have (on average 1.5408163265306123) internal successors, (151), 97 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:47,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:45:47,898 INFO L93 Difference]: Finished difference Result 168 states and 172 transitions. [2021-05-06 11:45:47,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2021-05-06 11:45:47,898 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 1.5408163265306123) internal successors, (151), 97 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 155 [2021-05-06 11:45:47,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:45:47,899 INFO L225 Difference]: With dead ends: 168 [2021-05-06 11:45:47,899 INFO L226 Difference]: Without dead ends: 160 [2021-05-06 11:45:47,900 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 11 SyntacticMatches, 49 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4608 ImplicationChecksByTransitivity, 12011.5ms TimeCoverageRelationStatistics Valid=765, Invalid=36677, Unknown=0, NotChecked=0, Total=37442 [2021-05-06 11:45:47,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-05-06 11:45:47,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2021-05-06 11:45:47,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 155 states have (on average 1.0193548387096774) internal successors, (158), 155 states have internal predecessors, (158), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:47,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 162 transitions. [2021-05-06 11:45:47,932 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 162 transitions. Word has length 155 [2021-05-06 11:45:47,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:45:47,932 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 162 transitions. [2021-05-06 11:45:47,933 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 98 states, 98 states have (on average 1.5408163265306123) internal successors, (151), 97 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:47,933 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 162 transitions. [2021-05-06 11:45:47,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-05-06 11:45:47,933 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:45:47,933 INFO L523 BasicCegarLoop]: trace histogram [49, 49, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:45:47,934 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable143 [2021-05-06 11:45:47,934 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:45:47,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:45:47,934 INFO L82 PathProgramCache]: Analyzing trace with hash 272626701, now seen corresponding path program 48 times [2021-05-06 11:45:47,934 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:45:47,934 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [917757756] [2021-05-06 11:45:47,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:45:47,946 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:45:47,947 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:47,948 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:48,016 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:45:48,019 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:45:48,045 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:45:48,066 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 11:45:48,070 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:45:48,081 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:48,112 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:45:48,122 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:45:48,138 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 11:45:48,139 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:45:48,142 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:45:48,157 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:48,161 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:48,201 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:45:48,204 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:45:48,215 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:45:48,232 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 11:45:48,234 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:45:48,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:48,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:45:48,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:48,288 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:45:48,290 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:45:51,436 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:45:51,436 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [917757756] [2021-05-06 11:45:51,436 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [917757756] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:45:51,437 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:45:51,437 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2021-05-06 11:45:51,437 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673161223] [2021-05-06 11:45:51,437 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-06 11:45:51,437 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:45:51,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-06 11:45:51,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=2604, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 11:45:51,437 INFO L87 Difference]: Start difference. First operand 160 states and 162 transitions. Second operand has 52 states, 52 states have (on average 2.9615384615384617) internal successors, (154), 51 states have internal predecessors, (154), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:56,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:45:56,028 INFO L93 Difference]: Finished difference Result 172 states and 176 transitions. [2021-05-06 11:45:56,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-06 11:45:56,028 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.9615384615384617) internal successors, (154), 51 states have internal predecessors, (154), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 158 [2021-05-06 11:45:56,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:45:56,029 INFO L225 Difference]: With dead ends: 172 [2021-05-06 11:45:56,029 INFO L226 Difference]: Without dead ends: 164 [2021-05-06 11:45:56,030 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 10 SyntacticMatches, 98 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1322 ImplicationChecksByTransitivity, 4954.2ms TimeCoverageRelationStatistics Valid=397, Invalid=9905, Unknown=0, NotChecked=0, Total=10302 [2021-05-06 11:45:56,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-05-06 11:45:56,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 163. [2021-05-06 11:45:56,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 158 states have (on average 1.018987341772152) internal successors, (161), 158 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 11:45:56,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 165 transitions. [2021-05-06 11:45:56,058 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 165 transitions. Word has length 158 [2021-05-06 11:45:56,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:45:56,058 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 165 transitions. [2021-05-06 11:45:56,059 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 2.9615384615384617) internal successors, (154), 51 states have internal predecessors, (154), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:45:56,059 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 165 transitions. [2021-05-06 11:45:56,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-05-06 11:45:56,059 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:45:56,059 INFO L523 BasicCegarLoop]: trace histogram [50, 50, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:45:56,060 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable146 [2021-05-06 11:45:56,060 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:45:56,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:45:56,060 INFO L82 PathProgramCache]: Analyzing trace with hash 496753477, now seen corresponding path program 49 times [2021-05-06 11:45:56,060 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:45:56,060 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2032999581] [2021-05-06 11:45:56,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:45:56,068 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:45:56,086 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:56,088 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:56,109 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:45:56,112 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:45:56,125 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:45:56,146 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 11:45:56,150 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:45:56,161 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:56,178 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:45:56,187 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:45:56,204 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 11:45:56,205 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:45:56,208 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:45:56,224 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:56,226 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:45:56,428 WARN L205 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 1 [2021-05-06 11:45:56,440 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:45:56,444 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:45:56,456 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:45:56,473 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 11:45:56,474 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:45:56,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:56,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:45:56,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:45:56,539 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:45:56,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:45:59,820 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:45:59,821 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2032999581] [2021-05-06 11:45:59,821 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2032999581] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:45:59,821 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:45:59,821 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2021-05-06 11:45:59,821 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206199338] [2021-05-06 11:45:59,821 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-06 11:45:59,821 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:45:59,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-06 11:45:59,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=2707, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 11:45:59,822 INFO L87 Difference]: Start difference. First operand 163 states and 165 transitions. Second operand has 53 states, 53 states have (on average 2.9622641509433962) internal successors, (157), 52 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 11:46:04,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:46:04,498 INFO L93 Difference]: Finished difference Result 175 states and 179 transitions. [2021-05-06 11:46:04,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-06 11:46:04,499 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.9622641509433962) internal successors, (157), 52 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 11:46:04,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:46:04,500 INFO L225 Difference]: With dead ends: 175 [2021-05-06 11:46:04,500 INFO L226 Difference]: Without dead ends: 167 [2021-05-06 11:46:04,500 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 10 SyntacticMatches, 100 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1374 ImplicationChecksByTransitivity, 5118.3ms TimeCoverageRelationStatistics Valid=405, Invalid=10307, Unknown=0, NotChecked=0, Total=10712 [2021-05-06 11:46:04,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-05-06 11:46:04,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 166. [2021-05-06 11:46:04,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 161 states have (on average 1.0186335403726707) internal successors, (164), 161 states have internal predecessors, (164), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:46:04,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 168 transitions. [2021-05-06 11:46:04,535 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 168 transitions. Word has length 161 [2021-05-06 11:46:04,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:46:04,535 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 168 transitions. [2021-05-06 11:46:04,535 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 2.9622641509433962) internal successors, (157), 52 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 11:46:04,535 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 168 transitions. [2021-05-06 11:46:04,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-05-06 11:46:04,536 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:46:04,536 INFO L523 BasicCegarLoop]: trace histogram [51, 51, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:46:04,536 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable149 [2021-05-06 11:46:04,536 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:46:04,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:46:04,536 INFO L82 PathProgramCache]: Analyzing trace with hash -1216607987, now seen corresponding path program 50 times [2021-05-06 11:46:04,537 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:46:04,537 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1225795557] [2021-05-06 11:46:04,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:46:04,544 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:46:04,561 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:04,563 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:04,622 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:46:04,625 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:46:04,637 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:46:04,661 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 11:46:04,665 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:46:04,665 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:04,676 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:46:04,696 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:46:04,713 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 11:46:04,714 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:46:04,717 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:46:04,734 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:04,739 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:04,768 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:46:04,771 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:46:04,785 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:46:04,802 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 11:46:04,803 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:46:04,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:04,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:46:04,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:04,860 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:46:04,862 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:46:08,217 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:46:08,217 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1225795557] [2021-05-06 11:46:08,217 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1225795557] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:46:08,217 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:46:08,217 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2021-05-06 11:46:08,217 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265823344] [2021-05-06 11:46:08,217 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-06 11:46:08,217 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:46:08,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-06 11:46:08,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=2812, Unknown=0, NotChecked=0, Total=2970 [2021-05-06 11:46:08,218 INFO L87 Difference]: Start difference. First operand 166 states and 168 transitions. Second operand has 54 states, 54 states have (on average 2.962962962962963) internal successors, (160), 53 states have internal predecessors, (160), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:46:13,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:46:13,043 INFO L93 Difference]: Finished difference Result 178 states and 182 transitions. [2021-05-06 11:46:13,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-06 11:46:13,043 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.962962962962963) internal successors, (160), 53 states have internal predecessors, (160), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 164 [2021-05-06 11:46:13,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:46:13,044 INFO L225 Difference]: With dead ends: 178 [2021-05-06 11:46:13,044 INFO L226 Difference]: Without dead ends: 170 [2021-05-06 11:46:13,044 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 9 SyntacticMatches, 103 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1427 ImplicationChecksByTransitivity, 5261.0ms TimeCoverageRelationStatistics Valid=413, Invalid=10717, Unknown=0, NotChecked=0, Total=11130 [2021-05-06 11:46:13,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-05-06 11:46:13,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2021-05-06 11:46:13,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 164 states have (on average 1.0182926829268293) internal successors, (167), 164 states have internal predecessors, (167), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:46:13,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 171 transitions. [2021-05-06 11:46:13,079 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 171 transitions. Word has length 164 [2021-05-06 11:46:13,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:46:13,080 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 171 transitions. [2021-05-06 11:46:13,080 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 2.962962962962963) internal successors, (160), 53 states have internal predecessors, (160), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:46:13,080 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 171 transitions. [2021-05-06 11:46:13,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-05-06 11:46:13,080 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:46:13,080 INFO L523 BasicCegarLoop]: trace histogram [52, 52, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:46:13,080 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable152 [2021-05-06 11:46:13,080 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:46:13,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:46:13,081 INFO L82 PathProgramCache]: Analyzing trace with hash 1718330949, now seen corresponding path program 51 times [2021-05-06 11:46:13,081 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:46:13,081 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1658374736] [2021-05-06 11:46:13,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:46:13,103 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:46:13,121 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:13,122 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:13,354 WARN L205 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:46:13,367 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:46:13,369 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:46:13,382 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:46:13,403 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 11:46:13,406 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:46:13,407 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:13,429 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:46:13,449 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:46:13,466 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 11:46:13,467 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:46:13,469 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:46:13,470 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:13,471 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:13,562 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:46:13,566 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:46:13,593 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:46:13,609 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 11:46:13,610 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:46:13,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:13,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:46:13,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:13,677 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 11:46:13,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:46:17,313 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:46:17,313 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1658374736] [2021-05-06 11:46:17,313 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1658374736] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:46:17,313 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:46:17,313 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [55] imperfect sequences [] total 55 [2021-05-06 11:46:17,313 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [26135403] [2021-05-06 11:46:17,314 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-06 11:46:17,314 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:46:17,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-06 11:46:17,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=2919, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 11:46:17,314 INFO L87 Difference]: Start difference. First operand 169 states and 171 transitions. Second operand has 55 states, 55 states have (on average 2.963636363636364) internal successors, (163), 54 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:46:22,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:46:22,312 INFO L93 Difference]: Finished difference Result 181 states and 185 transitions. [2021-05-06 11:46:22,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-06 11:46:22,313 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.963636363636364) internal successors, (163), 54 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 167 [2021-05-06 11:46:22,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:46:22,313 INFO L225 Difference]: With dead ends: 181 [2021-05-06 11:46:22,313 INFO L226 Difference]: Without dead ends: 173 [2021-05-06 11:46:22,314 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 9 SyntacticMatches, 105 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1481 ImplicationChecksByTransitivity, 5599.3ms TimeCoverageRelationStatistics Valid=421, Invalid=11135, Unknown=0, NotChecked=0, Total=11556 [2021-05-06 11:46:22,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-05-06 11:46:22,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 172. [2021-05-06 11:46:22,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 167 states have (on average 1.0179640718562875) internal successors, (170), 167 states have internal predecessors, (170), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:46:22,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 174 transitions. [2021-05-06 11:46:22,341 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 174 transitions. Word has length 167 [2021-05-06 11:46:22,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:46:22,341 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 174 transitions. [2021-05-06 11:46:22,341 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 2.963636363636364) internal successors, (163), 54 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:46:22,341 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 174 transitions. [2021-05-06 11:46:22,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-05-06 11:46:22,342 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:46:22,342 INFO L523 BasicCegarLoop]: trace histogram [53, 53, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:46:22,342 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable155 [2021-05-06 11:46:22,342 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:46:22,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:46:22,342 INFO L82 PathProgramCache]: Analyzing trace with hash -460038643, now seen corresponding path program 52 times [2021-05-06 11:46:22,342 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:46:22,342 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [833424630] [2021-05-06 11:46:22,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:46:22,352 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:46:22,353 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:22,354 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:22,506 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:46:22,519 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:46:22,522 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:46:22,547 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:46:22,569 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 11:46:22,573 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:46:22,573 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:22,584 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:46:22,612 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:46:22,630 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 11:46:22,631 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:46:22,633 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:46:22,649 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:22,650 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:22,676 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:46:22,679 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:46:22,692 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:46:22,709 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 11:46:22,710 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:46:22,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:22,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:46:22,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:22,767 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:46:22,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:46:26,395 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:46:26,395 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [833424630] [2021-05-06 11:46:26,395 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [833424630] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:46:26,395 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:46:26,396 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [56] imperfect sequences [] total 56 [2021-05-06 11:46:26,396 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965004729] [2021-05-06 11:46:26,396 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-06 11:46:26,396 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:46:26,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-06 11:46:26,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=3028, Unknown=0, NotChecked=0, Total=3192 [2021-05-06 11:46:26,397 INFO L87 Difference]: Start difference. First operand 172 states and 174 transitions. Second operand has 56 states, 56 states have (on average 2.9642857142857144) internal successors, (166), 55 states have internal predecessors, (166), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:46:31,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:46:31,543 INFO L93 Difference]: Finished difference Result 184 states and 188 transitions. [2021-05-06 11:46:31,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-06 11:46:31,544 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.9642857142857144) internal successors, (166), 55 states have internal predecessors, (166), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 170 [2021-05-06 11:46:31,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:46:31,544 INFO L225 Difference]: With dead ends: 184 [2021-05-06 11:46:31,545 INFO L226 Difference]: Without dead ends: 176 [2021-05-06 11:46:31,545 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 10 SyntacticMatches, 106 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1536 ImplicationChecksByTransitivity, 5646.1ms TimeCoverageRelationStatistics Valid=429, Invalid=11561, Unknown=0, NotChecked=0, Total=11990 [2021-05-06 11:46:31,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2021-05-06 11:46:31,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 175. [2021-05-06 11:46:31,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 170 states have (on average 1.0176470588235293) internal successors, (173), 170 states have internal predecessors, (173), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:46:31,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 177 transitions. [2021-05-06 11:46:31,577 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 177 transitions. Word has length 170 [2021-05-06 11:46:31,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:46:31,578 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 177 transitions. [2021-05-06 11:46:31,578 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 56 states have (on average 2.9642857142857144) internal successors, (166), 55 states have internal predecessors, (166), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:46:31,578 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 177 transitions. [2021-05-06 11:46:31,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-05-06 11:46:31,578 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:46:31,578 INFO L523 BasicCegarLoop]: trace histogram [54, 54, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:46:31,578 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable158 [2021-05-06 11:46:31,578 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:46:31,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:46:31,579 INFO L82 PathProgramCache]: Analyzing trace with hash 687288645, now seen corresponding path program 53 times [2021-05-06 11:46:31,579 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:46:31,579 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1793068961] [2021-05-06 11:46:31,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:46:31,610 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:46:31,611 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:31,612 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:31,635 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:46:31,638 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:46:31,667 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:46:31,700 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 11:46:31,705 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:46:31,706 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:31,719 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:46:31,748 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:46:31,770 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 11:46:31,772 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:46:31,775 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:46:31,776 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:31,777 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:31,898 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:46:31,904 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:46:31,929 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:46:31,946 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 11:46:31,947 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:46:31,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:32,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:46:32,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:32,007 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:46:32,013 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:46:35,700 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:46:35,700 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1793068961] [2021-05-06 11:46:35,700 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1793068961] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:46:35,701 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:46:35,701 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2021-05-06 11:46:35,701 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876427784] [2021-05-06 11:46:35,701 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-06 11:46:35,701 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:46:35,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-06 11:46:35,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=3139, Unknown=0, NotChecked=0, Total=3306 [2021-05-06 11:46:35,702 INFO L87 Difference]: Start difference. First operand 175 states and 177 transitions. Second operand has 57 states, 57 states have (on average 2.9649122807017543) internal successors, (169), 56 states have internal predecessors, (169), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:46:41,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:46:41,053 INFO L93 Difference]: Finished difference Result 187 states and 191 transitions. [2021-05-06 11:46:41,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-06 11:46:41,053 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.9649122807017543) internal successors, (169), 56 states have internal predecessors, (169), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 173 [2021-05-06 11:46:41,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:46:41,054 INFO L225 Difference]: With dead ends: 187 [2021-05-06 11:46:41,054 INFO L226 Difference]: Without dead ends: 179 [2021-05-06 11:46:41,055 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 9 SyntacticMatches, 109 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1592 ImplicationChecksByTransitivity, 5783.1ms TimeCoverageRelationStatistics Valid=437, Invalid=11995, Unknown=0, NotChecked=0, Total=12432 [2021-05-06 11:46:41,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-05-06 11:46:41,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 178. [2021-05-06 11:46:41,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 173 states have (on average 1.0173410404624277) internal successors, (176), 173 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 11:46:41,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 180 transitions. [2021-05-06 11:46:41,086 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 180 transitions. Word has length 173 [2021-05-06 11:46:41,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:46:41,086 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 180 transitions. [2021-05-06 11:46:41,086 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 2.9649122807017543) internal successors, (169), 56 states have internal predecessors, (169), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:46:41,086 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 180 transitions. [2021-05-06 11:46:41,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-05-06 11:46:41,087 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:46:41,087 INFO L523 BasicCegarLoop]: trace histogram [55, 55, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:46:41,087 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable161 [2021-05-06 11:46:41,087 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:46:41,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:46:41,088 INFO L82 PathProgramCache]: Analyzing trace with hash 1364783885, now seen corresponding path program 54 times [2021-05-06 11:46:41,088 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:46:41,088 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1319072421] [2021-05-06 11:46:41,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:46:41,095 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:46:41,114 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:41,115 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:41,191 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:46:41,195 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:46:41,211 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:46:41,236 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 11:46:41,239 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:46:41,250 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:41,260 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:46:41,269 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:46:41,288 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 11:46:41,289 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:46:41,291 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:46:41,292 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:41,293 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:42,051 WARN L205 SmtUtils]: Spent 757.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:46:42,070 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:46:42,073 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:46:42,100 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:46:42,116 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 11:46:42,117 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:46:42,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:42,186 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:46:42,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:42,189 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:46:42,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:46:46,026 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:46:46,027 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1319072421] [2021-05-06 11:46:46,027 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1319072421] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:46:46,027 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:46:46,027 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [58] imperfect sequences [] total 58 [2021-05-06 11:46:46,027 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421115797] [2021-05-06 11:46:46,027 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-06 11:46:46,027 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:46:46,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-06 11:46:46,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=3252, Unknown=0, NotChecked=0, Total=3422 [2021-05-06 11:46:46,028 INFO L87 Difference]: Start difference. First operand 178 states and 180 transitions. Second operand has 58 states, 58 states have (on average 2.9655172413793105) internal successors, (172), 57 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 11:46:51,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:46:51,551 INFO L93 Difference]: Finished difference Result 190 states and 194 transitions. [2021-05-06 11:46:51,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-06 11:46:51,551 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.9655172413793105) internal successors, (172), 57 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 11:46:51,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:46:51,552 INFO L225 Difference]: With dead ends: 190 [2021-05-06 11:46:51,552 INFO L226 Difference]: Without dead ends: 182 [2021-05-06 11:46:51,553 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 9 SyntacticMatches, 111 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1649 ImplicationChecksByTransitivity, 5994.8ms TimeCoverageRelationStatistics Valid=445, Invalid=12437, Unknown=0, NotChecked=0, Total=12882 [2021-05-06 11:46:51,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-05-06 11:46:51,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 181. [2021-05-06 11:46:51,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 176 states have (on average 1.0170454545454546) internal successors, (179), 176 states have internal predecessors, (179), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:46:51,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 183 transitions. [2021-05-06 11:46:51,588 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 183 transitions. Word has length 176 [2021-05-06 11:46:51,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:46:51,589 INFO L480 AbstractCegarLoop]: Abstraction has 181 states and 183 transitions. [2021-05-06 11:46:51,589 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 2.9655172413793105) internal successors, (172), 57 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 11:46:51,589 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 183 transitions. [2021-05-06 11:46:51,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2021-05-06 11:46:51,590 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:46:51,590 INFO L523 BasicCegarLoop]: trace histogram [56, 56, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:46:51,590 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable164 [2021-05-06 11:46:51,590 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:46:51,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:46:51,590 INFO L82 PathProgramCache]: Analyzing trace with hash -1720812475, now seen corresponding path program 55 times [2021-05-06 11:46:51,590 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:46:51,590 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [503976731] [2021-05-06 11:46:51,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:46:51,598 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:46:51,616 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:51,617 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:51,652 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:46:51,657 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:46:51,678 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:46:51,707 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 11:46:51,711 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:46:51,712 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:51,728 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:46:51,748 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:46:51,765 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 11:46:51,766 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:46:51,768 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:46:51,769 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:51,770 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:46:52,077 WARN L205 SmtUtils]: Spent 307.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 1 [2021-05-06 11:46:52,094 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:46:52,097 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:46:52,122 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:46:52,139 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 11:46:52,140 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:46:52,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:52,205 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:46:52,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:46:52,208 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:46:52,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:46:56,244 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:46:56,244 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [503976731] [2021-05-06 11:46:56,244 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [503976731] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:46:56,244 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:46:56,244 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [59] imperfect sequences [] total 59 [2021-05-06 11:46:56,244 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155703470] [2021-05-06 11:46:56,245 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-06 11:46:56,245 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:46:56,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-06 11:46:56,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=3367, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 11:46:56,245 INFO L87 Difference]: Start difference. First operand 181 states and 183 transitions. Second operand has 59 states, 59 states have (on average 2.9661016949152543) internal successors, (175), 58 states have internal predecessors, (175), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:47:01,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:47:02,000 INFO L93 Difference]: Finished difference Result 193 states and 197 transitions. [2021-05-06 11:47:02,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-06 11:47:02,000 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.9661016949152543) internal successors, (175), 58 states have internal predecessors, (175), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 179 [2021-05-06 11:47:02,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:47:02,001 INFO L225 Difference]: With dead ends: 193 [2021-05-06 11:47:02,001 INFO L226 Difference]: Without dead ends: 185 [2021-05-06 11:47:02,001 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 9 SyntacticMatches, 113 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1707 ImplicationChecksByTransitivity, 6250.5ms TimeCoverageRelationStatistics Valid=453, Invalid=12887, Unknown=0, NotChecked=0, Total=13340 [2021-05-06 11:47:02,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-05-06 11:47:02,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 184. [2021-05-06 11:47:02,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 179 states have (on average 1.0167597765363128) internal successors, (182), 179 states have internal predecessors, (182), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:47:02,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 186 transitions. [2021-05-06 11:47:02,044 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 186 transitions. Word has length 179 [2021-05-06 11:47:02,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:47:02,044 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 186 transitions. [2021-05-06 11:47:02,044 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 2.9661016949152543) internal successors, (175), 58 states have internal predecessors, (175), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:47:02,045 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 186 transitions. [2021-05-06 11:47:02,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2021-05-06 11:47:02,045 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:47:02,045 INFO L523 BasicCegarLoop]: trace histogram [57, 57, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:47:02,045 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable167 [2021-05-06 11:47:02,046 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:47:02,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:47:02,046 INFO L82 PathProgramCache]: Analyzing trace with hash 463063053, now seen corresponding path program 56 times [2021-05-06 11:47:02,046 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:47:02,046 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1855016476] [2021-05-06 11:47:02,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:47:02,053 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:47:02,055 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:02,056 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:02,136 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:47:02,139 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:47:02,163 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:47:02,185 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 11:47:02,188 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:47:02,211 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:02,220 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:47:02,230 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:47:02,246 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 11:47:02,247 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:47:02,249 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:47:02,250 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:02,251 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:02,288 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:47:02,291 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:47:02,316 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:47:02,335 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 11:47:02,336 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:47:02,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:02,387 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:47:02,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:02,392 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:47:02,395 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:47:06,522 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:47:06,522 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1855016476] [2021-05-06 11:47:06,522 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1855016476] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:47:06,522 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:47:06,522 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [60] imperfect sequences [] total 60 [2021-05-06 11:47:06,523 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858959038] [2021-05-06 11:47:06,523 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-06 11:47:06,523 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:47:06,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-06 11:47:06,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=3484, Unknown=0, NotChecked=0, Total=3660 [2021-05-06 11:47:06,523 INFO L87 Difference]: Start difference. First operand 184 states and 186 transitions. Second operand has 60 states, 60 states have (on average 2.966666666666667) internal successors, (178), 59 states have internal predecessors, (178), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:47:12,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:47:12,380 INFO L93 Difference]: Finished difference Result 196 states and 200 transitions. [2021-05-06 11:47:12,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-05-06 11:47:12,381 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.966666666666667) internal successors, (178), 59 states have internal predecessors, (178), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 182 [2021-05-06 11:47:12,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:47:12,382 INFO L225 Difference]: With dead ends: 196 [2021-05-06 11:47:12,382 INFO L226 Difference]: Without dead ends: 188 [2021-05-06 11:47:12,382 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 9 SyntacticMatches, 115 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1766 ImplicationChecksByTransitivity, 6391.3ms TimeCoverageRelationStatistics Valid=461, Invalid=13345, Unknown=0, NotChecked=0, Total=13806 [2021-05-06 11:47:12,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-05-06 11:47:12,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 187. [2021-05-06 11:47:12,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 182 states have (on average 1.0164835164835164) internal successors, (185), 182 states have internal predecessors, (185), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:47:12,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 189 transitions. [2021-05-06 11:47:12,415 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 189 transitions. Word has length 182 [2021-05-06 11:47:12,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:47:12,415 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 189 transitions. [2021-05-06 11:47:12,415 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 60 states have (on average 2.966666666666667) internal successors, (178), 59 states have internal predecessors, (178), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:47:12,415 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 189 transitions. [2021-05-06 11:47:12,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2021-05-06 11:47:12,416 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:47:12,416 INFO L523 BasicCegarLoop]: trace histogram [58, 58, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:47:12,416 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable170 [2021-05-06 11:47:12,416 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:47:12,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:47:12,416 INFO L82 PathProgramCache]: Analyzing trace with hash 134317893, now seen corresponding path program 57 times [2021-05-06 11:47:12,416 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:47:12,417 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1757426476] [2021-05-06 11:47:12,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:47:12,424 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:47:12,442 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:12,444 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:12,487 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:47:12,490 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:47:12,502 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:47:12,527 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 11:47:12,532 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:47:12,532 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:12,541 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:47:12,560 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:47:12,577 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 11:47:12,578 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:47:12,588 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:47:12,609 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:12,611 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:12,630 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:47:12,633 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:47:12,646 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:47:12,661 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 11:47:12,662 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:47:12,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:12,714 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:47:12,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:12,717 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:47:12,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:47:16,998 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:47:16,998 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1757426476] [2021-05-06 11:47:16,998 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1757426476] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:47:16,998 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:47:16,998 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [61] imperfect sequences [] total 61 [2021-05-06 11:47:16,998 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553035342] [2021-05-06 11:47:16,999 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2021-05-06 11:47:16,999 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:47:16,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-05-06 11:47:16,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=3603, Unknown=0, NotChecked=0, Total=3782 [2021-05-06 11:47:16,999 INFO L87 Difference]: Start difference. First operand 187 states and 189 transitions. Second operand has 61 states, 61 states have (on average 2.9672131147540983) internal successors, (181), 60 states have internal predecessors, (181), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:47:23,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:47:23,096 INFO L93 Difference]: Finished difference Result 199 states and 203 transitions. [2021-05-06 11:47:23,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-06 11:47:23,096 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.9672131147540983) internal successors, (181), 60 states have internal predecessors, (181), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 185 [2021-05-06 11:47:23,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:47:23,097 INFO L225 Difference]: With dead ends: 199 [2021-05-06 11:47:23,097 INFO L226 Difference]: Without dead ends: 191 [2021-05-06 11:47:23,098 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 10 SyntacticMatches, 116 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1826 ImplicationChecksByTransitivity, 6637.6ms TimeCoverageRelationStatistics Valid=469, Invalid=13811, Unknown=0, NotChecked=0, Total=14280 [2021-05-06 11:47:23,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-05-06 11:47:23,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 190. [2021-05-06 11:47:23,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 185 states have (on average 1.0162162162162163) internal successors, (188), 185 states have internal predecessors, (188), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:47:23,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 192 transitions. [2021-05-06 11:47:23,150 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 192 transitions. Word has length 185 [2021-05-06 11:47:23,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:47:23,150 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 192 transitions. [2021-05-06 11:47:23,150 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 61 states, 61 states have (on average 2.9672131147540983) internal successors, (181), 60 states have internal predecessors, (181), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:47:23,150 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 192 transitions. [2021-05-06 11:47:23,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2021-05-06 11:47:23,151 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:47:23,151 INFO L523 BasicCegarLoop]: trace histogram [59, 59, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:47:23,151 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable173 [2021-05-06 11:47:23,151 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:47:23,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:47:23,151 INFO L82 PathProgramCache]: Analyzing trace with hash -987308787, now seen corresponding path program 58 times [2021-05-06 11:47:23,151 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:47:23,151 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [626769793] [2021-05-06 11:47:23,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:47:23,159 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:47:23,160 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:23,161 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:23,184 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:47:23,186 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:47:23,212 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:47:23,233 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 11:47:23,236 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:47:23,236 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:23,246 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:47:23,265 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:47:23,281 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 11:47:23,282 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:47:23,284 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:47:23,309 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:23,310 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:23,351 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:47:23,354 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:47:23,365 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:47:23,381 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 11:47:23,382 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:47:23,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:23,430 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:47:23,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:23,433 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:47:23,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:47:27,989 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:47:27,989 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [626769793] [2021-05-06 11:47:27,989 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [626769793] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:47:27,989 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:47:27,990 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [62] imperfect sequences [] total 62 [2021-05-06 11:47:27,990 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64663362] [2021-05-06 11:47:27,990 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-06 11:47:27,990 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:47:27,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-06 11:47:27,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=3724, Unknown=0, NotChecked=0, Total=3906 [2021-05-06 11:47:27,990 INFO L87 Difference]: Start difference. First operand 190 states and 192 transitions. Second operand has 62 states, 62 states have (on average 2.967741935483871) internal successors, (184), 61 states have internal predecessors, (184), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:47:34,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:47:34,226 INFO L93 Difference]: Finished difference Result 202 states and 206 transitions. [2021-05-06 11:47:34,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-06 11:47:34,226 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.967741935483871) internal successors, (184), 61 states have internal predecessors, (184), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 188 [2021-05-06 11:47:34,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:47:34,227 INFO L225 Difference]: With dead ends: 202 [2021-05-06 11:47:34,227 INFO L226 Difference]: Without dead ends: 194 [2021-05-06 11:47:34,227 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 9 SyntacticMatches, 119 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1887 ImplicationChecksByTransitivity, 6944.1ms TimeCoverageRelationStatistics Valid=477, Invalid=14285, Unknown=0, NotChecked=0, Total=14762 [2021-05-06 11:47:34,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-05-06 11:47:34,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 193. [2021-05-06 11:47:34,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 188 states have (on average 1.0159574468085106) internal successors, (191), 188 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 11:47:34,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 195 transitions. [2021-05-06 11:47:34,264 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 195 transitions. Word has length 188 [2021-05-06 11:47:34,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:47:34,265 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 195 transitions. [2021-05-06 11:47:34,265 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 62 states, 62 states have (on average 2.967741935483871) internal successors, (184), 61 states have internal predecessors, (184), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:47:34,265 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 195 transitions. [2021-05-06 11:47:34,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-05-06 11:47:34,265 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:47:34,265 INFO L523 BasicCegarLoop]: trace histogram [60, 60, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:47:34,265 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable176 [2021-05-06 11:47:34,266 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:47:34,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:47:34,266 INFO L82 PathProgramCache]: Analyzing trace with hash -522169787, now seen corresponding path program 59 times [2021-05-06 11:47:34,266 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:47:34,266 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1812301391] [2021-05-06 11:47:34,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:47:34,276 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:47:34,291 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:34,292 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:34,332 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:47:34,335 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:47:34,348 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:47:34,368 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 11:47:34,372 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:47:34,382 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:34,391 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:47:34,400 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:47:34,417 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 11:47:34,418 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:47:34,420 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:47:34,421 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:34,424 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:34,604 WARN L205 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:47:34,618 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:47:34,621 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:47:34,648 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:47:34,666 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 11:47:34,667 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:47:34,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:34,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:47:34,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:34,723 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:47:34,726 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:47:39,270 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:47:39,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1812301391] [2021-05-06 11:47:39,270 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1812301391] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:47:39,270 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:47:39,270 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [63] imperfect sequences [] total 63 [2021-05-06 11:47:39,270 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226147769] [2021-05-06 11:47:39,271 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-06 11:47:39,271 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:47:39,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-06 11:47:39,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=3847, Unknown=0, NotChecked=0, Total=4032 [2021-05-06 11:47:39,271 INFO L87 Difference]: Start difference. First operand 193 states and 195 transitions. Second operand has 63 states, 63 states have (on average 2.9682539682539684) internal successors, (187), 62 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 11:47:45,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:47:45,729 INFO L93 Difference]: Finished difference Result 205 states and 209 transitions. [2021-05-06 11:47:45,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-06 11:47:45,729 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 2.9682539682539684) internal successors, (187), 62 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 11:47:45,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:47:45,730 INFO L225 Difference]: With dead ends: 205 [2021-05-06 11:47:45,730 INFO L226 Difference]: Without dead ends: 197 [2021-05-06 11:47:45,731 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 9 SyntacticMatches, 121 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1949 ImplicationChecksByTransitivity, 7024.1ms TimeCoverageRelationStatistics Valid=485, Invalid=14767, Unknown=0, NotChecked=0, Total=15252 [2021-05-06 11:47:45,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-05-06 11:47:45,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 196. [2021-05-06 11:47:45,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 191 states have (on average 1.0157068062827226) internal successors, (194), 191 states have internal predecessors, (194), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:47:45,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 198 transitions. [2021-05-06 11:47:45,782 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 198 transitions. Word has length 191 [2021-05-06 11:47:45,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:47:45,782 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 198 transitions. [2021-05-06 11:47:45,782 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 63 states, 63 states have (on average 2.9682539682539684) internal successors, (187), 62 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 11:47:45,782 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 198 transitions. [2021-05-06 11:47:45,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2021-05-06 11:47:45,783 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:47:45,783 INFO L523 BasicCegarLoop]: trace histogram [61, 61, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:47:45,783 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable179 [2021-05-06 11:47:45,783 INFO L428 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:47:45,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:47:45,783 INFO L82 PathProgramCache]: Analyzing trace with hash 869282317, now seen corresponding path program 60 times [2021-05-06 11:47:45,783 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:47:45,784 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1381171116] [2021-05-06 11:47:45,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:47:45,791 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:47:45,809 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:45,811 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:45,854 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:47:45,859 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:47:45,875 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:47:45,912 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 11:47:45,917 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:47:45,917 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:45,930 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:47:45,955 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:47:45,972 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 11:47:45,973 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:47:45,975 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:47:45,991 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:45,992 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:46,182 WARN L205 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 1 [2021-05-06 11:47:46,195 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:47:46,201 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:47:46,214 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:47:46,230 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 11:47:46,231 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:47:46,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:46,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:47:46,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:46,280 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:47:46,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:47:50,910 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:47:50,910 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1381171116] [2021-05-06 11:47:50,910 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1381171116] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:47:50,910 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:47:50,910 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [64] imperfect sequences [] total 64 [2021-05-06 11:47:50,910 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153845878] [2021-05-06 11:47:50,910 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-06 11:47:50,910 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:47:50,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-06 11:47:50,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=3972, Unknown=0, NotChecked=0, Total=4160 [2021-05-06 11:47:50,911 INFO L87 Difference]: Start difference. First operand 196 states and 198 transitions. Second operand has 64 states, 64 states have (on average 2.96875) internal successors, (190), 63 states have internal predecessors, (190), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:47:57,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:47:57,700 INFO L93 Difference]: Finished difference Result 208 states and 212 transitions. [2021-05-06 11:47:57,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-05-06 11:47:57,700 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.96875) internal successors, (190), 63 states have internal predecessors, (190), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 194 [2021-05-06 11:47:57,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:47:57,701 INFO L225 Difference]: With dead ends: 208 [2021-05-06 11:47:57,701 INFO L226 Difference]: Without dead ends: 200 [2021-05-06 11:47:57,702 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 10 SyntacticMatches, 122 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2012 ImplicationChecksByTransitivity, 7263.5ms TimeCoverageRelationStatistics Valid=493, Invalid=15257, Unknown=0, NotChecked=0, Total=15750 [2021-05-06 11:47:57,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-05-06 11:47:57,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 199. [2021-05-06 11:47:57,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 194 states have (on average 1.0154639175257731) internal successors, (197), 194 states have internal predecessors, (197), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:47:57,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 201 transitions. [2021-05-06 11:47:57,750 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 201 transitions. Word has length 194 [2021-05-06 11:47:57,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:47:57,751 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 201 transitions. [2021-05-06 11:47:57,751 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 64 states, 64 states have (on average 2.96875) internal successors, (190), 63 states have internal predecessors, (190), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:47:57,751 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 201 transitions. [2021-05-06 11:47:57,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2021-05-06 11:47:57,752 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:47:57,752 INFO L523 BasicCegarLoop]: trace histogram [62, 62, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:47:57,752 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable182 [2021-05-06 11:47:57,752 INFO L428 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:47:57,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:47:57,752 INFO L82 PathProgramCache]: Analyzing trace with hash -1405428411, now seen corresponding path program 61 times [2021-05-06 11:47:57,752 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:47:57,752 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2037223307] [2021-05-06 11:47:57,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:47:57,760 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:47:57,775 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:57,776 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:57,798 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:47:57,801 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:47:57,813 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:47:57,834 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 11:47:57,837 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:47:57,848 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:57,858 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:47:57,867 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:47:57,883 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 11:47:57,884 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:47:57,886 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:47:57,887 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:57,888 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:47:57,914 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:47:57,917 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:47:57,943 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:47:57,959 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 11:47:57,960 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:47:57,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:58,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:47:58,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:47:58,015 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:47:58,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:48:02,870 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:48:02,870 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2037223307] [2021-05-06 11:48:02,870 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2037223307] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:48:02,870 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:48:02,870 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [65] imperfect sequences [] total 65 [2021-05-06 11:48:02,871 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743440548] [2021-05-06 11:48:02,871 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-06 11:48:02,871 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:48:02,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-06 11:48:02,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=4099, Unknown=0, NotChecked=0, Total=4290 [2021-05-06 11:48:02,872 INFO L87 Difference]: Start difference. First operand 199 states and 201 transitions. Second operand has 65 states, 65 states have (on average 2.9692307692307693) internal successors, (193), 64 states have internal predecessors, (193), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:48:09,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:48:09,715 INFO L93 Difference]: Finished difference Result 211 states and 215 transitions. [2021-05-06 11:48:09,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-05-06 11:48:09,715 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 2.9692307692307693) internal successors, (193), 64 states have internal predecessors, (193), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 197 [2021-05-06 11:48:09,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:48:09,716 INFO L225 Difference]: With dead ends: 211 [2021-05-06 11:48:09,716 INFO L226 Difference]: Without dead ends: 203 [2021-05-06 11:48:09,717 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 9 SyntacticMatches, 125 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2076 ImplicationChecksByTransitivity, 7473.8ms TimeCoverageRelationStatistics Valid=501, Invalid=15755, Unknown=0, NotChecked=0, Total=16256 [2021-05-06 11:48:09,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2021-05-06 11:48:09,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 202. [2021-05-06 11:48:09,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 197 states have (on average 1.015228426395939) internal successors, (200), 197 states have internal predecessors, (200), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:48:09,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 204 transitions. [2021-05-06 11:48:09,757 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 204 transitions. Word has length 197 [2021-05-06 11:48:09,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:48:09,757 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 204 transitions. [2021-05-06 11:48:09,757 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 65 states have (on average 2.9692307692307693) internal successors, (193), 64 states have internal predecessors, (193), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:48:09,757 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 204 transitions. [2021-05-06 11:48:09,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2021-05-06 11:48:09,758 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:48:09,758 INFO L523 BasicCegarLoop]: trace histogram [63, 63, 62, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:48:09,758 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable185 [2021-05-06 11:48:09,758 INFO L428 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:48:09,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:48:09,759 INFO L82 PathProgramCache]: Analyzing trace with hash -1318729971, now seen corresponding path program 62 times [2021-05-06 11:48:09,759 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:48:09,759 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2142356292] [2021-05-06 11:48:09,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:48:09,775 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:48:09,776 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:48:09,777 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:48:09,865 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:48:09,868 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:48:09,893 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:48:09,915 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 11:48:09,919 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:48:09,919 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:48:09,931 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:48:09,951 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:48:09,968 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 11:48:09,969 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:48:09,971 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:48:09,972 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:48:09,973 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:48:10,000 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:48:10,005 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:48:10,039 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:48:10,062 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 11:48:10,064 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:48:10,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:48:10,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:48:10,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:48:10,117 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:48:10,120 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:48:15,028 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:48:15,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2142356292] [2021-05-06 11:48:15,029 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2142356292] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:48:15,029 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:48:15,029 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [66] imperfect sequences [] total 66 [2021-05-06 11:48:15,029 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1357806571] [2021-05-06 11:48:15,029 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-06 11:48:15,029 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:48:15,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-06 11:48:15,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=4228, Unknown=0, NotChecked=0, Total=4422 [2021-05-06 11:48:15,030 INFO L87 Difference]: Start difference. First operand 202 states and 204 transitions. Second operand has 66 states, 66 states have (on average 2.9696969696969697) internal successors, (196), 65 states have internal predecessors, (196), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:48:22,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:48:22,074 INFO L93 Difference]: Finished difference Result 214 states and 218 transitions. [2021-05-06 11:48:22,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-05-06 11:48:22,075 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.9696969696969697) internal successors, (196), 65 states have internal predecessors, (196), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 200 [2021-05-06 11:48:22,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:48:22,075 INFO L225 Difference]: With dead ends: 214 [2021-05-06 11:48:22,075 INFO L226 Difference]: Without dead ends: 206 [2021-05-06 11:48:22,076 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 9 SyntacticMatches, 127 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2141 ImplicationChecksByTransitivity, 7583.3ms TimeCoverageRelationStatistics Valid=509, Invalid=16261, Unknown=0, NotChecked=0, Total=16770 [2021-05-06 11:48:22,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2021-05-06 11:48:22,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 205. [2021-05-06 11:48:22,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 200 states have (on average 1.015) internal successors, (203), 200 states have internal predecessors, (203), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:48:22,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 207 transitions. [2021-05-06 11:48:22,112 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 207 transitions. Word has length 200 [2021-05-06 11:48:22,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:48:22,112 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 207 transitions. [2021-05-06 11:48:22,112 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 66 states, 66 states have (on average 2.9696969696969697) internal successors, (196), 65 states have internal predecessors, (196), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:48:22,112 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 207 transitions. [2021-05-06 11:48:22,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2021-05-06 11:48:22,113 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:48:22,113 INFO L523 BasicCegarLoop]: trace histogram [64, 64, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:48:22,113 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable188 [2021-05-06 11:48:22,113 INFO L428 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:48:22,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:48:22,113 INFO L82 PathProgramCache]: Analyzing trace with hash 239151173, now seen corresponding path program 63 times [2021-05-06 11:48:22,113 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:48:22,114 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1798665680] [2021-05-06 11:48:22,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:48:22,120 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:48:22,120 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:48:22,121 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:48:22,150 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:48:22,153 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:48:22,177 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:48:22,199 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 11:48:22,202 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:48:22,202 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:48:22,213 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:48:22,232 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:48:22,248 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 11:48:22,249 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:48:22,251 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:48:22,267 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:48:22,269 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:48:22,320 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:48:22,326 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:48:22,340 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:48:22,362 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 11:48:22,363 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:48:22,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:48:22,417 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:48:22,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:48:22,420 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 11:48:22,422 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:48:27,566 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:48:27,566 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1798665680] [2021-05-06 11:48:27,566 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1798665680] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:48:27,566 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:48:27,566 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [67] imperfect sequences [] total 67 [2021-05-06 11:48:27,566 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496306604] [2021-05-06 11:48:27,566 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2021-05-06 11:48:27,566 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:48:27,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-05-06 11:48:27,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=4359, Unknown=0, NotChecked=0, Total=4556 [2021-05-06 11:48:27,567 INFO L87 Difference]: Start difference. First operand 205 states and 207 transitions. Second operand has 67 states, 67 states have (on average 2.970149253731343) internal successors, (199), 66 states have internal predecessors, (199), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:48:34,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:48:34,809 INFO L93 Difference]: Finished difference Result 217 states and 221 transitions. [2021-05-06 11:48:34,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-05-06 11:48:34,810 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 2.970149253731343) internal successors, (199), 66 states have internal predecessors, (199), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 203 [2021-05-06 11:48:34,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:48:34,811 INFO L225 Difference]: With dead ends: 217 [2021-05-06 11:48:34,811 INFO L226 Difference]: Without dead ends: 209 [2021-05-06 11:48:34,811 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 10 SyntacticMatches, 128 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2207 ImplicationChecksByTransitivity, 7894.4ms TimeCoverageRelationStatistics Valid=517, Invalid=16775, Unknown=0, NotChecked=0, Total=17292 [2021-05-06 11:48:34,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-05-06 11:48:34,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 208. [2021-05-06 11:48:34,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 203 states have (on average 1.0147783251231528) internal successors, (206), 203 states have internal predecessors, (206), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:48:34,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 210 transitions. [2021-05-06 11:48:34,848 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 210 transitions. Word has length 203 [2021-05-06 11:48:34,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:48:34,848 INFO L480 AbstractCegarLoop]: Abstraction has 208 states and 210 transitions. [2021-05-06 11:48:34,848 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 67 states, 67 states have (on average 2.970149253731343) internal successors, (199), 66 states have internal predecessors, (199), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:48:34,848 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 210 transitions. [2021-05-06 11:48:34,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2021-05-06 11:48:34,849 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:48:34,849 INFO L523 BasicCegarLoop]: trace histogram [65, 65, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:48:34,849 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable191 [2021-05-06 11:48:34,849 INFO L428 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:48:34,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:48:34,849 INFO L82 PathProgramCache]: Analyzing trace with hash -340288499, now seen corresponding path program 64 times [2021-05-06 11:48:34,849 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:48:34,850 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1330927527] [2021-05-06 11:48:34,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:48:34,858 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:48:34,874 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:48:34,875 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:48:34,892 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:48:34,895 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:48:34,907 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:48:34,997 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 11:48:35,001 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:48:35,002 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:48:35,016 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:48:35,036 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:48:35,052 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 11:48:35,054 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:48:35,056 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:48:35,073 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:48:35,074 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:48:35,148 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:48:35,150 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:48:35,166 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:48:35,183 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 11:48:35,184 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:48:35,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:48:35,244 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:48:35,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:48:35,246 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:48:35,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:48:40,548 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:48:40,549 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1330927527] [2021-05-06 11:48:40,549 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1330927527] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:48:40,549 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:48:40,549 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [68] imperfect sequences [] total 68 [2021-05-06 11:48:40,549 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908540882] [2021-05-06 11:48:40,549 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2021-05-06 11:48:40,549 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:48:40,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-05-06 11:48:40,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=4492, Unknown=0, NotChecked=0, Total=4692 [2021-05-06 11:48:40,550 INFO L87 Difference]: Start difference. First operand 208 states and 210 transitions. Second operand has 68 states, 68 states have (on average 2.9705882352941178) internal successors, (202), 67 states have internal predecessors, (202), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:48:48,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:48:48,041 INFO L93 Difference]: Finished difference Result 220 states and 224 transitions. [2021-05-06 11:48:48,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-05-06 11:48:48,041 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 2.9705882352941178) internal successors, (202), 67 states have internal predecessors, (202), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 206 [2021-05-06 11:48:48,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:48:48,042 INFO L225 Difference]: With dead ends: 220 [2021-05-06 11:48:48,042 INFO L226 Difference]: Without dead ends: 212 [2021-05-06 11:48:48,043 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 9 SyntacticMatches, 131 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2274 ImplicationChecksByTransitivity, 8167.3ms TimeCoverageRelationStatistics Valid=525, Invalid=17297, Unknown=0, NotChecked=0, Total=17822 [2021-05-06 11:48:48,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-05-06 11:48:48,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 211. [2021-05-06 11:48:48,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 206 states have (on average 1.0145631067961165) internal successors, (209), 206 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 11:48:48,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 213 transitions. [2021-05-06 11:48:48,086 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 213 transitions. Word has length 206 [2021-05-06 11:48:48,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:48:48,086 INFO L480 AbstractCegarLoop]: Abstraction has 211 states and 213 transitions. [2021-05-06 11:48:48,086 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 68 states, 68 states have (on average 2.9705882352941178) internal successors, (202), 67 states have internal predecessors, (202), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:48:48,086 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 213 transitions. [2021-05-06 11:48:48,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2021-05-06 11:48:48,087 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:48:48,087 INFO L523 BasicCegarLoop]: trace histogram [66, 66, 65, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:48:48,087 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable194 [2021-05-06 11:48:48,087 INFO L428 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:48:48,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:48:48,088 INFO L82 PathProgramCache]: Analyzing trace with hash -953994427, now seen corresponding path program 65 times [2021-05-06 11:48:48,088 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:48:48,088 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1616155817] [2021-05-06 11:48:48,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:48:48,095 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:48:48,111 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:48:48,113 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:48:48,145 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:48:48,149 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:48:48,161 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:48:48,182 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 11:48:48,186 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:48:48,186 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:48:48,199 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:48:48,219 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:48:48,235 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 11:48:48,236 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:48:48,238 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:48:48,254 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:48:48,255 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:48:48,310 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:48:48,315 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:48:48,327 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:48:48,345 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 11:48:48,346 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:48:48,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:48:48,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:48:48,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:48:48,398 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:48:48,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:48:53,839 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:48:53,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1616155817] [2021-05-06 11:48:53,840 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1616155817] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:48:53,840 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:48:53,840 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [69] imperfect sequences [] total 69 [2021-05-06 11:48:53,840 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1572877250] [2021-05-06 11:48:53,840 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2021-05-06 11:48:53,840 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:48:53,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-05-06 11:48:53,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=4627, Unknown=0, NotChecked=0, Total=4830 [2021-05-06 11:48:53,841 INFO L87 Difference]: Start difference. First operand 211 states and 213 transitions. Second operand has 69 states, 69 states have (on average 2.971014492753623) internal successors, (205), 68 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 11:49:01,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:49:01,512 INFO L93 Difference]: Finished difference Result 223 states and 227 transitions. [2021-05-06 11:49:01,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-05-06 11:49:01,512 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 2.971014492753623) internal successors, (205), 68 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 11:49:01,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:49:01,513 INFO L225 Difference]: With dead ends: 223 [2021-05-06 11:49:01,513 INFO L226 Difference]: Without dead ends: 215 [2021-05-06 11:49:01,513 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 9 SyntacticMatches, 133 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2342 ImplicationChecksByTransitivity, 8327.8ms TimeCoverageRelationStatistics Valid=533, Invalid=17827, Unknown=0, NotChecked=0, Total=18360 [2021-05-06 11:49:01,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2021-05-06 11:49:01,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 214. [2021-05-06 11:49:01,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 209 states have (on average 1.014354066985646) internal successors, (212), 209 states have internal predecessors, (212), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:49:01,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 216 transitions. [2021-05-06 11:49:01,571 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 216 transitions. Word has length 209 [2021-05-06 11:49:01,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:49:01,571 INFO L480 AbstractCegarLoop]: Abstraction has 214 states and 216 transitions. [2021-05-06 11:49:01,572 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 69 states, 69 states have (on average 2.971014492753623) internal successors, (205), 68 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 11:49:01,572 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 216 transitions. [2021-05-06 11:49:01,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2021-05-06 11:49:01,572 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:49:01,573 INFO L523 BasicCegarLoop]: trace histogram [67, 67, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:49:01,573 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable197 [2021-05-06 11:49:01,573 INFO L428 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:49:01,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:49:01,573 INFO L82 PathProgramCache]: Analyzing trace with hash -191516403, now seen corresponding path program 66 times [2021-05-06 11:49:01,573 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:49:01,573 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [248725214] [2021-05-06 11:49:01,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:49:01,581 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:49:01,599 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:49:01,600 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:49:01,620 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:49:01,623 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:49:01,634 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:49:01,655 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 11:49:01,658 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:49:01,659 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:49:01,669 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:49:01,689 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:49:01,705 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 11:49:01,705 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:49:01,714 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:49:01,729 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:49:01,730 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:49:01,748 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:49:01,751 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:49:01,763 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:49:01,779 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 11:49:01,780 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:49:01,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:49:01,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:49:01,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:49:01,836 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:49:01,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:49:07,521 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:49:07,522 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [248725214] [2021-05-06 11:49:07,522 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [248725214] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:49:07,522 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:49:07,522 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [70] imperfect sequences [] total 70 [2021-05-06 11:49:07,522 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [237048295] [2021-05-06 11:49:07,522 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2021-05-06 11:49:07,522 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:49:07,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-05-06 11:49:07,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=4764, Unknown=0, NotChecked=0, Total=4970 [2021-05-06 11:49:07,523 INFO L87 Difference]: Start difference. First operand 214 states and 216 transitions. Second operand has 70 states, 70 states have (on average 2.9714285714285715) internal successors, (208), 69 states have internal predecessors, (208), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:49:15,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:49:15,455 INFO L93 Difference]: Finished difference Result 226 states and 230 transitions. [2021-05-06 11:49:15,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-05-06 11:49:15,456 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 2.9714285714285715) internal successors, (208), 69 states have internal predecessors, (208), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 212 [2021-05-06 11:49:15,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:49:15,456 INFO L225 Difference]: With dead ends: 226 [2021-05-06 11:49:15,456 INFO L226 Difference]: Without dead ends: 218 [2021-05-06 11:49:15,457 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 10 SyntacticMatches, 134 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2411 ImplicationChecksByTransitivity, 8674.5ms TimeCoverageRelationStatistics Valid=541, Invalid=18365, Unknown=0, NotChecked=0, Total=18906 [2021-05-06 11:49:15,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2021-05-06 11:49:15,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 217. [2021-05-06 11:49:15,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 212 states have (on average 1.0141509433962264) internal successors, (215), 212 states have internal predecessors, (215), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:49:15,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 219 transitions. [2021-05-06 11:49:15,501 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 219 transitions. Word has length 212 [2021-05-06 11:49:15,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:49:15,501 INFO L480 AbstractCegarLoop]: Abstraction has 217 states and 219 transitions. [2021-05-06 11:49:15,501 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 70 states, 70 states have (on average 2.9714285714285715) internal successors, (208), 69 states have internal predecessors, (208), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:49:15,501 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 219 transitions. [2021-05-06 11:49:15,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2021-05-06 11:49:15,502 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:49:15,502 INFO L523 BasicCegarLoop]: trace histogram [68, 68, 67, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:49:15,502 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable200 [2021-05-06 11:49:15,502 INFO L428 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:49:15,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:49:15,502 INFO L82 PathProgramCache]: Analyzing trace with hash -1290731963, now seen corresponding path program 67 times [2021-05-06 11:49:15,503 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:49:15,503 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [665998301] [2021-05-06 11:49:15,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:49:15,519 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:49:15,537 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:49:15,539 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:49:15,634 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:49:15,638 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:49:15,661 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:49:15,688 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 11:49:15,692 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:49:15,693 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:49:15,708 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:49:15,733 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:49:15,754 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 11:49:15,755 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:49:15,758 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:49:15,777 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:49:15,779 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:49:15,817 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:49:15,822 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:49:15,840 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:49:15,861 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 11:49:15,862 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:49:15,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:49:15,938 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:49:15,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:49:15,941 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:49:15,944 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:49:21,750 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:49:21,750 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [665998301] [2021-05-06 11:49:21,750 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [665998301] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:49:21,750 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:49:21,750 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [71] imperfect sequences [] total 71 [2021-05-06 11:49:21,750 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738907218] [2021-05-06 11:49:21,751 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2021-05-06 11:49:21,751 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:49:21,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-05-06 11:49:21,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=4903, Unknown=0, NotChecked=0, Total=5112 [2021-05-06 11:49:21,751 INFO L87 Difference]: Start difference. First operand 217 states and 219 transitions. Second operand has 71 states, 71 states have (on average 2.971830985915493) internal successors, (211), 70 states have internal predecessors, (211), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:49:29,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:49:30,051 INFO L93 Difference]: Finished difference Result 229 states and 233 transitions. [2021-05-06 11:49:30,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-06 11:49:30,052 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 2.971830985915493) internal successors, (211), 70 states have internal predecessors, (211), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 215 [2021-05-06 11:49:30,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:49:30,053 INFO L225 Difference]: With dead ends: 229 [2021-05-06 11:49:30,053 INFO L226 Difference]: Without dead ends: 221 [2021-05-06 11:49:30,057 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 9 SyntacticMatches, 137 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2481 ImplicationChecksByTransitivity, 8911.1ms TimeCoverageRelationStatistics Valid=549, Invalid=18911, Unknown=0, NotChecked=0, Total=19460 [2021-05-06 11:49:30,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2021-05-06 11:49:30,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 220. [2021-05-06 11:49:30,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 215 states have (on average 1.013953488372093) internal successors, (218), 215 states have internal predecessors, (218), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:49:30,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 222 transitions. [2021-05-06 11:49:30,137 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 222 transitions. Word has length 215 [2021-05-06 11:49:30,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:49:30,137 INFO L480 AbstractCegarLoop]: Abstraction has 220 states and 222 transitions. [2021-05-06 11:49:30,138 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 71 states, 71 states have (on average 2.971830985915493) internal successors, (211), 70 states have internal predecessors, (211), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:49:30,138 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 222 transitions. [2021-05-06 11:49:30,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2021-05-06 11:49:30,139 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:49:30,139 INFO L523 BasicCegarLoop]: trace histogram [69, 69, 68, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:49:30,139 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable203 [2021-05-06 11:49:30,139 INFO L428 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:49:30,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:49:30,139 INFO L82 PathProgramCache]: Analyzing trace with hash 1104152077, now seen corresponding path program 68 times [2021-05-06 11:49:30,139 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:49:30,139 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [457607123] [2021-05-06 11:49:30,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:49:30,147 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:49:30,148 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:49:30,149 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:49:30,260 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:49:30,276 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:49:30,280 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:49:30,313 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:49:30,340 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 11:49:30,344 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:49:30,344 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:49:30,359 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:49:30,383 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:49:30,405 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 11:49:30,406 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:49:30,410 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:49:30,429 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:49:30,431 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:49:30,465 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:49:30,469 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:49:30,486 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:49:30,507 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 11:49:30,509 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:49:30,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:49:30,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:49:30,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:49:30,613 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:49:30,616 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:49:43,156 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:49:43,156 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [457607123] [2021-05-06 11:49:43,156 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [457607123] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:49:43,156 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:49:43,156 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [140] imperfect sequences [] total 140 [2021-05-06 11:49:43,156 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [371859299] [2021-05-06 11:49:43,157 INFO L460 AbstractCegarLoop]: Interpolant automaton has 140 states [2021-05-06 11:49:43,157 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:49:43,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2021-05-06 11:49:43,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=416, Invalid=19324, Unknown=0, NotChecked=0, Total=19740 [2021-05-06 11:49:43,158 INFO L87 Difference]: Start difference. First operand 220 states and 222 transitions. Second operand has 140 states, 140 states have (on average 1.5285714285714285) internal successors, (214), 139 states have internal predecessors, (214), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:50:04,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:50:04,094 INFO L93 Difference]: Finished difference Result 231 states and 235 transitions. [2021-05-06 11:50:04,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 140 states. [2021-05-06 11:50:04,094 INFO L78 Accepts]: Start accepts. Automaton has has 140 states, 140 states have (on average 1.5285714285714285) internal successors, (214), 139 states have internal predecessors, (214), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 218 [2021-05-06 11:50:04,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:50:04,095 INFO L225 Difference]: With dead ends: 231 [2021-05-06 11:50:04,095 INFO L226 Difference]: Without dead ends: 223 [2021-05-06 11:50:04,098 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 11 SyntacticMatches, 70 SemanticMatches, 276 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9522 ImplicationChecksByTransitivity, 23775.8ms TimeCoverageRelationStatistics Valid=1101, Invalid=75905, Unknown=0, NotChecked=0, Total=77006 [2021-05-06 11:50:04,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2021-05-06 11:50:04,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 223. [2021-05-06 11:50:04,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 223 states, 218 states have (on average 1.0137614678899083) internal successors, (221), 218 states have internal predecessors, (221), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:50:04,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 225 transitions. [2021-05-06 11:50:04,139 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 225 transitions. Word has length 218 [2021-05-06 11:50:04,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:50:04,140 INFO L480 AbstractCegarLoop]: Abstraction has 223 states and 225 transitions. [2021-05-06 11:50:04,140 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 140 states, 140 states have (on average 1.5285714285714285) internal successors, (214), 139 states have internal predecessors, (214), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:50:04,140 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 225 transitions. [2021-05-06 11:50:04,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2021-05-06 11:50:04,140 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:50:04,141 INFO L523 BasicCegarLoop]: trace histogram [70, 70, 69, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:50:04,141 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable206 [2021-05-06 11:50:04,141 INFO L428 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:50:04,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:50:04,141 INFO L82 PathProgramCache]: Analyzing trace with hash -902133435, now seen corresponding path program 69 times [2021-05-06 11:50:04,141 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:50:04,141 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1241872549] [2021-05-06 11:50:04,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:50:04,150 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:50:04,166 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:50:04,167 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:50:05,271 WARN L205 SmtUtils]: Spent 1.10 s on a formula simplification. DAG size of input: 14 DAG size of output: 1 [2021-05-06 11:50:05,283 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:50:05,286 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:50:05,298 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:50:05,321 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 11:50:05,325 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:50:05,325 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:50:05,337 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:50:05,356 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:50:05,374 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 11:50:05,375 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:50:05,381 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:50:05,382 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:50:05,383 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:50:05,409 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:50:05,413 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:50:05,438 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:50:05,455 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 11:50:05,456 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:50:05,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:50:05,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:50:05,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:50:05,516 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:50:05,518 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:50:11,628 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:50:11,629 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1241872549] [2021-05-06 11:50:11,629 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1241872549] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:50:11,629 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:50:11,629 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [73] imperfect sequences [] total 73 [2021-05-06 11:50:11,629 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671488530] [2021-05-06 11:50:11,629 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2021-05-06 11:50:11,629 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:50:11,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-05-06 11:50:11,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=5187, Unknown=0, NotChecked=0, Total=5402 [2021-05-06 11:50:11,630 INFO L87 Difference]: Start difference. First operand 223 states and 225 transitions. Second operand has 73 states, 73 states have (on average 2.9726027397260273) internal successors, (217), 72 states have internal predecessors, (217), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:50:20,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:50:20,236 INFO L93 Difference]: Finished difference Result 235 states and 239 transitions. [2021-05-06 11:50:20,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-05-06 11:50:20,241 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 2.9726027397260273) internal successors, (217), 72 states have internal predecessors, (217), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 221 [2021-05-06 11:50:20,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:50:20,241 INFO L225 Difference]: With dead ends: 235 [2021-05-06 11:50:20,241 INFO L226 Difference]: Without dead ends: 227 [2021-05-06 11:50:20,242 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 9 SyntacticMatches, 141 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2624 ImplicationChecksByTransitivity, 9323.1ms TimeCoverageRelationStatistics Valid=565, Invalid=20027, Unknown=0, NotChecked=0, Total=20592 [2021-05-06 11:50:20,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-05-06 11:50:20,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 226. [2021-05-06 11:50:20,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 221 states have (on average 1.0135746606334841) internal successors, (224), 221 states have internal predecessors, (224), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:50:20,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 228 transitions. [2021-05-06 11:50:20,287 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 228 transitions. Word has length 221 [2021-05-06 11:50:20,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:50:20,287 INFO L480 AbstractCegarLoop]: Abstraction has 226 states and 228 transitions. [2021-05-06 11:50:20,288 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 73 states, 73 states have (on average 2.9726027397260273) internal successors, (217), 72 states have internal predecessors, (217), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:50:20,288 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 228 transitions. [2021-05-06 11:50:20,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2021-05-06 11:50:20,288 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:50:20,289 INFO L523 BasicCegarLoop]: trace histogram [71, 71, 70, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:50:20,289 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable209 [2021-05-06 11:50:20,289 INFO L428 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:50:20,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:50:20,289 INFO L82 PathProgramCache]: Analyzing trace with hash -1388930291, now seen corresponding path program 70 times [2021-05-06 11:50:20,290 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:50:20,290 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1657649586] [2021-05-06 11:50:20,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:50:20,296 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:50:20,311 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:50:20,312 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:50:20,333 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:50:20,336 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:50:20,349 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:50:20,370 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 11:50:20,373 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:50:20,373 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:50:20,390 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:50:20,411 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:50:20,427 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 11:50:20,429 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:50:20,431 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:50:20,445 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:50:20,446 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:50:20,543 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:50:20,547 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:50:20,559 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:50:20,575 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 11:50:20,576 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:50:20,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:50:20,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:50:20,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:50:20,637 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:50:20,639 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:50:26,981 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:50:26,981 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1657649586] [2021-05-06 11:50:26,981 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1657649586] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:50:26,981 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:50:26,981 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [74] imperfect sequences [] total 74 [2021-05-06 11:50:26,981 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437157089] [2021-05-06 11:50:26,982 INFO L460 AbstractCegarLoop]: Interpolant automaton has 74 states [2021-05-06 11:50:26,982 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:50:26,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-05-06 11:50:26,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=5332, Unknown=0, NotChecked=0, Total=5550 [2021-05-06 11:50:26,982 INFO L87 Difference]: Start difference. First operand 226 states and 228 transitions. Second operand has 74 states, 74 states have (on average 2.972972972972973) internal successors, (220), 73 states have internal predecessors, (220), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:50:35,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:50:35,694 INFO L93 Difference]: Finished difference Result 238 states and 242 transitions. [2021-05-06 11:50:35,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-05-06 11:50:35,695 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 2.972972972972973) internal successors, (220), 73 states have internal predecessors, (220), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 224 [2021-05-06 11:50:35,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:50:35,695 INFO L225 Difference]: With dead ends: 238 [2021-05-06 11:50:35,695 INFO L226 Difference]: Without dead ends: 230 [2021-05-06 11:50:35,696 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 10 SyntacticMatches, 142 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2697 ImplicationChecksByTransitivity, 9621.3ms TimeCoverageRelationStatistics Valid=573, Invalid=20597, Unknown=0, NotChecked=0, Total=21170 [2021-05-06 11:50:35,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2021-05-06 11:50:35,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 229. [2021-05-06 11:50:35,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 224 states have (on average 1.0133928571428572) internal successors, (227), 224 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 11:50:35,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 231 transitions. [2021-05-06 11:50:35,742 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 231 transitions. Word has length 224 [2021-05-06 11:50:35,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:50:35,742 INFO L480 AbstractCegarLoop]: Abstraction has 229 states and 231 transitions. [2021-05-06 11:50:35,742 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 74 states, 74 states have (on average 2.972972972972973) internal successors, (220), 73 states have internal predecessors, (220), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:50:35,742 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 231 transitions. [2021-05-06 11:50:35,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2021-05-06 11:50:35,743 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:50:35,743 INFO L523 BasicCegarLoop]: trace histogram [72, 72, 71, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:50:35,743 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable212 [2021-05-06 11:50:35,744 INFO L428 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:50:35,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:50:35,744 INFO L82 PathProgramCache]: Analyzing trace with hash 550491205, now seen corresponding path program 71 times [2021-05-06 11:50:35,744 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:50:35,744 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1143454636] [2021-05-06 11:50:35,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:50:35,751 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:50:35,752 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:50:35,753 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:50:35,785 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:50:35,799 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:50:35,825 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:50:35,847 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 11:50:35,851 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:50:35,851 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:50:35,875 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:50:35,899 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:50:35,922 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 11:50:35,923 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:50:35,926 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:50:35,942 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:50:35,943 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:50:36,051 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:50:36,055 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:50:36,066 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:50:36,082 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 11:50:36,083 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:50:36,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:50:36,132 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:50:36,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:50:36,135 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:50:36,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:50:42,390 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:50:42,390 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1143454636] [2021-05-06 11:50:42,390 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1143454636] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:50:42,390 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:50:42,391 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [75] imperfect sequences [] total 75 [2021-05-06 11:50:42,391 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600149817] [2021-05-06 11:50:42,391 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2021-05-06 11:50:42,391 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:50:42,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-05-06 11:50:42,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=5479, Unknown=0, NotChecked=0, Total=5700 [2021-05-06 11:50:42,391 INFO L87 Difference]: Start difference. First operand 229 states and 231 transitions. Second operand has 75 states, 75 states have (on average 2.973333333333333) internal successors, (223), 74 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 11:50:51,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:50:51,421 INFO L93 Difference]: Finished difference Result 241 states and 245 transitions. [2021-05-06 11:50:51,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-05-06 11:50:51,421 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 2.973333333333333) internal successors, (223), 74 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 11:50:51,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:50:51,422 INFO L225 Difference]: With dead ends: 241 [2021-05-06 11:50:51,422 INFO L226 Difference]: Without dead ends: 233 [2021-05-06 11:50:51,423 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 10 SyntacticMatches, 144 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2771 ImplicationChecksByTransitivity, 9665.1ms TimeCoverageRelationStatistics Valid=581, Invalid=21175, Unknown=0, NotChecked=0, Total=21756 [2021-05-06 11:50:51,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2021-05-06 11:50:51,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 232. [2021-05-06 11:50:51,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 227 states have (on average 1.013215859030837) internal successors, (230), 227 states have internal predecessors, (230), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:50:51,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 234 transitions. [2021-05-06 11:50:51,467 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 234 transitions. Word has length 227 [2021-05-06 11:50:51,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:50:51,467 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 234 transitions. [2021-05-06 11:50:51,467 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 75 states, 75 states have (on average 2.973333333333333) internal successors, (223), 74 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 11:50:51,467 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 234 transitions. [2021-05-06 11:50:51,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2021-05-06 11:50:51,468 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:50:51,468 INFO L523 BasicCegarLoop]: trace histogram [73, 73, 72, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:50:51,468 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable215 [2021-05-06 11:50:51,468 INFO L428 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:50:51,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:50:51,468 INFO L82 PathProgramCache]: Analyzing trace with hash 1956212749, now seen corresponding path program 72 times [2021-05-06 11:50:51,468 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:50:51,468 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1332967338] [2021-05-06 11:50:51,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:50:51,474 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:50:51,475 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:50:51,476 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:50:51,502 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:50:51,505 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:50:51,531 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:50:51,553 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 11:50:51,556 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:50:51,567 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:50:51,577 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:50:51,587 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:50:51,603 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 11:50:51,603 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:50:51,606 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:50:51,606 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:50:51,607 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:50:51,632 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:50:51,635 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:50:51,662 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:50:51,680 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 11:50:51,681 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:50:51,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:50:51,751 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:50:51,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:50:51,754 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:50:51,756 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:50:58,341 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:50:58,341 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1332967338] [2021-05-06 11:50:58,341 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1332967338] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:50:58,341 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:50:58,341 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [76] imperfect sequences [] total 76 [2021-05-06 11:50:58,341 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643974491] [2021-05-06 11:50:58,341 INFO L460 AbstractCegarLoop]: Interpolant automaton has 76 states [2021-05-06 11:50:58,342 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:50:58,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-05-06 11:50:58,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=5628, Unknown=0, NotChecked=0, Total=5852 [2021-05-06 11:50:58,342 INFO L87 Difference]: Start difference. First operand 232 states and 234 transitions. Second operand has 76 states, 76 states have (on average 2.973684210526316) internal successors, (226), 75 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 11:51:07,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:51:07,432 INFO L93 Difference]: Finished difference Result 244 states and 248 transitions. [2021-05-06 11:51:07,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-05-06 11:51:07,432 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 2.973684210526316) internal successors, (226), 75 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 11:51:07,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:51:07,433 INFO L225 Difference]: With dead ends: 244 [2021-05-06 11:51:07,433 INFO L226 Difference]: Without dead ends: 236 [2021-05-06 11:51:07,434 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 9 SyntacticMatches, 147 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2846 ImplicationChecksByTransitivity, 9999.8ms TimeCoverageRelationStatistics Valid=589, Invalid=21761, Unknown=0, NotChecked=0, Total=22350 [2021-05-06 11:51:07,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2021-05-06 11:51:07,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 235. [2021-05-06 11:51:07,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 230 states have (on average 1.0130434782608695) internal successors, (233), 230 states have internal predecessors, (233), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:51:07,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 237 transitions. [2021-05-06 11:51:07,486 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 237 transitions. Word has length 230 [2021-05-06 11:51:07,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:51:07,487 INFO L480 AbstractCegarLoop]: Abstraction has 235 states and 237 transitions. [2021-05-06 11:51:07,487 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 76 states, 76 states have (on average 2.973684210526316) internal successors, (226), 75 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 11:51:07,487 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 237 transitions. [2021-05-06 11:51:07,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 234 [2021-05-06 11:51:07,487 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:51:07,488 INFO L523 BasicCegarLoop]: trace histogram [74, 74, 73, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:51:07,488 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable218 [2021-05-06 11:51:07,488 INFO L428 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:51:07,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:51:07,488 INFO L82 PathProgramCache]: Analyzing trace with hash -419373243, now seen corresponding path program 73 times [2021-05-06 11:51:07,488 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:51:07,488 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1479872785] [2021-05-06 11:51:07,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:51:07,495 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:51:07,510 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:51:07,511 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:51:07,529 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:51:07,532 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:51:07,550 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:51:07,571 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 11:51:07,574 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:51:07,585 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:51:07,594 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:51:07,603 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:51:07,620 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 11:51:07,620 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:51:07,623 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:51:07,623 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:51:07,624 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:51:07,662 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:51:07,665 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:51:07,690 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:51:07,709 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 11:51:07,710 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:51:07,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:51:07,763 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:51:07,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:51:07,766 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:51:07,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:51:21,509 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:51:21,510 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1479872785] [2021-05-06 11:51:21,510 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1479872785] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:51:21,510 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:51:21,510 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [150] imperfect sequences [] total 150 [2021-05-06 11:51:21,510 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461575327] [2021-05-06 11:51:21,510 INFO L460 AbstractCegarLoop]: Interpolant automaton has 150 states [2021-05-06 11:51:21,510 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:51:21,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 150 interpolants. [2021-05-06 11:51:21,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=446, Invalid=22204, Unknown=0, NotChecked=0, Total=22650 [2021-05-06 11:51:21,511 INFO L87 Difference]: Start difference. First operand 235 states and 237 transitions. Second operand has 150 states, 150 states have (on average 1.5266666666666666) internal successors, (229), 149 states have internal predecessors, (229), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:51:45,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:51:45,082 INFO L93 Difference]: Finished difference Result 246 states and 250 transitions. [2021-05-06 11:51:45,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 150 states. [2021-05-06 11:51:45,083 INFO L78 Accepts]: Start accepts. Automaton has has 150 states, 150 states have (on average 1.5266666666666666) internal successors, (229), 149 states have internal predecessors, (229), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 233 [2021-05-06 11:51:45,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:51:45,084 INFO L225 Difference]: With dead ends: 246 [2021-05-06 11:51:45,084 INFO L226 Difference]: Without dead ends: 238 [2021-05-06 11:51:45,088 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 9 SyntacticMatches, 76 SemanticMatches, 296 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10952 ImplicationChecksByTransitivity, 26274.3ms TimeCoverageRelationStatistics Valid=1181, Invalid=87325, Unknown=0, NotChecked=0, Total=88506 [2021-05-06 11:51:45,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2021-05-06 11:51:45,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 238. [2021-05-06 11:51:45,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 238 states, 233 states have (on average 1.0128755364806867) internal successors, (236), 233 states have internal predecessors, (236), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:51:45,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 240 transitions. [2021-05-06 11:51:45,154 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 240 transitions. Word has length 233 [2021-05-06 11:51:45,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:51:45,154 INFO L480 AbstractCegarLoop]: Abstraction has 238 states and 240 transitions. [2021-05-06 11:51:45,154 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 150 states, 150 states have (on average 1.5266666666666666) internal successors, (229), 149 states have internal predecessors, (229), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:51:45,154 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 240 transitions. [2021-05-06 11:51:45,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2021-05-06 11:51:45,155 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:51:45,155 INFO L523 BasicCegarLoop]: trace histogram [75, 75, 74, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:51:45,155 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable221 [2021-05-06 11:51:45,155 INFO L428 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:51:45,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:51:45,156 INFO L82 PathProgramCache]: Analyzing trace with hash 969442573, now seen corresponding path program 74 times [2021-05-06 11:51:45,156 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:51:45,156 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [191243593] [2021-05-06 11:51:45,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:51:45,164 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:51:45,181 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:51:45,183 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:51:45,273 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:51:45,277 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:51:45,293 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:51:45,320 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 11:51:45,324 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:51:45,325 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:51:45,345 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:51:45,370 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:51:45,398 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 11:51:45,399 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:51:45,402 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:51:45,403 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:51:45,405 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:51:45,566 WARN L205 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:51:45,585 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:51:45,589 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:51:45,626 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:51:45,647 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 11:51:45,648 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:51:45,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:51:45,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:51:45,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:51:45,704 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:51:45,707 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:51:52,891 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:51:52,891 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [191243593] [2021-05-06 11:51:52,891 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [191243593] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:51:52,891 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:51:52,892 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [78] imperfect sequences [] total 78 [2021-05-06 11:51:52,892 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886019098] [2021-05-06 11:51:52,892 INFO L460 AbstractCegarLoop]: Interpolant automaton has 78 states [2021-05-06 11:51:52,892 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:51:52,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-05-06 11:51:52,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=5932, Unknown=0, NotChecked=0, Total=6162 [2021-05-06 11:51:52,893 INFO L87 Difference]: Start difference. First operand 238 states and 240 transitions. Second operand has 78 states, 78 states have (on average 2.9743589743589745) internal successors, (232), 77 states have internal predecessors, (232), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:52:02,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:52:02,541 INFO L93 Difference]: Finished difference Result 250 states and 254 transitions. [2021-05-06 11:52:02,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-05-06 11:52:02,542 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 78 states have (on average 2.9743589743589745) internal successors, (232), 77 states have internal predecessors, (232), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 236 [2021-05-06 11:52:02,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:52:02,543 INFO L225 Difference]: With dead ends: 250 [2021-05-06 11:52:02,543 INFO L226 Difference]: Without dead ends: 242 [2021-05-06 11:52:02,544 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 10 SyntacticMatches, 150 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2999 ImplicationChecksByTransitivity, 10756.6ms TimeCoverageRelationStatistics Valid=605, Invalid=22957, Unknown=0, NotChecked=0, Total=23562 [2021-05-06 11:52:02,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2021-05-06 11:52:02,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 241. [2021-05-06 11:52:02,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 236 states have (on average 1.0127118644067796) internal successors, (239), 236 states have internal predecessors, (239), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:52:02,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 243 transitions. [2021-05-06 11:52:02,595 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 243 transitions. Word has length 236 [2021-05-06 11:52:02,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:52:02,596 INFO L480 AbstractCegarLoop]: Abstraction has 241 states and 243 transitions. [2021-05-06 11:52:02,596 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 78 states, 78 states have (on average 2.9743589743589745) internal successors, (232), 77 states have internal predecessors, (232), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:52:02,596 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 243 transitions. [2021-05-06 11:52:02,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 240 [2021-05-06 11:52:02,596 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:52:02,597 INFO L523 BasicCegarLoop]: trace histogram [76, 76, 75, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:52:02,597 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable224 [2021-05-06 11:52:02,597 INFO L428 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:52:02,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:52:02,597 INFO L82 PathProgramCache]: Analyzing trace with hash 1761454661, now seen corresponding path program 75 times [2021-05-06 11:52:02,597 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:52:02,597 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [437117922] [2021-05-06 11:52:02,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:52:02,603 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:52:02,604 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:52:02,605 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:52:02,622 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:52:02,625 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:52:02,650 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:52:02,670 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 11:52:02,673 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:52:02,702 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:52:02,716 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:52:02,728 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:52:02,751 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 11:52:02,753 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:52:02,756 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:52:02,756 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:52:02,758 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:52:02,830 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:52:02,833 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:52:02,865 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:52:02,881 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 11:52:02,882 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:52:02,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:52:02,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:52:02,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:52:02,946 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:52:02,949 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:52:09,935 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:52:09,935 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [437117922] [2021-05-06 11:52:09,935 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [437117922] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:52:09,935 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:52:09,935 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [79] imperfect sequences [] total 79 [2021-05-06 11:52:09,935 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290942934] [2021-05-06 11:52:09,935 INFO L460 AbstractCegarLoop]: Interpolant automaton has 79 states [2021-05-06 11:52:09,936 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:52:09,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-05-06 11:52:09,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=6087, Unknown=0, NotChecked=0, Total=6320 [2021-05-06 11:52:09,936 INFO L87 Difference]: Start difference. First operand 241 states and 243 transitions. Second operand has 79 states, 79 states have (on average 2.9746835443037973) internal successors, (235), 78 states have internal predecessors, (235), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:52:19,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:52:19,771 INFO L93 Difference]: Finished difference Result 253 states and 257 transitions. [2021-05-06 11:52:19,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-05-06 11:52:19,771 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 2.9746835443037973) internal successors, (235), 78 states have internal predecessors, (235), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 239 [2021-05-06 11:52:19,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:52:19,772 INFO L225 Difference]: With dead ends: 253 [2021-05-06 11:52:19,772 INFO L226 Difference]: Without dead ends: 245 [2021-05-06 11:52:19,773 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 10 SyntacticMatches, 152 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3077 ImplicationChecksByTransitivity, 10646.3ms TimeCoverageRelationStatistics Valid=613, Invalid=23567, Unknown=0, NotChecked=0, Total=24180 [2021-05-06 11:52:19,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2021-05-06 11:52:19,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 244. [2021-05-06 11:52:19,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 239 states have (on average 1.0125523012552302) internal successors, (242), 239 states have internal predecessors, (242), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:52:19,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 246 transitions. [2021-05-06 11:52:19,821 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 246 transitions. Word has length 239 [2021-05-06 11:52:19,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:52:19,821 INFO L480 AbstractCegarLoop]: Abstraction has 244 states and 246 transitions. [2021-05-06 11:52:19,821 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 79 states, 79 states have (on average 2.9746835443037973) internal successors, (235), 78 states have internal predecessors, (235), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:52:19,821 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 246 transitions. [2021-05-06 11:52:19,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2021-05-06 11:52:19,822 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:52:19,822 INFO L523 BasicCegarLoop]: trace histogram [77, 77, 76, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:52:19,822 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable227 [2021-05-06 11:52:19,822 INFO L428 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:52:19,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:52:19,823 INFO L82 PathProgramCache]: Analyzing trace with hash 43244045, now seen corresponding path program 76 times [2021-05-06 11:52:19,823 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:52:19,823 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1040359405] [2021-05-06 11:52:19,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:52:19,839 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:52:19,854 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:52:19,855 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:52:20,210 WARN L205 SmtUtils]: Spent 354.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 1 [2021-05-06 11:52:20,222 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:52:20,224 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:52:20,236 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:52:20,261 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 11:52:20,264 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:52:20,265 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:52:20,277 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:52:20,296 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:52:20,313 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 11:52:20,314 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:52:20,316 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:52:20,317 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:52:20,318 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:52:20,352 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:52:20,357 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:52:20,383 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:52:20,400 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 11:52:20,401 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:52:20,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:52:20,471 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:52:20,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:52:20,474 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:52:20,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:52:27,706 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:52:27,707 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1040359405] [2021-05-06 11:52:27,707 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1040359405] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:52:27,707 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:52:27,707 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [80] imperfect sequences [] total 80 [2021-05-06 11:52:27,707 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231367441] [2021-05-06 11:52:27,707 INFO L460 AbstractCegarLoop]: Interpolant automaton has 80 states [2021-05-06 11:52:27,707 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:52:27,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-05-06 11:52:27,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=6244, Unknown=0, NotChecked=0, Total=6480 [2021-05-06 11:52:27,708 INFO L87 Difference]: Start difference. First operand 244 states and 246 transitions. Second operand has 80 states, 80 states have (on average 2.975) internal successors, (238), 79 states have internal predecessors, (238), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:52:37,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:52:37,792 INFO L93 Difference]: Finished difference Result 256 states and 260 transitions. [2021-05-06 11:52:37,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-05-06 11:52:37,793 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 2.975) internal successors, (238), 79 states have internal predecessors, (238), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 242 [2021-05-06 11:52:37,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:52:37,794 INFO L225 Difference]: With dead ends: 256 [2021-05-06 11:52:37,794 INFO L226 Difference]: Without dead ends: 248 [2021-05-06 11:52:37,795 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 9 SyntacticMatches, 155 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3156 ImplicationChecksByTransitivity, 10970.6ms TimeCoverageRelationStatistics Valid=621, Invalid=24185, Unknown=0, NotChecked=0, Total=24806 [2021-05-06 11:52:37,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2021-05-06 11:52:37,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 247. [2021-05-06 11:52:37,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 247 states, 242 states have (on average 1.012396694214876) internal successors, (245), 242 states have internal predecessors, (245), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:52:37,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 249 transitions. [2021-05-06 11:52:37,844 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 249 transitions. Word has length 242 [2021-05-06 11:52:37,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:52:37,844 INFO L480 AbstractCegarLoop]: Abstraction has 247 states and 249 transitions. [2021-05-06 11:52:37,844 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 80 states, 80 states have (on average 2.975) internal successors, (238), 79 states have internal predecessors, (238), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:52:37,844 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 249 transitions. [2021-05-06 11:52:37,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2021-05-06 11:52:37,845 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:52:37,845 INFO L523 BasicCegarLoop]: trace histogram [78, 78, 77, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:52:37,845 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable230 [2021-05-06 11:52:37,845 INFO L428 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:52:37,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:52:37,845 INFO L82 PathProgramCache]: Analyzing trace with hash 251016517, now seen corresponding path program 77 times [2021-05-06 11:52:37,845 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:52:37,845 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1531307684] [2021-05-06 11:52:37,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:52:37,852 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:52:37,866 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:52:37,868 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:52:37,888 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:52:37,891 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:52:37,902 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:52:37,923 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 11:52:37,927 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:52:37,938 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:52:37,951 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:52:37,961 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:52:37,978 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 11:52:37,979 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:52:37,981 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:52:37,997 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:52:37,998 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:52:38,023 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:52:38,026 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:52:38,041 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:52:38,058 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 11:52:38,059 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:52:38,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:52:38,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:52:38,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:52:38,127 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:52:38,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:52:45,376 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:52:45,376 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1531307684] [2021-05-06 11:52:45,376 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1531307684] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:52:45,377 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:52:45,377 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [81] imperfect sequences [] total 81 [2021-05-06 11:52:45,377 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675068531] [2021-05-06 11:52:45,377 INFO L460 AbstractCegarLoop]: Interpolant automaton has 81 states [2021-05-06 11:52:45,377 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:52:45,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2021-05-06 11:52:45,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=6403, Unknown=0, NotChecked=0, Total=6642 [2021-05-06 11:52:45,378 INFO L87 Difference]: Start difference. First operand 247 states and 249 transitions. Second operand has 81 states, 81 states have (on average 2.9753086419753085) internal successors, (241), 80 states have internal predecessors, (241), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:52:55,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:52:55,751 INFO L93 Difference]: Finished difference Result 259 states and 263 transitions. [2021-05-06 11:52:55,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-05-06 11:52:55,751 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 81 states have (on average 2.9753086419753085) internal successors, (241), 80 states have internal predecessors, (241), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 245 [2021-05-06 11:52:55,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:52:55,752 INFO L225 Difference]: With dead ends: 259 [2021-05-06 11:52:55,752 INFO L226 Difference]: Without dead ends: 251 [2021-05-06 11:52:55,753 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 324 GetRequests, 9 SyntacticMatches, 157 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3236 ImplicationChecksByTransitivity, 11106.3ms TimeCoverageRelationStatistics Valid=629, Invalid=24811, Unknown=0, NotChecked=0, Total=25440 [2021-05-06 11:52:55,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2021-05-06 11:52:55,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 250. [2021-05-06 11:52:55,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 250 states, 245 states have (on average 1.0122448979591836) internal successors, (248), 245 states have internal predecessors, (248), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:52:55,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 252 transitions. [2021-05-06 11:52:55,803 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 252 transitions. Word has length 245 [2021-05-06 11:52:55,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:52:55,803 INFO L480 AbstractCegarLoop]: Abstraction has 250 states and 252 transitions. [2021-05-06 11:52:55,803 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 81 states, 81 states have (on average 2.9753086419753085) internal successors, (241), 80 states have internal predecessors, (241), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:52:55,803 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 252 transitions. [2021-05-06 11:52:55,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 249 [2021-05-06 11:52:55,804 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:52:55,804 INFO L523 BasicCegarLoop]: trace histogram [79, 79, 78, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:52:55,804 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable233 [2021-05-06 11:52:55,804 INFO L428 AbstractCegarLoop]: === Iteration 81 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:52:55,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:52:55,804 INFO L82 PathProgramCache]: Analyzing trace with hash 952856333, now seen corresponding path program 78 times [2021-05-06 11:52:55,805 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:52:55,805 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1221666244] [2021-05-06 11:52:55,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:52:55,812 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:52:55,812 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:52:55,814 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:52:55,831 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:52:55,834 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:52:55,858 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:52:55,878 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 11:52:55,881 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:52:55,892 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:52:55,902 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:52:55,911 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:52:55,928 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 11:52:55,929 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:52:55,931 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:52:55,932 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:52:55,933 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:52:55,953 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:52:55,956 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:52:55,982 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:52:55,999 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 11:52:56,000 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:52:56,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:52:56,041 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:52:56,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:52:56,044 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 11:52:56,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:53:03,637 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:53:03,637 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1221666244] [2021-05-06 11:53:03,637 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1221666244] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:53:03,637 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:53:03,637 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [82] imperfect sequences [] total 82 [2021-05-06 11:53:03,637 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291651397] [2021-05-06 11:53:03,637 INFO L460 AbstractCegarLoop]: Interpolant automaton has 82 states [2021-05-06 11:53:03,637 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:53:03,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-05-06 11:53:03,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=6564, Unknown=0, NotChecked=0, Total=6806 [2021-05-06 11:53:03,638 INFO L87 Difference]: Start difference. First operand 250 states and 252 transitions. Second operand has 82 states, 82 states have (on average 2.975609756097561) internal successors, (244), 81 states have internal predecessors, (244), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:53:14,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:53:14,193 INFO L93 Difference]: Finished difference Result 262 states and 266 transitions. [2021-05-06 11:53:14,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-05-06 11:53:14,193 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 2.975609756097561) internal successors, (244), 81 states have internal predecessors, (244), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 248 [2021-05-06 11:53:14,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:53:14,194 INFO L225 Difference]: With dead ends: 262 [2021-05-06 11:53:14,194 INFO L226 Difference]: Without dead ends: 254 [2021-05-06 11:53:14,195 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 10 SyntacticMatches, 158 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3317 ImplicationChecksByTransitivity, 11520.3ms TimeCoverageRelationStatistics Valid=637, Invalid=25445, Unknown=0, NotChecked=0, Total=26082 [2021-05-06 11:53:14,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2021-05-06 11:53:14,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 253. [2021-05-06 11:53:14,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 248 states have (on average 1.0120967741935485) internal successors, (251), 248 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 11:53:14,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 255 transitions. [2021-05-06 11:53:14,246 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 255 transitions. Word has length 248 [2021-05-06 11:53:14,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:53:14,247 INFO L480 AbstractCegarLoop]: Abstraction has 253 states and 255 transitions. [2021-05-06 11:53:14,247 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 82 states, 82 states have (on average 2.975609756097561) internal successors, (244), 81 states have internal predecessors, (244), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:53:14,247 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 255 transitions. [2021-05-06 11:53:14,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 252 [2021-05-06 11:53:14,248 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:53:14,248 INFO L523 BasicCegarLoop]: trace histogram [80, 80, 79, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:53:14,248 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable236 [2021-05-06 11:53:14,248 INFO L428 AbstractCegarLoop]: === Iteration 82 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:53:14,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:53:14,248 INFO L82 PathProgramCache]: Analyzing trace with hash 1562017861, now seen corresponding path program 79 times [2021-05-06 11:53:14,248 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:53:14,248 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1233204759] [2021-05-06 11:53:14,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:53:14,255 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:53:14,270 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:14,271 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:14,456 WARN L205 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 1 [2021-05-06 11:53:14,468 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:53:14,470 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:53:14,482 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:53:14,502 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 11:53:14,505 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:53:14,515 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:14,525 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:53:14,534 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:53:14,551 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 11:53:14,552 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:53:14,554 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:53:14,571 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:14,573 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:14,603 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:53:14,606 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:53:14,618 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:53:14,634 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 11:53:14,635 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:53:14,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:14,681 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:53:14,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:14,683 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:53:14,685 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:53:22,428 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:53:22,428 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1233204759] [2021-05-06 11:53:22,428 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1233204759] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:53:22,428 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:53:22,428 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [83] imperfect sequences [] total 83 [2021-05-06 11:53:22,429 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123370376] [2021-05-06 11:53:22,429 INFO L460 AbstractCegarLoop]: Interpolant automaton has 83 states [2021-05-06 11:53:22,429 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:53:22,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-05-06 11:53:22,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=6727, Unknown=0, NotChecked=0, Total=6972 [2021-05-06 11:53:22,429 INFO L87 Difference]: Start difference. First operand 253 states and 255 transitions. Second operand has 83 states, 83 states have (on average 2.9759036144578315) internal successors, (247), 82 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 11:53:33,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:53:33,212 INFO L93 Difference]: Finished difference Result 265 states and 269 transitions. [2021-05-06 11:53:33,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-05-06 11:53:33,213 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 2.9759036144578315) internal successors, (247), 82 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 11:53:33,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:53:33,213 INFO L225 Difference]: With dead ends: 265 [2021-05-06 11:53:33,213 INFO L226 Difference]: Without dead ends: 257 [2021-05-06 11:53:33,214 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 9 SyntacticMatches, 161 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3399 ImplicationChecksByTransitivity, 11739.1ms TimeCoverageRelationStatistics Valid=645, Invalid=26087, Unknown=0, NotChecked=0, Total=26732 [2021-05-06 11:53:33,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2021-05-06 11:53:33,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 256. [2021-05-06 11:53:33,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 251 states have (on average 1.0119521912350598) internal successors, (254), 251 states have internal predecessors, (254), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:53:33,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 258 transitions. [2021-05-06 11:53:33,266 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 258 transitions. Word has length 251 [2021-05-06 11:53:33,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:53:33,267 INFO L480 AbstractCegarLoop]: Abstraction has 256 states and 258 transitions. [2021-05-06 11:53:33,267 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 83 states, 83 states have (on average 2.9759036144578315) internal successors, (247), 82 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 11:53:33,267 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 258 transitions. [2021-05-06 11:53:33,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2021-05-06 11:53:33,267 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:53:33,268 INFO L523 BasicCegarLoop]: trace histogram [81, 81, 80, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:53:33,268 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable239 [2021-05-06 11:53:33,268 INFO L428 AbstractCegarLoop]: === Iteration 83 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:53:33,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:53:33,268 INFO L82 PathProgramCache]: Analyzing trace with hash -1438694387, now seen corresponding path program 80 times [2021-05-06 11:53:33,268 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:53:33,268 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1368320060] [2021-05-06 11:53:33,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:53:33,278 WARN L240 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size [2021-05-06 11:53:33,279 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:33,280 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:33,301 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 35 [2021-05-06 11:53:33,304 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 25 [2021-05-06 11:53:33,334 WARN L245 tifierPushTermWalker]: treesize reduction 6, result has 92.9 percent of original size 78 [2021-05-06 11:53:33,491 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-05-06 11:53:33,491 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 11:53:33,495 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size [2021-05-06 11:53:33,507 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:33,517 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:53:33,525 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 95.2 percent of original size 59 [2021-05-06 11:53:33,542 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 11:53:33,542 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:53:33,545 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size [2021-05-06 11:53:33,545 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:33,546 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:53:33,565 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:53:33,571 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:53:33,597 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 95.4 percent of original size 83 [2021-05-06 11:53:33,614 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 11:53:33,615 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:53:33,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:33,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:53:33,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:53:33,669 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:53:33,671 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:53:41,589 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:53:41,589 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1368320060] [2021-05-06 11:53:41,589 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1368320060] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:53:41,589 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:53:41,590 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [84] imperfect sequences [] total 84 [2021-05-06 11:53:41,590 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012010897] [2021-05-06 11:53:41,590 INFO L460 AbstractCegarLoop]: Interpolant automaton has 84 states [2021-05-06 11:53:41,590 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:53:41,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-05-06 11:53:41,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=6892, Unknown=0, NotChecked=0, Total=7140 [2021-05-06 11:53:41,591 INFO L87 Difference]: Start difference. First operand 256 states and 258 transitions. Second operand has 84 states, 84 states have (on average 2.9761904761904763) internal successors, (250), 83 states have internal predecessors, (250), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)