/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_6.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 11:55:42,852 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 11:55:42,854 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 11:55:42,878 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 11:55:42,917 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 11:55:42,917 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 11:55:42,918 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 11:55:42,924 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 11:55:42,938 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 11:55:42,938 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 11:55:42,941 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 11:55:42,941 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 11:55:42,941 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 11:55:42,941 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 11:55:42,942 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 11:55:42,942 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 11:55:42,942 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 11:55:42,942 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 11:55:42,943 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 11:55:42,943 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 11:55:42,943 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 11:55:42,943 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 11:55:42,943 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 11:55:42,943 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 11:55:42,943 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 11:55:42,943 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 11:55:42,944 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:55:42,944 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 11:55:42,944 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 11:55:42,944 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 11:55:42,944 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 11:55:42,944 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 11:55:43,157 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 11:55:43,172 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 11:55:43,174 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 11:55:43,175 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 11:55:43,175 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 11:55:43,176 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_6.c [2021-05-06 11:55:43,217 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/858b46e71/fe089c8390c7458d89afb7d995aec8d8/FLAG3215a7cc1 [2021-05-06 11:55:43,568 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 11:55:43,569 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_6.c [2021-05-06 11:55:43,573 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/858b46e71/fe089c8390c7458d89afb7d995aec8d8/FLAG3215a7cc1 [2021-05-06 11:55:43,584 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/858b46e71/fe089c8390c7458d89afb7d995aec8d8 [2021-05-06 11:55:43,588 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 11:55:43,589 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 11:55:43,591 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 11:55:43,591 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 11:55:43,594 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 11:55:43,594 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:55:43" (1/1) ... [2021-05-06 11:55:43,595 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6be941bb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:43, skipping insertion in model container [2021-05-06 11:55:43,595 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:55:43" (1/1) ... [2021-05-06 11:55:43,599 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 11:55:43,606 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 11:55:43,681 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_6.c[318,331] [2021-05-06 11:55:43,688 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:55:43,692 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 11:55:43,699 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_6.c[318,331] [2021-05-06 11:55:43,701 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:55:43,708 INFO L208 MainTranslator]: Completed translation [2021-05-06 11:55:43,709 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:43 WrapperNode [2021-05-06 11:55:43,709 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 11:55:43,710 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 11:55:43,710 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 11:55:43,710 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 11:55:43,730 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:43" (1/1) ... [2021-05-06 11:55:43,731 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:43" (1/1) ... [2021-05-06 11:55:43,742 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:43" (1/1) ... [2021-05-06 11:55:43,742 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:43" (1/1) ... [2021-05-06 11:55:43,746 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:43" (1/1) ... [2021-05-06 11:55:43,748 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:43" (1/1) ... [2021-05-06 11:55:43,749 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:43" (1/1) ... [2021-05-06 11:55:43,750 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 11:55:43,750 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 11:55:43,750 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 11:55:43,750 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 11:55:43,751 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:43" (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 11:55:43,803 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 11:55:43,804 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 11:55:43,804 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 11:55:43,804 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 11:55:43,804 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 11:55:43,804 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 11:55:43,804 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 11:55:43,805 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 11:55:43,805 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 11:55:43,805 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 11:55:43,805 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 11:55:43,805 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 11:55:43,806 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 11:55:43,806 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 11:55:43,806 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 11:55:43,806 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 11:55:43,806 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 11:55:43,972 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 11:55:43,972 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 11:55:43,973 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:55:43 BoogieIcfgContainer [2021-05-06 11:55:43,973 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 11:55:43,974 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 11:55:43,974 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 11:55:43,976 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 11:55:43,976 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 11:55:43" (1/3) ... [2021-05-06 11:55:43,977 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5fbf1e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:55:43, skipping insertion in model container [2021-05-06 11:55:43,977 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:43" (2/3) ... [2021-05-06 11:55:43,977 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5fbf1e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:55:43, skipping insertion in model container [2021-05-06 11:55:43,977 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:55:43" (3/3) ... [2021-05-06 11:55:43,978 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_6.c [2021-05-06 11:55:43,982 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 11:55:43,984 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 11:55:43,996 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 11:55:44,017 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 11:55:44,017 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 11:55:44,017 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 11:55:44,017 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 11:55:44,017 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 11:55:44,017 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 11:55:44,018 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 11:55:44,018 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 11:55:44,027 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:55:44,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 11:55:44,031 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:44,031 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:44,032 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:44,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:44,035 INFO L82 PathProgramCache]: Analyzing trace with hash -1440262230, now seen corresponding path program 1 times [2021-05-06 11:55:44,040 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:44,040 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1922797258] [2021-05-06 11:55:44,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:44,102 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:55:44,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:44,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:44,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:44,275 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:44,276 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:44,276 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1922797258] [2021-05-06 11:55:44,277 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1922797258] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:44,278 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:44,278 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 11:55:44,278 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871795468] [2021-05-06 11:55:44,281 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 11:55:44,281 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:44,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 11:55:44,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 11:55:44,290 INFO L87 Difference]: Start difference. First operand has 22 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 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 11:55:44,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:44,400 INFO L93 Difference]: Finished difference Result 40 states and 52 transitions. [2021-05-06 11:55:44,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 11:55:44,402 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 11:55:44,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:44,407 INFO L225 Difference]: With dead ends: 40 [2021-05-06 11:55:44,407 INFO L226 Difference]: Without dead ends: 17 [2021-05-06 11:55:44,409 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 70.0ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:55:44,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-06 11:55:44,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-06 11:55:44,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:44,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-05-06 11:55:44,444 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 11 [2021-05-06 11:55:44,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:44,445 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-05-06 11:55:44,445 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 11:55:44,446 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-05-06 11:55:44,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-06 11:55:44,446 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:44,447 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:44,447 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 11:55:44,447 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:44,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:44,448 INFO L82 PathProgramCache]: Analyzing trace with hash -273622713, now seen corresponding path program 1 times [2021-05-06 11:55:44,449 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:44,449 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [32962010] [2021-05-06 11:55:44,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:44,505 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:44,521 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:44,537 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:44,546 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:44,560 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:44,562 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:55:44,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:44,647 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:44,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:44,663 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:44,714 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:44,714 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [32962010] [2021-05-06 11:55:44,715 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [32962010] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:44,715 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:44,715 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 11:55:44,715 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272609370] [2021-05-06 11:55:44,716 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 11:55:44,716 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:44,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 11:55:44,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:55:44,717 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:44,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:44,813 INFO L93 Difference]: Finished difference Result 29 states and 36 transitions. [2021-05-06 11:55:44,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 11:55:44,814 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-05-06 11:55:44,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:44,815 INFO L225 Difference]: With dead ends: 29 [2021-05-06 11:55:44,815 INFO L226 Difference]: Without dead ends: 20 [2021-05-06 11:55:44,816 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 104.7ms TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:55:44,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-06 11:55:44,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-05-06 11:55:44,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:44,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2021-05-06 11:55:44,825 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 13 [2021-05-06 11:55:44,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:44,826 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2021-05-06 11:55:44,826 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:44,826 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2021-05-06 11:55:44,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 11:55:44,826 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:44,827 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:44,827 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 11:55:44,827 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:44,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:44,827 INFO L82 PathProgramCache]: Analyzing trace with hash -88759266, now seen corresponding path program 1 times [2021-05-06 11:55:44,828 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:44,828 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [63873897] [2021-05-06 11:55:44,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:44,844 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:44,848 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:44,854 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:44,869 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:44,878 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:44,883 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:55:44,893 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:44,909 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:44,915 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:44,922 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:44,944 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:44,959 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:44,979 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:44,988 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:45,000 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:45,007 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:45,029 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:45,043 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:45,052 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:45,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:45,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:45,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:45,130 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:45,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:45,202 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:45,202 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [63873897] [2021-05-06 11:55:45,202 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [63873897] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:45,202 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:45,202 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 11:55:45,202 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448876951] [2021-05-06 11:55:45,203 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 11:55:45,203 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:45,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 11:55:45,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=59, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:55:45,204 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 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 11:55:45,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:45,348 INFO L93 Difference]: Finished difference Result 33 states and 41 transitions. [2021-05-06 11:55:45,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 11:55:45,348 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 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 11:55:45,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:45,349 INFO L225 Difference]: With dead ends: 33 [2021-05-06 11:55:45,349 INFO L226 Difference]: Without dead ends: 24 [2021-05-06 11:55:45,350 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 133.8ms TimeCoverageRelationStatistics Valid=60, Invalid=122, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:55:45,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-06 11:55:45,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-06 11:55:45,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 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 11:55:45,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-05-06 11:55:45,357 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 17 [2021-05-06 11:55:45,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:45,357 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-05-06 11:55:45,357 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 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 11:55:45,357 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-05-06 11:55:45,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-06 11:55:45,359 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:45,359 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:45,359 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 11:55:45,359 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:45,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:45,359 INFO L82 PathProgramCache]: Analyzing trace with hash 236661621, now seen corresponding path program 2 times [2021-05-06 11:55:45,359 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:45,359 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1193344883] [2021-05-06 11:55:45,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:45,376 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:55:45,396 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:45,400 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:45,412 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:45,414 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:45,426 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:55:45,443 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:45,454 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:45,464 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:45,469 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:45,474 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:45,481 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:45,482 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:45,486 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:45,497 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:45,505 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:45,519 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:45,527 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:45,541 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:45,542 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:45,544 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:45,553 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:45,555 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:45,603 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:45,621 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:45,623 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:45,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:45,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:45,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:45,673 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:45,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:45,754 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:45,755 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1193344883] [2021-05-06 11:55:45,755 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1193344883] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:45,755 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:45,755 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 11:55:45,755 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082540263] [2021-05-06 11:55:45,755 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 11:55:45,755 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:45,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 11:55:45,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:55:45,756 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:45,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:45,931 INFO L93 Difference]: Finished difference Result 37 states and 45 transitions. [2021-05-06 11:55:45,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:55:45,931 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-05-06 11:55:45,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:45,932 INFO L225 Difference]: With dead ends: 37 [2021-05-06 11:55:45,932 INFO L226 Difference]: Without dead ends: 28 [2021-05-06 11:55:45,932 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 177.6ms TimeCoverageRelationStatistics Valid=68, Invalid=172, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:55:45,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-06 11:55:45,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-05-06 11:55:45,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.173913043478261) internal successors, (27), 23 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:45,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2021-05-06 11:55:45,936 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 21 [2021-05-06 11:55:45,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:45,936 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2021-05-06 11:55:45,936 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:45,936 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2021-05-06 11:55:45,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-06 11:55:45,937 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:45,937 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:45,937 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-06 11:55:45,937 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:45,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:45,947 INFO L82 PathProgramCache]: Analyzing trace with hash 1513041740, now seen corresponding path program 3 times [2021-05-06 11:55:45,947 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:45,947 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1698729590] [2021-05-06 11:55:45,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:45,957 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:55:45,971 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:45,974 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:45,982 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:45,984 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:45,993 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:55:46,007 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:46,020 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:46,021 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:46,026 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:46,038 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:46,048 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:46,051 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:46,056 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:46,063 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:46,078 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:46,083 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:46,090 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:46,103 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:46,105 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:46,107 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:46,115 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:46,117 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:46,140 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:46,153 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:46,156 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:46,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:46,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:46,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:46,225 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:46,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:46,309 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:46,309 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1698729590] [2021-05-06 11:55:46,309 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1698729590] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:46,309 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:46,309 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:55:46,310 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [397862749] [2021-05-06 11:55:46,310 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:55:46,310 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:46,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:55:46,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:55:46,312 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:46,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:46,548 INFO L93 Difference]: Finished difference Result 41 states and 49 transitions. [2021-05-06 11:55:46,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:55:46,548 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-05-06 11:55:46,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:46,549 INFO L225 Difference]: With dead ends: 41 [2021-05-06 11:55:46,549 INFO L226 Difference]: Without dead ends: 32 [2021-05-06 11:55:46,549 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 208.2ms TimeCoverageRelationStatistics Valid=76, Invalid=230, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:55:46,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-06 11:55:46,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-06 11:55:46,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 27 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:46,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2021-05-06 11:55:46,553 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 25 [2021-05-06 11:55:46,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:46,553 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2021-05-06 11:55:46,553 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:46,553 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2021-05-06 11:55:46,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-06 11:55:46,554 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:46,554 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:46,554 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-06 11:55:46,554 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:46,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:46,554 INFO L82 PathProgramCache]: Analyzing trace with hash -1302368349, now seen corresponding path program 4 times [2021-05-06 11:55:46,554 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:46,554 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [418322471] [2021-05-06 11:55:46,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:46,568 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:55:46,587 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:46,591 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:46,601 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:46,603 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:46,617 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:55:46,631 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:46,638 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:46,639 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:46,643 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:46,660 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:46,667 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:46,669 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:46,671 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:46,672 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:46,679 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:46,689 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:46,697 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:46,703 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:46,704 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:46,706 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:46,716 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:46,718 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:46,744 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:46,759 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:46,760 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:46,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:46,793 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:46,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:46,799 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:46,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:46,885 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:46,885 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [418322471] [2021-05-06 11:55:46,886 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [418322471] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:46,886 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:46,886 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:55:46,886 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [534205682] [2021-05-06 11:55:46,886 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:55:46,886 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:46,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:55:46,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:55:46,887 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 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 11:55:47,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:47,167 INFO L93 Difference]: Finished difference Result 45 states and 53 transitions. [2021-05-06 11:55:47,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 11:55:47,167 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 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 11:55:47,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:47,168 INFO L225 Difference]: With dead ends: 45 [2021-05-06 11:55:47,168 INFO L226 Difference]: Without dead ends: 36 [2021-05-06 11:55:47,168 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 249.9ms TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:55:47,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-06 11:55:47,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-06 11:55:47,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.1290322580645162) internal successors, (35), 31 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 11:55:47,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2021-05-06 11:55:47,172 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 29 [2021-05-06 11:55:47,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:47,173 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2021-05-06 11:55:47,173 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 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 11:55:47,173 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2021-05-06 11:55:47,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-06 11:55:47,173 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:47,173 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:47,173 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-05-06 11:55:47,173 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:47,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:47,174 INFO L82 PathProgramCache]: Analyzing trace with hash -46551942, now seen corresponding path program 5 times [2021-05-06 11:55:47,174 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:47,174 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1373737108] [2021-05-06 11:55:47,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:47,181 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:55:47,182 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,184 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,192 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:47,194 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:47,213 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:55:47,227 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:47,230 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:47,231 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,235 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:47,246 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:47,253 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:47,254 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:47,258 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:47,258 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,263 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:47,272 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:47,279 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:47,284 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:47,299 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,301 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,309 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:47,310 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:47,319 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:47,332 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:47,333 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:47,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:47,369 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:47,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:47,373 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:47,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:47,462 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:47,462 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1373737108] [2021-05-06 11:55:47,462 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1373737108] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:47,462 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:47,462 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:55:47,462 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1639356352] [2021-05-06 11:55:47,462 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:55:47,462 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:47,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:55:47,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:55:47,463 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 10 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:47,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:47,782 INFO L93 Difference]: Finished difference Result 49 states and 57 transitions. [2021-05-06 11:55:47,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:55:47,783 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 10 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-05-06 11:55:47,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:47,783 INFO L225 Difference]: With dead ends: 49 [2021-05-06 11:55:47,783 INFO L226 Difference]: Without dead ends: 40 [2021-05-06 11:55:47,784 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 266.4ms TimeCoverageRelationStatistics Valid=92, Invalid=370, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:55:47,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-06 11:55:47,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-05-06 11:55:47,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.1142857142857143) internal successors, (39), 35 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:47,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2021-05-06 11:55:47,788 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 33 [2021-05-06 11:55:47,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:47,788 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2021-05-06 11:55:47,788 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 10 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:47,788 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2021-05-06 11:55:47,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 11:55:47,789 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:47,789 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:47,789 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-05-06 11:55:47,789 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:47,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:47,789 INFO L82 PathProgramCache]: Analyzing trace with hash -1536449071, now seen corresponding path program 6 times [2021-05-06 11:55:47,789 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:47,789 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [37907969] [2021-05-06 11:55:47,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:47,796 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:55:47,797 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,798 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,807 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:47,809 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:47,827 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:55:47,840 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:47,846 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:47,853 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,856 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:47,860 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:47,867 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:47,868 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:47,875 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:47,882 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,885 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:47,890 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:47,896 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:47,901 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:47,915 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,917 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,926 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:47,927 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:47,935 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:47,949 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 11:55:47,950 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:47,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:47,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:47,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:47,986 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:47,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:48,094 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:48,094 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [37907969] [2021-05-06 11:55:48,094 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [37907969] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:48,094 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:48,094 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 11:55:48,094 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802964996] [2021-05-06 11:55:48,095 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 11:55:48,095 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:48,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 11:55:48,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:55:48,095 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 12 states, 12 states have (on average 2.75) internal successors, (33), 11 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:48,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:48,487 INFO L93 Difference]: Finished difference Result 53 states and 61 transitions. [2021-05-06 11:55:48,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 11:55:48,487 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.75) internal successors, (33), 11 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-05-06 11:55:48,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:48,488 INFO L225 Difference]: With dead ends: 53 [2021-05-06 11:55:48,488 INFO L226 Difference]: Without dead ends: 44 [2021-05-06 11:55:48,488 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 299.8ms TimeCoverageRelationStatistics Valid=100, Invalid=452, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:55:48,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-06 11:55:48,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-05-06 11:55:48,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 39 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:48,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2021-05-06 11:55:48,493 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 37 [2021-05-06 11:55:48,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:48,493 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2021-05-06 11:55:48,493 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.75) internal successors, (33), 11 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:48,493 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2021-05-06 11:55:48,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-06 11:55:48,494 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:48,494 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:48,494 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-05-06 11:55:48,494 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:48,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:48,494 INFO L82 PathProgramCache]: Analyzing trace with hash 79895464, now seen corresponding path program 7 times [2021-05-06 11:55:48,495 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:48,495 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1087294722] [2021-05-06 11:55:48,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:48,501 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:55:48,502 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:48,503 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:48,511 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:48,513 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:48,530 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:55:48,542 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 11:55:48,546 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:48,546 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:48,552 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:48,560 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:48,567 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:48,567 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:48,570 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:48,575 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:48,579 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:48,582 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:48,589 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:48,592 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:48,605 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:48,606 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:48,615 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:48,617 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:48,624 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:48,637 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 11:55:48,638 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:48,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:48,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:48,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:48,673 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:48,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:48,807 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:48,808 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1087294722] [2021-05-06 11:55:48,808 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1087294722] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:48,808 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:48,808 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:55:48,808 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886752358] [2021-05-06 11:55:48,808 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:55:48,808 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:48,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:55:48,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:55:48,809 INFO L87 Difference]: Start difference. First operand 44 states and 47 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 11:55:49,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:49,231 INFO L93 Difference]: Finished difference Result 57 states and 65 transitions. [2021-05-06 11:55:49,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:55:49,235 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 11:55:49,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:49,235 INFO L225 Difference]: With dead ends: 57 [2021-05-06 11:55:49,235 INFO L226 Difference]: Without dead ends: 48 [2021-05-06 11:55:49,236 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 331.6ms TimeCoverageRelationStatistics Valid=108, Invalid=542, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:55:49,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-06 11:55:49,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-05-06 11:55:49,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 43 states have (on average 1.0930232558139534) internal successors, (47), 43 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 11:55:49,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2021-05-06 11:55:49,240 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 41 [2021-05-06 11:55:49,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:49,241 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2021-05-06 11:55:49,241 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 11:55:49,241 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2021-05-06 11:55:49,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-06 11:55:49,241 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:49,241 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:49,241 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-05-06 11:55:49,241 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:49,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:49,242 INFO L82 PathProgramCache]: Analyzing trace with hash -567423489, now seen corresponding path program 8 times [2021-05-06 11:55:49,242 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:49,242 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1852608744] [2021-05-06 11:55:49,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:49,255 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:55:49,267 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:49,269 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:49,276 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:49,278 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:49,286 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:55:49,300 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:49,304 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:49,305 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:49,308 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:49,317 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:49,324 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:49,325 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:49,327 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:49,333 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:49,336 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:49,341 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:49,348 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:49,352 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:49,352 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:49,358 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:49,368 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:49,370 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:49,388 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:49,401 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:49,402 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:49,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:49,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:49,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:49,438 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:49,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:49,581 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:49,581 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1852608744] [2021-05-06 11:55:49,581 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1852608744] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:49,581 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:49,581 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:55:49,581 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735371550] [2021-05-06 11:55:49,582 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:55:49,582 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:49,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:55:49,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:55:49,582 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand has 14 states, 14 states have (on average 2.9285714285714284) internal successors, (41), 13 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:50,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:50,071 INFO L93 Difference]: Finished difference Result 61 states and 69 transitions. [2021-05-06 11:55:50,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 11:55:50,072 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.9285714285714284) internal successors, (41), 13 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2021-05-06 11:55:50,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:50,072 INFO L225 Difference]: With dead ends: 61 [2021-05-06 11:55:50,072 INFO L226 Difference]: Without dead ends: 52 [2021-05-06 11:55:50,073 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 403.8ms TimeCoverageRelationStatistics Valid=116, Invalid=640, Unknown=0, NotChecked=0, Total=756 [2021-05-06 11:55:50,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-06 11:55:50,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-05-06 11:55:50,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.0851063829787233) internal successors, (51), 47 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:50,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions. [2021-05-06 11:55:50,078 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 45 [2021-05-06 11:55:50,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:50,078 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 55 transitions. [2021-05-06 11:55:50,078 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.9285714285714284) internal successors, (41), 13 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:50,078 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions. [2021-05-06 11:55:50,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 11:55:50,078 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:50,078 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:50,078 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-05-06 11:55:50,079 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:50,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:50,079 INFO L82 PathProgramCache]: Analyzing trace with hash -1011254058, now seen corresponding path program 9 times [2021-05-06 11:55:50,079 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:50,079 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [445028376] [2021-05-06 11:55:50,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:50,091 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:55:50,103 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:50,107 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:50,114 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:50,116 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:50,123 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:55:50,137 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:50,156 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:50,162 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:50,165 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:50,169 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:50,175 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:50,176 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:50,178 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:50,183 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:50,186 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:50,190 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:50,196 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:50,200 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:50,219 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:50,224 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:50,232 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:50,234 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:50,243 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:50,257 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:50,258 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:50,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:50,287 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:50,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:50,290 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:50,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:50,436 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:50,436 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [445028376] [2021-05-06 11:55:50,437 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [445028376] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:50,437 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:50,437 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:55:50,437 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063019667] [2021-05-06 11:55:50,437 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:55:50,437 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:50,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:55:50,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:55:50,438 INFO L87 Difference]: Start difference. First operand 52 states and 55 transitions. Second operand has 15 states, 15 states have (on average 3.0) internal successors, (45), 14 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:50,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:50,948 INFO L93 Difference]: Finished difference Result 65 states and 73 transitions. [2021-05-06 11:55:50,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:55:50,948 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.0) internal successors, (45), 14 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-05-06 11:55:50,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:50,949 INFO L225 Difference]: With dead ends: 65 [2021-05-06 11:55:50,949 INFO L226 Difference]: Without dead ends: 56 [2021-05-06 11:55:50,949 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 395.8ms TimeCoverageRelationStatistics Valid=124, Invalid=746, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:55:50,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-06 11:55:50,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-05-06 11:55:50,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 51 states have internal predecessors, (55), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:50,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 59 transitions. [2021-05-06 11:55:50,954 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 59 transitions. Word has length 49 [2021-05-06 11:55:50,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:50,954 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 59 transitions. [2021-05-06 11:55:50,954 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 3.0) internal successors, (45), 14 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:50,954 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 59 transitions. [2021-05-06 11:55:50,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-06 11:55:50,955 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:50,955 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:50,955 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-05-06 11:55:50,955 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:50,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:50,955 INFO L82 PathProgramCache]: Analyzing trace with hash -1953241043, now seen corresponding path program 10 times [2021-05-06 11:55:50,955 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:50,955 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [116433995] [2021-05-06 11:55:50,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:50,967 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:55:50,968 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:50,969 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:50,978 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:50,980 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:51,001 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:55:51,014 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:51,017 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:51,023 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:51,027 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:51,031 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:51,037 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:51,038 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:51,040 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:51,041 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:51,045 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:51,056 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:51,064 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:51,067 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:51,082 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:51,083 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:51,092 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:51,094 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:51,112 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:51,130 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:51,131 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:51,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:51,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:51,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:51,175 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:51,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:51,351 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:51,351 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [116433995] [2021-05-06 11:55:51,351 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [116433995] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:51,351 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:51,352 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:55:51,352 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462476956] [2021-05-06 11:55:51,352 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:55:51,352 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:51,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:55:51,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:55:51,353 INFO L87 Difference]: Start difference. First operand 56 states and 59 transitions. Second operand has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 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 11:55:51,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:51,888 INFO L93 Difference]: Finished difference Result 69 states and 77 transitions. [2021-05-06 11:55:51,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 11:55:51,889 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 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 11:55:51,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:51,889 INFO L225 Difference]: With dead ends: 69 [2021-05-06 11:55:51,889 INFO L226 Difference]: Without dead ends: 60 [2021-05-06 11:55:51,890 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 180 ImplicationChecksByTransitivity, 439.5ms TimeCoverageRelationStatistics Valid=132, Invalid=860, Unknown=0, NotChecked=0, Total=992 [2021-05-06 11:55:51,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-06 11:55:51,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-05-06 11:55:51,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 55 states have (on average 1.0727272727272728) internal successors, (59), 55 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 11:55:51,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 63 transitions. [2021-05-06 11:55:51,894 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 63 transitions. Word has length 53 [2021-05-06 11:55:51,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:51,895 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 63 transitions. [2021-05-06 11:55:51,895 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 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 11:55:51,895 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 63 transitions. [2021-05-06 11:55:51,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-06 11:55:51,895 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:51,895 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:51,895 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-05-06 11:55:51,896 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:51,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:51,896 INFO L82 PathProgramCache]: Analyzing trace with hash -1089810428, now seen corresponding path program 11 times [2021-05-06 11:55:51,896 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:51,896 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [280500238] [2021-05-06 11:55:51,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:51,902 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:55:51,915 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:51,916 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:51,925 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:51,927 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:51,939 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:55:51,953 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 11:55:51,956 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:51,965 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:51,969 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:51,977 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:51,983 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:51,984 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:51,986 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:51,991 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:51,995 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:51,999 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:52,005 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:52,009 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:52,024 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:52,028 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:52,037 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:52,039 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:52,053 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:52,068 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:52,069 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:52,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:52,111 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:52,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:52,116 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:52,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:52,281 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:52,281 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [280500238] [2021-05-06 11:55:52,282 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [280500238] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:52,282 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:52,282 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:55:52,282 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548021566] [2021-05-06 11:55:52,282 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:55:52,282 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:52,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:55:52,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:55:52,283 INFO L87 Difference]: Start difference. First operand 60 states and 63 transitions. Second operand has 17 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 16 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:52,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:52,953 INFO L93 Difference]: Finished difference Result 73 states and 81 transitions. [2021-05-06 11:55:52,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 11:55:52,954 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 16 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2021-05-06 11:55:52,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:52,955 INFO L225 Difference]: With dead ends: 73 [2021-05-06 11:55:52,955 INFO L226 Difference]: Without dead ends: 64 [2021-05-06 11:55:52,955 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 456.1ms TimeCoverageRelationStatistics Valid=162, Invalid=960, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 11:55:52,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-06 11:55:52,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-05-06 11:55:52,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 59 states have (on average 1.0677966101694916) internal successors, (63), 59 states have internal predecessors, (63), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:52,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 67 transitions. [2021-05-06 11:55:52,960 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 67 transitions. Word has length 57 [2021-05-06 11:55:52,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:52,960 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 67 transitions. [2021-05-06 11:55:52,960 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 16 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:52,960 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 67 transitions. [2021-05-06 11:55:52,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-06 11:55:52,961 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:52,961 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:52,961 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-05-06 11:55:52,961 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:52,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:52,961 INFO L82 PathProgramCache]: Analyzing trace with hash 176944219, now seen corresponding path program 12 times [2021-05-06 11:55:52,961 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:52,961 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1358436714] [2021-05-06 11:55:52,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:52,967 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:55:52,980 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:52,981 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:52,988 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:52,990 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:52,997 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:55:53,010 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:53,019 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:53,019 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:53,023 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:53,031 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:53,038 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:53,038 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:53,040 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:53,046 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:53,049 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:53,053 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:53,060 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:53,067 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:53,081 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:53,082 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:53,089 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:53,091 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:53,099 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:53,112 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:53,113 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:53,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:53,154 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:53,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:53,157 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:53,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:53,338 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:53,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1358436714] [2021-05-06 11:55:53,338 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1358436714] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:53,338 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:53,338 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:55:53,338 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787665101] [2021-05-06 11:55:53,338 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:55:53,338 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:53,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:55:53,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=356, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:55:53,339 INFO L87 Difference]: Start difference. First operand 64 states and 67 transitions. Second operand has 18 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 17 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:54,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:54,005 INFO L93 Difference]: Finished difference Result 77 states and 85 transitions. [2021-05-06 11:55:54,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 11:55:54,005 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 17 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 61 [2021-05-06 11:55:54,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:54,006 INFO L225 Difference]: With dead ends: 77 [2021-05-06 11:55:54,006 INFO L226 Difference]: Without dead ends: 68 [2021-05-06 11:55:54,006 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 225 ImplicationChecksByTransitivity, 499.3ms TimeCoverageRelationStatistics Valid=148, Invalid=1112, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 11:55:54,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-06 11:55:54,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-05-06 11:55:54,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 63 states have (on average 1.0634920634920635) internal successors, (67), 63 states have internal predecessors, (67), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:54,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 71 transitions. [2021-05-06 11:55:54,011 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 71 transitions. Word has length 61 [2021-05-06 11:55:54,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:54,011 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 71 transitions. [2021-05-06 11:55:54,011 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 17 states have internal predecessors, (57), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:54,011 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 71 transitions. [2021-05-06 11:55:54,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-06 11:55:54,012 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:54,012 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:54,012 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2021-05-06 11:55:54,012 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:54,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:54,012 INFO L82 PathProgramCache]: Analyzing trace with hash -1381690062, now seen corresponding path program 13 times [2021-05-06 11:55:54,012 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:54,012 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1761923986] [2021-05-06 11:55:54,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:54,019 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:55:54,020 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:54,021 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:54,028 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:54,030 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:54,048 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:55:54,061 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 11:55:54,064 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:54,070 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:54,074 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:54,078 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:54,085 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:54,086 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:54,087 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:54,088 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:54,092 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:54,102 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:54,109 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:54,115 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:54,116 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:54,118 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:54,128 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:54,130 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:54,150 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:54,163 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:54,164 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:54,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:54,219 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:54,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:54,223 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:54,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:54,425 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:54,425 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1761923986] [2021-05-06 11:55:54,425 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1761923986] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:54,425 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:54,425 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 11:55:54,425 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709033963] [2021-05-06 11:55:54,426 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 11:55:54,426 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:54,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 11:55:54,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=395, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:55:54,426 INFO L87 Difference]: Start difference. First operand 68 states and 71 transitions. Second operand has 19 states, 19 states have (on average 3.210526315789474) internal successors, (61), 18 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:55,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:55,248 INFO L93 Difference]: Finished difference Result 81 states and 89 transitions. [2021-05-06 11:55:55,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 11:55:55,248 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.210526315789474) internal successors, (61), 18 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-05-06 11:55:55,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:55,249 INFO L225 Difference]: With dead ends: 81 [2021-05-06 11:55:55,249 INFO L226 Difference]: Without dead ends: 72 [2021-05-06 11:55:55,249 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 249 ImplicationChecksByTransitivity, 581.6ms TimeCoverageRelationStatistics Valid=156, Invalid=1250, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 11:55:55,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-06 11:55:55,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2021-05-06 11:55:55,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 67 states have (on average 1.0597014925373134) internal successors, (71), 67 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 11:55:55,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 75 transitions. [2021-05-06 11:55:55,256 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 75 transitions. Word has length 65 [2021-05-06 11:55:55,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:55,256 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 75 transitions. [2021-05-06 11:55:55,256 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.210526315789474) internal successors, (61), 18 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:55,256 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 75 transitions. [2021-05-06 11:55:55,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 11:55:55,257 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:55,257 INFO L523 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:55,257 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-05-06 11:55:55,257 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:55,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:55,257 INFO L82 PathProgramCache]: Analyzing trace with hash -352062839, now seen corresponding path program 14 times [2021-05-06 11:55:55,257 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:55,257 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [689716286] [2021-05-06 11:55:55,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:55,266 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:55:55,279 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:55,282 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:55,290 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:55,292 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:55,300 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:55:55,313 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 11:55:55,316 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:55,316 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:55,320 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:55,328 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:55,335 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:55,335 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:55,337 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:55,338 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:55,341 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:55,349 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:55,356 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:55,359 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:55,374 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:55,375 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:55,383 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:55,385 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:55,395 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:55,411 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:55,412 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:55,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:55,442 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:55,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:55,446 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:55,447 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:55,681 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:55,681 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [689716286] [2021-05-06 11:55:55,681 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [689716286] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:55,681 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:55,681 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 11:55:55,681 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934953213] [2021-05-06 11:55:55,681 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 11:55:55,681 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:55,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 11:55:55,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=436, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:55:55,682 INFO L87 Difference]: Start difference. First operand 72 states and 75 transitions. Second operand has 20 states, 20 states have (on average 3.25) internal successors, (65), 19 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:56,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:56,475 INFO L93 Difference]: Finished difference Result 85 states and 93 transitions. [2021-05-06 11:55:56,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 11:55:56,476 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.25) internal successors, (65), 19 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 69 [2021-05-06 11:55:56,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:56,477 INFO L225 Difference]: With dead ends: 85 [2021-05-06 11:55:56,477 INFO L226 Difference]: Without dead ends: 76 [2021-05-06 11:55:56,477 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 598.0ms TimeCoverageRelationStatistics Valid=164, Invalid=1396, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 11:55:56,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-06 11:55:56,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2021-05-06 11:55:56,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.056338028169014) internal successors, (75), 71 states have internal predecessors, (75), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:56,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 79 transitions. [2021-05-06 11:55:56,482 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 79 transitions. Word has length 69 [2021-05-06 11:55:56,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:56,482 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 79 transitions. [2021-05-06 11:55:56,482 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 3.25) internal successors, (65), 19 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:56,482 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 79 transitions. [2021-05-06 11:55:56,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 11:55:56,483 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:56,484 INFO L523 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:56,484 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2021-05-06 11:55:56,484 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:56,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:56,484 INFO L82 PathProgramCache]: Analyzing trace with hash 2021018720, now seen corresponding path program 15 times [2021-05-06 11:55:56,484 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:56,484 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [476951392] [2021-05-06 11:55:56,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:56,499 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:55:56,500 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:56,501 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:56,508 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:56,510 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:56,528 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:55:56,541 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:56,548 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:56,548 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:56,552 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:56,560 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:56,567 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:56,568 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:56,569 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:56,570 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:56,573 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:56,582 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:56,588 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:56,591 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:56,592 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:56,593 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:56,601 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:56,603 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:56,627 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:56,640 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:56,641 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:56,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:56,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:56,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:56,681 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:56,684 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:56,914 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:56,914 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [476951392] [2021-05-06 11:55:56,914 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [476951392] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:56,914 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:56,914 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:55:56,914 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [967375643] [2021-05-06 11:55:56,915 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:55:56,915 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:56,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:55:56,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=479, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:55:56,916 INFO L87 Difference]: Start difference. First operand 76 states and 79 transitions. Second operand has 21 states, 21 states have (on average 3.2857142857142856) internal successors, (69), 20 states have internal predecessors, (69), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:57,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:57,771 INFO L93 Difference]: Finished difference Result 89 states and 97 transitions. [2021-05-06 11:55:57,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:55:57,772 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.2857142857142856) internal successors, (69), 20 states have internal predecessors, (69), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 73 [2021-05-06 11:55:57,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:57,772 INFO L225 Difference]: With dead ends: 89 [2021-05-06 11:55:57,772 INFO L226 Difference]: Without dead ends: 80 [2021-05-06 11:55:57,773 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 631.7ms TimeCoverageRelationStatistics Valid=172, Invalid=1550, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 11:55:57,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-05-06 11:55:57,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2021-05-06 11:55:57,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 75 states have (on average 1.0533333333333332) internal successors, (79), 75 states have internal predecessors, (79), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:57,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 83 transitions. [2021-05-06 11:55:57,777 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 83 transitions. Word has length 73 [2021-05-06 11:55:57,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:57,777 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 83 transitions. [2021-05-06 11:55:57,777 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 3.2857142857142856) internal successors, (69), 20 states have internal predecessors, (69), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:57,778 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 83 transitions. [2021-05-06 11:55:57,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-06 11:55:57,778 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:57,778 INFO L523 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:57,778 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2021-05-06 11:55:57,778 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:57,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:57,779 INFO L82 PathProgramCache]: Analyzing trace with hash -286661961, now seen corresponding path program 16 times [2021-05-06 11:55:57,779 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:57,779 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1598665551] [2021-05-06 11:55:57,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:57,793 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:55:57,794 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:57,796 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:57,805 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:57,807 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:57,828 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:55:57,844 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:57,847 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:57,848 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:57,852 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:57,862 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:57,869 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:57,870 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:57,872 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:57,878 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:57,881 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:57,885 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:57,892 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:57,898 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:57,912 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:57,913 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:57,921 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:57,923 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:57,931 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:57,944 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:57,945 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:57,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:57,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:57,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:57,990 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:57,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:58,249 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:58,250 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1598665551] [2021-05-06 11:55:58,250 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1598665551] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:58,250 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:58,250 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:55:58,250 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855847027] [2021-05-06 11:55:58,250 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:55:58,250 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:58,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:55:58,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=524, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:55:58,251 INFO L87 Difference]: Start difference. First operand 80 states and 83 transitions. Second operand has 22 states, 22 states have (on average 3.3181818181818183) internal successors, (73), 21 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 11:55:59,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:59,177 INFO L93 Difference]: Finished difference Result 93 states and 101 transitions. [2021-05-06 11:55:59,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 11:55:59,178 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.3181818181818183) internal successors, (73), 21 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 11:55:59,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:59,178 INFO L225 Difference]: With dead ends: 93 [2021-05-06 11:55:59,178 INFO L226 Difference]: Without dead ends: 84 [2021-05-06 11:55:59,179 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 684.7ms TimeCoverageRelationStatistics Valid=180, Invalid=1712, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 11:55:59,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-06 11:55:59,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2021-05-06 11:55:59,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 79 states have (on average 1.0506329113924051) internal successors, (83), 79 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 11:55:59,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 87 transitions. [2021-05-06 11:55:59,184 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 87 transitions. Word has length 77 [2021-05-06 11:55:59,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:59,184 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 87 transitions. [2021-05-06 11:55:59,184 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 3.3181818181818183) internal successors, (73), 21 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 11:55:59,184 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 87 transitions. [2021-05-06 11:55:59,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-06 11:55:59,184 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:59,185 INFO L523 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:59,185 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2021-05-06 11:55:59,185 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:59,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:59,185 INFO L82 PathProgramCache]: Analyzing trace with hash 980186510, now seen corresponding path program 17 times [2021-05-06 11:55:59,185 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:59,185 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [438324784] [2021-05-06 11:55:59,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:59,192 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:55:59,205 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:59,206 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:59,214 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:59,216 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:59,224 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:55:59,238 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:59,241 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:59,247 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:59,250 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:59,254 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:59,261 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:59,262 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:59,263 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:59,264 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:59,267 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:59,276 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:59,283 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:59,286 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:59,299 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:59,300 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:59,308 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:59,310 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:59,327 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:59,342 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:59,343 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:59,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:59,387 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:59,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:59,390 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:59,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:59,680 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:59,680 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [438324784] [2021-05-06 11:55:59,680 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [438324784] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:59,680 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:59,680 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 11:55:59,680 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271833102] [2021-05-06 11:55:59,681 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 11:55:59,681 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:59,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 11:55:59,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=571, Unknown=0, NotChecked=0, Total=650 [2021-05-06 11:55:59,681 INFO L87 Difference]: Start difference. First operand 84 states and 87 transitions. Second operand has 23 states, 23 states have (on average 3.347826086956522) internal successors, (77), 22 states have internal predecessors, (77), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:00,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:00,709 INFO L93 Difference]: Finished difference Result 97 states and 105 transitions. [2021-05-06 11:56:00,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 11:56:00,710 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.347826086956522) internal successors, (77), 22 states have internal predecessors, (77), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 81 [2021-05-06 11:56:00,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:00,710 INFO L225 Difference]: With dead ends: 97 [2021-05-06 11:56:00,710 INFO L226 Difference]: Without dead ends: 88 [2021-05-06 11:56:00,711 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 753.8ms TimeCoverageRelationStatistics Valid=188, Invalid=1882, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 11:56:00,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-05-06 11:56:00,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2021-05-06 11:56:00,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 83 states have (on average 1.0481927710843373) internal successors, (87), 83 states have internal predecessors, (87), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:00,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 91 transitions. [2021-05-06 11:56:00,715 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 91 transitions. Word has length 81 [2021-05-06 11:56:00,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:00,716 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 91 transitions. [2021-05-06 11:56:00,716 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 3.347826086956522) internal successors, (77), 22 states have internal predecessors, (77), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:00,716 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 91 transitions. [2021-05-06 11:56:00,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-06 11:56:00,716 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:00,716 INFO L523 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:00,716 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2021-05-06 11:56:00,716 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:00,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:00,717 INFO L82 PathProgramCache]: Analyzing trace with hash 170640613, now seen corresponding path program 18 times [2021-05-06 11:56:00,717 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:00,717 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [921687160] [2021-05-06 11:56:00,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:00,724 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:56:00,725 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:00,729 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:00,736 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:00,737 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:00,755 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:56:00,770 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 11:56:00,773 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:00,773 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:00,777 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:00,786 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:00,793 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:00,794 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:00,795 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:00,801 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:00,805 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:00,809 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:00,817 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:00,820 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:00,833 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:00,834 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:00,842 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:00,844 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:00,852 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:00,865 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:00,866 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:00,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:00,896 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:00,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:00,899 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:00,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:01,187 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:01,187 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [921687160] [2021-05-06 11:56:01,187 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [921687160] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:01,187 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:01,187 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:56:01,187 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958384018] [2021-05-06 11:56:01,188 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:56:01,188 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:01,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:56:01,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=602, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:56:01,188 INFO L87 Difference]: Start difference. First operand 88 states and 91 transitions. Second operand has 24 states, 24 states have (on average 3.375) internal successors, (81), 23 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:02,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:02,289 INFO L93 Difference]: Finished difference Result 101 states and 109 transitions. [2021-05-06 11:56:02,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 11:56:02,289 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.375) internal successors, (81), 23 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 85 [2021-05-06 11:56:02,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:02,290 INFO L225 Difference]: With dead ends: 101 [2021-05-06 11:56:02,290 INFO L226 Difference]: Without dead ends: 92 [2021-05-06 11:56:02,290 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 366 ImplicationChecksByTransitivity, 778.0ms TimeCoverageRelationStatistics Valid=232, Invalid=2024, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 11:56:02,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-06 11:56:02,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2021-05-06 11:56:02,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 87 states have (on average 1.0459770114942528) internal successors, (91), 87 states have internal predecessors, (91), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:02,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 95 transitions. [2021-05-06 11:56:02,295 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 95 transitions. Word has length 85 [2021-05-06 11:56:02,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:02,295 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 95 transitions. [2021-05-06 11:56:02,295 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 3.375) internal successors, (81), 23 states have internal predecessors, (81), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:02,295 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 95 transitions. [2021-05-06 11:56:02,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-06 11:56:02,296 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:02,296 INFO L523 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:02,296 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2021-05-06 11:56:02,296 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:02,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:02,296 INFO L82 PathProgramCache]: Analyzing trace with hash 1081446588, now seen corresponding path program 19 times [2021-05-06 11:56:02,296 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:02,296 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1713729797] [2021-05-06 11:56:02,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:02,307 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:56:02,320 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:02,321 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:02,328 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:02,331 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:02,339 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:56:02,352 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 11:56:02,355 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:02,361 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:02,365 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:02,368 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:02,375 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:02,376 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:02,378 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:02,384 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:02,388 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:02,391 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:02,398 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:02,402 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:02,418 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:02,419 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:02,427 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:02,429 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:02,438 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:02,454 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:02,455 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:02,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:02,486 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:02,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:02,490 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:02,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:02,819 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:02,819 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1713729797] [2021-05-06 11:56:02,819 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1713729797] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:02,819 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:02,819 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 11:56:02,819 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385413569] [2021-05-06 11:56:02,820 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 11:56:02,820 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:02,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 11:56:02,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=671, Unknown=0, NotChecked=0, Total=756 [2021-05-06 11:56:02,820 INFO L87 Difference]: Start difference. First operand 92 states and 95 transitions. Second operand has 25 states, 25 states have (on average 3.4) internal successors, (85), 24 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 11:56:04,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:04,039 INFO L93 Difference]: Finished difference Result 105 states and 113 transitions. [2021-05-06 11:56:04,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 11:56:04,040 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.4) internal successors, (85), 24 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 11:56:04,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:04,040 INFO L225 Difference]: With dead ends: 105 [2021-05-06 11:56:04,040 INFO L226 Difference]: Without dead ends: 96 [2021-05-06 11:56:04,041 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 414 ImplicationChecksByTransitivity, 841.0ms TimeCoverageRelationStatistics Valid=204, Invalid=2246, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 11:56:04,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-06 11:56:04,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2021-05-06 11:56:04,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 91 states have (on average 1.043956043956044) internal successors, (95), 91 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 11:56:04,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 99 transitions. [2021-05-06 11:56:04,046 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 99 transitions. Word has length 89 [2021-05-06 11:56:04,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:04,046 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 99 transitions. [2021-05-06 11:56:04,046 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 3.4) internal successors, (85), 24 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 11:56:04,046 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 99 transitions. [2021-05-06 11:56:04,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-06 11:56:04,046 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:04,046 INFO L523 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:04,046 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2021-05-06 11:56:04,047 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:04,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:04,047 INFO L82 PathProgramCache]: Analyzing trace with hash 1656199443, now seen corresponding path program 20 times [2021-05-06 11:56:04,047 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:04,047 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1365975597] [2021-05-06 11:56:04,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:04,059 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:56:04,059 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:04,060 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:04,067 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:04,068 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:04,085 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:56:04,097 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 11:56:04,100 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:04,100 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:04,103 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:04,112 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:04,118 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:04,119 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:04,120 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:04,121 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:04,124 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:04,133 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:04,139 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:04,143 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:04,156 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:04,157 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:04,164 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:04,166 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:04,173 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:04,186 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:04,187 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:04,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:04,215 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:04,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:04,218 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:04,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:04,544 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:04,544 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1365975597] [2021-05-06 11:56:04,544 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1365975597] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:04,544 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:04,544 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 11:56:04,544 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542720268] [2021-05-06 11:56:04,545 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 11:56:04,545 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:04,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 11:56:04,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=724, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:56:04,545 INFO L87 Difference]: Start difference. First operand 96 states and 99 transitions. Second operand has 26 states, 26 states have (on average 3.423076923076923) internal successors, (89), 25 states have internal predecessors, (89), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:05,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:05,830 INFO L93 Difference]: Finished difference Result 109 states and 117 transitions. [2021-05-06 11:56:05,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-06 11:56:05,832 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.423076923076923) internal successors, (89), 25 states have internal predecessors, (89), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 93 [2021-05-06 11:56:05,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:05,833 INFO L225 Difference]: With dead ends: 109 [2021-05-06 11:56:05,833 INFO L226 Difference]: Without dead ends: 100 [2021-05-06 11:56:05,833 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 888.1ms TimeCoverageRelationStatistics Valid=212, Invalid=2440, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 11:56:05,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-05-06 11:56:05,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2021-05-06 11:56:05,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 95 states have (on average 1.0421052631578946) internal successors, (99), 95 states have internal predecessors, (99), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:05,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 103 transitions. [2021-05-06 11:56:05,838 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 103 transitions. Word has length 93 [2021-05-06 11:56:05,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:05,838 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 103 transitions. [2021-05-06 11:56:05,839 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 3.423076923076923) internal successors, (89), 25 states have internal predecessors, (89), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:05,839 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 103 transitions. [2021-05-06 11:56:05,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-06 11:56:05,839 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:05,839 INFO L523 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:05,839 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2021-05-06 11:56:05,839 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:05,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:05,839 INFO L82 PathProgramCache]: Analyzing trace with hash 159358442, now seen corresponding path program 21 times [2021-05-06 11:56:05,840 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:05,840 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1797725163] [2021-05-06 11:56:05,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:05,847 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:56:05,847 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:05,849 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:05,857 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:05,859 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:05,877 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:56:05,890 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:05,893 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:05,894 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:05,898 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:05,907 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:05,918 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:05,918 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:05,920 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:05,920 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:05,924 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:05,932 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:05,939 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:05,941 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:05,954 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:05,955 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:05,962 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:05,964 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:05,971 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:05,984 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:05,985 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:05,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:06,015 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:06,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:06,027 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:06,029 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:06,433 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:06,433 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1797725163] [2021-05-06 11:56:06,433 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1797725163] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:06,433 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:06,433 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 11:56:06,433 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1315807245] [2021-05-06 11:56:06,433 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 11:56:06,433 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:06,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 11:56:06,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=758, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:56:06,434 INFO L87 Difference]: Start difference. First operand 100 states and 103 transitions. Second operand has 27 states, 27 states have (on average 3.4444444444444446) internal successors, (93), 26 states have internal predecessors, (93), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:07,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:07,813 INFO L93 Difference]: Finished difference Result 113 states and 121 transitions. [2021-05-06 11:56:07,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 11:56:07,814 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.4444444444444446) internal successors, (93), 26 states have internal predecessors, (93), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 97 [2021-05-06 11:56:07,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:07,814 INFO L225 Difference]: With dead ends: 113 [2021-05-06 11:56:07,814 INFO L226 Difference]: Without dead ends: 104 [2021-05-06 11:56:07,815 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 456 ImplicationChecksByTransitivity, 984.7ms TimeCoverageRelationStatistics Valid=262, Invalid=2600, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 11:56:07,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-05-06 11:56:07,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2021-05-06 11:56:07,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 99 states have (on average 1.0404040404040404) internal successors, (103), 99 states have internal predecessors, (103), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:07,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 107 transitions. [2021-05-06 11:56:07,820 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 107 transitions. Word has length 97 [2021-05-06 11:56:07,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:07,820 INFO L480 AbstractCegarLoop]: Abstraction has 104 states and 107 transitions. [2021-05-06 11:56:07,820 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 3.4444444444444446) internal successors, (93), 26 states have internal predecessors, (93), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:07,820 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 107 transitions. [2021-05-06 11:56:07,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-06 11:56:07,821 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:07,821 INFO L523 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:07,821 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63 [2021-05-06 11:56:07,821 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:07,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:07,821 INFO L82 PathProgramCache]: Analyzing trace with hash 1350262593, now seen corresponding path program 22 times [2021-05-06 11:56:07,821 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:07,821 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1284964447] [2021-05-06 11:56:07,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:07,828 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:56:07,840 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:07,842 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:07,849 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:07,850 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:07,858 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:56:07,871 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:07,874 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:07,879 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:07,882 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:07,886 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:07,893 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:07,893 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:07,895 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:07,901 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:07,904 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:07,908 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:07,915 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:07,917 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:07,930 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:07,931 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:07,939 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:07,940 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:07,948 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:07,962 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:07,962 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:07,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:07,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:07,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:07,995 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:07,996 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:08,402 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:08,402 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1284964447] [2021-05-06 11:56:08,402 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1284964447] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:08,402 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:08,402 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 11:56:08,402 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858676684] [2021-05-06 11:56:08,402 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 11:56:08,403 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:08,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 11:56:08,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=814, Unknown=0, NotChecked=0, Total=930 [2021-05-06 11:56:08,403 INFO L87 Difference]: Start difference. First operand 104 states and 107 transitions. Second operand has 28 states, 28 states have (on average 3.4642857142857144) internal successors, (97), 27 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 11:56:09,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:09,884 INFO L93 Difference]: Finished difference Result 117 states and 125 transitions. [2021-05-06 11:56:09,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 11:56:09,885 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.4642857142857144) internal successors, (97), 27 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 11:56:09,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:09,885 INFO L225 Difference]: With dead ends: 117 [2021-05-06 11:56:09,885 INFO L226 Difference]: Without dead ends: 108 [2021-05-06 11:56:09,886 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 488 ImplicationChecksByTransitivity, 1030.6ms TimeCoverageRelationStatistics Valid=272, Invalid=2808, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 11:56:09,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-06 11:56:09,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2021-05-06 11:56:09,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 103 states have (on average 1.0388349514563107) internal successors, (107), 103 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 11:56:09,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 111 transitions. [2021-05-06 11:56:09,891 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 111 transitions. Word has length 101 [2021-05-06 11:56:09,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:09,892 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 111 transitions. [2021-05-06 11:56:09,892 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 3.4642857142857144) internal successors, (97), 27 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 11:56:09,892 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 111 transitions. [2021-05-06 11:56:09,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-06 11:56:09,892 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:09,892 INFO L523 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:09,892 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66 [2021-05-06 11:56:09,892 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:09,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:09,893 INFO L82 PathProgramCache]: Analyzing trace with hash 1182309656, now seen corresponding path program 23 times [2021-05-06 11:56:09,893 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:09,893 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1633985240] [2021-05-06 11:56:09,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:09,902 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:56:09,903 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:09,904 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:09,912 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:09,914 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:09,932 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:56:09,945 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 11:56:09,947 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:09,952 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:09,957 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:09,961 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:09,967 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:09,968 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:09,969 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:09,975 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:09,979 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:09,983 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:09,990 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:09,993 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:09,994 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:09,995 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:10,003 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:10,005 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:10,025 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:10,038 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:10,039 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:10,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:10,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:10,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:10,076 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:10,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:10,488 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:10,489 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1633985240] [2021-05-06 11:56:10,489 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1633985240] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:10,489 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:10,489 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 11:56:10,489 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1540128287] [2021-05-06 11:56:10,489 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 11:56:10,489 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:10,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 11:56:10,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=895, Unknown=0, NotChecked=0, Total=992 [2021-05-06 11:56:10,490 INFO L87 Difference]: Start difference. First operand 108 states and 111 transitions. Second operand has 29 states, 29 states have (on average 3.4827586206896552) internal successors, (101), 28 states have internal predecessors, (101), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:12,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:12,078 INFO L93 Difference]: Finished difference Result 121 states and 129 transitions. [2021-05-06 11:56:12,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-06 11:56:12,079 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 3.4827586206896552) internal successors, (101), 28 states have internal predecessors, (101), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 105 [2021-05-06 11:56:12,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:12,079 INFO L225 Difference]: With dead ends: 121 [2021-05-06 11:56:12,079 INFO L226 Difference]: Without dead ends: 112 [2021-05-06 11:56:12,081 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 544 ImplicationChecksByTransitivity, 1079.4ms TimeCoverageRelationStatistics Valid=236, Invalid=3070, Unknown=0, NotChecked=0, Total=3306 [2021-05-06 11:56:12,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-05-06 11:56:12,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2021-05-06 11:56:12,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 107 states have (on average 1.0373831775700935) internal successors, (111), 107 states have internal predecessors, (111), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:12,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 115 transitions. [2021-05-06 11:56:12,086 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 115 transitions. Word has length 105 [2021-05-06 11:56:12,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:12,086 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 115 transitions. [2021-05-06 11:56:12,086 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 3.4827586206896552) internal successors, (101), 28 states have internal predecessors, (101), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:12,086 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 115 transitions. [2021-05-06 11:56:12,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-05-06 11:56:12,087 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:12,087 INFO L523 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:12,087 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69 [2021-05-06 11:56:12,087 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:12,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:12,087 INFO L82 PathProgramCache]: Analyzing trace with hash 1566906223, now seen corresponding path program 24 times [2021-05-06 11:56:12,087 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:12,087 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2135929410] [2021-05-06 11:56:12,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:12,101 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:56:12,114 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:12,115 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:12,122 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:12,123 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:12,131 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:56:12,149 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:12,151 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:12,152 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:12,155 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:12,165 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:12,172 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:12,172 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:12,174 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:12,174 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:12,179 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:12,190 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:12,198 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:12,201 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:12,202 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:12,203 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:12,211 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:12,213 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:12,233 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:12,248 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 11:56:12,249 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:12,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:12,280 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:12,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:12,283 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:12,285 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:12,720 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:12,721 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2135929410] [2021-05-06 11:56:12,721 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2135929410] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:12,721 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:12,721 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 11:56:12,721 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663761345] [2021-05-06 11:56:12,721 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 11:56:12,721 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:12,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 11:56:12,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=932, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:56:12,722 INFO L87 Difference]: Start difference. First operand 112 states and 115 transitions. Second operand has 30 states, 30 states have (on average 3.5) internal successors, (105), 29 states have internal predecessors, (105), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:14,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:14,391 INFO L93 Difference]: Finished difference Result 125 states and 133 transitions. [2021-05-06 11:56:14,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 11:56:14,391 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.5) internal successors, (105), 29 states have internal predecessors, (105), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 109 [2021-05-06 11:56:14,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:14,392 INFO L225 Difference]: With dead ends: 125 [2021-05-06 11:56:14,392 INFO L226 Difference]: Without dead ends: 116 [2021-05-06 11:56:14,393 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 555 ImplicationChecksByTransitivity, 1127.8ms TimeCoverageRelationStatistics Valid=292, Invalid=3248, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 11:56:14,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-05-06 11:56:14,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2021-05-06 11:56:14,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 111 states have (on average 1.0360360360360361) internal successors, (115), 111 states have internal predecessors, (115), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:14,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 119 transitions. [2021-05-06 11:56:14,398 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 119 transitions. Word has length 109 [2021-05-06 11:56:14,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:14,399 INFO L480 AbstractCegarLoop]: Abstraction has 116 states and 119 transitions. [2021-05-06 11:56:14,399 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 3.5) internal successors, (105), 29 states have internal predecessors, (105), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:14,399 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 119 transitions. [2021-05-06 11:56:14,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-06 11:56:14,399 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:14,399 INFO L523 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:14,399 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72 [2021-05-06 11:56:14,399 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:14,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:14,400 INFO L82 PathProgramCache]: Analyzing trace with hash -632385978, now seen corresponding path program 25 times [2021-05-06 11:56:14,400 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:14,400 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [6806645] [2021-05-06 11:56:14,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:14,407 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:56:14,407 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:14,408 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:14,419 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:14,420 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:14,439 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:56:14,453 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:14,455 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:14,455 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:14,459 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:14,471 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:14,478 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:14,478 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:14,481 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:14,481 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:14,485 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:14,493 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:14,501 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:14,504 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:14,518 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:14,519 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:14,527 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:14,529 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:14,537 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:14,550 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:14,550 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:14,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:14,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:14,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:14,586 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:14,587 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:15,064 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:15,064 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [6806645] [2021-05-06 11:56:15,064 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [6806645] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:15,064 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:15,064 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2021-05-06 11:56:15,064 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072919669] [2021-05-06 11:56:15,064 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-06 11:56:15,064 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:15,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-06 11:56:15,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=1019, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 11:56:15,065 INFO L87 Difference]: Start difference. First operand 116 states and 119 transitions. Second operand has 31 states, 31 states have (on average 3.5161290322580645) internal successors, (109), 30 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 11:56:16,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:16,839 INFO L93 Difference]: Finished difference Result 129 states and 137 transitions. [2021-05-06 11:56:16,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-06 11:56:16,840 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 3.5161290322580645) internal successors, (109), 30 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 11:56:16,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:16,840 INFO L225 Difference]: With dead ends: 129 [2021-05-06 11:56:16,840 INFO L226 Difference]: Without dead ends: 120 [2021-05-06 11:56:16,841 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 615 ImplicationChecksByTransitivity, 1198.4ms TimeCoverageRelationStatistics Valid=252, Invalid=3530, Unknown=0, NotChecked=0, Total=3782 [2021-05-06 11:56:16,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-05-06 11:56:16,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2021-05-06 11:56:16,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 115 states have (on average 1.0347826086956522) internal successors, (119), 115 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 11:56:16,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 123 transitions. [2021-05-06 11:56:16,851 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 123 transitions. Word has length 113 [2021-05-06 11:56:16,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:16,851 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 123 transitions. [2021-05-06 11:56:16,852 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 3.5161290322580645) internal successors, (109), 30 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 11:56:16,852 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 123 transitions. [2021-05-06 11:56:16,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-05-06 11:56:16,852 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:16,852 INFO L523 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:16,852 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75 [2021-05-06 11:56:16,852 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:16,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:16,852 INFO L82 PathProgramCache]: Analyzing trace with hash 1164099997, now seen corresponding path program 26 times [2021-05-06 11:56:16,853 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:16,853 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [276108631] [2021-05-06 11:56:16,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:16,858 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:56:16,871 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:16,872 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:16,880 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:16,882 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:16,890 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:56:16,903 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 11:56:16,905 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:16,905 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:16,909 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:16,917 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:16,924 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:16,925 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:16,926 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:16,930 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:16,934 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:16,942 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:16,949 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:16,952 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:16,953 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:16,954 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:16,961 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:16,963 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:16,981 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:16,994 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:16,995 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:16,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:17,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:17,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:17,031 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:17,032 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:17,570 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:17,570 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [276108631] [2021-05-06 11:56:17,570 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [276108631] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:17,570 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:17,571 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 11:56:17,571 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463462095] [2021-05-06 11:56:17,571 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 11:56:17,571 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:17,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 11:56:17,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1058, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:56:17,572 INFO L87 Difference]: Start difference. First operand 120 states and 123 transitions. Second operand has 32 states, 32 states have (on average 3.53125) internal successors, (113), 31 states have internal predecessors, (113), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:19,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:19,463 INFO L93 Difference]: Finished difference Result 133 states and 141 transitions. [2021-05-06 11:56:19,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 11:56:19,464 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.53125) internal successors, (113), 31 states have internal predecessors, (113), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 117 [2021-05-06 11:56:19,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:19,464 INFO L225 Difference]: With dead ends: 133 [2021-05-06 11:56:19,464 INFO L226 Difference]: Without dead ends: 124 [2021-05-06 11:56:19,465 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 626 ImplicationChecksByTransitivity, 1299.4ms TimeCoverageRelationStatistics Valid=312, Invalid=3720, Unknown=0, NotChecked=0, Total=4032 [2021-05-06 11:56:19,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-05-06 11:56:19,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2021-05-06 11:56:19,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 119 states have (on average 1.0336134453781514) internal successors, (123), 119 states have internal predecessors, (123), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:19,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 127 transitions. [2021-05-06 11:56:19,471 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 127 transitions. Word has length 117 [2021-05-06 11:56:19,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:19,471 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 127 transitions. [2021-05-06 11:56:19,471 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 3.53125) internal successors, (113), 31 states have internal predecessors, (113), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:19,471 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 127 transitions. [2021-05-06 11:56:19,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-05-06 11:56:19,472 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:19,472 INFO L523 BasicCegarLoop]: trace histogram [28, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:19,472 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78 [2021-05-06 11:56:19,472 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:19,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:19,472 INFO L82 PathProgramCache]: Analyzing trace with hash -638619276, now seen corresponding path program 27 times [2021-05-06 11:56:19,472 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:19,472 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1960905127] [2021-05-06 11:56:19,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:19,479 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:56:19,480 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:19,481 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:19,489 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:19,491 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:19,509 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:56:19,522 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:19,525 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:19,539 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:19,543 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:19,548 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:19,555 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:19,556 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:19,557 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:19,558 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:19,561 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:19,579 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:19,587 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:19,591 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:19,591 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:19,593 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:19,601 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:19,603 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:19,623 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:19,637 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 11:56:19,638 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:19,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:19,675 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:19,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:19,679 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:19,680 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:20,206 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:20,206 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1960905127] [2021-05-06 11:56:20,206 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1960905127] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:20,206 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:20,206 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 11:56:20,206 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585959441] [2021-05-06 11:56:20,207 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 11:56:20,207 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:20,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 11:56:20,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=1151, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 11:56:20,207 INFO L87 Difference]: Start difference. First operand 124 states and 127 transitions. Second operand has 33 states, 33 states have (on average 3.5454545454545454) internal successors, (117), 32 states have internal predecessors, (117), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:22,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:22,233 INFO L93 Difference]: Finished difference Result 137 states and 145 transitions. [2021-05-06 11:56:22,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 11:56:22,233 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 3.5454545454545454) internal successors, (117), 32 states have internal predecessors, (117), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 121 [2021-05-06 11:56:22,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:22,234 INFO L225 Difference]: With dead ends: 137 [2021-05-06 11:56:22,234 INFO L226 Difference]: Without dead ends: 128 [2021-05-06 11:56:22,235 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 87 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 690 ImplicationChecksByTransitivity, 1343.8ms TimeCoverageRelationStatistics Valid=268, Invalid=4022, Unknown=0, NotChecked=0, Total=4290 [2021-05-06 11:56:22,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-05-06 11:56:22,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 128. [2021-05-06 11:56:22,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 123 states have (on average 1.032520325203252) internal successors, (127), 123 states have internal predecessors, (127), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:22,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 131 transitions. [2021-05-06 11:56:22,241 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 131 transitions. Word has length 121 [2021-05-06 11:56:22,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:22,241 INFO L480 AbstractCegarLoop]: Abstraction has 128 states and 131 transitions. [2021-05-06 11:56:22,241 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 3.5454545454545454) internal successors, (117), 32 states have internal predecessors, (117), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:22,241 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 131 transitions. [2021-05-06 11:56:22,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-06 11:56:22,242 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:22,242 INFO L523 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:22,242 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81 [2021-05-06 11:56:22,242 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:22,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:22,242 INFO L82 PathProgramCache]: Analyzing trace with hash -161325621, now seen corresponding path program 28 times [2021-05-06 11:56:22,242 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:22,242 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [670703405] [2021-05-06 11:56:22,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:22,251 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:56:22,264 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:22,265 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:22,271 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:22,273 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:22,280 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:56:22,293 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:22,295 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:22,301 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:22,304 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:22,308 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:22,315 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:22,315 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:22,317 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:22,322 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:22,325 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:22,329 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:22,336 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:22,338 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:22,351 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:22,352 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:22,359 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:22,360 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:22,368 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:22,381 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 11:56:22,382 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:22,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:22,411 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:22,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:22,414 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:22,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:22,946 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:22,946 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [670703405] [2021-05-06 11:56:22,946 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [670703405] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:22,946 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:22,946 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 11:56:22,946 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [403079004] [2021-05-06 11:56:22,947 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 11:56:22,947 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:22,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 11:56:22,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=1220, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 11:56:22,947 INFO L87 Difference]: Start difference. First operand 128 states and 131 transitions. Second operand has 34 states, 34 states have (on average 3.5588235294117645) internal successors, (121), 33 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 11:56:25,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:25,094 INFO L93 Difference]: Finished difference Result 141 states and 149 transitions. [2021-05-06 11:56:25,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 11:56:25,094 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 3.5588235294117645) internal successors, (121), 33 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 11:56:25,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:25,095 INFO L225 Difference]: With dead ends: 141 [2021-05-06 11:56:25,095 INFO L226 Difference]: Without dead ends: 132 [2021-05-06 11:56:25,095 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 90 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 729 ImplicationChecksByTransitivity, 1379.0ms TimeCoverageRelationStatistics Valid=276, Invalid=4280, Unknown=0, NotChecked=0, Total=4556 [2021-05-06 11:56:25,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-05-06 11:56:25,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2021-05-06 11:56:25,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 127 states have (on average 1.031496062992126) internal successors, (131), 127 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 11:56:25,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 135 transitions. [2021-05-06 11:56:25,102 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 135 transitions. Word has length 125 [2021-05-06 11:56:25,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:25,102 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 135 transitions. [2021-05-06 11:56:25,102 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 3.5588235294117645) internal successors, (121), 33 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 11:56:25,102 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 135 transitions. [2021-05-06 11:56:25,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-05-06 11:56:25,103 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:25,103 INFO L523 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:25,103 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84 [2021-05-06 11:56:25,103 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:25,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:25,104 INFO L82 PathProgramCache]: Analyzing trace with hash -1941354846, now seen corresponding path program 29 times [2021-05-06 11:56:25,104 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:25,104 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [711792208] [2021-05-06 11:56:25,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:25,110 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:56:25,111 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:25,112 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:25,119 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:25,121 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:25,140 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:56:25,153 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:25,155 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:25,161 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:25,164 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:25,168 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:25,175 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:25,175 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:25,177 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:25,183 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:25,187 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:25,191 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:25,198 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:25,201 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:25,213 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:25,214 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:25,222 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:25,224 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:25,231 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:25,245 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 11:56:25,246 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:25,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:25,277 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:25,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:25,280 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 11:56:25,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:25,827 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:25,827 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [711792208] [2021-05-06 11:56:25,827 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [711792208] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:25,828 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:25,828 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-06 11:56:25,828 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288735389] [2021-05-06 11:56:25,828 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-06 11:56:25,828 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:25,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-06 11:56:25,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=1291, Unknown=0, NotChecked=0, Total=1406 [2021-05-06 11:56:25,829 INFO L87 Difference]: Start difference. First operand 132 states and 135 transitions. Second operand has 35 states, 35 states have (on average 3.5714285714285716) internal successors, (125), 34 states have internal predecessors, (125), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:28,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:28,109 INFO L93 Difference]: Finished difference Result 145 states and 153 transitions. [2021-05-06 11:56:28,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-06 11:56:28,110 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.5714285714285716) internal successors, (125), 34 states have internal predecessors, (125), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 129 [2021-05-06 11:56:28,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:28,110 INFO L225 Difference]: With dead ends: 145 [2021-05-06 11:56:28,110 INFO L226 Difference]: Without dead ends: 136 [2021-05-06 11:56:28,111 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 93 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 769 ImplicationChecksByTransitivity, 1444.3ms TimeCoverageRelationStatistics Valid=284, Invalid=4546, Unknown=0, NotChecked=0, Total=4830 [2021-05-06 11:56:28,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-05-06 11:56:28,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2021-05-06 11:56:28,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 131 states have (on average 1.0305343511450382) internal successors, (135), 131 states have internal predecessors, (135), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:28,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 139 transitions. [2021-05-06 11:56:28,117 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 139 transitions. Word has length 129 [2021-05-06 11:56:28,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:28,117 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 139 transitions. [2021-05-06 11:56:28,117 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 3.5714285714285716) internal successors, (125), 34 states have internal predecessors, (125), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:28,117 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 139 transitions. [2021-05-06 11:56:28,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-05-06 11:56:28,118 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:28,118 INFO L523 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:28,118 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable87 [2021-05-06 11:56:28,118 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:28,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:28,118 INFO L82 PathProgramCache]: Analyzing trace with hash -1873679367, now seen corresponding path program 30 times [2021-05-06 11:56:28,118 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:28,118 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1357813086] [2021-05-06 11:56:28,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:28,124 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:56:28,125 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:28,126 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:28,133 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:28,135 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:28,153 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:56:28,166 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:28,168 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:28,174 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:28,177 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:28,181 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:28,187 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:28,188 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:28,191 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:28,191 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:28,194 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:28,203 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:28,209 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:28,212 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:28,213 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:28,214 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:28,221 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:28,223 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:28,241 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:28,254 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:28,255 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:28,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:28,308 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:28,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:28,314 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 11:56:28,322 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:28,967 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:28,967 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1357813086] [2021-05-06 11:56:28,967 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1357813086] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:28,967 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:28,967 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 11:56:28,967 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75448751] [2021-05-06 11:56:28,967 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 11:56:28,967 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:28,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 11:56:28,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1597, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 11:56:28,968 INFO L87 Difference]: Start difference. First operand 136 states and 139 transitions. Second operand has 39 states, 38 states have (on average 3.3947368421052633) internal successors, (129), 37 states have internal predecessors, (129), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:31,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:31,581 INFO L93 Difference]: Finished difference Result 149 states and 157 transitions. [2021-05-06 11:56:31,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 11:56:31,582 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 3.3947368421052633) internal successors, (129), 37 states have internal predecessors, (129), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 133 [2021-05-06 11:56:31,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:31,582 INFO L225 Difference]: With dead ends: 149 [2021-05-06 11:56:31,582 INFO L226 Difference]: Without dead ends: 140 [2021-05-06 11:56:31,583 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 93 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 819 ImplicationChecksByTransitivity, 1649.0ms TimeCoverageRelationStatistics Valid=299, Invalid=5251, Unknown=0, NotChecked=0, Total=5550 [2021-05-06 11:56:31,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-05-06 11:56:31,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 140. [2021-05-06 11:56:31,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 135 states have (on average 1.0296296296296297) internal successors, (139), 135 states have internal predecessors, (139), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:31,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 143 transitions. [2021-05-06 11:56:31,590 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 143 transitions. Word has length 133 [2021-05-06 11:56:31,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:31,590 INFO L480 AbstractCegarLoop]: Abstraction has 140 states and 143 transitions. [2021-05-06 11:56:31,590 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 38 states have (on average 3.3947368421052633) internal successors, (129), 37 states have internal predecessors, (129), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:31,590 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 143 transitions. [2021-05-06 11:56:31,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-06 11:56:31,590 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:31,590 INFO L523 BasicCegarLoop]: trace histogram [32, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:31,590 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90 [2021-05-06 11:56:31,591 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:31,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:31,591 INFO L82 PathProgramCache]: Analyzing trace with hash 1783238096, now seen corresponding path program 31 times [2021-05-06 11:56:31,591 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:31,591 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1386202532] [2021-05-06 11:56:31,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:31,597 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:56:31,598 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:31,599 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:31,607 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:31,609 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:31,630 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:56:31,645 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:31,647 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:31,653 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:31,657 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:31,660 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:31,667 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:31,669 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:31,670 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:31,670 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:31,675 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:31,683 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:31,690 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:31,694 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:31,695 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:31,696 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:31,708 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:31,710 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:31,728 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:31,742 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:31,742 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:31,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:31,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:31,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:31,780 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:31,781 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:32,402 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:32,402 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1386202532] [2021-05-06 11:56:32,402 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1386202532] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:32,402 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:32,402 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2021-05-06 11:56:32,402 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957472050] [2021-05-06 11:56:32,402 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-06 11:56:32,402 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:32,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-06 11:56:32,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=1439, Unknown=0, NotChecked=0, Total=1560 [2021-05-06 11:56:32,403 INFO L87 Difference]: Start difference. First operand 140 states and 143 transitions. Second operand has 37 states, 37 states have (on average 3.5945945945945947) internal successors, (133), 36 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 11:56:35,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:35,011 INFO L93 Difference]: Finished difference Result 153 states and 161 transitions. [2021-05-06 11:56:35,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-06 11:56:35,011 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.5945945945945947) internal successors, (133), 36 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 11:56:35,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:35,012 INFO L225 Difference]: With dead ends: 153 [2021-05-06 11:56:35,012 INFO L226 Difference]: Without dead ends: 144 [2021-05-06 11:56:35,012 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 99 SyntacticMatches, 1 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 852 ImplicationChecksByTransitivity, 1608.2ms TimeCoverageRelationStatistics Valid=300, Invalid=5102, Unknown=0, NotChecked=0, Total=5402 [2021-05-06 11:56:35,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-05-06 11:56:35,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 144. [2021-05-06 11:56:35,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 139 states have (on average 1.0287769784172662) internal successors, (143), 139 states have internal predecessors, (143), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:35,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 147 transitions. [2021-05-06 11:56:35,019 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 147 transitions. Word has length 137 [2021-05-06 11:56:35,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:35,019 INFO L480 AbstractCegarLoop]: Abstraction has 144 states and 147 transitions. [2021-05-06 11:56:35,020 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 3.5945945945945947) internal successors, (133), 36 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 11:56:35,020 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 147 transitions. [2021-05-06 11:56:35,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-05-06 11:56:35,020 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:35,020 INFO L523 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:35,020 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable93 [2021-05-06 11:56:35,020 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:35,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:35,021 INFO L82 PathProgramCache]: Analyzing trace with hash 1696558119, now seen corresponding path program 32 times [2021-05-06 11:56:35,021 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:35,021 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1485769040] [2021-05-06 11:56:35,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:35,026 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:56:35,039 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:35,041 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:35,048 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:35,050 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:35,060 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:56:35,072 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:35,075 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:35,075 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:35,078 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:35,087 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:35,093 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:35,094 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:35,095 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:35,096 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:35,099 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:35,107 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:35,114 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:35,121 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:35,134 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:35,135 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:35,142 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:35,143 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:35,151 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:35,164 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:35,165 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:35,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:35,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:35,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:35,206 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:35,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:35,871 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:35,871 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1485769040] [2021-05-06 11:56:35,871 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1485769040] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:35,871 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:35,871 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2021-05-06 11:56:35,871 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839975142] [2021-05-06 11:56:35,871 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-06 11:56:35,871 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:35,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-06 11:56:35,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=1516, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 11:56:35,872 INFO L87 Difference]: Start difference. First operand 144 states and 147 transitions. Second operand has 38 states, 38 states have (on average 3.6052631578947367) internal successors, (137), 37 states have internal predecessors, (137), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:38,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:38,571 INFO L93 Difference]: Finished difference Result 157 states and 165 transitions. [2021-05-06 11:56:38,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-06 11:56:38,572 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.6052631578947367) internal successors, (137), 37 states have internal predecessors, (137), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 141 [2021-05-06 11:56:38,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:38,573 INFO L225 Difference]: With dead ends: 157 [2021-05-06 11:56:38,573 INFO L226 Difference]: Without dead ends: 148 [2021-05-06 11:56:38,573 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 102 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 895 ImplicationChecksByTransitivity, 1694.6ms TimeCoverageRelationStatistics Valid=308, Invalid=5392, Unknown=0, NotChecked=0, Total=5700 [2021-05-06 11:56:38,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-05-06 11:56:38,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 148. [2021-05-06 11:56:38,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 143 states have (on average 1.027972027972028) internal successors, (147), 143 states have internal predecessors, (147), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:38,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 151 transitions. [2021-05-06 11:56:38,580 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 151 transitions. Word has length 141 [2021-05-06 11:56:38,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:38,580 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 151 transitions. [2021-05-06 11:56:38,580 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 3.6052631578947367) internal successors, (137), 37 states have internal predecessors, (137), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:38,580 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 151 transitions. [2021-05-06 11:56:38,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-05-06 11:56:38,581 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:38,581 INFO L523 BasicCegarLoop]: trace histogram [34, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:38,581 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable96 [2021-05-06 11:56:38,581 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:38,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:38,581 INFO L82 PathProgramCache]: Analyzing trace with hash 517981950, now seen corresponding path program 33 times [2021-05-06 11:56:38,581 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:38,581 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1111292056] [2021-05-06 11:56:38,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:38,589 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:56:38,602 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:38,604 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:38,617 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:38,619 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:38,627 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:56:38,640 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:38,642 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:38,648 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:38,651 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:38,655 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:38,662 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:38,663 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:38,664 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:38,664 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:38,668 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:38,677 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:38,683 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:38,687 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:38,700 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:38,702 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:38,709 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:38,711 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:38,719 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:38,733 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:38,733 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:38,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:38,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:38,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:38,772 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:38,773 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:39,438 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:39,439 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1111292056] [2021-05-06 11:56:39,439 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1111292056] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:39,439 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:39,439 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 11:56:39,439 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [34338915] [2021-05-06 11:56:39,439 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 11:56:39,439 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:39,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 11:56:39,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=1595, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 11:56:39,440 INFO L87 Difference]: Start difference. First operand 148 states and 151 transitions. Second operand has 39 states, 39 states have (on average 3.6153846153846154) internal successors, (141), 38 states have internal predecessors, (141), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:42,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:42,231 INFO L93 Difference]: Finished difference Result 161 states and 169 transitions. [2021-05-06 11:56:42,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 11:56:42,232 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 3.6153846153846154) internal successors, (141), 38 states have internal predecessors, (141), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 145 [2021-05-06 11:56:42,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:42,232 INFO L225 Difference]: With dead ends: 161 [2021-05-06 11:56:42,232 INFO L226 Difference]: Without dead ends: 152 [2021-05-06 11:56:42,233 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 105 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 939 ImplicationChecksByTransitivity, 1739.5ms TimeCoverageRelationStatistics Valid=316, Invalid=5690, Unknown=0, NotChecked=0, Total=6006 [2021-05-06 11:56:42,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-05-06 11:56:42,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 152. [2021-05-06 11:56:42,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 147 states have (on average 1.0272108843537415) internal successors, (151), 147 states have internal predecessors, (151), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:42,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 155 transitions. [2021-05-06 11:56:42,240 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 155 transitions. Word has length 145 [2021-05-06 11:56:42,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:42,240 INFO L480 AbstractCegarLoop]: Abstraction has 152 states and 155 transitions. [2021-05-06 11:56:42,240 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 3.6153846153846154) internal successors, (141), 38 states have internal predecessors, (141), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:42,240 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 155 transitions. [2021-05-06 11:56:42,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-05-06 11:56:42,240 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:42,240 INFO L523 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:42,241 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable99 [2021-05-06 11:56:42,241 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:42,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:42,241 INFO L82 PathProgramCache]: Analyzing trace with hash -122102187, now seen corresponding path program 34 times [2021-05-06 11:56:42,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:42,241 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2068122936] [2021-05-06 11:56:42,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:42,248 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:56:42,249 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:42,250 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:42,256 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:42,258 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:42,276 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:56:42,289 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:42,291 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:42,296 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:42,300 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:42,303 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:42,310 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:42,311 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:42,312 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:42,312 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:42,316 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:42,324 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:42,331 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:42,334 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:42,334 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:42,340 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:42,347 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:42,349 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:42,369 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:42,383 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:42,383 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:42,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:42,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:42,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:42,446 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:42,447 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:43,266 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:43,266 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2068122936] [2021-05-06 11:56:43,267 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2068122936] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:43,267 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:43,267 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-06 11:56:43,267 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94617576] [2021-05-06 11:56:43,267 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-06 11:56:43,267 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:43,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-06 11:56:43,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=1933, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 11:56:43,268 INFO L87 Difference]: Start difference. First operand 152 states and 155 transitions. Second operand has 43 states, 42 states have (on average 3.4523809523809526) internal successors, (145), 41 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 11:56:46,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:46,370 INFO L93 Difference]: Finished difference Result 165 states and 173 transitions. [2021-05-06 11:56:46,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-06 11:56:46,371 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 42 states have (on average 3.4523809523809526) internal successors, (145), 41 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 11:56:46,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:46,372 INFO L225 Difference]: With dead ends: 165 [2021-05-06 11:56:46,372 INFO L226 Difference]: Without dead ends: 156 [2021-05-06 11:56:46,372 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 105 SyntacticMatches, 1 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 993 ImplicationChecksByTransitivity, 1991.7ms TimeCoverageRelationStatistics Valid=331, Invalid=6475, Unknown=0, NotChecked=0, Total=6806 [2021-05-06 11:56:46,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-05-06 11:56:46,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 156. [2021-05-06 11:56:46,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 151 states have (on average 1.0264900662251655) internal successors, (155), 151 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 11:56:46,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 159 transitions. [2021-05-06 11:56:46,379 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 159 transitions. Word has length 149 [2021-05-06 11:56:46,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:46,379 INFO L480 AbstractCegarLoop]: Abstraction has 156 states and 159 transitions. [2021-05-06 11:56:46,379 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 42 states have (on average 3.4523809523809526) internal successors, (145), 41 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 11:56:46,379 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 159 transitions. [2021-05-06 11:56:46,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2021-05-06 11:56:46,380 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:46,380 INFO L523 BasicCegarLoop]: trace histogram [36, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:46,380 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable102 [2021-05-06 11:56:46,380 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:46,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:46,380 INFO L82 PathProgramCache]: Analyzing trace with hash -2030538196, now seen corresponding path program 35 times [2021-05-06 11:56:46,380 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:46,380 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1888942740] [2021-05-06 11:56:46,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:46,387 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:56:46,399 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:46,400 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:46,406 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:46,408 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:46,419 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:56:46,431 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:46,433 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:46,439 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:46,442 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:46,446 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:46,453 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:46,453 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:46,455 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:46,460 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:46,464 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:46,467 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:46,474 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:46,477 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:46,478 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:46,479 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:46,486 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:46,487 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:46,505 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:46,518 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:46,519 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:46,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:46,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:46,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:46,551 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:46,553 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:47,280 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:47,281 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1888942740] [2021-05-06 11:56:47,281 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1888942740] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:47,281 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:47,281 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 11:56:47,281 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8513958] [2021-05-06 11:56:47,281 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-06 11:56:47,281 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:47,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-06 11:56:47,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=1724, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 11:56:47,282 INFO L87 Difference]: Start difference. First operand 156 states and 159 transitions. Second operand has 41 states, 41 states have (on average 3.6341463414634148) internal successors, (149), 40 states have internal predecessors, (149), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:50,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:50,359 INFO L93 Difference]: Finished difference Result 169 states and 177 transitions. [2021-05-06 11:56:50,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-06 11:56:50,359 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 3.6341463414634148) internal successors, (149), 40 states have internal predecessors, (149), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 153 [2021-05-06 11:56:50,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:50,360 INFO L225 Difference]: With dead ends: 169 [2021-05-06 11:56:50,360 INFO L226 Difference]: Without dead ends: 160 [2021-05-06 11:56:50,361 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 111 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 995 ImplicationChecksByTransitivity, 1885.4ms TimeCoverageRelationStatistics Valid=402, Invalid=6240, Unknown=0, NotChecked=0, Total=6642 [2021-05-06 11:56:50,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-05-06 11:56:50,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2021-05-06 11:56:50,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 155 states have (on average 1.0258064516129033) internal successors, (159), 155 states have internal predecessors, (159), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:50,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 163 transitions. [2021-05-06 11:56:50,368 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 163 transitions. Word has length 153 [2021-05-06 11:56:50,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:50,368 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 163 transitions. [2021-05-06 11:56:50,368 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 3.6341463414634148) internal successors, (149), 40 states have internal predecessors, (149), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:50,368 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 163 transitions. [2021-05-06 11:56:50,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-05-06 11:56:50,368 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:50,369 INFO L523 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:50,369 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable105 [2021-05-06 11:56:50,369 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:50,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:50,369 INFO L82 PathProgramCache]: Analyzing trace with hash 17580675, now seen corresponding path program 36 times [2021-05-06 11:56:50,369 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:50,369 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [123331712] [2021-05-06 11:56:50,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:50,380 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:56:50,381 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:50,382 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:50,389 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:50,391 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:50,408 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:56:50,421 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:50,423 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:50,428 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:50,432 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:50,435 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:50,442 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:50,443 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:50,444 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:50,449 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:50,453 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:50,456 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:50,463 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:50,466 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:50,479 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:50,480 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:50,486 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:50,488 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:50,496 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:50,509 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 11:56:50,510 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:50,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:50,540 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:50,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:50,550 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:50,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:51,320 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:51,321 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [123331712] [2021-05-06 11:56:51,321 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [123331712] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:51,321 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:51,321 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-06 11:56:51,321 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842309810] [2021-05-06 11:56:51,321 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 11:56:51,321 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:51,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 11:56:51,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=1808, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 11:56:51,322 INFO L87 Difference]: Start difference. First operand 160 states and 163 transitions. Second operand has 42 states, 42 states have (on average 3.642857142857143) internal successors, (153), 41 states have internal predecessors, (153), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:54,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:54,530 INFO L93 Difference]: Finished difference Result 173 states and 181 transitions. [2021-05-06 11:56:54,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-06 11:56:54,530 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 3.642857142857143) internal successors, (153), 41 states have internal predecessors, (153), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 157 [2021-05-06 11:56:54,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:54,531 INFO L225 Difference]: With dead ends: 173 [2021-05-06 11:56:54,531 INFO L226 Difference]: Without dead ends: 164 [2021-05-06 11:56:54,531 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 114 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1041 ImplicationChecksByTransitivity, 1960.0ms TimeCoverageRelationStatistics Valid=412, Invalid=6560, Unknown=0, NotChecked=0, Total=6972 [2021-05-06 11:56:54,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-05-06 11:56:54,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 164. [2021-05-06 11:56:54,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 159 states have (on average 1.0251572327044025) internal successors, (163), 159 states have internal predecessors, (163), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:54,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 167 transitions. [2021-05-06 11:56:54,538 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 167 transitions. Word has length 157 [2021-05-06 11:56:54,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:54,539 INFO L480 AbstractCegarLoop]: Abstraction has 164 states and 167 transitions. [2021-05-06 11:56:54,539 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 3.642857142857143) internal successors, (153), 41 states have internal predecessors, (153), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:54,539 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 167 transitions. [2021-05-06 11:56:54,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-05-06 11:56:54,539 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:54,539 INFO L523 BasicCegarLoop]: trace histogram [38, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:54,539 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable108 [2021-05-06 11:56:54,539 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:54,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:54,540 INFO L82 PathProgramCache]: Analyzing trace with hash -1316876454, now seen corresponding path program 37 times [2021-05-06 11:56:54,540 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:54,540 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1407972661] [2021-05-06 11:56:54,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:54,546 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:56:54,546 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:54,547 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:54,554 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:54,556 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:54,574 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:56:54,587 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:54,591 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:54,597 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:54,600 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:54,604 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:54,611 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:54,611 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:54,613 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:54,613 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:54,617 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:54,625 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:54,632 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:54,640 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:54,640 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:54,641 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:54,649 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:54,650 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:54,674 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:54,687 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:54,688 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:54,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:54,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:54,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:54,723 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 11:56:54,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:55,514 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:55,514 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1407972661] [2021-05-06 11:56:55,514 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1407972661] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:55,514 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:55,514 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2021-05-06 11:56:55,514 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395248357] [2021-05-06 11:56:55,515 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-06 11:56:55,515 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:55,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-06 11:56:55,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=1931, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 11:56:55,515 INFO L87 Difference]: Start difference. First operand 164 states and 167 transitions. Second operand has 43 states, 43 states have (on average 3.6511627906976742) internal successors, (157), 42 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 11:56:58,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:58,882 INFO L93 Difference]: Finished difference Result 177 states and 185 transitions. [2021-05-06 11:56:58,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-06 11:56:58,883 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 3.6511627906976742) internal successors, (157), 42 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 11:56:58,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:58,883 INFO L225 Difference]: With dead ends: 177 [2021-05-06 11:56:58,883 INFO L226 Difference]: Without dead ends: 168 [2021-05-06 11:56:58,884 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 118 SyntacticMatches, 1 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1125 ImplicationChecksByTransitivity, 2050.9ms TimeCoverageRelationStatistics Valid=348, Invalid=6962, Unknown=0, NotChecked=0, Total=7310 [2021-05-06 11:56:58,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-05-06 11:56:58,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2021-05-06 11:56:58,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 163 states have (on average 1.0245398773006136) internal successors, (167), 163 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 11:56:58,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 171 transitions. [2021-05-06 11:56:58,891 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 171 transitions. Word has length 161 [2021-05-06 11:56:58,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:58,891 INFO L480 AbstractCegarLoop]: Abstraction has 168 states and 171 transitions. [2021-05-06 11:56:58,891 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 3.6511627906976742) internal successors, (157), 42 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 11:56:58,891 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 171 transitions. [2021-05-06 11:56:58,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2021-05-06 11:56:58,892 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:58,892 INFO L523 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:58,892 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable111 [2021-05-06 11:56:58,892 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:58,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:58,892 INFO L82 PathProgramCache]: Analyzing trace with hash 1711773873, now seen corresponding path program 38 times [2021-05-06 11:56:58,892 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:58,893 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1086350919] [2021-05-06 11:56:58,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:58,898 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:56:58,911 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:58,912 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:58,920 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:58,921 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:58,930 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:56:58,943 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:58,945 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:58,952 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:58,956 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:58,961 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:58,969 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:58,970 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:58,971 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:58,972 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:58,976 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:58,985 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:58,993 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:58,996 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:59,010 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:59,011 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:59,019 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:59,021 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:59,029 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:59,042 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 11:56:59,043 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:59,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:59,086 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:59,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:59,094 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 11:56:59,095 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:59,953 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:59,953 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1086350919] [2021-05-06 11:56:59,953 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1086350919] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:59,953 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:59,953 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-06 11:56:59,953 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510643372] [2021-05-06 11:56:59,954 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 11:56:59,954 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:59,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 11:56:59,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=1982, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 11:56:59,954 INFO L87 Difference]: Start difference. First operand 168 states and 171 transitions. Second operand has 44 states, 44 states have (on average 3.659090909090909) internal successors, (161), 43 states have internal predecessors, (161), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:03,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:03,534 INFO L93 Difference]: Finished difference Result 181 states and 189 transitions. [2021-05-06 11:57:03,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-06 11:57:03,534 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 3.659090909090909) internal successors, (161), 43 states have internal predecessors, (161), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 165 [2021-05-06 11:57:03,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:03,535 INFO L225 Difference]: With dead ends: 181 [2021-05-06 11:57:03,535 INFO L226 Difference]: Without dead ends: 172 [2021-05-06 11:57:03,536 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 120 SyntacticMatches, 1 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1136 ImplicationChecksByTransitivity, 2161.8ms TimeCoverageRelationStatistics Valid=432, Invalid=7224, Unknown=0, NotChecked=0, Total=7656 [2021-05-06 11:57:03,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-05-06 11:57:03,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 172. [2021-05-06 11:57:03,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 167 states have (on average 1.0239520958083832) internal successors, (171), 167 states have internal predecessors, (171), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:03,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 175 transitions. [2021-05-06 11:57:03,544 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 175 transitions. Word has length 165 [2021-05-06 11:57:03,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:03,544 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 175 transitions. [2021-05-06 11:57:03,544 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 3.659090909090909) internal successors, (161), 43 states have internal predecessors, (161), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:03,544 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 175 transitions. [2021-05-06 11:57:03,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2021-05-06 11:57:03,545 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:03,545 INFO L523 BasicCegarLoop]: trace histogram [40, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:03,545 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable114 [2021-05-06 11:57:03,545 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:03,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:03,545 INFO L82 PathProgramCache]: Analyzing trace with hash -546660728, now seen corresponding path program 39 times [2021-05-06 11:57:03,545 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:03,545 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [959996920] [2021-05-06 11:57:03,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:03,551 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:57:03,563 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:03,565 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:03,572 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:03,573 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:03,581 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:57:03,594 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:03,596 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:03,602 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:03,605 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:03,608 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:03,615 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:03,615 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:03,617 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:03,617 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:03,621 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:03,629 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:03,635 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:03,638 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:03,639 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:03,640 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:03,647 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:03,649 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:03,666 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:03,678 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:03,680 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:03,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:03,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:03,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:03,715 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:03,716 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:04,577 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:04,577 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [959996920] [2021-05-06 11:57:04,577 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [959996920] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:04,578 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:04,578 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2021-05-06 11:57:04,578 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1303691659] [2021-05-06 11:57:04,578 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-06 11:57:04,578 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:04,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-06 11:57:04,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=2111, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 11:57:04,579 INFO L87 Difference]: Start difference. First operand 172 states and 175 transitions. Second operand has 45 states, 45 states have (on average 3.6666666666666665) internal successors, (165), 44 states have internal predecessors, (165), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:08,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:08,238 INFO L93 Difference]: Finished difference Result 185 states and 193 transitions. [2021-05-06 11:57:08,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-06 11:57:08,238 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 3.6666666666666665) internal successors, (165), 44 states have internal predecessors, (165), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 169 [2021-05-06 11:57:08,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:08,239 INFO L225 Difference]: With dead ends: 185 [2021-05-06 11:57:08,239 INFO L226 Difference]: Without dead ends: 176 [2021-05-06 11:57:08,239 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 123 SyntacticMatches, 1 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1224 ImplicationChecksByTransitivity, 2213.3ms TimeCoverageRelationStatistics Valid=364, Invalid=7646, Unknown=0, NotChecked=0, Total=8010 [2021-05-06 11:57:08,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2021-05-06 11:57:08,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 176. [2021-05-06 11:57:08,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 171 states have (on average 1.023391812865497) internal successors, (175), 171 states have internal predecessors, (175), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:08,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 179 transitions. [2021-05-06 11:57:08,247 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 179 transitions. Word has length 169 [2021-05-06 11:57:08,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:08,247 INFO L480 AbstractCegarLoop]: Abstraction has 176 states and 179 transitions. [2021-05-06 11:57:08,247 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 3.6666666666666665) internal successors, (165), 44 states have internal predecessors, (165), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:08,247 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 179 transitions. [2021-05-06 11:57:08,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-05-06 11:57:08,248 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:08,248 INFO L523 BasicCegarLoop]: trace histogram [41, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:08,248 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable117 [2021-05-06 11:57:08,248 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:08,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:08,248 INFO L82 PathProgramCache]: Analyzing trace with hash 1100538079, now seen corresponding path program 40 times [2021-05-06 11:57:08,248 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:08,248 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1343943159] [2021-05-06 11:57:08,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:08,254 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:57:08,267 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:08,268 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:08,275 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:08,277 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:08,284 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:57:08,297 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:08,299 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:08,305 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:08,308 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:08,312 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:08,319 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:08,319 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:08,320 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:08,326 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:08,330 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:08,334 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:08,340 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:08,343 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:08,356 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:08,357 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:08,364 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:08,366 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:08,374 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:08,387 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:08,387 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:08,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:08,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:08,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:08,418 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 11:57:08,419 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:09,326 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:09,327 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1343943159] [2021-05-06 11:57:09,327 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1343943159] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:09,327 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:09,327 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2021-05-06 11:57:09,327 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [772371220] [2021-05-06 11:57:09,327 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-06 11:57:09,327 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:09,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-06 11:57:09,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=2204, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 11:57:09,328 INFO L87 Difference]: Start difference. First operand 176 states and 179 transitions. Second operand has 46 states, 46 states have (on average 3.6739130434782608) internal successors, (169), 45 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 11:57:13,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:13,173 INFO L93 Difference]: Finished difference Result 189 states and 197 transitions. [2021-05-06 11:57:13,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-06 11:57:13,173 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 3.6739130434782608) internal successors, (169), 45 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 11:57:13,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:13,174 INFO L225 Difference]: With dead ends: 189 [2021-05-06 11:57:13,174 INFO L226 Difference]: Without dead ends: 180 [2021-05-06 11:57:13,174 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 126 SyntacticMatches, 1 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1275 ImplicationChecksByTransitivity, 2317.1ms TimeCoverageRelationStatistics Valid=372, Invalid=8000, Unknown=0, NotChecked=0, Total=8372 [2021-05-06 11:57:13,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-05-06 11:57:13,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 180. [2021-05-06 11:57:13,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 175 states have (on average 1.022857142857143) internal successors, (179), 175 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 11:57:13,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 183 transitions. [2021-05-06 11:57:13,182 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 183 transitions. Word has length 173 [2021-05-06 11:57:13,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:13,182 INFO L480 AbstractCegarLoop]: Abstraction has 180 states and 183 transitions. [2021-05-06 11:57:13,182 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 3.6739130434782608) internal successors, (169), 45 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 11:57:13,182 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 183 transitions. [2021-05-06 11:57:13,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2021-05-06 11:57:13,183 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:13,183 INFO L523 BasicCegarLoop]: trace histogram [42, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:13,183 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable120 [2021-05-06 11:57:13,183 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:13,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:13,183 INFO L82 PathProgramCache]: Analyzing trace with hash -2086658122, now seen corresponding path program 41 times [2021-05-06 11:57:13,184 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:13,184 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1475001933] [2021-05-06 11:57:13,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:13,190 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:57:13,190 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:13,191 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:13,198 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:13,200 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:13,218 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:57:13,231 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 11:57:13,233 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:13,233 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:13,237 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:13,246 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:13,252 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:13,253 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:13,254 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:13,260 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:13,263 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:13,267 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:13,274 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:13,277 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:13,277 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:13,278 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:13,285 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:13,287 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:13,305 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:13,319 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:13,320 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:13,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:13,347 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:13,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:13,350 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:13,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:14,309 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:14,310 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1475001933] [2021-05-06 11:57:14,310 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1475001933] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:14,310 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:14,310 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2021-05-06 11:57:14,310 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139463182] [2021-05-06 11:57:14,310 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-06 11:57:14,310 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:14,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-06 11:57:14,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=2299, Unknown=0, NotChecked=0, Total=2450 [2021-05-06 11:57:14,311 INFO L87 Difference]: Start difference. First operand 180 states and 183 transitions. Second operand has 47 states, 47 states have (on average 3.6808510638297873) internal successors, (173), 46 states have internal predecessors, (173), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:18,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:18,341 INFO L93 Difference]: Finished difference Result 193 states and 201 transitions. [2021-05-06 11:57:18,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-06 11:57:18,341 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 3.6808510638297873) internal successors, (173), 46 states have internal predecessors, (173), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 177 [2021-05-06 11:57:18,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:18,342 INFO L225 Difference]: With dead ends: 193 [2021-05-06 11:57:18,342 INFO L226 Difference]: Without dead ends: 184 [2021-05-06 11:57:18,342 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 129 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1327 ImplicationChecksByTransitivity, 2417.1ms TimeCoverageRelationStatistics Valid=380, Invalid=8362, Unknown=0, NotChecked=0, Total=8742 [2021-05-06 11:57:18,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2021-05-06 11:57:18,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 184. [2021-05-06 11:57:18,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 179 states have (on average 1.0223463687150838) internal successors, (183), 179 states have internal predecessors, (183), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:18,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 187 transitions. [2021-05-06 11:57:18,350 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 187 transitions. Word has length 177 [2021-05-06 11:57:18,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:18,350 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 187 transitions. [2021-05-06 11:57:18,350 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 3.6808510638297873) internal successors, (173), 46 states have internal predecessors, (173), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:18,350 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 187 transitions. [2021-05-06 11:57:18,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2021-05-06 11:57:18,351 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:18,351 INFO L523 BasicCegarLoop]: trace histogram [43, 42, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:18,351 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable123 [2021-05-06 11:57:18,351 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:18,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:18,351 INFO L82 PathProgramCache]: Analyzing trace with hash -542237939, now seen corresponding path program 42 times [2021-05-06 11:57:18,352 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:18,352 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1572434298] [2021-05-06 11:57:18,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:18,359 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:57:18,371 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:18,373 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:18,380 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:18,382 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:18,390 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:57:18,404 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:18,406 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:18,411 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:18,414 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:18,418 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:18,425 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:18,425 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:18,427 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:18,432 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:18,435 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:18,439 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:18,445 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:18,448 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:18,461 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:18,462 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:18,469 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:18,470 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:18,478 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:18,491 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 11:57:18,492 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:18,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:18,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:18,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:18,523 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:18,524 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:19,525 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:19,525 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1572434298] [2021-05-06 11:57:19,525 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1572434298] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:19,525 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:19,525 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2021-05-06 11:57:19,525 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984205901] [2021-05-06 11:57:19,525 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-06 11:57:19,525 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:19,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-06 11:57:19,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=2354, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 11:57:19,526 INFO L87 Difference]: Start difference. First operand 184 states and 187 transitions. Second operand has 48 states, 48 states have (on average 3.6875) internal successors, (177), 47 states have internal predecessors, (177), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:23,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:23,728 INFO L93 Difference]: Finished difference Result 197 states and 205 transitions. [2021-05-06 11:57:23,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-06 11:57:23,729 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 3.6875) internal successors, (177), 47 states have internal predecessors, (177), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 181 [2021-05-06 11:57:23,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:23,729 INFO L225 Difference]: With dead ends: 197 [2021-05-06 11:57:23,730 INFO L226 Difference]: Without dead ends: 188 [2021-05-06 11:57:23,730 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 132 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1338 ImplicationChecksByTransitivity, 2516.9ms TimeCoverageRelationStatistics Valid=472, Invalid=8648, Unknown=0, NotChecked=0, Total=9120 [2021-05-06 11:57:23,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-05-06 11:57:23,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 188. [2021-05-06 11:57:23,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 188 states, 183 states have (on average 1.0218579234972678) internal successors, (187), 183 states have internal predecessors, (187), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:23,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 191 transitions. [2021-05-06 11:57:23,738 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 191 transitions. Word has length 181 [2021-05-06 11:57:23,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:23,738 INFO L480 AbstractCegarLoop]: Abstraction has 188 states and 191 transitions. [2021-05-06 11:57:23,738 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 3.6875) internal successors, (177), 47 states have internal predecessors, (177), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:23,738 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 191 transitions. [2021-05-06 11:57:23,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2021-05-06 11:57:23,739 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:23,739 INFO L523 BasicCegarLoop]: trace histogram [44, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:23,739 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable126 [2021-05-06 11:57:23,739 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:23,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:23,739 INFO L82 PathProgramCache]: Analyzing trace with hash 1125159652, now seen corresponding path program 43 times [2021-05-06 11:57:23,739 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:23,739 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1971681643] [2021-05-06 11:57:23,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:23,748 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:57:23,749 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:23,750 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:23,758 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:23,759 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:23,777 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:57:23,790 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 11:57:23,792 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:23,798 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:23,801 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:23,805 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:23,811 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:23,812 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:23,813 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:23,814 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:23,817 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:23,825 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:23,832 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:23,838 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:23,851 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:23,852 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:23,863 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:23,865 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:23,872 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:23,886 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:23,886 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:23,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:23,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:23,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:23,923 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:23,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:24,953 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:24,954 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1971681643] [2021-05-06 11:57:24,954 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1971681643] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:24,954 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:24,954 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2021-05-06 11:57:24,954 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448433312] [2021-05-06 11:57:24,954 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-06 11:57:24,954 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:24,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-06 11:57:24,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2452, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 11:57:24,955 INFO L87 Difference]: Start difference. First operand 188 states and 191 transitions. Second operand has 49 states, 49 states have (on average 3.693877551020408) internal successors, (181), 48 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 11:57:29,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:29,368 INFO L93 Difference]: Finished difference Result 201 states and 209 transitions. [2021-05-06 11:57:29,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-06 11:57:29,369 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.693877551020408) internal successors, (181), 48 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 11:57:29,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:29,370 INFO L225 Difference]: With dead ends: 201 [2021-05-06 11:57:29,370 INFO L226 Difference]: Without dead ends: 192 [2021-05-06 11:57:29,370 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 135 SyntacticMatches, 1 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1391 ImplicationChecksByTransitivity, 2625.9ms TimeCoverageRelationStatistics Valid=482, Invalid=9024, Unknown=0, NotChecked=0, Total=9506 [2021-05-06 11:57:29,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2021-05-06 11:57:29,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 192. [2021-05-06 11:57:29,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 187 states have (on average 1.0213903743315509) internal successors, (191), 187 states have internal predecessors, (191), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:29,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 195 transitions. [2021-05-06 11:57:29,378 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 195 transitions. Word has length 185 [2021-05-06 11:57:29,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:29,379 INFO L480 AbstractCegarLoop]: Abstraction has 192 states and 195 transitions. [2021-05-06 11:57:29,379 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 3.693877551020408) internal successors, (181), 48 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 11:57:29,379 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 195 transitions. [2021-05-06 11:57:29,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2021-05-06 11:57:29,379 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:29,379 INFO L523 BasicCegarLoop]: trace histogram [45, 44, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:29,379 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable129 [2021-05-06 11:57:29,379 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:29,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:29,380 INFO L82 PathProgramCache]: Analyzing trace with hash -1103804613, now seen corresponding path program 44 times [2021-05-06 11:57:29,380 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:29,380 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [635924171] [2021-05-06 11:57:29,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:29,388 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:57:29,389 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:29,390 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:29,398 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:29,400 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:29,418 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:57:29,432 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:29,434 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:29,434 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:29,438 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:29,447 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:29,454 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:29,454 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:29,456 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:29,466 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:29,470 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:29,474 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:29,480 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:29,483 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:29,495 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:29,496 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:29,505 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:29,507 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:29,515 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:29,528 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:29,529 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:29,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:29,561 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:29,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:29,563 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:29,564 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:30,636 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:30,636 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [635924171] [2021-05-06 11:57:30,636 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [635924171] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:30,636 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:30,636 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2021-05-06 11:57:30,636 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023156986] [2021-05-06 11:57:30,637 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-06 11:57:30,637 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:30,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-06 11:57:30,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=2596, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 11:57:30,637 INFO L87 Difference]: Start difference. First operand 192 states and 195 transitions. Second operand has 50 states, 50 states have (on average 3.7) internal successors, (185), 49 states have internal predecessors, (185), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:35,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:35,155 INFO L93 Difference]: Finished difference Result 205 states and 213 transitions. [2021-05-06 11:57:35,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-06 11:57:35,156 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 3.7) internal successors, (185), 49 states have internal predecessors, (185), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 189 [2021-05-06 11:57:35,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:35,156 INFO L225 Difference]: With dead ends: 205 [2021-05-06 11:57:35,157 INFO L226 Difference]: Without dead ends: 196 [2021-05-06 11:57:35,157 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 138 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1489 ImplicationChecksByTransitivity, 2683.5ms TimeCoverageRelationStatistics Valid=404, Invalid=9496, Unknown=0, NotChecked=0, Total=9900 [2021-05-06 11:57:35,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-05-06 11:57:35,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2021-05-06 11:57:35,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 191 states have (on average 1.0209424083769634) internal successors, (195), 191 states have internal predecessors, (195), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:35,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 199 transitions. [2021-05-06 11:57:35,165 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 199 transitions. Word has length 189 [2021-05-06 11:57:35,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:35,165 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 199 transitions. [2021-05-06 11:57:35,165 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 3.7) internal successors, (185), 49 states have internal predecessors, (185), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:35,165 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 199 transitions. [2021-05-06 11:57:35,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2021-05-06 11:57:35,166 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:35,166 INFO L523 BasicCegarLoop]: trace histogram [46, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:35,166 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable132 [2021-05-06 11:57:35,166 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:35,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:35,166 INFO L82 PathProgramCache]: Analyzing trace with hash -190187502, now seen corresponding path program 45 times [2021-05-06 11:57:35,166 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:35,167 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1715984649] [2021-05-06 11:57:35,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:35,177 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:57:35,177 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:35,178 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:35,186 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:35,188 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:35,205 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:57:35,219 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:35,221 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:35,226 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:35,229 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:35,233 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:35,240 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:35,241 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:35,243 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:35,248 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:35,252 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:35,255 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:35,262 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:35,265 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:35,277 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:35,278 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:35,286 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:35,287 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:35,296 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:35,309 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:35,310 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:35,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:35,341 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:35,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:35,344 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 11:57:35,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:36,435 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:36,435 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1715984649] [2021-05-06 11:57:36,435 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1715984649] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:36,435 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:36,436 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2021-05-06 11:57:36,436 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790756354] [2021-05-06 11:57:36,436 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-06 11:57:36,436 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:36,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-06 11:57:36,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=2654, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 11:57:36,436 INFO L87 Difference]: Start difference. First operand 196 states and 199 transitions. Second operand has 51 states, 51 states have (on average 3.7058823529411766) internal successors, (189), 50 states have internal predecessors, (189), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:41,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:41,220 INFO L93 Difference]: Finished difference Result 209 states and 217 transitions. [2021-05-06 11:57:41,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-06 11:57:41,221 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 3.7058823529411766) internal successors, (189), 50 states have internal predecessors, (189), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 193 [2021-05-06 11:57:41,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:41,221 INFO L225 Difference]: With dead ends: 209 [2021-05-06 11:57:41,221 INFO L226 Difference]: Without dead ends: 200 [2021-05-06 11:57:41,222 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 141 SyntacticMatches, 1 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1500 ImplicationChecksByTransitivity, 2784.9ms TimeCoverageRelationStatistics Valid=502, Invalid=9800, Unknown=0, NotChecked=0, Total=10302 [2021-05-06 11:57:41,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-05-06 11:57:41,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 200. [2021-05-06 11:57:41,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 195 states have (on average 1.0205128205128204) internal successors, (199), 195 states have internal predecessors, (199), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:41,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 203 transitions. [2021-05-06 11:57:41,230 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 203 transitions. Word has length 193 [2021-05-06 11:57:41,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:41,230 INFO L480 AbstractCegarLoop]: Abstraction has 200 states and 203 transitions. [2021-05-06 11:57:41,230 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 3.7058823529411766) internal successors, (189), 50 states have internal predecessors, (189), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:41,230 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 203 transitions. [2021-05-06 11:57:41,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2021-05-06 11:57:41,231 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:41,231 INFO L523 BasicCegarLoop]: trace histogram [47, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:41,231 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable135 [2021-05-06 11:57:41,231 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:41,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:41,232 INFO L82 PathProgramCache]: Analyzing trace with hash -1927518871, now seen corresponding path program 46 times [2021-05-06 11:57:41,232 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:41,232 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [398868823] [2021-05-06 11:57:41,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:41,237 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:57:41,250 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:41,251 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:41,259 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:41,260 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:41,268 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:57:41,281 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 11:57:41,284 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:41,284 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:41,288 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:41,296 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:41,303 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:41,304 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:41,305 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:41,305 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:41,309 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:41,317 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:41,324 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:41,332 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:41,347 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:41,349 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:41,357 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:41,359 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:41,369 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:41,385 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:41,386 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:41,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:41,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:41,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:41,426 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:41,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:42,588 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:42,588 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [398868823] [2021-05-06 11:57:42,588 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [398868823] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:42,588 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:42,588 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2021-05-06 11:57:42,588 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089142113] [2021-05-06 11:57:42,588 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-06 11:57:42,588 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:42,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-06 11:57:42,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=2804, Unknown=0, NotChecked=0, Total=2970 [2021-05-06 11:57:42,589 INFO L87 Difference]: Start difference. First operand 200 states and 203 transitions. Second operand has 52 states, 52 states have (on average 3.7115384615384617) internal successors, (193), 51 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 11:57:47,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:47,524 INFO L93 Difference]: Finished difference Result 213 states and 221 transitions. [2021-05-06 11:57:47,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-06 11:57:47,524 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 3.7115384615384617) internal successors, (193), 51 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 11:57:47,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:47,525 INFO L225 Difference]: With dead ends: 213 [2021-05-06 11:57:47,525 INFO L226 Difference]: Without dead ends: 204 [2021-05-06 11:57:47,526 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 144 SyntacticMatches, 1 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1602 ImplicationChecksByTransitivity, 2903.9ms TimeCoverageRelationStatistics Valid=420, Invalid=10292, Unknown=0, NotChecked=0, Total=10712 [2021-05-06 11:57:47,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2021-05-06 11:57:47,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 204. [2021-05-06 11:57:47,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 199 states have (on average 1.020100502512563) internal successors, (203), 199 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 11:57:47,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 207 transitions. [2021-05-06 11:57:47,534 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 207 transitions. Word has length 197 [2021-05-06 11:57:47,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:47,534 INFO L480 AbstractCegarLoop]: Abstraction has 204 states and 207 transitions. [2021-05-06 11:57:47,534 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 3.7115384615384617) internal successors, (193), 51 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 11:57:47,534 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 207 transitions. [2021-05-06 11:57:47,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2021-05-06 11:57:47,535 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:47,535 INFO L523 BasicCegarLoop]: trace histogram [48, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:47,535 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable138 [2021-05-06 11:57:47,535 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:47,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:47,536 INFO L82 PathProgramCache]: Analyzing trace with hash -1587916992, now seen corresponding path program 47 times [2021-05-06 11:57:47,536 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:47,536 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1486489532] [2021-05-06 11:57:47,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:47,541 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:57:47,553 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:47,554 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:47,561 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:47,563 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:47,574 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:57:47,586 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 11:57:47,588 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:47,588 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:47,592 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:47,600 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:47,607 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:47,608 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:47,609 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:47,609 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:47,613 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:47,621 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:47,628 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:47,630 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:47,631 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:47,632 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:47,639 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:47,641 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:47,659 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:47,673 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:47,673 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:47,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:47,706 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:47,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:47,709 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:47,710 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:48,907 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:48,907 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1486489532] [2021-05-06 11:57:48,907 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1486489532] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:48,907 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:48,908 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2021-05-06 11:57:48,908 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463960787] [2021-05-06 11:57:48,908 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-06 11:57:48,908 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:48,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-06 11:57:48,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=2911, Unknown=0, NotChecked=0, Total=3080 [2021-05-06 11:57:48,908 INFO L87 Difference]: Start difference. First operand 204 states and 207 transitions. Second operand has 53 states, 53 states have (on average 3.7169811320754715) internal successors, (197), 52 states have internal predecessors, (197), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:54,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:54,046 INFO L93 Difference]: Finished difference Result 217 states and 225 transitions. [2021-05-06 11:57:54,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-06 11:57:54,047 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 3.7169811320754715) internal successors, (197), 52 states have internal predecessors, (197), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 201 [2021-05-06 11:57:54,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:54,047 INFO L225 Difference]: With dead ends: 217 [2021-05-06 11:57:54,047 INFO L226 Difference]: Without dead ends: 208 [2021-05-06 11:57:54,048 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 147 SyntacticMatches, 1 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1660 ImplicationChecksByTransitivity, 3008.2ms TimeCoverageRelationStatistics Valid=428, Invalid=10702, Unknown=0, NotChecked=0, Total=11130 [2021-05-06 11:57:54,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-05-06 11:57:54,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 208. [2021-05-06 11:57:54,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 203 states have (on average 1.019704433497537) internal successors, (207), 203 states have internal predecessors, (207), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:54,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 211 transitions. [2021-05-06 11:57:54,057 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 211 transitions. Word has length 201 [2021-05-06 11:57:54,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:54,057 INFO L480 AbstractCegarLoop]: Abstraction has 208 states and 211 transitions. [2021-05-06 11:57:54,057 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 3.7169811320754715) internal successors, (197), 52 states have internal predecessors, (197), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:54,057 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 211 transitions. [2021-05-06 11:57:54,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2021-05-06 11:57:54,058 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:54,058 INFO L523 BasicCegarLoop]: trace histogram [49, 48, 48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:54,058 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable141 [2021-05-06 11:57:54,058 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:54,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:54,058 INFO L82 PathProgramCache]: Analyzing trace with hash 777090455, now seen corresponding path program 48 times [2021-05-06 11:57:54,058 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:54,058 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2026147118] [2021-05-06 11:57:54,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:54,064 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:57:54,077 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:54,078 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:54,085 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:54,087 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:54,094 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:57:54,106 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:54,108 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:54,114 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:54,117 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:54,121 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:54,127 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:54,128 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:54,129 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:54,134 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:54,138 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:54,142 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:54,148 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:54,151 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:54,164 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:54,165 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:54,172 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:54,174 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:54,182 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:54,196 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:54,197 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:54,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:54,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:54,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:54,237 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:54,239 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:55,482 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:55,483 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2026147118] [2021-05-06 11:57:55,483 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2026147118] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:55,483 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:55,483 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2021-05-06 11:57:55,483 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625151081] [2021-05-06 11:57:55,483 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-06 11:57:55,483 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:55,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-06 11:57:55,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=2972, Unknown=0, NotChecked=0, Total=3192 [2021-05-06 11:57:55,484 INFO L87 Difference]: Start difference. First operand 208 states and 211 transitions. Second operand has 54 states, 54 states have (on average 3.7222222222222223) internal successors, (201), 53 states have internal predecessors, (201), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:00,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:00,775 INFO L93 Difference]: Finished difference Result 221 states and 229 transitions. [2021-05-06 11:58:00,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-06 11:58:00,776 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 3.7222222222222223) internal successors, (201), 53 states have internal predecessors, (201), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 205 [2021-05-06 11:58:00,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:00,777 INFO L225 Difference]: With dead ends: 221 [2021-05-06 11:58:00,777 INFO L226 Difference]: Without dead ends: 212 [2021-05-06 11:58:00,777 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 150 SyntacticMatches, 1 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1671 ImplicationChecksByTransitivity, 3107.2ms TimeCoverageRelationStatistics Valid=532, Invalid=11024, Unknown=0, NotChecked=0, Total=11556 [2021-05-06 11:58:00,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-05-06 11:58:00,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 212. [2021-05-06 11:58:00,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 207 states have (on average 1.0193236714975846) internal successors, (211), 207 states have internal predecessors, (211), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:00,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 215 transitions. [2021-05-06 11:58:00,792 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 215 transitions. Word has length 205 [2021-05-06 11:58:00,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:00,792 INFO L480 AbstractCegarLoop]: Abstraction has 212 states and 215 transitions. [2021-05-06 11:58:00,792 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 3.7222222222222223) internal successors, (201), 53 states have internal predecessors, (201), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:00,792 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 215 transitions. [2021-05-06 11:58:00,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2021-05-06 11:58:00,793 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:00,793 INFO L523 BasicCegarLoop]: trace histogram [50, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:00,793 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable144 [2021-05-06 11:58:00,793 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:00,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:00,793 INFO L82 PathProgramCache]: Analyzing trace with hash -2079352722, now seen corresponding path program 49 times [2021-05-06 11:58:00,793 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:00,793 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1072981057] [2021-05-06 11:58:00,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:00,809 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:58:00,821 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:00,823 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:00,829 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:00,830 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:00,838 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:58:00,851 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:00,853 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:00,854 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:00,857 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:00,866 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:00,873 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:00,877 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:00,878 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:00,879 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:00,882 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:00,891 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:00,897 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:00,900 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:00,913 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:00,914 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:00,920 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:00,922 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:00,930 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:00,945 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 11:58:00,946 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:00,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:00,979 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:00,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:00,981 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:58:00,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:02,242 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:02,242 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1072981057] [2021-05-06 11:58:02,242 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1072981057] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:02,242 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:02,243 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [55] imperfect sequences [] total 55 [2021-05-06 11:58:02,243 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983956355] [2021-05-06 11:58:02,243 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-06 11:58:02,243 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:02,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-06 11:58:02,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=3082, Unknown=0, NotChecked=0, Total=3306 [2021-05-06 11:58:02,243 INFO L87 Difference]: Start difference. First operand 212 states and 215 transitions. Second operand has 55 states, 55 states have (on average 3.727272727272727) internal successors, (205), 54 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 11:58:07,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:07,764 INFO L93 Difference]: Finished difference Result 225 states and 233 transitions. [2021-05-06 11:58:07,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-06 11:58:07,765 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.727272727272727) internal successors, (205), 54 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 11:58:07,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:07,765 INFO L225 Difference]: With dead ends: 225 [2021-05-06 11:58:07,765 INFO L226 Difference]: Without dead ends: 216 [2021-05-06 11:58:07,766 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 153 SyntacticMatches, 1 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1730 ImplicationChecksByTransitivity, 3193.5ms TimeCoverageRelationStatistics Valid=542, Invalid=11448, Unknown=0, NotChecked=0, Total=11990 [2021-05-06 11:58:07,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2021-05-06 11:58:07,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 216. [2021-05-06 11:58:07,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 211 states have (on average 1.018957345971564) internal successors, (215), 211 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 11:58:07,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 219 transitions. [2021-05-06 11:58:07,775 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 219 transitions. Word has length 209 [2021-05-06 11:58:07,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:07,775 INFO L480 AbstractCegarLoop]: Abstraction has 216 states and 219 transitions. [2021-05-06 11:58:07,775 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 3.727272727272727) internal successors, (205), 54 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 11:58:07,775 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 219 transitions. [2021-05-06 11:58:07,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2021-05-06 11:58:07,776 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:07,776 INFO L523 BasicCegarLoop]: trace histogram [51, 50, 50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:07,776 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable147 [2021-05-06 11:58:07,776 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:07,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:07,776 INFO L82 PathProgramCache]: Analyzing trace with hash -1245546555, now seen corresponding path program 50 times [2021-05-06 11:58:07,776 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:07,776 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2102394894] [2021-05-06 11:58:07,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:07,782 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:58:07,795 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:07,796 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:07,803 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:07,805 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:07,813 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:58:07,825 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 11:58:07,828 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:07,828 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:07,831 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:07,840 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:07,847 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:07,847 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:07,849 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:07,854 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:07,857 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:07,861 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:07,868 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:07,870 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:07,871 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:07,872 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:07,880 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:07,881 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:07,899 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:07,912 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 11:58:07,913 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:07,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:07,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:07,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:07,959 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:58:07,960 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:09,301 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:09,301 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2102394894] [2021-05-06 11:58:09,301 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2102394894] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:09,301 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:09,301 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [56] imperfect sequences [] total 56 [2021-05-06 11:58:09,301 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1857442879] [2021-05-06 11:58:09,301 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-06 11:58:09,301 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:09,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-06 11:58:09,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=3244, Unknown=0, NotChecked=0, Total=3422 [2021-05-06 11:58:09,302 INFO L87 Difference]: Start difference. First operand 216 states and 219 transitions. Second operand has 56 states, 56 states have (on average 3.732142857142857) internal successors, (209), 55 states have internal predecessors, (209), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:14,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:14,994 INFO L93 Difference]: Finished difference Result 229 states and 237 transitions. [2021-05-06 11:58:14,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-06 11:58:14,994 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 3.732142857142857) internal successors, (209), 55 states have internal predecessors, (209), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 213 [2021-05-06 11:58:14,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:14,995 INFO L225 Difference]: With dead ends: 229 [2021-05-06 11:58:14,995 INFO L226 Difference]: Without dead ends: 220 [2021-05-06 11:58:14,995 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 156 SyntacticMatches, 1 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1840 ImplicationChecksByTransitivity, 3317.5ms TimeCoverageRelationStatistics Valid=452, Invalid=11980, Unknown=0, NotChecked=0, Total=12432 [2021-05-06 11:58:14,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2021-05-06 11:58:15,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 220. [2021-05-06 11:58:15,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 215 states have (on average 1.0186046511627906) internal successors, (219), 215 states have internal predecessors, (219), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:15,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 223 transitions. [2021-05-06 11:58:15,005 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 223 transitions. Word has length 213 [2021-05-06 11:58:15,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:15,005 INFO L480 AbstractCegarLoop]: Abstraction has 220 states and 223 transitions. [2021-05-06 11:58:15,005 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 56 states have (on average 3.732142857142857) internal successors, (209), 55 states have internal predecessors, (209), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:15,005 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 223 transitions. [2021-05-06 11:58:15,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 218 [2021-05-06 11:58:15,006 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:15,006 INFO L523 BasicCegarLoop]: trace histogram [52, 51, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:15,006 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable150 [2021-05-06 11:58:15,006 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:15,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:15,006 INFO L82 PathProgramCache]: Analyzing trace with hash 163042204, now seen corresponding path program 51 times [2021-05-06 11:58:15,006 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:15,006 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1601586266] [2021-05-06 11:58:15,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:15,012 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:58:15,013 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:15,016 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:15,023 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:15,025 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:15,043 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:58:15,056 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:15,065 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:15,065 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:15,069 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:15,077 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:15,084 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:15,084 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:15,086 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:15,086 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:15,089 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:15,098 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:15,105 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:15,107 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:15,108 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:15,109 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:15,115 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:15,117 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:15,135 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:15,148 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 11:58:15,150 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:15,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:15,178 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:15,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:15,180 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:58:15,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:16,526 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:16,527 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1601586266] [2021-05-06 11:58:16,527 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1601586266] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:16,527 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:16,527 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2021-05-06 11:58:16,527 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665315337] [2021-05-06 11:58:16,527 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-06 11:58:16,527 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:16,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-06 11:58:16,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=3359, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 11:58:16,528 INFO L87 Difference]: Start difference. First operand 220 states and 223 transitions. Second operand has 57 states, 57 states have (on average 3.736842105263158) internal successors, (213), 56 states have internal predecessors, (213), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:22,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:22,455 INFO L93 Difference]: Finished difference Result 233 states and 241 transitions. [2021-05-06 11:58:22,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-06 11:58:22,456 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 3.736842105263158) internal successors, (213), 56 states have internal predecessors, (213), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 217 [2021-05-06 11:58:22,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:22,456 INFO L225 Difference]: With dead ends: 233 [2021-05-06 11:58:22,457 INFO L226 Difference]: Without dead ends: 224 [2021-05-06 11:58:22,457 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 159 SyntacticMatches, 1 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1902 ImplicationChecksByTransitivity, 3402.7ms TimeCoverageRelationStatistics Valid=460, Invalid=12422, Unknown=0, NotChecked=0, Total=12882 [2021-05-06 11:58:22,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2021-05-06 11:58:22,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 224. [2021-05-06 11:58:22,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 219 states have (on average 1.0182648401826484) internal successors, (223), 219 states have internal predecessors, (223), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:22,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 227 transitions. [2021-05-06 11:58:22,467 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 227 transitions. Word has length 217 [2021-05-06 11:58:22,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:22,467 INFO L480 AbstractCegarLoop]: Abstraction has 224 states and 227 transitions. [2021-05-06 11:58:22,467 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 3.736842105263158) internal successors, (213), 56 states have internal predecessors, (213), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:22,467 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 227 transitions. [2021-05-06 11:58:22,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2021-05-06 11:58:22,467 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:22,468 INFO L523 BasicCegarLoop]: trace histogram [53, 52, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:22,468 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable153 [2021-05-06 11:58:22,468 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:22,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:22,468 INFO L82 PathProgramCache]: Analyzing trace with hash 1767730163, now seen corresponding path program 52 times [2021-05-06 11:58:22,468 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:22,468 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1434810585] [2021-05-06 11:58:22,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:22,474 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:58:22,486 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:22,487 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:22,494 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:22,496 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:22,503 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:58:22,516 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:22,519 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:22,524 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:22,528 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:22,532 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:22,538 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:22,539 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:22,541 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:22,541 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:22,544 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:22,553 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:22,559 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:22,562 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:22,563 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:22,564 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:22,571 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:22,572 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:22,593 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:22,609 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 11:58:22,615 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:22,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:22,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:22,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:22,669 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 11:58:22,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:24,098 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:24,098 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1434810585] [2021-05-06 11:58:24,098 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1434810585] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:24,098 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:24,098 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [58] imperfect sequences [] total 58 [2021-05-06 11:58:24,098 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054832004] [2021-05-06 11:58:24,098 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-06 11:58:24,098 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:24,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-06 11:58:24,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=3476, Unknown=0, NotChecked=0, Total=3660 [2021-05-06 11:58:24,099 INFO L87 Difference]: Start difference. First operand 224 states and 227 transitions. Second operand has 58 states, 58 states have (on average 3.7413793103448274) internal successors, (217), 57 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 11:58:30,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:30,243 INFO L93 Difference]: Finished difference Result 237 states and 245 transitions. [2021-05-06 11:58:30,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-06 11:58:30,244 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 3.7413793103448274) internal successors, (217), 57 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 11:58:30,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:30,244 INFO L225 Difference]: With dead ends: 237 [2021-05-06 11:58:30,244 INFO L226 Difference]: Without dead ends: 228 [2021-05-06 11:58:30,245 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 162 SyntacticMatches, 1 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1965 ImplicationChecksByTransitivity, 3580.1ms TimeCoverageRelationStatistics Valid=468, Invalid=12872, Unknown=0, NotChecked=0, Total=13340 [2021-05-06 11:58:30,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2021-05-06 11:58:30,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 228. [2021-05-06 11:58:30,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 223 states have (on average 1.0179372197309418) internal successors, (227), 223 states have internal predecessors, (227), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:30,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 231 transitions. [2021-05-06 11:58:30,254 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 231 transitions. Word has length 221 [2021-05-06 11:58:30,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:30,255 INFO L480 AbstractCegarLoop]: Abstraction has 228 states and 231 transitions. [2021-05-06 11:58:30,255 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 3.7413793103448274) internal successors, (217), 57 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 11:58:30,255 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 231 transitions. [2021-05-06 11:58:30,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2021-05-06 11:58:30,255 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:30,255 INFO L523 BasicCegarLoop]: trace histogram [54, 53, 53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:30,255 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable156 [2021-05-06 11:58:30,256 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:30,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:30,256 INFO L82 PathProgramCache]: Analyzing trace with hash -784269110, now seen corresponding path program 53 times [2021-05-06 11:58:30,256 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:30,256 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1677212518] [2021-05-06 11:58:30,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:30,262 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:58:30,263 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:30,264 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:30,271 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:30,273 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:30,289 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:58:30,303 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:30,305 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:30,310 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:30,314 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:30,317 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:30,324 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:30,325 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:30,326 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:30,327 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:30,330 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:30,339 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:30,346 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:30,348 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:30,361 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:30,363 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:30,370 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:30,372 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:30,388 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:30,403 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 11:58:30,404 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:30,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:30,433 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:30,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:30,439 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:58:30,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:31,892 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:31,892 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1677212518] [2021-05-06 11:58:31,892 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1677212518] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:31,892 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:31,892 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [59] imperfect sequences [] total 59 [2021-05-06 11:58:31,892 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [787519370] [2021-05-06 11:58:31,892 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-06 11:58:31,893 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:31,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-06 11:58:31,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=3595, Unknown=0, NotChecked=0, Total=3782 [2021-05-06 11:58:31,893 INFO L87 Difference]: Start difference. First operand 228 states and 231 transitions. Second operand has 59 states, 59 states have (on average 3.7457627118644066) internal successors, (221), 58 states have internal predecessors, (221), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:38,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:38,295 INFO L93 Difference]: Finished difference Result 241 states and 249 transitions. [2021-05-06 11:58:38,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-06 11:58:38,295 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 3.7457627118644066) internal successors, (221), 58 states have internal predecessors, (221), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 225 [2021-05-06 11:58:38,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:38,296 INFO L225 Difference]: With dead ends: 241 [2021-05-06 11:58:38,296 INFO L226 Difference]: Without dead ends: 232 [2021-05-06 11:58:38,297 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 165 SyntacticMatches, 1 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2029 ImplicationChecksByTransitivity, 3652.2ms TimeCoverageRelationStatistics Valid=476, Invalid=13330, Unknown=0, NotChecked=0, Total=13806 [2021-05-06 11:58:38,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2021-05-06 11:58:38,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 232. [2021-05-06 11:58:38,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 227 states have (on average 1.0176211453744493) internal successors, (231), 227 states have internal predecessors, (231), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:38,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 235 transitions. [2021-05-06 11:58:38,306 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 235 transitions. Word has length 225 [2021-05-06 11:58:38,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:38,306 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 235 transitions. [2021-05-06 11:58:38,307 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 3.7457627118644066) internal successors, (221), 58 states have internal predecessors, (221), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:38,307 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 235 transitions. [2021-05-06 11:58:38,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2021-05-06 11:58:38,307 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:38,307 INFO L523 BasicCegarLoop]: trace histogram [55, 54, 54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:38,307 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable159 [2021-05-06 11:58:38,308 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:38,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:38,308 INFO L82 PathProgramCache]: Analyzing trace with hash -1055895007, now seen corresponding path program 54 times [2021-05-06 11:58:38,308 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:38,308 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1973535011] [2021-05-06 11:58:38,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:38,313 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:58:38,325 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:38,327 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:38,334 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:38,335 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:38,343 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:58:38,357 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:38,359 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:38,365 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:38,369 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:38,374 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:38,382 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:38,383 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:38,385 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:38,391 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:38,394 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:38,399 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:38,407 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:38,409 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:38,410 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:38,411 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:38,424 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:38,426 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:38,444 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:38,458 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:38,458 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:38,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:38,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:38,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:38,489 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:58:38,490 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:39,997 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:39,997 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1973535011] [2021-05-06 11:58:39,997 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1973535011] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:39,997 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:39,997 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [60] imperfect sequences [] total 60 [2021-05-06 11:58:39,997 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544468186] [2021-05-06 11:58:39,997 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-06 11:58:39,998 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:39,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-06 11:58:39,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=3716, Unknown=0, NotChecked=0, Total=3906 [2021-05-06 11:58:39,998 INFO L87 Difference]: Start difference. First operand 232 states and 235 transitions. Second operand has 60 states, 60 states have (on average 3.75) internal successors, (225), 59 states have internal predecessors, (225), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:46,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:46,621 INFO L93 Difference]: Finished difference Result 245 states and 253 transitions. [2021-05-06 11:58:46,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-05-06 11:58:46,621 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 3.75) internal successors, (225), 59 states have internal predecessors, (225), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 229 [2021-05-06 11:58:46,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:46,622 INFO L225 Difference]: With dead ends: 245 [2021-05-06 11:58:46,622 INFO L226 Difference]: Without dead ends: 236 [2021-05-06 11:58:46,623 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 169 SyntacticMatches, 1 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2094 ImplicationChecksByTransitivity, 3779.7ms TimeCoverageRelationStatistics Valid=484, Invalid=13796, Unknown=0, NotChecked=0, Total=14280 [2021-05-06 11:58:46,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2021-05-06 11:58:46,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 236. [2021-05-06 11:58:46,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 236 states, 231 states have (on average 1.0173160173160174) internal successors, (235), 231 states have internal predecessors, (235), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:46,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 239 transitions. [2021-05-06 11:58:46,633 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 239 transitions. Word has length 229 [2021-05-06 11:58:46,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:46,633 INFO L480 AbstractCegarLoop]: Abstraction has 236 states and 239 transitions. [2021-05-06 11:58:46,633 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 60 states have (on average 3.75) internal successors, (225), 59 states have internal predecessors, (225), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:46,633 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 239 transitions. [2021-05-06 11:58:46,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 234 [2021-05-06 11:58:46,634 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:46,634 INFO L523 BasicCegarLoop]: trace histogram [56, 55, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:46,634 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable162 [2021-05-06 11:58:46,634 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:46,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:46,634 INFO L82 PathProgramCache]: Analyzing trace with hash -1416028168, now seen corresponding path program 55 times [2021-05-06 11:58:46,634 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:46,634 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [942981291] [2021-05-06 11:58:46,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:46,641 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:58:46,654 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:46,655 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:46,662 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:46,663 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:46,671 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:58:46,685 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:46,687 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:46,692 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:46,696 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:46,699 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:46,706 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:46,706 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:46,708 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:46,713 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:46,716 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:46,720 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:46,727 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:46,737 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:46,738 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:46,739 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:46,745 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:46,747 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:46,765 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:46,778 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:46,779 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:46,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:46,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:46,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:46,821 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:58:46,822 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:48,366 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:48,367 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [942981291] [2021-05-06 11:58:48,367 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [942981291] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:48,367 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:48,367 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [61] imperfect sequences [] total 61 [2021-05-06 11:58:48,367 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003575055] [2021-05-06 11:58:48,367 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2021-05-06 11:58:48,367 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:48,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-05-06 11:58:48,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=3839, Unknown=0, NotChecked=0, Total=4032 [2021-05-06 11:58:48,368 INFO L87 Difference]: Start difference. First operand 236 states and 239 transitions. Second operand has 61 states, 61 states have (on average 3.7540983606557377) internal successors, (229), 60 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 11:58:55,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:55,063 INFO L93 Difference]: Finished difference Result 249 states and 257 transitions. [2021-05-06 11:58:55,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-06 11:58:55,064 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 3.7540983606557377) internal successors, (229), 60 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 11:58:55,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:55,064 INFO L225 Difference]: With dead ends: 249 [2021-05-06 11:58:55,064 INFO L226 Difference]: Without dead ends: 240 [2021-05-06 11:58:55,065 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 171 SyntacticMatches, 1 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2160 ImplicationChecksByTransitivity, 3826.5ms TimeCoverageRelationStatistics Valid=492, Invalid=14270, Unknown=0, NotChecked=0, Total=14762 [2021-05-06 11:58:55,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2021-05-06 11:58:55,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 240. [2021-05-06 11:58:55,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 240 states, 235 states have (on average 1.0170212765957447) internal successors, (239), 235 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 11:58:55,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 243 transitions. [2021-05-06 11:58:55,075 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 243 transitions. Word has length 233 [2021-05-06 11:58:55,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:55,075 INFO L480 AbstractCegarLoop]: Abstraction has 240 states and 243 transitions. [2021-05-06 11:58:55,075 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 61 states, 61 states have (on average 3.7540983606557377) internal successors, (229), 60 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 11:58:55,075 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 243 transitions. [2021-05-06 11:58:55,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2021-05-06 11:58:55,076 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:55,076 INFO L523 BasicCegarLoop]: trace histogram [57, 56, 56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:55,076 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable165 [2021-05-06 11:58:55,076 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:55,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:55,076 INFO L82 PathProgramCache]: Analyzing trace with hash 1724459599, now seen corresponding path program 56 times [2021-05-06 11:58:55,077 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:55,077 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [489490320] [2021-05-06 11:58:55,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:55,082 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:58:55,083 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:55,084 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:55,090 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:55,092 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:55,111 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:58:55,124 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:55,126 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:55,132 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:55,136 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:55,139 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:55,146 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:55,147 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:55,160 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:55,166 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:55,169 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:55,173 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:55,180 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:55,185 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:55,191 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:55,192 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:55,201 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:55,202 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:55,220 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:55,234 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:55,235 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:55,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:55,267 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:55,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:55,270 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:58:55,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:56,855 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:56,856 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [489490320] [2021-05-06 11:58:56,856 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [489490320] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:56,856 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:56,856 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [62] imperfect sequences [] total 62 [2021-05-06 11:58:56,856 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [417241222] [2021-05-06 11:58:56,856 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-06 11:58:56,856 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:56,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-06 11:58:56,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=3964, Unknown=0, NotChecked=0, Total=4160 [2021-05-06 11:58:56,857 INFO L87 Difference]: Start difference. First operand 240 states and 243 transitions. Second operand has 62 states, 62 states have (on average 3.7580645161290325) internal successors, (233), 61 states have internal predecessors, (233), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:03,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:03,774 INFO L93 Difference]: Finished difference Result 253 states and 261 transitions. [2021-05-06 11:59:03,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-06 11:59:03,774 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 3.7580645161290325) internal successors, (233), 61 states have internal predecessors, (233), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 237 [2021-05-06 11:59:03,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:03,775 INFO L225 Difference]: With dead ends: 253 [2021-05-06 11:59:03,775 INFO L226 Difference]: Without dead ends: 244 [2021-05-06 11:59:03,775 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 174 SyntacticMatches, 1 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2227 ImplicationChecksByTransitivity, 3937.6ms TimeCoverageRelationStatistics Valid=500, Invalid=14752, Unknown=0, NotChecked=0, Total=15252 [2021-05-06 11:59:03,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-05-06 11:59:03,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 244. [2021-05-06 11:59:03,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 239 states have (on average 1.0167364016736402) internal successors, (243), 239 states have internal predecessors, (243), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:03,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 247 transitions. [2021-05-06 11:59:03,785 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 247 transitions. Word has length 237 [2021-05-06 11:59:03,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:03,785 INFO L480 AbstractCegarLoop]: Abstraction has 244 states and 247 transitions. [2021-05-06 11:59:03,785 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 62 states, 62 states have (on average 3.7580645161290325) internal successors, (233), 61 states have internal predecessors, (233), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:03,785 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 247 transitions. [2021-05-06 11:59:03,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 242 [2021-05-06 11:59:03,786 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:03,786 INFO L523 BasicCegarLoop]: trace histogram [58, 57, 57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:03,786 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable168 [2021-05-06 11:59:03,786 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:03,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:03,787 INFO L82 PathProgramCache]: Analyzing trace with hash -1683082970, now seen corresponding path program 57 times [2021-05-06 11:59:03,787 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:03,787 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1570955631] [2021-05-06 11:59:03,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:03,793 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:59:03,806 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:03,807 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:03,814 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:03,816 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:03,824 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:59:03,837 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:03,839 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:03,839 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:03,843 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:03,851 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:03,858 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:03,859 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:03,860 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:03,860 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:03,864 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:03,874 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:03,881 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:03,885 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:03,885 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:03,892 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:03,899 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:03,901 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:03,919 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:03,932 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:03,933 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:03,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:03,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:03,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:03,967 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:59:03,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:05,603 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:05,603 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1570955631] [2021-05-06 11:59:05,603 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1570955631] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:05,603 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:05,603 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [63] imperfect sequences [] total 63 [2021-05-06 11:59:05,603 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378217871] [2021-05-06 11:59:05,604 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-06 11:59:05,604 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:05,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-06 11:59:05,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=4091, Unknown=0, NotChecked=0, Total=4290 [2021-05-06 11:59:05,604 INFO L87 Difference]: Start difference. First operand 244 states and 247 transitions. Second operand has 63 states, 63 states have (on average 3.761904761904762) internal successors, (237), 62 states have internal predecessors, (237), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:12,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:12,703 INFO L93 Difference]: Finished difference Result 257 states and 265 transitions. [2021-05-06 11:59:12,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-06 11:59:12,703 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 3.761904761904762) internal successors, (237), 62 states have internal predecessors, (237), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 241 [2021-05-06 11:59:12,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:12,704 INFO L225 Difference]: With dead ends: 257 [2021-05-06 11:59:12,704 INFO L226 Difference]: Without dead ends: 248 [2021-05-06 11:59:12,705 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 177 SyntacticMatches, 1 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2295 ImplicationChecksByTransitivity, 4056.1ms TimeCoverageRelationStatistics Valid=508, Invalid=15242, Unknown=0, NotChecked=0, Total=15750 [2021-05-06 11:59:12,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2021-05-06 11:59:12,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 248. [2021-05-06 11:59:12,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 248 states, 243 states have (on average 1.0164609053497942) internal successors, (247), 243 states have internal predecessors, (247), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:12,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 251 transitions. [2021-05-06 11:59:12,715 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 251 transitions. Word has length 241 [2021-05-06 11:59:12,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:12,715 INFO L480 AbstractCegarLoop]: Abstraction has 248 states and 251 transitions. [2021-05-06 11:59:12,715 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 63 states, 63 states have (on average 3.761904761904762) internal successors, (237), 62 states have internal predecessors, (237), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:12,715 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 251 transitions. [2021-05-06 11:59:12,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2021-05-06 11:59:12,716 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:12,716 INFO L523 BasicCegarLoop]: trace histogram [59, 58, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:12,716 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable171 [2021-05-06 11:59:12,716 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:12,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:12,716 INFO L82 PathProgramCache]: Analyzing trace with hash 913699965, now seen corresponding path program 58 times [2021-05-06 11:59:12,716 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:12,716 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1527853096] [2021-05-06 11:59:12,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:12,730 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:59:12,731 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:12,731 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:12,738 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:12,739 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:12,755 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:59:12,767 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:12,769 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:12,770 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:12,773 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:12,781 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:12,796 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:12,796 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:12,798 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:12,798 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:12,801 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:12,809 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:12,816 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:12,818 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:12,819 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:12,820 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:12,827 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:12,828 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:12,847 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:12,860 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:12,860 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:12,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:12,899 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:12,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:12,901 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:59:12,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:14,625 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:14,625 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1527853096] [2021-05-06 11:59:14,625 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1527853096] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:14,625 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:14,625 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [64] imperfect sequences [] total 64 [2021-05-06 11:59:14,625 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607658089] [2021-05-06 11:59:14,626 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-06 11:59:14,626 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:14,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-06 11:59:14,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=4162, Unknown=0, NotChecked=0, Total=4422 [2021-05-06 11:59:14,626 INFO L87 Difference]: Start difference. First operand 248 states and 251 transitions. Second operand has 64 states, 64 states have (on average 3.765625) internal successors, (241), 63 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 11:59:22,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:22,002 INFO L93 Difference]: Finished difference Result 261 states and 269 transitions. [2021-05-06 11:59:22,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-05-06 11:59:22,003 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 3.765625) internal successors, (241), 63 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 11:59:22,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:22,004 INFO L225 Difference]: With dead ends: 261 [2021-05-06 11:59:22,004 INFO L226 Difference]: Without dead ends: 252 [2021-05-06 11:59:22,004 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 180 SyntacticMatches, 1 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2306 ImplicationChecksByTransitivity, 4213.4ms TimeCoverageRelationStatistics Valid=632, Invalid=15624, Unknown=0, NotChecked=0, Total=16256 [2021-05-06 11:59:22,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2021-05-06 11:59:22,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 252. [2021-05-06 11:59:22,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 247 states have (on average 1.0161943319838056) internal successors, (251), 247 states have internal predecessors, (251), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:22,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 255 transitions. [2021-05-06 11:59:22,015 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 255 transitions. Word has length 245 [2021-05-06 11:59:22,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:22,015 INFO L480 AbstractCegarLoop]: Abstraction has 252 states and 255 transitions. [2021-05-06 11:59:22,015 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 64 states, 64 states have (on average 3.765625) internal successors, (241), 63 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 11:59:22,015 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 255 transitions. [2021-05-06 11:59:22,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2021-05-06 11:59:22,016 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:22,016 INFO L523 BasicCegarLoop]: trace histogram [60, 59, 59, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:22,016 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable174 [2021-05-06 11:59:22,016 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:22,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:22,016 INFO L82 PathProgramCache]: Analyzing trace with hash -697420716, now seen corresponding path program 59 times [2021-05-06 11:59:22,016 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:22,016 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1192796727] [2021-05-06 11:59:22,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:22,025 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:59:22,025 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:22,026 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:22,033 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:22,035 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:22,053 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:59:22,067 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:22,069 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:22,069 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:22,072 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:22,081 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:22,087 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:22,088 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:22,089 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:22,090 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:22,093 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:22,101 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:22,108 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:22,110 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:22,111 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:22,112 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:22,118 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:22,120 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:22,139 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:22,151 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:22,152 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:22,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:22,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:22,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:22,193 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:59:22,194 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:23,907 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:23,907 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1192796727] [2021-05-06 11:59:23,907 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1192796727] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:23,907 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:23,907 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [65] imperfect sequences [] total 65 [2021-05-06 11:59:23,907 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691667833] [2021-05-06 11:59:23,907 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-06 11:59:23,908 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:23,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-06 11:59:23,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=4351, Unknown=0, NotChecked=0, Total=4556 [2021-05-06 11:59:23,908 INFO L87 Difference]: Start difference. First operand 252 states and 255 transitions. Second operand has 65 states, 65 states have (on average 3.769230769230769) internal successors, (245), 64 states have internal predecessors, (245), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:31,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:31,482 INFO L93 Difference]: Finished difference Result 265 states and 273 transitions. [2021-05-06 11:59:31,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-05-06 11:59:31,483 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 3.769230769230769) internal successors, (245), 64 states have internal predecessors, (245), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 249 [2021-05-06 11:59:31,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:31,483 INFO L225 Difference]: With dead ends: 265 [2021-05-06 11:59:31,483 INFO L226 Difference]: Without dead ends: 256 [2021-05-06 11:59:31,484 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 183 SyntacticMatches, 1 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2434 ImplicationChecksByTransitivity, 4289.3ms TimeCoverageRelationStatistics Valid=524, Invalid=16246, Unknown=0, NotChecked=0, Total=16770 [2021-05-06 11:59:31,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2021-05-06 11:59:31,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 256. [2021-05-06 11:59:31,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 251 states have (on average 1.0159362549800797) internal successors, (255), 251 states have internal predecessors, (255), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:31,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 259 transitions. [2021-05-06 11:59:31,494 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 259 transitions. Word has length 249 [2021-05-06 11:59:31,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:31,494 INFO L480 AbstractCegarLoop]: Abstraction has 256 states and 259 transitions. [2021-05-06 11:59:31,494 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 65 states have (on average 3.769230769230769) internal successors, (245), 64 states have internal predecessors, (245), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:31,494 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 259 transitions. [2021-05-06 11:59:31,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 254 [2021-05-06 11:59:31,495 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:31,495 INFO L523 BasicCegarLoop]: trace histogram [61, 60, 60, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:31,495 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable177 [2021-05-06 11:59:31,495 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:31,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:31,496 INFO L82 PathProgramCache]: Analyzing trace with hash 1040494763, now seen corresponding path program 60 times [2021-05-06 11:59:31,496 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:31,496 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1231678706] [2021-05-06 11:59:31,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:31,507 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:59:31,508 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:31,509 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:31,515 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:31,517 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:31,538 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:59:31,551 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 11:59:31,553 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:31,554 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:31,557 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:31,565 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:31,572 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:31,573 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:31,574 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:31,579 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:31,582 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:31,586 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:31,593 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:31,596 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:31,608 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:31,609 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:31,617 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:31,618 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:31,626 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:31,639 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:31,640 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:31,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:31,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:31,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:31,671 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:59:31,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:33,478 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:33,478 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1231678706] [2021-05-06 11:59:33,478 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1231678706] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:33,478 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:33,478 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [66] imperfect sequences [] total 66 [2021-05-06 11:59:33,478 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161678866] [2021-05-06 11:59:33,478 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-06 11:59:33,478 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:33,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-06 11:59:33,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=4484, Unknown=0, NotChecked=0, Total=4692 [2021-05-06 11:59:33,479 INFO L87 Difference]: Start difference. First operand 256 states and 259 transitions. Second operand has 66 states, 66 states have (on average 3.772727272727273) internal successors, (249), 65 states have internal predecessors, (249), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:41,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:41,325 INFO L93 Difference]: Finished difference Result 269 states and 277 transitions. [2021-05-06 11:59:41,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-05-06 11:59:41,325 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 3.772727272727273) internal successors, (249), 65 states have internal predecessors, (249), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 253 [2021-05-06 11:59:41,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:41,326 INFO L225 Difference]: With dead ends: 269 [2021-05-06 11:59:41,326 INFO L226 Difference]: Without dead ends: 260 [2021-05-06 11:59:41,327 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 317 GetRequests, 186 SyntacticMatches, 1 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2505 ImplicationChecksByTransitivity, 4435.1ms TimeCoverageRelationStatistics Valid=532, Invalid=16760, Unknown=0, NotChecked=0, Total=17292 [2021-05-06 11:59:41,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-05-06 11:59:41,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 260. [2021-05-06 11:59:41,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 260 states, 255 states have (on average 1.0156862745098039) internal successors, (259), 255 states have internal predecessors, (259), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:41,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 263 transitions. [2021-05-06 11:59:41,337 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 263 transitions. Word has length 253 [2021-05-06 11:59:41,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:41,337 INFO L480 AbstractCegarLoop]: Abstraction has 260 states and 263 transitions. [2021-05-06 11:59:41,337 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 66 states, 66 states have (on average 3.772727272727273) internal successors, (249), 65 states have internal predecessors, (249), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:41,337 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 263 transitions. [2021-05-06 11:59:41,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2021-05-06 11:59:41,338 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:41,338 INFO L523 BasicCegarLoop]: trace histogram [62, 61, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:41,338 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable180 [2021-05-06 11:59:41,338 INFO L428 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:41,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:41,339 INFO L82 PathProgramCache]: Analyzing trace with hash -1027135102, now seen corresponding path program 61 times [2021-05-06 11:59:41,339 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:41,339 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [635361104] [2021-05-06 11:59:41,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:41,344 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:59:41,357 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:41,358 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:41,365 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:41,367 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:41,374 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:59:41,388 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:41,390 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:41,390 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:41,393 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:41,402 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:41,409 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:41,409 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:41,410 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:41,411 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:41,414 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:41,422 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:41,429 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:41,432 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:41,444 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:41,445 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:41,455 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:41,456 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:41,464 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:41,477 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:41,478 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:41,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:41,517 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:41,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:41,519 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:59:41,520 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:43,348 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:43,348 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [635361104] [2021-05-06 11:59:43,348 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [635361104] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:43,349 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:43,349 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [67] imperfect sequences [] total 67 [2021-05-06 11:59:43,349 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219545142] [2021-05-06 11:59:43,349 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2021-05-06 11:59:43,349 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:43,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-05-06 11:59:43,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=272, Invalid=4558, Unknown=0, NotChecked=0, Total=4830 [2021-05-06 11:59:43,349 INFO L87 Difference]: Start difference. First operand 260 states and 263 transitions. Second operand has 67 states, 67 states have (on average 3.7761194029850746) internal successors, (253), 66 states have internal predecessors, (253), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:51,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:51,418 INFO L93 Difference]: Finished difference Result 273 states and 281 transitions. [2021-05-06 11:59:51,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-05-06 11:59:51,418 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 3.7761194029850746) internal successors, (253), 66 states have internal predecessors, (253), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 257 [2021-05-06 11:59:51,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:51,419 INFO L225 Difference]: With dead ends: 273 [2021-05-06 11:59:51,419 INFO L226 Difference]: Without dead ends: 264 [2021-05-06 11:59:51,419 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 189 SyntacticMatches, 1 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2516 ImplicationChecksByTransitivity, 4541.0ms TimeCoverageRelationStatistics Valid=662, Invalid=17160, Unknown=0, NotChecked=0, Total=17822 [2021-05-06 11:59:51,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2021-05-06 11:59:51,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 264. [2021-05-06 11:59:51,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 264 states, 259 states have (on average 1.0154440154440154) internal successors, (263), 259 states have internal predecessors, (263), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:51,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 267 transitions. [2021-05-06 11:59:51,430 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 267 transitions. Word has length 257 [2021-05-06 11:59:51,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:51,430 INFO L480 AbstractCegarLoop]: Abstraction has 264 states and 267 transitions. [2021-05-06 11:59:51,430 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 67 states, 67 states have (on average 3.7761194029850746) internal successors, (253), 66 states have internal predecessors, (253), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:51,430 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 267 transitions. [2021-05-06 11:59:51,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2021-05-06 11:59:51,431 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:51,431 INFO L523 BasicCegarLoop]: trace histogram [63, 62, 62, 62, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:51,431 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable183 [2021-05-06 11:59:51,431 INFO L428 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:51,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:51,431 INFO L82 PathProgramCache]: Analyzing trace with hash -1117561127, now seen corresponding path program 62 times [2021-05-06 11:59:51,432 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:51,432 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1531700266] [2021-05-06 11:59:51,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:51,437 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 11:59:51,449 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:51,450 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:51,457 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:51,458 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:51,466 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 11:59:51,480 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:51,489 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:51,496 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:51,500 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:51,504 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:51,513 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:51,513 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:51,515 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:51,521 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:51,525 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:51,529 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:51,537 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:51,539 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:51,553 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:51,555 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:51,563 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:51,565 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:51,573 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:51,589 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:51,590 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:51,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:51,619 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:51,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:51,633 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:59:51,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:53,497 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:53,497 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1531700266] [2021-05-06 11:59:53,497 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1531700266] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:53,497 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:53,497 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [68] imperfect sequences [] total 68 [2021-05-06 11:59:53,497 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2057418018] [2021-05-06 11:59:53,497 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2021-05-06 11:59:53,497 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:53,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-05-06 11:59:53,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=4756, Unknown=0, NotChecked=0, Total=4970 [2021-05-06 11:59:53,498 INFO L87 Difference]: Start difference. First operand 264 states and 267 transitions. Second operand has 68 states, 68 states have (on average 3.7794117647058822) internal successors, (257), 67 states have internal predecessors, (257), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:01,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:01,787 INFO L93 Difference]: Finished difference Result 277 states and 285 transitions. [2021-05-06 12:00:01,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-05-06 12:00:01,787 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 3.7794117647058822) internal successors, (257), 67 states have internal predecessors, (257), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 261 [2021-05-06 12:00:01,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:01,788 INFO L225 Difference]: With dead ends: 277 [2021-05-06 12:00:01,788 INFO L226 Difference]: Without dead ends: 268 [2021-05-06 12:00:01,789 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 192 SyntacticMatches, 1 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2650 ImplicationChecksByTransitivity, 4636.5ms TimeCoverageRelationStatistics Valid=548, Invalid=17812, Unknown=0, NotChecked=0, Total=18360 [2021-05-06 12:00:01,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2021-05-06 12:00:01,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 268. [2021-05-06 12:00:01,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 268 states, 263 states have (on average 1.015209125475285) internal successors, (267), 263 states have internal predecessors, (267), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:01,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 271 transitions. [2021-05-06 12:00:01,800 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 271 transitions. Word has length 261 [2021-05-06 12:00:01,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:01,800 INFO L480 AbstractCegarLoop]: Abstraction has 268 states and 271 transitions. [2021-05-06 12:00:01,800 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 68 states, 68 states have (on average 3.7794117647058822) internal successors, (257), 67 states have internal predecessors, (257), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:01,800 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 271 transitions. [2021-05-06 12:00:01,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2021-05-06 12:00:01,801 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:01,801 INFO L523 BasicCegarLoop]: trace histogram [64, 63, 63, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:01,801 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable186 [2021-05-06 12:00:01,801 INFO L428 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:01,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:01,801 INFO L82 PathProgramCache]: Analyzing trace with hash -106491728, now seen corresponding path program 63 times [2021-05-06 12:00:01,801 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:01,802 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1911425965] [2021-05-06 12:00:01,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:01,810 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:00:01,823 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:01,824 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:01,830 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:01,832 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:01,840 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:00:01,853 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 12:00:01,855 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:00:01,860 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:01,864 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:01,867 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:00:01,874 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:01,875 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:01,876 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:00:01,876 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:01,880 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:01,888 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:00:01,895 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:01,897 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:01,898 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:01,899 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:01,906 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:01,908 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:01,926 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:01,939 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:01,940 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:01,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:01,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:01,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:01,972 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:00:01,973 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:03,936 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:03,936 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1911425965] [2021-05-06 12:00:03,936 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1911425965] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:03,936 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:03,936 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [69] imperfect sequences [] total 69 [2021-05-06 12:00:03,936 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962199321] [2021-05-06 12:00:03,936 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2021-05-06 12:00:03,937 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:03,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-05-06 12:00:03,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=4895, Unknown=0, NotChecked=0, Total=5112 [2021-05-06 12:00:03,937 INFO L87 Difference]: Start difference. First operand 268 states and 271 transitions. Second operand has 69 states, 69 states have (on average 3.782608695652174) internal successors, (261), 68 states have internal predecessors, (261), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:12,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:12,611 INFO L93 Difference]: Finished difference Result 281 states and 289 transitions. [2021-05-06 12:00:12,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-05-06 12:00:12,611 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 3.782608695652174) internal successors, (261), 68 states have internal predecessors, (261), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 265 [2021-05-06 12:00:12,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:12,612 INFO L225 Difference]: With dead ends: 281 [2021-05-06 12:00:12,612 INFO L226 Difference]: Without dead ends: 272 [2021-05-06 12:00:12,613 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 195 SyntacticMatches, 1 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2724 ImplicationChecksByTransitivity, 4860.6ms TimeCoverageRelationStatistics Valid=556, Invalid=18350, Unknown=0, NotChecked=0, Total=18906 [2021-05-06 12:00:12,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2021-05-06 12:00:12,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 272. [2021-05-06 12:00:12,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 272 states, 267 states have (on average 1.0149812734082397) internal successors, (271), 267 states have internal predecessors, (271), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:12,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 275 transitions. [2021-05-06 12:00:12,624 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 275 transitions. Word has length 265 [2021-05-06 12:00:12,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:12,624 INFO L480 AbstractCegarLoop]: Abstraction has 272 states and 275 transitions. [2021-05-06 12:00:12,624 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 69 states, 69 states have (on average 3.782608695652174) internal successors, (261), 68 states have internal predecessors, (261), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:12,624 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 275 transitions. [2021-05-06 12:00:12,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2021-05-06 12:00:12,625 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:12,625 INFO L523 BasicCegarLoop]: trace histogram [65, 64, 64, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:12,625 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable189 [2021-05-06 12:00:12,625 INFO L428 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:12,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:12,625 INFO L82 PathProgramCache]: Analyzing trace with hash 645922567, now seen corresponding path program 64 times [2021-05-06 12:00:12,625 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:12,625 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [440624977] [2021-05-06 12:00:12,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:12,636 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:00:12,637 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:12,638 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:12,646 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:12,647 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:12,674 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:00:12,689 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:12,691 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:00:12,692 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:12,695 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:12,714 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:00:12,723 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:12,723 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:12,725 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:00:12,725 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:12,729 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:12,738 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:00:12,746 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:12,750 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:12,751 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:12,752 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:12,761 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:12,763 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:12,788 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:12,802 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 12:00:12,803 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:12,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:12,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:12,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:12,837 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:00:12,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:14,938 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:14,939 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [440624977] [2021-05-06 12:00:14,939 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [440624977] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:14,939 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:14,939 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [70] imperfect sequences [] total 70 [2021-05-06 12:00:14,939 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666199919] [2021-05-06 12:00:14,939 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2021-05-06 12:00:14,939 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:14,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-05-06 12:00:14,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=5036, Unknown=0, NotChecked=0, Total=5256 [2021-05-06 12:00:14,940 INFO L87 Difference]: Start difference. First operand 272 states and 275 transitions. Second operand has 70 states, 70 states have (on average 3.7857142857142856) internal successors, (265), 69 states have internal predecessors, (265), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:24,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:24,101 INFO L93 Difference]: Finished difference Result 285 states and 293 transitions. [2021-05-06 12:00:24,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-05-06 12:00:24,101 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 3.7857142857142856) internal successors, (265), 69 states have internal predecessors, (265), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 269 [2021-05-06 12:00:24,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:24,102 INFO L225 Difference]: With dead ends: 285 [2021-05-06 12:00:24,102 INFO L226 Difference]: Without dead ends: 276 [2021-05-06 12:00:24,103 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 198 SyntacticMatches, 1 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2799 ImplicationChecksByTransitivity, 5116.7ms TimeCoverageRelationStatistics Valid=564, Invalid=18896, Unknown=0, NotChecked=0, Total=19460 [2021-05-06 12:00:24,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2021-05-06 12:00:24,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 276. [2021-05-06 12:00:24,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 276 states, 271 states have (on average 1.014760147601476) internal successors, (275), 271 states have internal predecessors, (275), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:24,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 279 transitions. [2021-05-06 12:00:24,114 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 279 transitions. Word has length 269 [2021-05-06 12:00:24,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:24,114 INFO L480 AbstractCegarLoop]: Abstraction has 276 states and 279 transitions. [2021-05-06 12:00:24,114 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 70 states, 70 states have (on average 3.7857142857142856) internal successors, (265), 69 states have internal predecessors, (265), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:24,114 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 279 transitions. [2021-05-06 12:00:24,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 274 [2021-05-06 12:00:24,115 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:24,115 INFO L523 BasicCegarLoop]: trace histogram [66, 65, 65, 65, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:24,115 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable192 [2021-05-06 12:00:24,115 INFO L428 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:24,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:24,115 INFO L82 PathProgramCache]: Analyzing trace with hash 1174137310, now seen corresponding path program 65 times [2021-05-06 12:00:24,116 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:24,116 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1915890242] [2021-05-06 12:00:24,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:24,125 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:00:24,137 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:24,140 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:24,146 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:24,149 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:24,156 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:00:24,168 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:24,171 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:00:24,171 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:24,174 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:24,182 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:00:24,188 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:24,189 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:24,190 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:00:24,190 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:24,194 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:24,201 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:00:24,207 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:24,219 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:24,232 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:24,233 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:24,245 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:24,246 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:24,254 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:24,267 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:24,268 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:24,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:24,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:24,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:24,297 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:00:24,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:26,373 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:26,373 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1915890242] [2021-05-06 12:00:26,373 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1915890242] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:26,373 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:26,373 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [71] imperfect sequences [] total 71 [2021-05-06 12:00:26,373 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448542706] [2021-05-06 12:00:26,374 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2021-05-06 12:00:26,374 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:26,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-05-06 12:00:26,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=5114, Unknown=0, NotChecked=0, Total=5402 [2021-05-06 12:00:26,374 INFO L87 Difference]: Start difference. First operand 276 states and 279 transitions. Second operand has 71 states, 71 states have (on average 3.788732394366197) internal successors, (269), 70 states have internal predecessors, (269), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:35,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:35,588 INFO L93 Difference]: Finished difference Result 289 states and 297 transitions. [2021-05-06 12:00:35,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-06 12:00:35,589 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 3.788732394366197) internal successors, (269), 70 states have internal predecessors, (269), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 273 [2021-05-06 12:00:35,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:35,589 INFO L225 Difference]: With dead ends: 289 [2021-05-06 12:00:35,589 INFO L226 Difference]: Without dead ends: 280 [2021-05-06 12:00:35,590 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 201 SyntacticMatches, 1 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2810 ImplicationChecksByTransitivity, 5139.0ms TimeCoverageRelationStatistics Valid=702, Invalid=19320, Unknown=0, NotChecked=0, Total=20022 [2021-05-06 12:00:35,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2021-05-06 12:00:35,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 280. [2021-05-06 12:00:35,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 280 states, 275 states have (on average 1.0145454545454546) internal successors, (279), 275 states have internal predecessors, (279), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:35,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 283 transitions. [2021-05-06 12:00:35,602 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 283 transitions. Word has length 273 [2021-05-06 12:00:35,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:35,602 INFO L480 AbstractCegarLoop]: Abstraction has 280 states and 283 transitions. [2021-05-06 12:00:35,602 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 71 states, 71 states have (on average 3.788732394366197) internal successors, (269), 70 states have internal predecessors, (269), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:35,602 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 283 transitions. [2021-05-06 12:00:35,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 278 [2021-05-06 12:00:35,603 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:35,603 INFO L523 BasicCegarLoop]: trace histogram [67, 66, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:35,603 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable195 [2021-05-06 12:00:35,603 INFO L428 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:35,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:35,603 INFO L82 PathProgramCache]: Analyzing trace with hash 491295029, now seen corresponding path program 66 times [2021-05-06 12:00:35,603 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:35,603 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1600213888] [2021-05-06 12:00:35,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:35,609 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:00:35,609 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:35,610 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:35,616 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:35,618 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:35,635 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:00:35,647 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 12:00:35,649 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:00:35,650 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:35,653 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:35,660 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:00:35,667 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:35,667 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:35,668 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:00:35,673 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:35,677 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:35,681 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:00:35,688 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:35,690 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:35,703 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:35,704 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:35,711 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:35,713 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:35,721 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:35,734 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:35,735 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:35,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:35,767 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:35,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:35,769 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:00:35,771 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:37,912 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:37,912 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1600213888] [2021-05-06 12:00:37,912 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1600213888] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:37,913 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:37,913 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [72] imperfect sequences [] total 72 [2021-05-06 12:00:37,913 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523737468] [2021-05-06 12:00:37,913 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2021-05-06 12:00:37,913 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:37,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-05-06 12:00:37,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=5324, Unknown=0, NotChecked=0, Total=5550 [2021-05-06 12:00:37,914 INFO L87 Difference]: Start difference. First operand 280 states and 283 transitions. Second operand has 72 states, 72 states have (on average 3.7916666666666665) internal successors, (273), 71 states have internal predecessors, (273), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:47,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:47,507 INFO L93 Difference]: Finished difference Result 293 states and 301 transitions. [2021-05-06 12:00:47,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-05-06 12:00:47,507 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 3.7916666666666665) internal successors, (273), 71 states have internal predecessors, (273), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 277 [2021-05-06 12:00:47,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:47,508 INFO L225 Difference]: With dead ends: 293 [2021-05-06 12:00:47,508 INFO L226 Difference]: Without dead ends: 284 [2021-05-06 12:00:47,509 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 348 GetRequests, 205 SyntacticMatches, 1 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2952 ImplicationChecksByTransitivity, 5300.3ms TimeCoverageRelationStatistics Valid=580, Invalid=20012, Unknown=0, NotChecked=0, Total=20592 [2021-05-06 12:00:47,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2021-05-06 12:00:47,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 284. [2021-05-06 12:00:47,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 284 states, 279 states have (on average 1.014336917562724) internal successors, (283), 279 states have internal predecessors, (283), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:47,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 287 transitions. [2021-05-06 12:00:47,520 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 287 transitions. Word has length 277 [2021-05-06 12:00:47,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:47,520 INFO L480 AbstractCegarLoop]: Abstraction has 284 states and 287 transitions. [2021-05-06 12:00:47,520 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 72 states, 72 states have (on average 3.7916666666666665) internal successors, (273), 71 states have internal predecessors, (273), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:47,520 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 287 transitions. [2021-05-06 12:00:47,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 282 [2021-05-06 12:00:47,521 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:47,521 INFO L523 BasicCegarLoop]: trace histogram [68, 67, 67, 67, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:47,521 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable198 [2021-05-06 12:00:47,522 INFO L428 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:47,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:47,522 INFO L82 PathProgramCache]: Analyzing trace with hash -1531726580, now seen corresponding path program 67 times [2021-05-06 12:00:47,522 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:47,522 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [464602546] [2021-05-06 12:00:47,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:47,532 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:00:47,533 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:47,534 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:47,541 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:47,543 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:47,561 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:00:47,574 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 12:00:47,577 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:00:47,582 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:47,585 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:47,589 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:00:47,596 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:47,597 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:47,598 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:00:47,598 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:47,602 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:47,614 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:00:47,621 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:47,624 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:47,637 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:47,638 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:47,645 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:47,647 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:47,655 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:47,673 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:47,674 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:47,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:47,704 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:47,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:47,706 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:00:47,707 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:49,973 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:49,973 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [464602546] [2021-05-06 12:00:49,974 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [464602546] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:49,974 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:49,974 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [73] imperfect sequences [] total 73 [2021-05-06 12:00:49,974 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529623537] [2021-05-06 12:00:49,974 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2021-05-06 12:00:49,974 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:49,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-05-06 12:00:49,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=296, Invalid=5404, Unknown=0, NotChecked=0, Total=5700 [2021-05-06 12:00:49,975 INFO L87 Difference]: Start difference. First operand 284 states and 287 transitions. Second operand has 73 states, 73 states have (on average 3.7945205479452055) internal successors, (277), 72 states have internal predecessors, (277), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:59,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:59,729 INFO L93 Difference]: Finished difference Result 297 states and 305 transitions. [2021-05-06 12:00:59,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-05-06 12:00:59,730 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 3.7945205479452055) internal successors, (277), 72 states have internal predecessors, (277), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 281 [2021-05-06 12:00:59,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:59,730 INFO L225 Difference]: With dead ends: 297 [2021-05-06 12:00:59,730 INFO L226 Difference]: Without dead ends: 288 [2021-05-06 12:00:59,731 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 352 GetRequests, 207 SyntacticMatches, 1 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2963 ImplicationChecksByTransitivity, 5474.7ms TimeCoverageRelationStatistics Valid=722, Invalid=20448, Unknown=0, NotChecked=0, Total=21170 [2021-05-06 12:00:59,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2021-05-06 12:00:59,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 288. [2021-05-06 12:00:59,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 288 states, 283 states have (on average 1.0141342756183747) internal successors, (287), 283 states have internal predecessors, (287), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:59,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 291 transitions. [2021-05-06 12:00:59,743 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 291 transitions. Word has length 281 [2021-05-06 12:00:59,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:59,743 INFO L480 AbstractCegarLoop]: Abstraction has 288 states and 291 transitions. [2021-05-06 12:00:59,743 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 73 states, 73 states have (on average 3.7945205479452055) internal successors, (277), 72 states have internal predecessors, (277), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:59,743 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 291 transitions. [2021-05-06 12:00:59,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2021-05-06 12:00:59,744 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:59,744 INFO L523 BasicCegarLoop]: trace histogram [69, 68, 68, 68, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:59,744 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable201 [2021-05-06 12:00:59,744 INFO L428 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:59,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:59,744 INFO L82 PathProgramCache]: Analyzing trace with hash 2007700835, now seen corresponding path program 68 times [2021-05-06 12:00:59,744 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:59,744 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [459486590] [2021-05-06 12:00:59,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:59,750 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:00:59,750 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:59,751 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:59,760 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:59,761 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:59,783 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:00:59,796 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:59,798 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:00:59,804 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:59,807 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:59,811 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:00:59,818 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:59,818 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:59,819 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:00:59,820 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:59,824 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:59,833 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:00:59,840 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:59,842 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:59,855 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:59,856 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:59,862 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:59,864 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:59,872 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:59,886 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:59,886 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:59,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:59,916 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:59,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:59,918 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:00:59,919 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:02,183 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:01:02,183 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [459486590] [2021-05-06 12:01:02,183 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [459486590] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:01:02,183 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:01:02,183 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [74] imperfect sequences [] total 74 [2021-05-06 12:01:02,184 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020234571] [2021-05-06 12:01:02,184 INFO L460 AbstractCegarLoop]: Interpolant automaton has 74 states [2021-05-06 12:01:02,184 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:01:02,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-05-06 12:01:02,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=5620, Unknown=0, NotChecked=0, Total=5852 [2021-05-06 12:01:02,184 INFO L87 Difference]: Start difference. First operand 288 states and 291 transitions. Second operand has 74 states, 74 states have (on average 3.7972972972972974) internal successors, (281), 73 states have internal predecessors, (281), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:12,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:01:12,206 INFO L93 Difference]: Finished difference Result 301 states and 309 transitions. [2021-05-06 12:01:12,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-05-06 12:01:12,207 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 3.7972972972972974) internal successors, (281), 73 states have internal predecessors, (281), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 285 [2021-05-06 12:01:12,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:01:12,208 INFO L225 Difference]: With dead ends: 301 [2021-05-06 12:01:12,208 INFO L226 Difference]: Without dead ends: 292 [2021-05-06 12:01:12,209 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 210 SyntacticMatches, 1 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3109 ImplicationChecksByTransitivity, 5547.2ms TimeCoverageRelationStatistics Valid=596, Invalid=21160, Unknown=0, NotChecked=0, Total=21756 [2021-05-06 12:01:12,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2021-05-06 12:01:12,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 292. [2021-05-06 12:01:12,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 287 states have (on average 1.0139372822299653) internal successors, (291), 287 states have internal predecessors, (291), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:12,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 295 transitions. [2021-05-06 12:01:12,220 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 295 transitions. Word has length 285 [2021-05-06 12:01:12,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:01:12,221 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 295 transitions. [2021-05-06 12:01:12,221 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 74 states, 74 states have (on average 3.7972972972972974) internal successors, (281), 73 states have internal predecessors, (281), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:12,221 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 295 transitions. [2021-05-06 12:01:12,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 290 [2021-05-06 12:01:12,222 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:01:12,222 INFO L523 BasicCegarLoop]: trace histogram [70, 69, 69, 69, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:01:12,222 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable204 [2021-05-06 12:01:12,222 INFO L428 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:01:12,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:01:12,222 INFO L82 PathProgramCache]: Analyzing trace with hash 1153200698, now seen corresponding path program 69 times [2021-05-06 12:01:12,222 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:01:12,222 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1412670286] [2021-05-06 12:01:12,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:01:12,228 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:01:12,228 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:12,229 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:12,237 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:12,239 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:12,261 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:01:12,275 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:12,277 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:01:12,277 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:12,281 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:12,289 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:01:12,296 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:12,297 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:12,298 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:01:12,303 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:12,307 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:12,311 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:01:12,318 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:12,321 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:12,334 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:12,334 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:12,341 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:12,343 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:12,350 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:12,364 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:12,364 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:12,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:12,390 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:01:12,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:12,392 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 12:01:12,394 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:14,710 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:01:14,710 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1412670286] [2021-05-06 12:01:14,710 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1412670286] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:01:14,710 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:01:14,710 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [75] imperfect sequences [] total 75 [2021-05-06 12:01:14,710 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444153618] [2021-05-06 12:01:14,710 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2021-05-06 12:01:14,710 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:01:14,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-05-06 12:01:14,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=5702, Unknown=0, NotChecked=0, Total=6006 [2021-05-06 12:01:14,711 INFO L87 Difference]: Start difference. First operand 292 states and 295 transitions. Second operand has 75 states, 75 states have (on average 3.8) internal successors, (285), 74 states have internal predecessors, (285), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:25,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:01:25,068 INFO L93 Difference]: Finished difference Result 305 states and 313 transitions. [2021-05-06 12:01:25,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-05-06 12:01:25,069 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 3.8) internal successors, (285), 74 states have internal predecessors, (285), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 289 [2021-05-06 12:01:25,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:01:25,070 INFO L225 Difference]: With dead ends: 305 [2021-05-06 12:01:25,070 INFO L226 Difference]: Without dead ends: 296 [2021-05-06 12:01:25,071 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 213 SyntacticMatches, 1 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3120 ImplicationChecksByTransitivity, 5700.5ms TimeCoverageRelationStatistics Valid=742, Invalid=21608, Unknown=0, NotChecked=0, Total=22350 [2021-05-06 12:01:25,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2021-05-06 12:01:25,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 296. [2021-05-06 12:01:25,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 296 states, 291 states have (on average 1.013745704467354) internal successors, (295), 291 states have internal predecessors, (295), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:25,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 299 transitions. [2021-05-06 12:01:25,083 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 299 transitions. Word has length 289 [2021-05-06 12:01:25,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:01:25,083 INFO L480 AbstractCegarLoop]: Abstraction has 296 states and 299 transitions. [2021-05-06 12:01:25,083 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 75 states, 75 states have (on average 3.8) internal successors, (285), 74 states have internal predecessors, (285), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:25,083 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 299 transitions. [2021-05-06 12:01:25,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 294 [2021-05-06 12:01:25,084 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:01:25,084 INFO L523 BasicCegarLoop]: trace histogram [71, 70, 70, 70, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:01:25,084 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable207 [2021-05-06 12:01:25,084 INFO L428 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:01:25,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:01:25,084 INFO L82 PathProgramCache]: Analyzing trace with hash 1033210769, now seen corresponding path program 70 times [2021-05-06 12:01:25,084 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:01:25,085 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1889929964] [2021-05-06 12:01:25,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:01:25,093 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:01:25,110 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:25,111 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:25,119 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:25,120 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:25,128 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:01:25,142 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:25,144 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:01:25,150 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:25,153 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:25,157 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:01:25,164 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:25,164 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:25,165 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:01:25,166 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:25,169 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:25,178 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:01:25,185 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:25,188 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:25,200 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:25,202 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:25,209 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:25,211 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:25,219 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:25,232 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 12:01:25,233 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:25,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:25,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:01:25,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:25,266 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:01:25,267 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:27,613 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:01:27,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1889929964] [2021-05-06 12:01:27,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1889929964] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:01:27,614 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:01:27,614 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [76] imperfect sequences [] total 76 [2021-05-06 12:01:27,614 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523230651] [2021-05-06 12:01:27,614 INFO L460 AbstractCegarLoop]: Interpolant automaton has 76 states [2021-05-06 12:01:27,614 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:01:27,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-05-06 12:01:27,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=5924, Unknown=0, NotChecked=0, Total=6162 [2021-05-06 12:01:27,615 INFO L87 Difference]: Start difference. First operand 296 states and 299 transitions. Second operand has 76 states, 76 states have (on average 3.8026315789473686) internal successors, (289), 75 states have internal predecessors, (289), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:38,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:01:38,263 INFO L93 Difference]: Finished difference Result 309 states and 317 transitions. [2021-05-06 12:01:38,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-05-06 12:01:38,263 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 3.8026315789473686) internal successors, (289), 75 states have internal predecessors, (289), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 293 [2021-05-06 12:01:38,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:01:38,264 INFO L225 Difference]: With dead ends: 309 [2021-05-06 12:01:38,264 INFO L226 Difference]: Without dead ends: 300 [2021-05-06 12:01:38,265 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 367 GetRequests, 216 SyntacticMatches, 1 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3270 ImplicationChecksByTransitivity, 5838.5ms TimeCoverageRelationStatistics Valid=612, Invalid=22340, Unknown=0, NotChecked=0, Total=22952 [2021-05-06 12:01:38,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 300 states. [2021-05-06 12:01:38,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 300 to 300. [2021-05-06 12:01:38,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 300 states, 295 states have (on average 1.0135593220338983) internal successors, (299), 295 states have internal predecessors, (299), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:38,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 303 transitions. [2021-05-06 12:01:38,277 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 303 transitions. Word has length 293 [2021-05-06 12:01:38,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:01:38,277 INFO L480 AbstractCegarLoop]: Abstraction has 300 states and 303 transitions. [2021-05-06 12:01:38,277 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 76 states, 76 states have (on average 3.8026315789473686) internal successors, (289), 75 states have internal predecessors, (289), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:38,277 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 303 transitions. [2021-05-06 12:01:38,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2021-05-06 12:01:38,278 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:01:38,278 INFO L523 BasicCegarLoop]: trace histogram [72, 71, 71, 71, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:01:38,278 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable210 [2021-05-06 12:01:38,278 INFO L428 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:01:38,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:01:38,278 INFO L82 PathProgramCache]: Analyzing trace with hash -2029772440, now seen corresponding path program 71 times [2021-05-06 12:01:38,279 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:01:38,279 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [968021916] [2021-05-06 12:01:38,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:01:38,284 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:01:38,297 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:38,298 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:38,304 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:38,306 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:38,314 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:01:38,327 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:38,329 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:01:38,330 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:38,333 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:38,341 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:01:38,348 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:38,348 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:38,350 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:01:38,350 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:38,354 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:38,363 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:01:38,370 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:38,372 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:38,385 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:38,387 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:38,393 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:38,395 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:38,403 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:38,416 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:38,417 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:38,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:38,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:01:38,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:38,453 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:01:38,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:40,898 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:01:40,898 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [968021916] [2021-05-06 12:01:40,898 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [968021916] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:01:40,898 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:01:40,898 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [77] imperfect sequences [] total 77 [2021-05-06 12:01:40,898 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216049003] [2021-05-06 12:01:40,898 INFO L460 AbstractCegarLoop]: Interpolant automaton has 77 states [2021-05-06 12:01:40,898 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:01:40,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-05-06 12:01:40,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=6079, Unknown=0, NotChecked=0, Total=6320 [2021-05-06 12:01:40,899 INFO L87 Difference]: Start difference. First operand 300 states and 303 transitions. Second operand has 77 states, 77 states have (on average 3.8051948051948052) internal successors, (293), 76 states have internal predecessors, (293), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:51,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:01:51,651 INFO L93 Difference]: Finished difference Result 313 states and 321 transitions. [2021-05-06 12:01:51,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-05-06 12:01:51,651 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 3.8051948051948052) internal successors, (293), 76 states have internal predecessors, (293), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 297 [2021-05-06 12:01:51,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:01:51,652 INFO L225 Difference]: With dead ends: 313 [2021-05-06 12:01:51,652 INFO L226 Difference]: Without dead ends: 304 [2021-05-06 12:01:51,653 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 219 SyntacticMatches, 1 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3352 ImplicationChecksByTransitivity, 5956.4ms TimeCoverageRelationStatistics Valid=620, Invalid=22942, Unknown=0, NotChecked=0, Total=23562 [2021-05-06 12:01:51,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2021-05-06 12:01:51,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 304. [2021-05-06 12:01:51,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 304 states, 299 states have (on average 1.0133779264214047) internal successors, (303), 299 states have internal predecessors, (303), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:51,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 307 transitions. [2021-05-06 12:01:51,665 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 307 transitions. Word has length 297 [2021-05-06 12:01:51,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:01:51,665 INFO L480 AbstractCegarLoop]: Abstraction has 304 states and 307 transitions. [2021-05-06 12:01:51,665 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 77 states, 77 states have (on average 3.8051948051948052) internal successors, (293), 76 states have internal predecessors, (293), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:51,665 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 307 transitions. [2021-05-06 12:01:51,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 302 [2021-05-06 12:01:51,666 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:01:51,666 INFO L523 BasicCegarLoop]: trace histogram [73, 72, 72, 72, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:01:51,666 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable213 [2021-05-06 12:01:51,666 INFO L428 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:01:51,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:01:51,666 INFO L82 PathProgramCache]: Analyzing trace with hash -1460276289, now seen corresponding path program 72 times [2021-05-06 12:01:51,667 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:01:51,667 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1700399257] [2021-05-06 12:01:51,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:01:51,685 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:01:51,685 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:51,686 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:51,693 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:51,694 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:51,711 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:01:51,728 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:51,730 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:01:51,735 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:51,738 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:51,741 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:01:51,747 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:51,748 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:51,749 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:01:51,750 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:51,753 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:51,760 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:01:51,766 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:51,769 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:51,769 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:51,770 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:51,776 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:51,778 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:51,794 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:51,807 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:51,808 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:51,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:51,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:01:51,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:51,838 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:01:51,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:54,281 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:01:54,281 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1700399257] [2021-05-06 12:01:54,281 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1700399257] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:01:54,281 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:01:54,281 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [78] imperfect sequences [] total 78 [2021-05-06 12:01:54,282 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1612805775] [2021-05-06 12:01:54,282 INFO L460 AbstractCegarLoop]: Interpolant automaton has 78 states [2021-05-06 12:01:54,282 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:01:54,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-05-06 12:01:54,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=244, Invalid=6236, Unknown=0, NotChecked=0, Total=6480 [2021-05-06 12:01:54,283 INFO L87 Difference]: Start difference. First operand 304 states and 307 transitions. Second operand has 78 states, 78 states have (on average 3.8076923076923075) internal successors, (297), 77 states have internal predecessors, (297), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:05,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:02:05,208 INFO L93 Difference]: Finished difference Result 317 states and 325 transitions. [2021-05-06 12:02:05,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-05-06 12:02:05,208 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 78 states have (on average 3.8076923076923075) internal successors, (297), 77 states have internal predecessors, (297), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 301 [2021-05-06 12:02:05,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:02:05,209 INFO L225 Difference]: With dead ends: 317 [2021-05-06 12:02:05,209 INFO L226 Difference]: Without dead ends: 308 [2021-05-06 12:02:05,210 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 377 GetRequests, 222 SyntacticMatches, 1 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3435 ImplicationChecksByTransitivity, 5993.5ms TimeCoverageRelationStatistics Valid=628, Invalid=23552, Unknown=0, NotChecked=0, Total=24180 [2021-05-06 12:02:05,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2021-05-06 12:02:05,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 308. [2021-05-06 12:02:05,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 308 states, 303 states have (on average 1.0132013201320131) internal successors, (307), 303 states have internal predecessors, (307), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:05,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 311 transitions. [2021-05-06 12:02:05,222 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 311 transitions. Word has length 301 [2021-05-06 12:02:05,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:02:05,222 INFO L480 AbstractCegarLoop]: Abstraction has 308 states and 311 transitions. [2021-05-06 12:02:05,222 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 78 states, 78 states have (on average 3.8076923076923075) internal successors, (297), 77 states have internal predecessors, (297), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:05,222 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 311 transitions. [2021-05-06 12:02:05,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2021-05-06 12:02:05,223 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:02:05,223 INFO L523 BasicCegarLoop]: trace histogram [74, 73, 73, 73, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:02:05,223 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable216 [2021-05-06 12:02:05,223 INFO L428 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:02:05,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:02:05,224 INFO L82 PathProgramCache]: Analyzing trace with hash -25640298, now seen corresponding path program 73 times [2021-05-06 12:02:05,224 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:02:05,224 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1678100570] [2021-05-06 12:02:05,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:02:05,229 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:02:05,242 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:05,246 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:05,254 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:05,256 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:05,264 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:02:05,277 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:05,279 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:02:05,285 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:05,288 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:05,292 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:02:05,299 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:05,299 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:05,301 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:02:05,311 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:05,315 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:05,318 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:02:05,325 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:05,328 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:05,341 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:05,342 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:05,349 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:05,351 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:05,358 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:05,372 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:05,372 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:05,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:05,405 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:02:05,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:05,407 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:02:05,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:07,898 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:02:07,898 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1678100570] [2021-05-06 12:02:07,899 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1678100570] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:02:07,899 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:02:07,899 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [79] imperfect sequences [] total 79 [2021-05-06 12:02:07,899 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466866614] [2021-05-06 12:02:07,899 INFO L460 AbstractCegarLoop]: Interpolant automaton has 79 states [2021-05-06 12:02:07,899 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:02:07,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-05-06 12:02:07,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=247, Invalid=6395, Unknown=0, NotChecked=0, Total=6642 [2021-05-06 12:02:07,900 INFO L87 Difference]: Start difference. First operand 308 states and 311 transitions. Second operand has 79 states, 79 states have (on average 3.810126582278481) internal successors, (301), 78 states have internal predecessors, (301), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:19,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:02:19,077 INFO L93 Difference]: Finished difference Result 321 states and 329 transitions. [2021-05-06 12:02:19,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-05-06 12:02:19,078 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 3.810126582278481) internal successors, (301), 78 states have internal predecessors, (301), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 305 [2021-05-06 12:02:19,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:02:19,079 INFO L225 Difference]: With dead ends: 321 [2021-05-06 12:02:19,079 INFO L226 Difference]: Without dead ends: 312 [2021-05-06 12:02:19,079 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 225 SyntacticMatches, 1 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3519 ImplicationChecksByTransitivity, 6129.6ms TimeCoverageRelationStatistics Valid=636, Invalid=24170, Unknown=0, NotChecked=0, Total=24806 [2021-05-06 12:02:19,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2021-05-06 12:02:19,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 312. [2021-05-06 12:02:19,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 312 states, 307 states have (on average 1.013029315960912) internal successors, (311), 307 states have internal predecessors, (311), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:19,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 315 transitions. [2021-05-06 12:02:19,092 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 315 transitions. Word has length 305 [2021-05-06 12:02:19,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:02:19,092 INFO L480 AbstractCegarLoop]: Abstraction has 312 states and 315 transitions. [2021-05-06 12:02:19,092 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 79 states, 79 states have (on average 3.810126582278481) internal successors, (301), 78 states have internal predecessors, (301), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:19,092 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 315 transitions. [2021-05-06 12:02:19,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2021-05-06 12:02:19,093 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:02:19,093 INFO L523 BasicCegarLoop]: trace histogram [75, 74, 74, 74, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:02:19,093 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable219 [2021-05-06 12:02:19,093 INFO L428 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:02:19,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:02:19,093 INFO L82 PathProgramCache]: Analyzing trace with hash 632966637, now seen corresponding path program 74 times [2021-05-06 12:02:19,093 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:02:19,094 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1753380225] [2021-05-06 12:02:19,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:02:19,103 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:02:19,103 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:19,104 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:19,111 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:19,113 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:19,132 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:02:19,145 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:19,147 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:02:19,153 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:19,156 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:19,160 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:02:19,167 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:19,167 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:19,168 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:02:19,169 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:19,172 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:19,181 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:02:19,188 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:19,190 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:19,204 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:19,205 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:19,211 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:19,213 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:19,221 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:19,234 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:19,235 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:19,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:19,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:02:19,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:19,271 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:02:19,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:21,859 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:02:21,860 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1753380225] [2021-05-06 12:02:21,860 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1753380225] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:02:21,860 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:02:21,860 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [80] imperfect sequences [] total 80 [2021-05-06 12:02:21,860 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481677005] [2021-05-06 12:02:21,860 INFO L460 AbstractCegarLoop]: Interpolant automaton has 80 states [2021-05-06 12:02:21,860 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:02:21,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-05-06 12:02:21,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=6482, Unknown=0, NotChecked=0, Total=6806 [2021-05-06 12:02:21,861 INFO L87 Difference]: Start difference. First operand 312 states and 315 transitions. Second operand has 80 states, 80 states have (on average 3.8125) internal successors, (305), 79 states have internal predecessors, (305), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:33,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:02:33,434 INFO L93 Difference]: Finished difference Result 325 states and 333 transitions. [2021-05-06 12:02:33,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-05-06 12:02:33,435 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 3.8125) internal successors, (305), 79 states have internal predecessors, (305), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 309 [2021-05-06 12:02:33,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:02:33,436 INFO L225 Difference]: With dead ends: 325 [2021-05-06 12:02:33,436 INFO L226 Difference]: Without dead ends: 316 [2021-05-06 12:02:33,437 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 387 GetRequests, 228 SyntacticMatches, 1 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3530 ImplicationChecksByTransitivity, 6325.2ms TimeCoverageRelationStatistics Valid=792, Invalid=24648, Unknown=0, NotChecked=0, Total=25440 [2021-05-06 12:02:33,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 316 states. [2021-05-06 12:02:33,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 316 to 316. [2021-05-06 12:02:33,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 311 states have (on average 1.0128617363344052) internal successors, (315), 311 states have internal predecessors, (315), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:33,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 319 transitions. [2021-05-06 12:02:33,449 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 319 transitions. Word has length 309 [2021-05-06 12:02:33,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:02:33,449 INFO L480 AbstractCegarLoop]: Abstraction has 316 states and 319 transitions. [2021-05-06 12:02:33,449 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 80 states, 80 states have (on average 3.8125) internal successors, (305), 79 states have internal predecessors, (305), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:33,449 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 319 transitions. [2021-05-06 12:02:33,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 314 [2021-05-06 12:02:33,450 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:02:33,450 INFO L523 BasicCegarLoop]: trace histogram [76, 75, 75, 75, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:02:33,450 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable222 [2021-05-06 12:02:33,450 INFO L428 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:02:33,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:02:33,451 INFO L82 PathProgramCache]: Analyzing trace with hash 1879594436, now seen corresponding path program 75 times [2021-05-06 12:02:33,451 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:02:33,451 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1207555750] [2021-05-06 12:02:33,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:02:33,456 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:02:33,469 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:33,470 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:33,477 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:33,478 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:33,486 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:02:33,499 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:33,501 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:02:33,506 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:33,515 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:33,519 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:02:33,526 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:33,527 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:33,528 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:02:33,534 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:33,537 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:33,541 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:02:33,547 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:33,550 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:33,562 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:33,569 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:33,576 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:33,578 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:33,585 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:33,598 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:33,609 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:33,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:33,638 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:02:33,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:33,640 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:02:33,642 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:36,254 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:02:36,254 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1207555750] [2021-05-06 12:02:36,255 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1207555750] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:02:36,255 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:02:36,255 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [81] imperfect sequences [] total 81 [2021-05-06 12:02:36,255 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992646898] [2021-05-06 12:02:36,255 INFO L460 AbstractCegarLoop]: Interpolant automaton has 81 states [2021-05-06 12:02:36,255 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:02:36,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2021-05-06 12:02:36,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=6719, Unknown=0, NotChecked=0, Total=6972 [2021-05-06 12:02:36,256 INFO L87 Difference]: Start difference. First operand 316 states and 319 transitions. Second operand has 81 states, 81 states have (on average 3.814814814814815) internal successors, (309), 80 states have internal predecessors, (309), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:47,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:02:47,943 INFO L93 Difference]: Finished difference Result 329 states and 337 transitions. [2021-05-06 12:02:47,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-05-06 12:02:47,944 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 81 states have (on average 3.814814814814815) internal successors, (309), 80 states have internal predecessors, (309), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 313 [2021-05-06 12:02:47,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:02:47,945 INFO L225 Difference]: With dead ends: 329 [2021-05-06 12:02:47,945 INFO L226 Difference]: Without dead ends: 320 [2021-05-06 12:02:47,946 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 392 GetRequests, 231 SyntacticMatches, 1 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3690 ImplicationChecksByTransitivity, 6378.6ms TimeCoverageRelationStatistics Valid=652, Invalid=25430, Unknown=0, NotChecked=0, Total=26082 [2021-05-06 12:02:47,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2021-05-06 12:02:47,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 320. [2021-05-06 12:02:47,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 320 states, 315 states have (on average 1.0126984126984127) internal successors, (319), 315 states have internal predecessors, (319), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:47,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 320 states to 320 states and 323 transitions. [2021-05-06 12:02:47,958 INFO L78 Accepts]: Start accepts. Automaton has 320 states and 323 transitions. Word has length 313 [2021-05-06 12:02:47,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:02:47,958 INFO L480 AbstractCegarLoop]: Abstraction has 320 states and 323 transitions. [2021-05-06 12:02:47,958 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 81 states, 81 states have (on average 3.814814814814815) internal successors, (309), 80 states have internal predecessors, (309), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:47,958 INFO L276 IsEmpty]: Start isEmpty. Operand 320 states and 323 transitions. [2021-05-06 12:02:47,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 318 [2021-05-06 12:02:47,959 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:02:47,959 INFO L523 BasicCegarLoop]: trace histogram [77, 76, 76, 76, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:02:47,959 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable225 [2021-05-06 12:02:47,959 INFO L428 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:02:47,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:02:47,960 INFO L82 PathProgramCache]: Analyzing trace with hash 1372625435, now seen corresponding path program 76 times [2021-05-06 12:02:47,960 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:02:47,960 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1692182953] [2021-05-06 12:02:47,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:02:47,965 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:02:47,966 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:47,967 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:47,973 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:47,975 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:47,993 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:02:48,006 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:48,016 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:02:48,021 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:48,025 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:48,029 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:02:48,036 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:48,043 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:48,044 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:02:48,049 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:48,053 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:48,056 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:02:48,063 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:48,065 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:48,077 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:48,078 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:48,086 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:48,087 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:48,095 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:48,108 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:48,109 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:48,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:48,138 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:02:48,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:48,145 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:02:48,146 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:50,840 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:02:50,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1692182953] [2021-05-06 12:02:50,840 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1692182953] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:02:50,840 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:02:50,840 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [82] imperfect sequences [] total 82 [2021-05-06 12:02:50,840 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127983782] [2021-05-06 12:02:50,841 INFO L460 AbstractCegarLoop]: Interpolant automaton has 82 states [2021-05-06 12:02:50,841 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:02:50,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-05-06 12:02:50,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=332, Invalid=6808, Unknown=0, NotChecked=0, Total=7140 [2021-05-06 12:02:50,841 INFO L87 Difference]: Start difference. First operand 320 states and 323 transitions. Second operand has 82 states, 82 states have (on average 3.817073170731707) internal successors, (313), 81 states have internal predecessors, (313), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:02,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:02,915 INFO L93 Difference]: Finished difference Result 333 states and 341 transitions. [2021-05-06 12:03:02,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-05-06 12:03:02,916 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 3.817073170731707) internal successors, (313), 81 states have internal predecessors, (313), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 317 [2021-05-06 12:03:02,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:02,917 INFO L225 Difference]: With dead ends: 333 [2021-05-06 12:03:02,917 INFO L226 Difference]: Without dead ends: 324 [2021-05-06 12:03:02,917 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 397 GetRequests, 234 SyntacticMatches, 1 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3701 ImplicationChecksByTransitivity, 6575.9ms TimeCoverageRelationStatistics Valid=812, Invalid=25920, Unknown=0, NotChecked=0, Total=26732 [2021-05-06 12:03:02,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 324 states. [2021-05-06 12:03:02,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 324 to 324. [2021-05-06 12:03:02,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 324 states, 319 states have (on average 1.0125391849529781) internal successors, (323), 319 states have internal predecessors, (323), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:02,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 327 transitions. [2021-05-06 12:03:02,930 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 327 transitions. Word has length 317 [2021-05-06 12:03:02,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:02,930 INFO L480 AbstractCegarLoop]: Abstraction has 324 states and 327 transitions. [2021-05-06 12:03:02,930 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 82 states, 82 states have (on average 3.817073170731707) internal successors, (313), 81 states have internal predecessors, (313), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:02,930 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 327 transitions. [2021-05-06 12:03:02,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 322 [2021-05-06 12:03:02,931 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:02,931 INFO L523 BasicCegarLoop]: trace histogram [78, 77, 77, 77, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:02,931 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable228 [2021-05-06 12:03:02,931 INFO L428 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:02,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:02,932 INFO L82 PathProgramCache]: Analyzing trace with hash -761210126, now seen corresponding path program 77 times [2021-05-06 12:03:02,932 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:02,932 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1567131151] [2021-05-06 12:03:02,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:02,937 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:03:02,938 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:02,939 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:02,946 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:02,948 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:02,969 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:03:02,982 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:02,997 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:03:02,998 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:03,001 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:03,010 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:03:03,017 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:03,017 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:03,019 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:03:03,024 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:03,027 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:03,031 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:03:03,038 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:03,054 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:03:03,055 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:03,056 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:03,064 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:03,066 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:03,084 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:03:03,097 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 12:03:03,098 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:03,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:03,129 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:03,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:03,131 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:03,132 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:05,958 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:05,959 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1567131151] [2021-05-06 12:03:05,959 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1567131151] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:05,959 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:05,959 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [83] imperfect sequences [] total 83 [2021-05-06 12:03:05,959 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537888687] [2021-05-06 12:03:05,959 INFO L460 AbstractCegarLoop]: Interpolant automaton has 83 states [2021-05-06 12:03:05,959 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:05,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-05-06 12:03:05,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=7051, Unknown=0, NotChecked=0, Total=7310 [2021-05-06 12:03:05,960 INFO L87 Difference]: Start difference. First operand 324 states and 327 transitions. Second operand has 83 states, 83 states have (on average 3.819277108433735) internal successors, (317), 82 states have internal predecessors, (317), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:18,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:18,291 INFO L93 Difference]: Finished difference Result 337 states and 345 transitions. [2021-05-06 12:03:18,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-05-06 12:03:18,291 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 3.819277108433735) internal successors, (317), 82 states have internal predecessors, (317), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 321 [2021-05-06 12:03:18,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:18,292 INFO L225 Difference]: With dead ends: 337 [2021-05-06 12:03:18,292 INFO L226 Difference]: Without dead ends: 328 [2021-05-06 12:03:18,293 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 237 SyntacticMatches, 1 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3865 ImplicationChecksByTransitivity, 6790.4ms TimeCoverageRelationStatistics Valid=668, Invalid=26722, Unknown=0, NotChecked=0, Total=27390 [2021-05-06 12:03:18,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2021-05-06 12:03:18,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 328. [2021-05-06 12:03:18,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 328 states, 323 states have (on average 1.0123839009287925) internal successors, (327), 323 states have internal predecessors, (327), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:18,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 331 transitions. [2021-05-06 12:03:18,306 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 331 transitions. Word has length 321 [2021-05-06 12:03:18,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:18,306 INFO L480 AbstractCegarLoop]: Abstraction has 328 states and 331 transitions. [2021-05-06 12:03:18,306 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 83 states, 83 states have (on average 3.819277108433735) internal successors, (317), 82 states have internal predecessors, (317), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:18,306 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 331 transitions. [2021-05-06 12:03:18,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2021-05-06 12:03:18,307 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:18,307 INFO L523 BasicCegarLoop]: trace histogram [79, 78, 78, 78, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:18,307 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable231 [2021-05-06 12:03:18,307 INFO L428 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:18,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:18,308 INFO L82 PathProgramCache]: Analyzing trace with hash -47785911, now seen corresponding path program 78 times [2021-05-06 12:03:18,308 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:18,308 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [389432779] [2021-05-06 12:03:18,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:18,313 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:03:18,314 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:18,315 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:18,322 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:18,324 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:18,342 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:03:18,356 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:18,358 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:03:18,363 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:18,367 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:18,371 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:03:18,378 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:18,378 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:18,379 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:03:18,385 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:18,388 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:18,398 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:03:18,405 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:18,407 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:03:18,408 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:18,409 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:18,417 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:18,418 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:18,437 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:03:18,450 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:18,451 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:18,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:18,477 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:18,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:18,479 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:18,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:21,293 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:21,293 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [389432779] [2021-05-06 12:03:21,293 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [389432779] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:21,293 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:21,293 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [84] imperfect sequences [] total 84 [2021-05-06 12:03:21,293 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074868078] [2021-05-06 12:03:21,294 INFO L460 AbstractCegarLoop]: Interpolant automaton has 84 states [2021-05-06 12:03:21,294 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:21,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-05-06 12:03:21,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=262, Invalid=7220, Unknown=0, NotChecked=0, Total=7482 [2021-05-06 12:03:21,294 INFO L87 Difference]: Start difference. First operand 328 states and 331 transitions. Second operand has 84 states, 84 states have (on average 3.8214285714285716) internal successors, (321), 83 states have internal predecessors, (321), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:33,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:33,876 INFO L93 Difference]: Finished difference Result 341 states and 349 transitions. [2021-05-06 12:03:33,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2021-05-06 12:03:33,876 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 3.8214285714285716) internal successors, (321), 83 states have internal predecessors, (321), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 325 [2021-05-06 12:03:33,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:33,877 INFO L225 Difference]: With dead ends: 341 [2021-05-06 12:03:33,877 INFO L226 Difference]: Without dead ends: 332 [2021-05-06 12:03:33,878 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 407 GetRequests, 240 SyntacticMatches, 1 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3954 ImplicationChecksByTransitivity, 6869.9ms TimeCoverageRelationStatistics Valid=676, Invalid=27380, Unknown=0, NotChecked=0, Total=28056 [2021-05-06 12:03:33,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 332 states. [2021-05-06 12:03:33,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 332 to 332. [2021-05-06 12:03:33,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 332 states, 327 states have (on average 1.0122324159021407) internal successors, (331), 327 states have internal predecessors, (331), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:33,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 335 transitions. [2021-05-06 12:03:33,891 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 335 transitions. Word has length 325 [2021-05-06 12:03:33,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:33,891 INFO L480 AbstractCegarLoop]: Abstraction has 332 states and 335 transitions. [2021-05-06 12:03:33,891 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 84 states, 84 states have (on average 3.8214285714285716) internal successors, (321), 83 states have internal predecessors, (321), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:33,891 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 335 transitions. [2021-05-06 12:03:33,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 330 [2021-05-06 12:03:33,892 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:33,892 INFO L523 BasicCegarLoop]: trace histogram [80, 79, 79, 79, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:33,892 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable234 [2021-05-06 12:03:33,892 INFO L428 AbstractCegarLoop]: === Iteration 81 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:33,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:33,893 INFO L82 PathProgramCache]: Analyzing trace with hash 1328566816, now seen corresponding path program 79 times [2021-05-06 12:03:33,893 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:33,893 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1559495087] [2021-05-06 12:03:33,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:33,898 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:03:33,899 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:33,900 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:33,907 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:33,908 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:33,926 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:03:33,940 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:33,942 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:03:33,947 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:33,950 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:33,954 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:03:33,961 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:33,961 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:33,963 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:03:33,968 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:33,971 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:33,975 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:03:33,992 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:33,998 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:03:34,011 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:34,012 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:34,019 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:34,021 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:34,028 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:03:34,041 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:34,042 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:34,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:34,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:34,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:34,079 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 12:03:34,080 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:36,989 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:36,989 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1559495087] [2021-05-06 12:03:36,989 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1559495087] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:36,989 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:36,989 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [85] imperfect sequences [] total 85 [2021-05-06 12:03:36,989 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [455119750] [2021-05-06 12:03:36,989 INFO L460 AbstractCegarLoop]: Interpolant automaton has 85 states [2021-05-06 12:03:36,989 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:36,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-05-06 12:03:36,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=7391, Unknown=0, NotChecked=0, Total=7656 [2021-05-06 12:03:36,990 INFO L87 Difference]: Start difference. First operand 332 states and 335 transitions. Second operand has 85 states, 85 states have (on average 3.823529411764706) internal successors, (325), 84 states have internal predecessors, (325), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:49,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:49,875 INFO L93 Difference]: Finished difference Result 345 states and 353 transitions. [2021-05-06 12:03:49,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-05-06 12:03:49,875 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 85 states have (on average 3.823529411764706) internal successors, (325), 84 states have internal predecessors, (325), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 329 [2021-05-06 12:03:49,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:49,876 INFO L225 Difference]: With dead ends: 345 [2021-05-06 12:03:49,876 INFO L226 Difference]: Without dead ends: 336 [2021-05-06 12:03:49,877 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 412 GetRequests, 243 SyntacticMatches, 1 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4044 ImplicationChecksByTransitivity, 7031.6ms TimeCoverageRelationStatistics Valid=684, Invalid=28046, Unknown=0, NotChecked=0, Total=28730 [2021-05-06 12:03:49,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 336 states. [2021-05-06 12:03:49,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 336 to 336. [2021-05-06 12:03:49,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 336 states, 331 states have (on average 1.012084592145015) internal successors, (335), 331 states have internal predecessors, (335), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:49,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 339 transitions. [2021-05-06 12:03:49,892 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 339 transitions. Word has length 329 [2021-05-06 12:03:49,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:49,892 INFO L480 AbstractCegarLoop]: Abstraction has 336 states and 339 transitions. [2021-05-06 12:03:49,893 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 85 states, 85 states have (on average 3.823529411764706) internal successors, (325), 84 states have internal predecessors, (325), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:49,893 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 339 transitions. [2021-05-06 12:03:49,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2021-05-06 12:03:49,894 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:49,894 INFO L523 BasicCegarLoop]: trace histogram [81, 80, 80, 80, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:49,894 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable237 [2021-05-06 12:03:49,894 INFO L428 AbstractCegarLoop]: === Iteration 82 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:49,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:49,894 INFO L82 PathProgramCache]: Analyzing trace with hash 699074679, now seen corresponding path program 80 times [2021-05-06 12:03:49,895 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:49,895 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1697179185] [2021-05-06 12:03:49,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:49,902 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:03:49,902 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:49,904 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:49,913 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:49,915 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:49,934 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:03:49,949 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 12:03:49,951 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:03:49,952 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:49,956 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:49,965 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:03:49,972 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:49,972 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:49,974 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:03:49,979 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:49,982 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:49,986 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:03:49,993 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:49,995 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:03:49,996 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:49,997 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:50,005 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:50,007 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:50,028 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:03:50,048 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:50,050 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:50,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:50,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:50,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:50,084 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:50,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:53,068 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:53,068 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1697179185] [2021-05-06 12:03:53,068 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1697179185] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:53,068 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:53,068 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [86] imperfect sequences [] total 86 [2021-05-06 12:03:53,068 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [645627401] [2021-05-06 12:03:53,068 INFO L460 AbstractCegarLoop]: Interpolant automaton has 86 states [2021-05-06 12:03:53,068 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:53,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-05-06 12:03:53,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=268, Invalid=7564, Unknown=0, NotChecked=0, Total=7832 [2021-05-06 12:03:53,069 INFO L87 Difference]: Start difference. First operand 336 states and 339 transitions. Second operand has 86 states, 86 states have (on average 3.8255813953488373) internal successors, (329), 85 states have internal predecessors, (329), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:06,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:06,446 INFO L93 Difference]: Finished difference Result 349 states and 357 transitions. [2021-05-06 12:04:06,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-05-06 12:04:06,446 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 3.8255813953488373) internal successors, (329), 85 states have internal predecessors, (329), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 333 [2021-05-06 12:04:06,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:06,447 INFO L225 Difference]: With dead ends: 349 [2021-05-06 12:04:06,447 INFO L226 Difference]: Without dead ends: 340 [2021-05-06 12:04:06,448 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 247 SyntacticMatches, 1 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4135 ImplicationChecksByTransitivity, 7229.7ms TimeCoverageRelationStatistics Valid=692, Invalid=28720, Unknown=0, NotChecked=0, Total=29412 [2021-05-06 12:04:06,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2021-05-06 12:04:06,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 340. [2021-05-06 12:04:06,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 340 states, 335 states have (on average 1.0119402985074626) internal successors, (339), 335 states have internal predecessors, (339), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:06,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 340 states to 340 states and 343 transitions. [2021-05-06 12:04:06,462 INFO L78 Accepts]: Start accepts. Automaton has 340 states and 343 transitions. Word has length 333 [2021-05-06 12:04:06,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:06,462 INFO L480 AbstractCegarLoop]: Abstraction has 340 states and 343 transitions. [2021-05-06 12:04:06,462 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 86 states, 86 states have (on average 3.8255813953488373) internal successors, (329), 85 states have internal predecessors, (329), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:06,462 INFO L276 IsEmpty]: Start isEmpty. Operand 340 states and 343 transitions. [2021-05-06 12:04:06,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 338 [2021-05-06 12:04:06,463 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:06,463 INFO L523 BasicCegarLoop]: trace histogram [82, 81, 81, 81, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:06,463 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable240 [2021-05-06 12:04:06,463 INFO L428 AbstractCegarLoop]: === Iteration 83 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:06,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:06,463 INFO L82 PathProgramCache]: Analyzing trace with hash 1084537678, now seen corresponding path program 81 times [2021-05-06 12:04:06,463 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:06,463 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [334888504] [2021-05-06 12:04:06,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:06,470 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:04:06,471 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,481 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,488 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:06,490 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:06,508 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:04:06,522 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:06,524 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:04:06,529 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,533 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:06,537 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:04:06,544 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:06,545 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:06,546 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:04:06,551 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,555 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:06,558 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:04:06,565 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:06,568 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:04:06,581 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,581 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:06,588 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:06,590 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:06,598 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:04:06,611 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 12:04:06,612 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:06,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:06,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:06,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:06,641 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:06,642 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:09,694 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:09,694 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [334888504] [2021-05-06 12:04:09,694 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [334888504] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:09,694 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:09,694 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [87] imperfect sequences [] total 87 [2021-05-06 12:04:09,694 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482035791] [2021-05-06 12:04:09,694 INFO L460 AbstractCegarLoop]: Interpolant automaton has 87 states [2021-05-06 12:04:09,694 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:09,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-05-06 12:04:09,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=7739, Unknown=0, NotChecked=0, Total=8010 [2021-05-06 12:04:09,695 INFO L87 Difference]: Start difference. First operand 340 states and 343 transitions. Second operand has 87 states, 87 states have (on average 3.8275862068965516) internal successors, (333), 86 states have internal predecessors, (333), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:23,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:23,484 INFO L93 Difference]: Finished difference Result 353 states and 361 transitions. [2021-05-06 12:04:23,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-05-06 12:04:23,485 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 3.8275862068965516) internal successors, (333), 86 states have internal predecessors, (333), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 337 [2021-05-06 12:04:23,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:23,486 INFO L225 Difference]: With dead ends: 353 [2021-05-06 12:04:23,486 INFO L226 Difference]: Without dead ends: 344 [2021-05-06 12:04:23,486 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 250 SyntacticMatches, 1 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4227 ImplicationChecksByTransitivity, 7426.3ms TimeCoverageRelationStatistics Valid=700, Invalid=29402, Unknown=0, NotChecked=0, Total=30102 [2021-05-06 12:04:23,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2021-05-06 12:04:23,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 344. [2021-05-06 12:04:23,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 344 states, 339 states have (on average 1.0117994100294985) internal successors, (343), 339 states have internal predecessors, (343), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:23,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344 states to 344 states and 347 transitions. [2021-05-06 12:04:23,500 INFO L78 Accepts]: Start accepts. Automaton has 344 states and 347 transitions. Word has length 337 [2021-05-06 12:04:23,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:23,500 INFO L480 AbstractCegarLoop]: Abstraction has 344 states and 347 transitions. [2021-05-06 12:04:23,500 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 87 states, 87 states have (on average 3.8275862068965516) internal successors, (333), 86 states have internal predecessors, (333), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:23,500 INFO L276 IsEmpty]: Start isEmpty. Operand 344 states and 347 transitions. [2021-05-06 12:04:23,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 342 [2021-05-06 12:04:23,501 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:23,502 INFO L523 BasicCegarLoop]: trace histogram [83, 82, 82, 82, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:23,502 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable243 [2021-05-06 12:04:23,502 INFO L428 AbstractCegarLoop]: === Iteration 84 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:23,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:23,502 INFO L82 PathProgramCache]: Analyzing trace with hash 189475493, now seen corresponding path program 82 times [2021-05-06 12:04:23,502 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:23,502 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1145487927] [2021-05-06 12:04:23,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:23,508 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:04:23,521 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:23,521 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:23,529 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:23,531 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:23,538 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:04:23,552 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:23,554 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:04:23,554 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:23,558 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:23,566 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:04:23,573 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:23,574 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:23,575 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:04:23,575 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:23,579 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:23,587 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:04:23,594 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:23,596 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:04:23,597 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:23,598 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:23,604 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:23,606 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:23,625 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:04:23,638 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:23,639 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:23,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:23,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:23,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:23,675 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:23,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:26,767 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:26,767 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1145487927] [2021-05-06 12:04:26,767 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1145487927] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:26,767 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:26,767 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [88] imperfect sequences [] total 88 [2021-05-06 12:04:26,767 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1118832151] [2021-05-06 12:04:26,768 INFO L460 AbstractCegarLoop]: Interpolant automaton has 88 states [2021-05-06 12:04:26,768 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:26,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2021-05-06 12:04:26,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=7916, Unknown=0, NotChecked=0, Total=8190 [2021-05-06 12:04:26,768 INFO L87 Difference]: Start difference. First operand 344 states and 347 transitions. Second operand has 88 states, 88 states have (on average 3.8295454545454546) internal successors, (337), 87 states have internal predecessors, (337), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:40,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:40,660 INFO L93 Difference]: Finished difference Result 357 states and 365 transitions. [2021-05-06 12:04:40,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2021-05-06 12:04:40,660 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 3.8295454545454546) internal successors, (337), 87 states have internal predecessors, (337), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 341 [2021-05-06 12:04:40,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:40,661 INFO L225 Difference]: With dead ends: 357 [2021-05-06 12:04:40,661 INFO L226 Difference]: Without dead ends: 348 [2021-05-06 12:04:40,662 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 427 GetRequests, 252 SyntacticMatches, 1 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4320 ImplicationChecksByTransitivity, 7528.6ms TimeCoverageRelationStatistics Valid=708, Invalid=30092, Unknown=0, NotChecked=0, Total=30800 [2021-05-06 12:04:40,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2021-05-06 12:04:40,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 348. [2021-05-06 12:04:40,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 348 states, 343 states have (on average 1.0116618075801749) internal successors, (347), 343 states have internal predecessors, (347), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:40,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 351 transitions. [2021-05-06 12:04:40,676 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 351 transitions. Word has length 341 [2021-05-06 12:04:40,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:40,676 INFO L480 AbstractCegarLoop]: Abstraction has 348 states and 351 transitions. [2021-05-06 12:04:40,676 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 88 states, 88 states have (on average 3.8295454545454546) internal successors, (337), 87 states have internal predecessors, (337), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:40,676 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 351 transitions. [2021-05-06 12:04:40,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 346 [2021-05-06 12:04:40,677 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:40,677 INFO L523 BasicCegarLoop]: trace histogram [84, 83, 83, 83, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:40,678 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable246 [2021-05-06 12:04:40,678 INFO L428 AbstractCegarLoop]: === Iteration 85 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:40,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:40,678 INFO L82 PathProgramCache]: Analyzing trace with hash 871110268, now seen corresponding path program 83 times [2021-05-06 12:04:40,678 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:40,678 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [653864011] [2021-05-06 12:04:40,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:40,683 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:04:40,696 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,698 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,707 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:40,710 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:40,718 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:04:40,733 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:40,735 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:04:40,742 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,745 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:40,750 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:04:40,757 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:40,758 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:40,759 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:04:40,765 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,769 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:40,774 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:04:40,782 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:40,784 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:04:40,785 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,786 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,794 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:40,796 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:40,814 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:04:40,828 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 12:04:40,829 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:40,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:40,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:40,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:40,862 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:40,864 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:44,021 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:44,021 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [653864011] [2021-05-06 12:04:44,021 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [653864011] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:44,021 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:44,021 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [89] imperfect sequences [] total 89 [2021-05-06 12:04:44,022 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800858935] [2021-05-06 12:04:44,022 INFO L460 AbstractCegarLoop]: Interpolant automaton has 89 states [2021-05-06 12:04:44,022 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:44,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2021-05-06 12:04:44,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=8095, Unknown=0, NotChecked=0, Total=8372 [2021-05-06 12:04:44,023 INFO L87 Difference]: Start difference. First operand 348 states and 351 transitions. Second operand has 89 states, 89 states have (on average 3.831460674157303) internal successors, (341), 88 states have internal predecessors, (341), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:58,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:58,338 INFO L93 Difference]: Finished difference Result 361 states and 369 transitions. [2021-05-06 12:04:58,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2021-05-06 12:04:58,339 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 3.831460674157303) internal successors, (341), 88 states have internal predecessors, (341), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 345 [2021-05-06 12:04:58,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:58,340 INFO L225 Difference]: With dead ends: 361 [2021-05-06 12:04:58,340 INFO L226 Difference]: Without dead ends: 352 [2021-05-06 12:04:58,341 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 432 GetRequests, 255 SyntacticMatches, 1 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4414 ImplicationChecksByTransitivity, 7687.7ms TimeCoverageRelationStatistics Valid=716, Invalid=30790, Unknown=0, NotChecked=0, Total=31506 [2021-05-06 12:04:58,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2021-05-06 12:04:58,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 352. [2021-05-06 12:04:58,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 352 states, 347 states have (on average 1.0115273775216138) internal successors, (351), 347 states have internal predecessors, (351), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:58,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 355 transitions. [2021-05-06 12:04:58,354 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 355 transitions. Word has length 345 [2021-05-06 12:04:58,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:58,355 INFO L480 AbstractCegarLoop]: Abstraction has 352 states and 355 transitions. [2021-05-06 12:04:58,355 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 89 states, 89 states have (on average 3.831460674157303) internal successors, (341), 88 states have internal predecessors, (341), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:58,355 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 355 transitions. [2021-05-06 12:04:58,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 350 [2021-05-06 12:04:58,356 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:58,356 INFO L523 BasicCegarLoop]: trace histogram [85, 84, 84, 84, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:58,356 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable249 [2021-05-06 12:04:58,356 INFO L428 AbstractCegarLoop]: === Iteration 86 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:58,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:58,356 INFO L82 PathProgramCache]: Analyzing trace with hash 133512915, now seen corresponding path program 84 times [2021-05-06 12:04:58,356 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:58,356 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [268410649] [2021-05-06 12:04:58,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:58,362 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:04:58,363 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:58,364 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:58,371 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:58,373 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:58,391 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:04:58,404 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:58,406 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:04:58,407 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:58,410 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:58,418 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:04:58,425 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:58,426 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:58,427 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:04:58,428 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:58,431 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:58,439 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:04:58,446 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:58,449 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:04:58,449 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:58,450 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:58,458 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:58,459 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:58,478 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:04:58,491 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 12:04:58,492 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:58,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:58,525 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:58,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:58,527 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:58,529 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:01,758 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:01,758 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [268410649] [2021-05-06 12:05:01,758 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [268410649] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:01,758 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:01,758 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [90] imperfect sequences [] total 90 [2021-05-06 12:05:01,758 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459023779] [2021-05-06 12:05:01,759 INFO L460 AbstractCegarLoop]: Interpolant automaton has 90 states [2021-05-06 12:05:01,759 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:01,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2021-05-06 12:05:01,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=8276, Unknown=0, NotChecked=0, Total=8556 [2021-05-06 12:05:01,759 INFO L87 Difference]: Start difference. First operand 352 states and 355 transitions. Second operand has 90 states, 90 states have (on average 3.8333333333333335) internal successors, (345), 89 states have internal predecessors, (345), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:17,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:17,145 INFO L93 Difference]: Finished difference Result 365 states and 373 transitions. [2021-05-06 12:05:17,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-05-06 12:05:17,145 INFO L78 Accepts]: Start accepts. Automaton has has 90 states, 90 states have (on average 3.8333333333333335) internal successors, (345), 89 states have internal predecessors, (345), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 349 [2021-05-06 12:05:17,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:17,146 INFO L225 Difference]: With dead ends: 365 [2021-05-06 12:05:17,146 INFO L226 Difference]: Without dead ends: 356 [2021-05-06 12:05:17,147 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 258 SyntacticMatches, 1 SemanticMatches, 178 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4509 ImplicationChecksByTransitivity, 8071.4ms TimeCoverageRelationStatistics Valid=724, Invalid=31496, Unknown=0, NotChecked=0, Total=32220 [2021-05-06 12:05:17,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356 states. [2021-05-06 12:05:17,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356 to 356. [2021-05-06 12:05:17,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 356 states, 351 states have (on average 1.0113960113960114) internal successors, (355), 351 states have internal predecessors, (355), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:17,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 356 states to 356 states and 359 transitions. [2021-05-06 12:05:17,161 INFO L78 Accepts]: Start accepts. Automaton has 356 states and 359 transitions. Word has length 349 [2021-05-06 12:05:17,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:17,161 INFO L480 AbstractCegarLoop]: Abstraction has 356 states and 359 transitions. [2021-05-06 12:05:17,161 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 90 states, 90 states have (on average 3.8333333333333335) internal successors, (345), 89 states have internal predecessors, (345), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:17,162 INFO L276 IsEmpty]: Start isEmpty. Operand 356 states and 359 transitions. [2021-05-06 12:05:17,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 354 [2021-05-06 12:05:17,163 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:17,163 INFO L523 BasicCegarLoop]: trace histogram [86, 85, 85, 85, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:17,163 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable252 [2021-05-06 12:05:17,163 INFO L428 AbstractCegarLoop]: === Iteration 87 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:17,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:17,163 INFO L82 PathProgramCache]: Analyzing trace with hash -403414102, now seen corresponding path program 85 times [2021-05-06 12:05:17,163 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:17,163 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1340752453] [2021-05-06 12:05:17,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:17,169 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:05:17,169 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:17,170 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:17,178 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:17,180 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:17,198 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:05:17,211 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 12:05:17,214 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:05:17,214 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:17,217 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:17,226 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:05:17,233 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:17,233 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:17,235 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:05:17,240 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:17,243 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:17,247 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:05:17,254 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:17,257 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:05:17,257 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:17,261 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:17,269 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:17,271 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:17,289 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:05:17,302 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:17,303 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:17,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:17,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:17,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:17,332 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:17,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:20,635 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:20,635 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1340752453] [2021-05-06 12:05:20,635 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1340752453] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:20,635 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:20,635 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [91] imperfect sequences [] total 91 [2021-05-06 12:05:20,635 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021964275] [2021-05-06 12:05:20,636 INFO L460 AbstractCegarLoop]: Interpolant automaton has 91 states [2021-05-06 12:05:20,636 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:20,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2021-05-06 12:05:20,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=368, Invalid=8374, Unknown=0, NotChecked=0, Total=8742 [2021-05-06 12:05:20,636 INFO L87 Difference]: Start difference. First operand 356 states and 359 transitions. Second operand has 91 states, 91 states have (on average 3.8351648351648353) internal successors, (349), 90 states have internal predecessors, (349), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:36,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:36,226 INFO L93 Difference]: Finished difference Result 369 states and 377 transitions. [2021-05-06 12:05:36,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2021-05-06 12:05:36,226 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 3.8351648351648353) internal successors, (349), 90 states have internal predecessors, (349), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 353 [2021-05-06 12:05:36,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:36,227 INFO L225 Difference]: With dead ends: 369 [2021-05-06 12:05:36,227 INFO L226 Difference]: Without dead ends: 360 [2021-05-06 12:05:36,229 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 442 GetRequests, 261 SyntacticMatches, 1 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4520 ImplicationChecksByTransitivity, 8219.4ms TimeCoverageRelationStatistics Valid=902, Invalid=32040, Unknown=0, NotChecked=0, Total=32942 [2021-05-06 12:05:36,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2021-05-06 12:05:36,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 360. [2021-05-06 12:05:36,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 360 states, 355 states have (on average 1.0112676056338028) internal successors, (359), 355 states have internal predecessors, (359), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:36,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 363 transitions. [2021-05-06 12:05:36,243 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 363 transitions. Word has length 353 [2021-05-06 12:05:36,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:36,243 INFO L480 AbstractCegarLoop]: Abstraction has 360 states and 363 transitions. [2021-05-06 12:05:36,243 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 91 states, 91 states have (on average 3.8351648351648353) internal successors, (349), 90 states have internal predecessors, (349), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:36,243 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 363 transitions. [2021-05-06 12:05:36,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 358 [2021-05-06 12:05:36,244 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:36,244 INFO L523 BasicCegarLoop]: trace histogram [87, 86, 86, 86, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:36,244 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable255 [2021-05-06 12:05:36,244 INFO L428 AbstractCegarLoop]: === Iteration 88 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:36,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:36,245 INFO L82 PathProgramCache]: Analyzing trace with hash -1214823167, now seen corresponding path program 86 times [2021-05-06 12:05:36,245 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:36,245 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [998167502] [2021-05-06 12:05:36,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:36,250 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:05:36,263 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:36,265 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:36,272 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:36,274 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:36,282 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:05:36,295 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:36,297 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:05:36,298 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:36,302 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:36,313 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:05:36,319 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:36,320 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:36,322 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:05:36,322 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:36,326 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:36,334 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:05:36,352 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:36,355 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:05:36,368 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:36,369 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:36,376 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:36,378 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:36,386 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:05:36,399 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 12:05:36,400 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:36,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:36,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:36,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:36,435 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:36,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:39,800 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:39,801 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [998167502] [2021-05-06 12:05:39,801 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [998167502] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:39,801 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:39,801 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [92] imperfect sequences [] total 92 [2021-05-06 12:05:39,801 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665519959] [2021-05-06 12:05:39,801 INFO L460 AbstractCegarLoop]: Interpolant automaton has 92 states [2021-05-06 12:05:39,801 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:39,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2021-05-06 12:05:39,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=8644, Unknown=0, NotChecked=0, Total=8930 [2021-05-06 12:05:39,802 INFO L87 Difference]: Start difference. First operand 360 states and 363 transitions. Second operand has 92 states, 92 states have (on average 3.8369565217391304) internal successors, (353), 91 states have internal predecessors, (353), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:54,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:54,988 INFO L93 Difference]: Finished difference Result 373 states and 381 transitions. [2021-05-06 12:05:54,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2021-05-06 12:05:54,988 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 92 states have (on average 3.8369565217391304) internal successors, (353), 91 states have internal predecessors, (353), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 357 [2021-05-06 12:05:54,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:54,989 INFO L225 Difference]: With dead ends: 373 [2021-05-06 12:05:54,990 INFO L226 Difference]: Without dead ends: 364 [2021-05-06 12:05:54,991 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 447 GetRequests, 264 SyntacticMatches, 1 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4702 ImplicationChecksByTransitivity, 8184.0ms TimeCoverageRelationStatistics Valid=740, Invalid=32932, Unknown=0, NotChecked=0, Total=33672 [2021-05-06 12:05:54,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 364 states. [2021-05-06 12:05:55,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 364 to 364. [2021-05-06 12:05:55,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 364 states, 359 states have (on average 1.011142061281337) internal successors, (363), 359 states have internal predecessors, (363), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:55,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 367 transitions. [2021-05-06 12:05:55,005 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 367 transitions. Word has length 357 [2021-05-06 12:05:55,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:55,005 INFO L480 AbstractCegarLoop]: Abstraction has 364 states and 367 transitions. [2021-05-06 12:05:55,005 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 92 states, 92 states have (on average 3.8369565217391304) internal successors, (353), 91 states have internal predecessors, (353), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:55,005 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 367 transitions. [2021-05-06 12:05:55,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 362 [2021-05-06 12:05:55,006 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:55,006 INFO L523 BasicCegarLoop]: trace histogram [88, 87, 87, 87, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:55,006 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable258 [2021-05-06 12:05:55,007 INFO L428 AbstractCegarLoop]: === Iteration 89 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:55,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:55,007 INFO L82 PathProgramCache]: Analyzing trace with hash 1303093976, now seen corresponding path program 87 times [2021-05-06 12:05:55,007 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:55,007 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1706951467] [2021-05-06 12:05:55,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:55,013 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:05:55,013 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:55,014 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:55,021 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:55,022 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:55,041 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:05:55,054 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:55,056 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:05:55,057 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:55,060 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:55,069 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:05:55,075 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:55,076 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:55,077 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:05:55,077 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:55,081 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:55,089 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:05:55,096 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:55,098 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:05:55,111 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:55,112 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:55,119 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:55,121 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:55,129 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:05:55,142 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:55,143 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:55,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:55,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:55,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:55,171 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:55,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:58,565 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:58,565 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1706951467] [2021-05-06 12:05:58,565 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1706951467] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:58,565 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:58,565 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [93] imperfect sequences [] total 93 [2021-05-06 12:05:58,565 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1866078162] [2021-05-06 12:05:58,565 INFO L460 AbstractCegarLoop]: Interpolant automaton has 93 states [2021-05-06 12:05:58,565 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:58,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2021-05-06 12:05:58,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=289, Invalid=8831, Unknown=0, NotChecked=0, Total=9120 [2021-05-06 12:05:58,566 INFO L87 Difference]: Start difference. First operand 364 states and 367 transitions. Second operand has 93 states, 93 states have (on average 3.838709677419355) internal successors, (357), 92 states have internal predecessors, (357), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:14,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:14,016 INFO L93 Difference]: Finished difference Result 377 states and 385 transitions. [2021-05-06 12:06:14,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2021-05-06 12:06:14,016 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 3.838709677419355) internal successors, (357), 92 states have internal predecessors, (357), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 361 [2021-05-06 12:06:14,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:14,017 INFO L225 Difference]: With dead ends: 377 [2021-05-06 12:06:14,017 INFO L226 Difference]: Without dead ends: 368 [2021-05-06 12:06:14,018 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 452 GetRequests, 267 SyntacticMatches, 1 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4800 ImplicationChecksByTransitivity, 8265.4ms TimeCoverageRelationStatistics Valid=748, Invalid=33662, Unknown=0, NotChecked=0, Total=34410 [2021-05-06 12:06:14,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 368 states. [2021-05-06 12:06:14,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 368 to 368. [2021-05-06 12:06:14,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 368 states, 363 states have (on average 1.0110192837465564) internal successors, (367), 363 states have internal predecessors, (367), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:14,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 371 transitions. [2021-05-06 12:06:14,033 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 371 transitions. Word has length 361 [2021-05-06 12:06:14,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:14,033 INFO L480 AbstractCegarLoop]: Abstraction has 368 states and 371 transitions. [2021-05-06 12:06:14,033 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 93 states, 93 states have (on average 3.838709677419355) internal successors, (357), 92 states have internal predecessors, (357), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:14,033 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 371 transitions. [2021-05-06 12:06:14,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 366 [2021-05-06 12:06:14,034 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:14,034 INFO L523 BasicCegarLoop]: trace histogram [89, 88, 88, 88, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:14,034 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable261 [2021-05-06 12:06:14,034 INFO L428 AbstractCegarLoop]: === Iteration 90 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:14,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:14,035 INFO L82 PathProgramCache]: Analyzing trace with hash -467714769, now seen corresponding path program 88 times [2021-05-06 12:06:14,035 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:14,035 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1603150262] [2021-05-06 12:06:14,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:14,040 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:06:14,041 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:14,042 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:14,049 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:14,051 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:14,070 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:06:14,083 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:14,085 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:06:14,086 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:14,089 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:14,098 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:06:14,104 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:14,105 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:14,106 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:06:14,107 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:14,110 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:14,119 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:06:14,126 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:14,128 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:06:14,129 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:14,130 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:14,138 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:14,139 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:14,157 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:06:14,171 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:14,171 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:14,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:14,215 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:14,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:14,217 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:14,218 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:17,724 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:17,724 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1603150262] [2021-05-06 12:06:17,724 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1603150262] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:17,724 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:17,724 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [94] imperfect sequences [] total 94 [2021-05-06 12:06:17,725 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507133475] [2021-05-06 12:06:17,725 INFO L460 AbstractCegarLoop]: Interpolant automaton has 94 states [2021-05-06 12:06:17,725 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:17,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2021-05-06 12:06:17,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=8932, Unknown=0, NotChecked=0, Total=9312 [2021-05-06 12:06:17,726 INFO L87 Difference]: Start difference. First operand 368 states and 371 transitions. Second operand has 94 states, 94 states have (on average 3.8404255319148937) internal successors, (361), 93 states have internal predecessors, (361), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:33,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:33,582 INFO L93 Difference]: Finished difference Result 381 states and 389 transitions. [2021-05-06 12:06:33,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2021-05-06 12:06:33,582 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 3.8404255319148937) internal successors, (361), 93 states have internal predecessors, (361), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 365 [2021-05-06 12:06:33,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:33,583 INFO L225 Difference]: With dead ends: 381 [2021-05-06 12:06:33,583 INFO L226 Difference]: Without dead ends: 372 [2021-05-06 12:06:33,584 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 457 GetRequests, 270 SyntacticMatches, 1 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4811 ImplicationChecksByTransitivity, 8469.2ms TimeCoverageRelationStatistics Valid=932, Invalid=34224, Unknown=0, NotChecked=0, Total=35156 [2021-05-06 12:06:33,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 372 states. [2021-05-06 12:06:33,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 372 to 372. [2021-05-06 12:06:33,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 372 states, 367 states have (on average 1.0108991825613078) internal successors, (371), 367 states have internal predecessors, (371), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:33,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 372 states to 372 states and 375 transitions. [2021-05-06 12:06:33,599 INFO L78 Accepts]: Start accepts. Automaton has 372 states and 375 transitions. Word has length 365 [2021-05-06 12:06:33,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:33,599 INFO L480 AbstractCegarLoop]: Abstraction has 372 states and 375 transitions. [2021-05-06 12:06:33,599 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 94 states, 94 states have (on average 3.8404255319148937) internal successors, (361), 93 states have internal predecessors, (361), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:33,599 INFO L276 IsEmpty]: Start isEmpty. Operand 372 states and 375 transitions. [2021-05-06 12:06:33,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 370 [2021-05-06 12:06:33,600 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:33,600 INFO L523 BasicCegarLoop]: trace histogram [90, 89, 89, 89, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:33,600 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable264 [2021-05-06 12:06:33,600 INFO L428 AbstractCegarLoop]: === Iteration 91 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:33,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:33,601 INFO L82 PathProgramCache]: Analyzing trace with hash -2013277178, now seen corresponding path program 89 times [2021-05-06 12:06:33,601 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:33,601 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2063476944] [2021-05-06 12:06:33,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:33,606 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:06:33,607 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:33,609 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:33,616 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:33,618 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:33,636 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:06:33,649 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:33,651 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:06:33,656 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:33,659 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:33,663 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:06:33,670 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:33,671 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:33,672 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:06:33,677 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:33,681 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:33,685 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:06:33,691 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:33,694 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:06:33,695 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:33,696 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:33,703 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:33,705 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:33,723 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:06:33,737 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:33,737 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:33,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:33,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:33,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:33,771 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:33,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:38,032 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:38,032 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2063476944] [2021-05-06 12:06:38,032 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2063476944] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:38,032 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:38,032 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [95] imperfect sequences [] total 95 [2021-05-06 12:06:38,032 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [39549507] [2021-05-06 12:06:38,032 INFO L460 AbstractCegarLoop]: Interpolant automaton has 95 states [2021-05-06 12:06:38,033 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:38,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2021-05-06 12:06:38,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=295, Invalid=9211, Unknown=0, NotChecked=0, Total=9506 [2021-05-06 12:06:38,033 INFO L87 Difference]: Start difference. First operand 372 states and 375 transitions. Second operand has 95 states, 95 states have (on average 3.8421052631578947) internal successors, (365), 94 states have internal predecessors, (365), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:54,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:54,466 INFO L93 Difference]: Finished difference Result 385 states and 393 transitions. [2021-05-06 12:06:54,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2021-05-06 12:06:54,466 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 95 states have (on average 3.8421052631578947) internal successors, (365), 94 states have internal predecessors, (365), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 369 [2021-05-06 12:06:54,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:54,467 INFO L225 Difference]: With dead ends: 385 [2021-05-06 12:06:54,467 INFO L226 Difference]: Without dead ends: 376 [2021-05-06 12:06:54,468 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 273 SyntacticMatches, 1 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4999 ImplicationChecksByTransitivity, 9360.5ms TimeCoverageRelationStatistics Valid=764, Invalid=35146, Unknown=0, NotChecked=0, Total=35910 [2021-05-06 12:06:54,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2021-05-06 12:06:54,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 376. [2021-05-06 12:06:54,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 376 states, 371 states have (on average 1.0107816711590296) internal successors, (375), 371 states have internal predecessors, (375), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:54,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 376 states to 376 states and 379 transitions. [2021-05-06 12:06:54,483 INFO L78 Accepts]: Start accepts. Automaton has 376 states and 379 transitions. Word has length 369 [2021-05-06 12:06:54,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:54,483 INFO L480 AbstractCegarLoop]: Abstraction has 376 states and 379 transitions. [2021-05-06 12:06:54,483 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 95 states, 95 states have (on average 3.8421052631578947) internal successors, (365), 94 states have internal predecessors, (365), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:54,483 INFO L276 IsEmpty]: Start isEmpty. Operand 376 states and 379 transitions. [2021-05-06 12:06:54,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 374 [2021-05-06 12:06:54,484 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:54,485 INFO L523 BasicCegarLoop]: trace histogram [91, 90, 90, 90, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:54,485 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable267 [2021-05-06 12:06:54,485 INFO L428 AbstractCegarLoop]: === Iteration 92 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:54,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:54,485 INFO L82 PathProgramCache]: Analyzing trace with hash -1988417699, now seen corresponding path program 90 times [2021-05-06 12:06:54,485 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:54,485 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [154437350] [2021-05-06 12:06:54,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:54,497 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:06:54,509 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:54,510 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:54,518 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:54,519 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:54,527 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:06:54,540 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:54,542 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:06:54,543 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:54,546 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:54,555 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:06:54,562 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:54,562 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:54,564 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:06:54,574 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:54,578 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:54,586 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:06:54,593 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:54,596 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:06:54,608 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:54,609 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:54,617 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:54,618 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:54,626 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:06:54,640 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:54,640 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:54,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:54,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:54,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:54,671 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:54,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:58,476 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:58,476 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [154437350] [2021-05-06 12:06:58,476 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [154437350] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:58,476 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:58,476 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [96] imperfect sequences [] total 96 [2021-05-06 12:06:58,476 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418732947] [2021-05-06 12:06:58,476 INFO L460 AbstractCegarLoop]: Interpolant automaton has 96 states [2021-05-06 12:06:58,476 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:58,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2021-05-06 12:06:58,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=9404, Unknown=0, NotChecked=0, Total=9702 [2021-05-06 12:06:58,477 INFO L87 Difference]: Start difference. First operand 376 states and 379 transitions. Second operand has 96 states, 96 states have (on average 3.84375) internal successors, (369), 95 states have internal predecessors, (369), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:15,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:15,333 INFO L93 Difference]: Finished difference Result 389 states and 397 transitions. [2021-05-06 12:07:15,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-05-06 12:07:15,334 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 96 states have (on average 3.84375) internal successors, (369), 95 states have internal predecessors, (369), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 373 [2021-05-06 12:07:15,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:15,335 INFO L225 Difference]: With dead ends: 389 [2021-05-06 12:07:15,335 INFO L226 Difference]: Without dead ends: 380 [2021-05-06 12:07:15,336 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 276 SyntacticMatches, 1 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5100 ImplicationChecksByTransitivity, 9097.9ms TimeCoverageRelationStatistics Valid=772, Invalid=35900, Unknown=0, NotChecked=0, Total=36672 [2021-05-06 12:07:15,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 380 states. [2021-05-06 12:07:15,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 380 to 380. [2021-05-06 12:07:15,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 380 states, 375 states have (on average 1.0106666666666666) internal successors, (379), 375 states have internal predecessors, (379), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:15,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 380 states to 380 states and 383 transitions. [2021-05-06 12:07:15,350 INFO L78 Accepts]: Start accepts. Automaton has 380 states and 383 transitions. Word has length 373 [2021-05-06 12:07:15,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:15,350 INFO L480 AbstractCegarLoop]: Abstraction has 380 states and 383 transitions. [2021-05-06 12:07:15,351 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 96 states, 96 states have (on average 3.84375) internal successors, (369), 95 states have internal predecessors, (369), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:15,351 INFO L276 IsEmpty]: Start isEmpty. Operand 380 states and 383 transitions. [2021-05-06 12:07:15,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 378 [2021-05-06 12:07:15,352 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:15,352 INFO L523 BasicCegarLoop]: trace histogram [92, 91, 91, 91, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:15,352 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable270 [2021-05-06 12:07:15,352 INFO L428 AbstractCegarLoop]: === Iteration 93 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:15,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:15,352 INFO L82 PathProgramCache]: Analyzing trace with hash -337709260, now seen corresponding path program 91 times [2021-05-06 12:07:15,352 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:15,352 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1444851391] [2021-05-06 12:07:15,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:15,358 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:07:15,371 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:15,372 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:15,379 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:15,380 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:15,388 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:07:15,402 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:15,404 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:07:15,404 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:15,408 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:07:15,416 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:07:15,423 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:15,424 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:15,425 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:07:15,430 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:15,434 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:07:15,438 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:07:15,444 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:15,447 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:07:15,460 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:15,461 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:15,468 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:15,470 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:15,478 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:07:15,492 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:15,493 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:15,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:15,520 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:15,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:15,522 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:15,524 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:19,286 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:19,286 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1444851391] [2021-05-06 12:07:19,286 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1444851391] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:19,286 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:19,286 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [97] imperfect sequences [] total 97 [2021-05-06 12:07:19,286 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382306419] [2021-05-06 12:07:19,287 INFO L460 AbstractCegarLoop]: Interpolant automaton has 97 states [2021-05-06 12:07:19,287 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:19,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-05-06 12:07:19,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=9599, Unknown=0, NotChecked=0, Total=9900 [2021-05-06 12:07:19,287 INFO L87 Difference]: Start difference. First operand 380 states and 383 transitions. Second operand has 97 states, 97 states have (on average 3.845360824742268) internal successors, (373), 96 states have internal predecessors, (373), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:36,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:36,247 INFO L93 Difference]: Finished difference Result 393 states and 401 transitions. [2021-05-06 12:07:36,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2021-05-06 12:07:36,248 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 3.845360824742268) internal successors, (373), 96 states have internal predecessors, (373), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 377 [2021-05-06 12:07:36,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:36,249 INFO L225 Difference]: With dead ends: 393 [2021-05-06 12:07:36,249 INFO L226 Difference]: Without dead ends: 384 [2021-05-06 12:07:36,250 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 473 GetRequests, 280 SyntacticMatches, 1 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5202 ImplicationChecksByTransitivity, 9076.0ms TimeCoverageRelationStatistics Valid=780, Invalid=36662, Unknown=0, NotChecked=0, Total=37442 [2021-05-06 12:07:36,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 384 states. [2021-05-06 12:07:36,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 384 to 384. [2021-05-06 12:07:36,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 384 states, 379 states have (on average 1.0105540897097625) internal successors, (383), 379 states have internal predecessors, (383), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:36,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 384 states to 384 states and 387 transitions. [2021-05-06 12:07:36,265 INFO L78 Accepts]: Start accepts. Automaton has 384 states and 387 transitions. Word has length 377 [2021-05-06 12:07:36,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:36,265 INFO L480 AbstractCegarLoop]: Abstraction has 384 states and 387 transitions. [2021-05-06 12:07:36,265 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 97 states, 97 states have (on average 3.845360824742268) internal successors, (373), 96 states have internal predecessors, (373), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:36,265 INFO L276 IsEmpty]: Start isEmpty. Operand 384 states and 387 transitions. [2021-05-06 12:07:36,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 382 [2021-05-06 12:07:36,266 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:36,266 INFO L523 BasicCegarLoop]: trace histogram [93, 92, 92, 92, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:36,267 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable273 [2021-05-06 12:07:36,267 INFO L428 AbstractCegarLoop]: === Iteration 94 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:36,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:36,267 INFO L82 PathProgramCache]: Analyzing trace with hash -711392373, now seen corresponding path program 92 times [2021-05-06 12:07:36,267 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:36,267 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [215019796] [2021-05-06 12:07:36,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:36,272 WARN L240 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size [2021-05-06 12:07:36,273 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:36,274 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:36,281 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:36,283 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:36,302 WARN L245 tifierPushTermWalker]: treesize reduction 16, result has 80.5 percent of original size 66 [2021-05-06 12:07:36,315 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:36,317 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:07:36,323 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:36,326 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:07:36,330 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:07:36,337 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:36,337 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:36,341 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:07:36,341 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:36,344 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:07:36,353 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:07:36,360 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:36,362 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:07:36,375 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:36,376 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:36,382 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:36,384 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:36,392 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:07:36,405 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 12:07:36,406 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:36,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:36,449 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:36,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:36,451 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:36,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:40,498 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:40,498 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [215019796] [2021-05-06 12:07:40,498 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [215019796] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:40,498 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:40,498 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [101] imperfect sequences [] total 101 [2021-05-06 12:07:40,498 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637012892] [2021-05-06 12:07:40,498 INFO L460 AbstractCegarLoop]: Interpolant automaton has 101 states [2021-05-06 12:07:40,499 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:40,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2021-05-06 12:07:40,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=10401, Unknown=0, NotChecked=0, Total=10712 [2021-05-06 12:07:40,499 INFO L87 Difference]: Start difference. First operand 384 states and 387 transitions. Second operand has 101 states, 100 states have (on average 3.77) internal successors, (377), 99 states have internal predecessors, (377), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)