/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_3.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 11:55:38,945 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 11:55:38,946 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 11:55:38,971 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 11:55:39,020 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 11:55:39,042 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 11:55:39,046 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 11:55:39,047 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 11:55:39,058 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 11:55:39,058 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 11:55:39,059 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 11:55:39,059 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 11:55:39,060 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 11:55:39,060 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 11:55:39,060 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 11:55:39,060 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 11:55:39,060 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 11:55:39,060 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 11:55:39,060 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 11:55:39,061 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 11:55:39,061 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 11:55:39,061 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 11:55:39,061 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 11:55:39,061 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 11:55:39,061 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 11:55:39,061 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 11:55:39,061 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:55:39,062 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 11:55:39,062 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 11:55:39,062 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 11:55:39,062 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 11:55:39,062 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 11:55:39,311 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 11:55:39,327 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 11:55:39,329 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 11:55:39,329 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 11:55:39,330 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 11:55:39,331 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_3.c [2021-05-06 11:55:39,387 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/33301ee77/49a6a5aa32b74bd291bf9bb4b0ecd59e/FLAG042d891a2 [2021-05-06 11:55:39,787 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 11:55:39,788 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_3.c [2021-05-06 11:55:39,792 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/33301ee77/49a6a5aa32b74bd291bf9bb4b0ecd59e/FLAG042d891a2 [2021-05-06 11:55:40,180 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/33301ee77/49a6a5aa32b74bd291bf9bb4b0ecd59e [2021-05-06 11:55:40,182 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 11:55:40,183 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 11:55:40,184 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 11:55:40,185 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 11:55:40,193 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 11:55:40,193 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:55:40" (1/1) ... [2021-05-06 11:55:40,194 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@70035c71 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:40, skipping insertion in model container [2021-05-06 11:55:40,194 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:55:40" (1/1) ... [2021-05-06 11:55:40,199 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 11:55:40,209 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 11:55:40,331 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_3.c[318,331] [2021-05-06 11:55:40,342 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:55:40,348 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 11:55:40,357 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_3.c[318,331] [2021-05-06 11:55:40,360 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:55:40,409 INFO L208 MainTranslator]: Completed translation [2021-05-06 11:55:40,410 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:40 WrapperNode [2021-05-06 11:55:40,410 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 11:55:40,411 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 11:55:40,411 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 11:55:40,411 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 11:55:40,419 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:40" (1/1) ... [2021-05-06 11:55:40,420 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:40" (1/1) ... [2021-05-06 11:55:40,424 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:40" (1/1) ... [2021-05-06 11:55:40,424 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:40" (1/1) ... [2021-05-06 11:55:40,435 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:40" (1/1) ... [2021-05-06 11:55:40,440 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:40" (1/1) ... [2021-05-06 11:55:40,442 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:40" (1/1) ... [2021-05-06 11:55:40,447 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 11:55:40,447 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 11:55:40,447 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 11:55:40,448 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 11:55:40,448 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:40" (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 11:55:40,528 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 11:55:40,529 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 11:55:40,529 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 11:55:40,529 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 11:55:40,529 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 11:55:40,530 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 11:55:40,530 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 11:55:40,530 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 11:55:40,530 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 11:55:40,531 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 11:55:40,531 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 11:55:40,531 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 11:55:40,531 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 11:55:40,531 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 11:55:40,532 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 11:55:40,532 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 11:55:40,532 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 11:55:40,747 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 11:55:40,747 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 11:55:40,748 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:55:40 BoogieIcfgContainer [2021-05-06 11:55:40,748 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 11:55:40,749 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 11:55:40,749 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 11:55:40,751 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 11:55:40,751 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 11:55:40" (1/3) ... [2021-05-06 11:55:40,752 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@eb39428 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:55:40, skipping insertion in model container [2021-05-06 11:55:40,752 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:40" (2/3) ... [2021-05-06 11:55:40,752 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@eb39428 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:55:40, skipping insertion in model container [2021-05-06 11:55:40,752 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:55:40" (3/3) ... [2021-05-06 11:55:40,753 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_3.c [2021-05-06 11:55:40,757 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 11:55:40,759 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 11:55:40,774 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 11:55:40,790 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 11:55:40,790 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 11:55:40,791 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 11:55:40,791 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 11:55:40,791 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 11:55:40,791 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 11:55:40,791 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 11:55:40,791 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 11:55:40,802 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:55:40,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 11:55:40,807 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:40,807 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:40,807 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:40,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:40,811 INFO L82 PathProgramCache]: Analyzing trace with hash -1168619535, now seen corresponding path program 1 times [2021-05-06 11:55:40,823 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:40,823 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [555033712] [2021-05-06 11:55:40,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:40,870 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:55:40,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:40,960 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:40,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:40,972 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 11:55:40,973 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:40,973 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [555033712] [2021-05-06 11:55:40,974 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [555033712] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:40,974 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:40,975 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 11:55:40,975 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [650313447] [2021-05-06 11:55:40,977 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 11:55:40,977 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:40,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 11:55:40,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:55:40,995 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:41,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:41,073 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2021-05-06 11:55:41,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 11:55:41,074 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-06 11:55:41,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:41,078 INFO L225 Difference]: With dead ends: 34 [2021-05-06 11:55:41,078 INFO L226 Difference]: Without dead ends: 14 [2021-05-06 11:55:41,080 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 30.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:55:41,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-06 11:55:41,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-06 11:55:41,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:41,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2021-05-06 11:55:41,108 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 12 [2021-05-06 11:55:41,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:41,108 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2021-05-06 11:55:41,108 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:41,109 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2021-05-06 11:55:41,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 11:55:41,109 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:41,109 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:41,109 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 11:55:41,110 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:41,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:41,110 INFO L82 PathProgramCache]: Analyzing trace with hash -1458605129, now seen corresponding path program 1 times [2021-05-06 11:55:41,110 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:41,111 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [333338744] [2021-05-06 11:55:41,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:41,113 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:55:41,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:41,198 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:41,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:41,219 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:41,220 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:41,220 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [333338744] [2021-05-06 11:55:41,220 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [333338744] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:41,220 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:41,220 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 11:55:41,220 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [248330936] [2021-05-06 11:55:41,221 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 11:55:41,221 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:41,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 11:55:41,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 11:55:41,222 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:41,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:41,297 INFO L93 Difference]: Finished difference Result 24 states and 30 transitions. [2021-05-06 11:55:41,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 11:55:41,305 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-06 11:55:41,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:41,306 INFO L225 Difference]: With dead ends: 24 [2021-05-06 11:55:41,306 INFO L226 Difference]: Without dead ends: 16 [2021-05-06 11:55:41,307 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 74.1ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:55:41,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-05-06 11:55:41,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-05-06 11:55:41,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:41,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-05-06 11:55:41,314 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 12 [2021-05-06 11:55:41,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:41,314 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-05-06 11:55:41,315 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:41,315 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-05-06 11:55:41,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-06 11:55:41,315 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:41,315 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:41,316 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 11:55:41,316 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:41,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:41,316 INFO L82 PathProgramCache]: Analyzing trace with hash -1316432198, now seen corresponding path program 1 times [2021-05-06 11:55:41,316 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:41,317 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1381170161] [2021-05-06 11:55:41,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:41,351 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:41,366 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:41,378 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:41,390 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:41,401 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:41,403 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:55:41,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:41,445 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:41,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:41,461 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:41,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:41,491 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:41,491 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1381170161] [2021-05-06 11:55:41,491 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1381170161] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:41,491 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:41,491 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 11:55:41,491 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1881746219] [2021-05-06 11:55:41,492 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 11:55:41,492 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:41,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 11:55:41,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:55:41,492 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:41,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:41,620 INFO L93 Difference]: Finished difference Result 26 states and 32 transitions. [2021-05-06 11:55:41,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 11:55:41,621 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-06 11:55:41,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:41,621 INFO L225 Difference]: With dead ends: 26 [2021-05-06 11:55:41,622 INFO L226 Difference]: Without dead ends: 20 [2021-05-06 11:55:41,622 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 114.5ms TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:55:41,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-06 11:55:41,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-05-06 11:55:41,632 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 11:55:41,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2021-05-06 11:55:41,634 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 14 [2021-05-06 11:55:41,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:41,635 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2021-05-06 11:55:41,635 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:41,635 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2021-05-06 11:55:41,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-06 11:55:41,635 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:41,636 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:41,636 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 11:55:41,636 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:41,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:41,637 INFO L82 PathProgramCache]: Analyzing trace with hash -1342594849, now seen corresponding path program 1 times [2021-05-06 11:55:41,637 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:41,637 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [521316569] [2021-05-06 11:55:41,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:41,672 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:41,709 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:41,720 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:41,734 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:41,738 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:41,750 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:41,765 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:41,778 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:41,790 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:41,800 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:41,807 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:41,816 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 11:55:41,817 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:41,823 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:41,855 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:41,861 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:41,870 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:41,879 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:41,893 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:41,928 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:41,940 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:41,958 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:41,960 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:41,973 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:41,992 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:41,997 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:42,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:42,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:42,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:42,071 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:42,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:42,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:42,141 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:42,141 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [521316569] [2021-05-06 11:55:42,141 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [521316569] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:42,141 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:42,141 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:55:42,141 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411191727] [2021-05-06 11:55:42,142 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:55:42,142 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:42,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:55:42,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:55:42,143 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:42,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:42,374 INFO L93 Difference]: Finished difference Result 37 states and 48 transitions. [2021-05-06 11:55:42,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:55:42,375 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-06 11:55:42,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:42,377 INFO L225 Difference]: With dead ends: 37 [2021-05-06 11:55:42,377 INFO L226 Difference]: Without dead ends: 25 [2021-05-06 11:55:42,378 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 208.4ms TimeCoverageRelationStatistics Valid=75, Invalid=135, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:55:42,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-06 11:55:42,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-05-06 11:55:42,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.2) internal successors, (24), 20 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:42,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-05-06 11:55:42,387 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 19 [2021-05-06 11:55:42,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:42,387 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-05-06 11:55:42,388 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 8 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:42,388 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-05-06 11:55:42,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-06 11:55:42,388 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:42,388 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:42,389 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-06 11:55:42,389 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:42,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:42,390 INFO L82 PathProgramCache]: Analyzing trace with hash 1246825262, now seen corresponding path program 2 times [2021-05-06 11:55:42,390 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:42,392 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1404358365] [2021-05-06 11:55:42,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:42,409 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:42,410 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:42,414 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:42,424 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:42,426 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:42,456 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:42,475 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:42,483 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:42,484 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:42,489 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:42,520 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:42,529 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:42,540 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:42,543 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:42,544 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:42,549 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:42,569 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:42,577 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:42,584 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:42,588 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:42,590 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:42,600 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:42,602 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:42,641 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:42,655 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:42,657 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:42,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:42,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:42,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:42,718 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:42,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:42,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:42,799 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:42,799 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1404358365] [2021-05-06 11:55:42,799 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1404358365] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:42,799 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:42,799 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 11:55:42,799 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111060642] [2021-05-06 11:55:42,800 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 11:55:42,800 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:42,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 11:55:42,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:55:42,801 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:43,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:43,086 INFO L93 Difference]: Finished difference Result 47 states and 58 transitions. [2021-05-06 11:55:43,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 11:55:43,087 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2021-05-06 11:55:43,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:43,089 INFO L225 Difference]: With dead ends: 47 [2021-05-06 11:55:43,089 INFO L226 Difference]: Without dead ends: 30 [2021-05-06 11:55:43,090 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 273.3ms TimeCoverageRelationStatistics Valid=135, Invalid=285, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:55:43,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-06 11:55:43,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-06 11:55:43,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.16) internal successors, (29), 25 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:43,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2021-05-06 11:55:43,100 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 24 [2021-05-06 11:55:43,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:43,101 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2021-05-06 11:55:43,101 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:43,101 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2021-05-06 11:55:43,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-06 11:55:43,101 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:43,101 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:43,102 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-06 11:55:43,102 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:43,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:43,102 INFO L82 PathProgramCache]: Analyzing trace with hash -319242389, now seen corresponding path program 3 times [2021-05-06 11:55:43,102 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:43,102 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [135602845] [2021-05-06 11:55:43,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:43,116 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:43,118 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:43,122 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:43,132 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:43,134 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:43,161 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:43,175 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:43,182 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:43,183 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:43,187 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:43,214 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:43,220 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:43,221 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:43,227 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:43,228 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:43,233 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:43,243 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:43,250 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:43,257 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:43,258 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:43,261 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:43,288 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:43,293 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:43,314 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:43,327 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 11:55:43,329 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:43,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:43,389 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:43,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:43,396 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:43,398 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:43,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:43,508 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:43,509 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [135602845] [2021-05-06 11:55:43,509 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [135602845] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:43,509 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:43,509 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:55:43,509 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205621243] [2021-05-06 11:55:43,509 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:55:43,509 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:43,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:55:43,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:55:43,510 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 14 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:43,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:43,931 INFO L93 Difference]: Finished difference Result 57 states and 68 transitions. [2021-05-06 11:55:43,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:55:43,932 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 14 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-06 11:55:43,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:43,932 INFO L225 Difference]: With dead ends: 57 [2021-05-06 11:55:43,932 INFO L226 Difference]: Without dead ends: 35 [2021-05-06 11:55:43,933 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 399.0ms TimeCoverageRelationStatistics Valid=210, Invalid=492, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:55:43,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-06 11:55:43,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-06 11:55:43,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 30 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:43,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2021-05-06 11:55:43,937 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 29 [2021-05-06 11:55:43,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:43,937 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2021-05-06 11:55:43,937 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 14 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:43,938 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2021-05-06 11:55:43,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 11:55:43,938 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:43,938 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:43,938 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-06 11:55:43,938 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:43,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:43,939 INFO L82 PathProgramCache]: Analyzing trace with hash 951830946, now seen corresponding path program 4 times [2021-05-06 11:55:43,939 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:43,939 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1479257337] [2021-05-06 11:55:43,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:43,948 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:43,949 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:43,953 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:43,965 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:43,967 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:43,990 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:44,004 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:44,007 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:44,015 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:44,019 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:44,024 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:44,031 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:44,031 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:44,046 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:44,047 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:44,050 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:44,063 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:44,070 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:44,081 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:44,095 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:44,097 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:44,107 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:44,110 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:44,120 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:44,134 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:44,136 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:44,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:44,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:44,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:44,221 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:44,222 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:44,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:44,338 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:44,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1479257337] [2021-05-06 11:55:44,338 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1479257337] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:44,338 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:44,338 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:55:44,338 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083915631] [2021-05-06 11:55:44,339 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:55:44,339 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:44,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:55:44,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=204, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:55:44,339 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand has 18 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 17 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:44,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:44,877 INFO L93 Difference]: Finished difference Result 67 states and 78 transitions. [2021-05-06 11:55:44,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 11:55:44,878 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 17 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-06 11:55:44,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:44,879 INFO L225 Difference]: With dead ends: 67 [2021-05-06 11:55:44,879 INFO L226 Difference]: Without dead ends: 40 [2021-05-06 11:55:44,879 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 495.2ms TimeCoverageRelationStatistics Valid=300, Invalid=756, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:55:44,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-06 11:55:44,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-05-06 11:55:44,884 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 11:55:44,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2021-05-06 11:55:44,884 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 34 [2021-05-06 11:55:44,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:44,884 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2021-05-06 11:55:44,885 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 17 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:44,885 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2021-05-06 11:55:44,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-06 11:55:44,885 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:44,885 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:44,886 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-06 11:55:44,886 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:44,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:44,886 INFO L82 PathProgramCache]: Analyzing trace with hash 601551863, now seen corresponding path program 5 times [2021-05-06 11:55:44,886 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:44,886 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [474468716] [2021-05-06 11:55:44,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:44,893 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:44,908 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:44,910 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:44,922 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:44,924 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:44,934 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:44,948 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:44,953 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:44,954 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:44,958 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:44,968 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:44,975 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:44,978 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:44,980 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:44,986 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:44,990 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:44,994 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:45,001 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:45,006 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:45,021 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:45,024 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:45,033 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:45,035 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:45,044 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:45,057 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:45,059 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:45,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:45,112 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:45,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:45,117 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:45,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:45,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:45,320 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:45,320 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [474468716] [2021-05-06 11:55:45,320 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [474468716] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:45,320 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:45,320 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:55:45,320 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [193830487] [2021-05-06 11:55:45,320 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:55:45,321 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:45,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:55:45,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=283, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:55:45,322 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 21 states, 21 states have (on average 1.6666666666666667) internal successors, (35), 20 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:45,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:45,992 INFO L93 Difference]: Finished difference Result 77 states and 88 transitions. [2021-05-06 11:55:45,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:55:45,992 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.6666666666666667) internal successors, (35), 20 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2021-05-06 11:55:45,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:45,993 INFO L225 Difference]: With dead ends: 77 [2021-05-06 11:55:45,993 INFO L226 Difference]: Without dead ends: 45 [2021-05-06 11:55:46,008 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 354 ImplicationChecksByTransitivity, 649.3ms TimeCoverageRelationStatistics Valid=405, Invalid=1077, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 11:55:46,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-06 11:55:46,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-05-06 11:55:46,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.1) internal successors, (44), 40 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:46,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2021-05-06 11:55:46,014 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 39 [2021-05-06 11:55:46,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:46,014 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2021-05-06 11:55:46,014 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.6666666666666667) internal successors, (35), 20 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:46,014 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2021-05-06 11:55:46,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-06 11:55:46,015 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:46,015 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:46,015 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-06 11:55:46,015 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:46,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:46,015 INFO L82 PathProgramCache]: Analyzing trace with hash -2144480746, now seen corresponding path program 6 times [2021-05-06 11:55:46,015 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:46,015 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1376515407] [2021-05-06 11:55:46,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:46,022 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:46,023 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:46,025 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:46,035 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:46,037 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:46,064 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:46,079 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:46,085 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:46,086 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:46,090 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:46,105 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:46,113 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:46,114 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:46,116 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:46,116 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:46,121 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:46,137 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:46,146 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 11:55:46,151 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:46,152 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:46,153 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:46,162 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:46,165 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:46,187 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:46,203 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:46,204 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:46,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:46,266 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:46,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:46,281 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:46,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:46,283 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:46,514 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:46,514 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1376515407] [2021-05-06 11:55:46,514 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1376515407] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:46,514 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:46,514 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:55:46,514 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470386038] [2021-05-06 11:55:46,515 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:55:46,515 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:46,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:55:46,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=375, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:55:46,516 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand has 24 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 23 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:47,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:47,328 INFO L93 Difference]: Finished difference Result 87 states and 98 transitions. [2021-05-06 11:55:47,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 11:55:47,329 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 23 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2021-05-06 11:55:47,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:47,329 INFO L225 Difference]: With dead ends: 87 [2021-05-06 11:55:47,329 INFO L226 Difference]: Without dead ends: 50 [2021-05-06 11:55:47,330 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 487 ImplicationChecksByTransitivity, 775.0ms TimeCoverageRelationStatistics Valid=525, Invalid=1455, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 11:55:47,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-06 11:55:47,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-05-06 11:55:47,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.0888888888888888) internal successors, (49), 45 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:47,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 53 transitions. [2021-05-06 11:55:47,335 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 53 transitions. Word has length 44 [2021-05-06 11:55:47,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:47,335 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 53 transitions. [2021-05-06 11:55:47,336 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.6666666666666667) internal successors, (40), 23 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:47,336 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 53 transitions. [2021-05-06 11:55:47,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 11:55:47,336 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:47,336 INFO L523 BasicCegarLoop]: trace histogram [15, 14, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:47,336 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-05-06 11:55:47,336 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:47,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:47,337 INFO L82 PathProgramCache]: Analyzing trace with hash 266043011, now seen corresponding path program 7 times [2021-05-06 11:55:47,337 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:47,337 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1211053572] [2021-05-06 11:55:47,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:47,345 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:47,361 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,364 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,371 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:47,374 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:47,386 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:47,401 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 11:55:47,406 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:47,407 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,413 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:47,425 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:47,433 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:47,434 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:47,444 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:47,445 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,450 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:47,461 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:47,468 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:47,473 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:47,474 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,476 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,486 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:47,489 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:47,519 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:47,538 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:47,539 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:47,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:47,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:47,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:47,631 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:47,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:47,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:47,904 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:47,904 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1211053572] [2021-05-06 11:55:47,905 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1211053572] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:47,905 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:47,905 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 11:55:47,905 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659737499] [2021-05-06 11:55:47,905 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 11:55:47,905 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:47,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 11:55:47,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=480, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:55:47,906 INFO L87 Difference]: Start difference. First operand 50 states and 53 transitions. Second operand has 27 states, 27 states have (on average 1.6666666666666667) internal successors, (45), 26 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:48,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:48,888 INFO L93 Difference]: Finished difference Result 97 states and 108 transitions. [2021-05-06 11:55:48,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 11:55:48,888 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.6666666666666667) internal successors, (45), 26 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-05-06 11:55:48,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:48,889 INFO L225 Difference]: With dead ends: 97 [2021-05-06 11:55:48,889 INFO L226 Difference]: Without dead ends: 55 [2021-05-06 11:55:48,890 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 641 ImplicationChecksByTransitivity, 969.3ms TimeCoverageRelationStatistics Valid=660, Invalid=1890, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 11:55:48,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-06 11:55:48,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-06 11:55:48,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.08) internal successors, (54), 50 states have internal predecessors, (54), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:48,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2021-05-06 11:55:48,895 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 49 [2021-05-06 11:55:48,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:48,895 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2021-05-06 11:55:48,895 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 1.6666666666666667) internal successors, (45), 26 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:48,895 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2021-05-06 11:55:48,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-06 11:55:48,895 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:48,896 INFO L523 BasicCegarLoop]: trace histogram [17, 16, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:48,896 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-05-06 11:55:48,896 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:48,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:48,896 INFO L82 PathProgramCache]: Analyzing trace with hash 2144068746, now seen corresponding path program 8 times [2021-05-06 11:55:48,896 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:48,896 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1401910065] [2021-05-06 11:55:48,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:48,903 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:48,904 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:48,907 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:48,915 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:48,917 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:48,945 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:48,960 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:48,965 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:48,966 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:48,971 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:48,985 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:48,994 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:48,995 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:48,997 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:48,998 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:49,004 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:49,017 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:49,026 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:49,031 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:49,032 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:49,034 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:49,043 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:49,045 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:49,068 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:49,083 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 11:55:49,085 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:49,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:49,254 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:49,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:49,258 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:49,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:49,567 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:49,567 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1401910065] [2021-05-06 11:55:49,567 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1401910065] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:49,567 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:49,567 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 11:55:49,567 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663348158] [2021-05-06 11:55:49,568 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 11:55:49,568 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:49,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 11:55:49,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=735, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:55:49,569 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand has 30 states, 30 states have (on average 1.6666666666666667) internal successors, (50), 29 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:50,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:50,808 INFO L93 Difference]: Finished difference Result 137 states and 148 transitions. [2021-05-06 11:55:50,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 11:55:50,809 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.6666666666666667) internal successors, (50), 29 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 54 [2021-05-06 11:55:50,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:50,810 INFO L225 Difference]: With dead ends: 137 [2021-05-06 11:55:50,810 INFO L226 Difference]: Without dead ends: 90 [2021-05-06 11:55:50,811 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 995 ImplicationChecksByTransitivity, 1209.0ms TimeCoverageRelationStatistics Valid=864, Invalid=2676, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 11:55:50,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-06 11:55:50,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2021-05-06 11:55:50,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 85 states have (on average 1.0588235294117647) internal successors, (90), 85 states have internal predecessors, (90), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:50,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 94 transitions. [2021-05-06 11:55:50,833 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 94 transitions. Word has length 54 [2021-05-06 11:55:50,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:50,833 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 94 transitions. [2021-05-06 11:55:50,833 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 1.6666666666666667) internal successors, (50), 29 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:50,833 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 94 transitions. [2021-05-06 11:55:50,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-06 11:55:50,834 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:50,834 INFO L523 BasicCegarLoop]: trace histogram [18, 17, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:50,834 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-05-06 11:55:50,834 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:50,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:50,834 INFO L82 PathProgramCache]: Analyzing trace with hash 1792027892, now seen corresponding path program 9 times [2021-05-06 11:55:50,835 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:50,835 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [948597686] [2021-05-06 11:55:50,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:50,843 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:50,858 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:50,860 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:50,871 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:50,873 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:50,881 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:50,897 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:50,900 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:50,900 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:50,905 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:50,915 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:50,922 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:50,923 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:50,925 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:50,931 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:50,935 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:50,939 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:50,947 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:50,950 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:50,964 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 11:55:50,979 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:50,988 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:51,001 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:51,004 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:51,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:51,132 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:51,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:51,145 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:51,146 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:51,440 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:51,440 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [948597686] [2021-05-06 11:55:51,440 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [948597686] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:51,440 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:51,440 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2021-05-06 11:55:51,440 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1416894897] [2021-05-06 11:55:51,440 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-06 11:55:51,441 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:51,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-06 11:55:51,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=824, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 11:55:51,441 INFO L87 Difference]: Start difference. First operand 90 states and 94 transitions. Second operand has 32 states, 32 states have (on average 1.65625) internal successors, (53), 31 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:52,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:52,748 INFO L93 Difference]: Finished difference Result 141 states and 151 transitions. [2021-05-06 11:55:52,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-06 11:55:52,749 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.65625) internal successors, (53), 31 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2021-05-06 11:55:52,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:52,749 INFO L225 Difference]: With dead ends: 141 [2021-05-06 11:55:52,749 INFO L226 Difference]: Without dead ends: 93 [2021-05-06 11:55:52,750 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1146 ImplicationChecksByTransitivity, 1225.0ms TimeCoverageRelationStatistics Valid=993, Invalid=3039, Unknown=0, NotChecked=0, Total=4032 [2021-05-06 11:55:52,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-06 11:55:52,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2021-05-06 11:55:52,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 88 states have (on average 1.0568181818181819) internal successors, (93), 88 states have internal predecessors, (93), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:52,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 97 transitions. [2021-05-06 11:55:52,758 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 97 transitions. Word has length 57 [2021-05-06 11:55:52,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:52,758 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 97 transitions. [2021-05-06 11:55:52,758 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.65625) internal successors, (53), 31 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:52,758 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 97 transitions. [2021-05-06 11:55:52,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-06 11:55:52,759 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:52,759 INFO L523 BasicCegarLoop]: trace histogram [19, 18, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:52,759 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-05-06 11:55:52,759 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:52,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:52,759 INFO L82 PathProgramCache]: Analyzing trace with hash 844924468, now seen corresponding path program 10 times [2021-05-06 11:55:52,759 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:52,759 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2047497025] [2021-05-06 11:55:52,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:52,765 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:52,777 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:52,782 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:52,791 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:52,792 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:52,800 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:52,813 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:52,820 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:52,831 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:52,835 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:52,839 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:52,846 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:52,846 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:52,848 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:52,849 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:52,858 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:52,868 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:52,875 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:52,878 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:52,892 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:52,894 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:52,904 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:52,907 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:52,916 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:52,930 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:52,931 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:52,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:53,067 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:53,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:53,073 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:53,075 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:53,410 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:53,410 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2047497025] [2021-05-06 11:55:53,410 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2047497025] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:53,410 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:53,410 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2021-05-06 11:55:53,410 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [731990869] [2021-05-06 11:55:53,410 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-06 11:55:53,410 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:53,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-06 11:55:53,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=414, Invalid=918, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 11:55:53,411 INFO L87 Difference]: Start difference. First operand 93 states and 97 transitions. Second operand has 34 states, 34 states have (on average 1.6470588235294117) internal successors, (56), 33 states have internal predecessors, (56), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:54,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:54,787 INFO L93 Difference]: Finished difference Result 145 states and 155 transitions. [2021-05-06 11:55:54,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-06 11:55:54,788 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.6470588235294117) internal successors, (56), 33 states have internal predecessors, (56), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 60 [2021-05-06 11:55:54,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:54,788 INFO L225 Difference]: With dead ends: 145 [2021-05-06 11:55:54,789 INFO L226 Difference]: Without dead ends: 96 [2021-05-06 11:55:54,790 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1307 ImplicationChecksByTransitivity, 1339.8ms TimeCoverageRelationStatistics Valid=1131, Invalid=3425, Unknown=0, NotChecked=0, Total=4556 [2021-05-06 11:55:54,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-06 11:55:54,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2021-05-06 11:55:54,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 91 states have (on average 1.054945054945055) internal successors, (96), 91 states have internal predecessors, (96), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:54,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 100 transitions. [2021-05-06 11:55:54,797 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 100 transitions. Word has length 60 [2021-05-06 11:55:54,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:54,797 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 100 transitions. [2021-05-06 11:55:54,797 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.6470588235294117) internal successors, (56), 33 states have internal predecessors, (56), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:54,797 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 100 transitions. [2021-05-06 11:55:54,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-06 11:55:54,798 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:54,798 INFO L523 BasicCegarLoop]: trace histogram [20, 19, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:54,798 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-05-06 11:55:54,798 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:54,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:54,798 INFO L82 PathProgramCache]: Analyzing trace with hash 1013674058, now seen corresponding path program 11 times [2021-05-06 11:55:54,798 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:54,798 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1453527302] [2021-05-06 11:55:54,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:54,810 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:54,811 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:54,813 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:54,820 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:54,821 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:54,840 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:54,854 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:54,858 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:54,864 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:54,872 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:54,877 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:54,884 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:54,885 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:54,886 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:54,887 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:54,892 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:54,901 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:54,908 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:54,911 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:54,926 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:54,927 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:54,939 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:54,941 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:54,949 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:54,963 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:54,964 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:54,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:55,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:55,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:55,075 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:55,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:55,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:55,427 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:55,427 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1453527302] [2021-05-06 11:55:55,427 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1453527302] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:55,427 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:55,427 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 11:55:55,427 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523254100] [2021-05-06 11:55:55,428 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 11:55:55,428 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:55,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 11:55:55,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=407, Invalid=853, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 11:55:55,428 INFO L87 Difference]: Start difference. First operand 96 states and 100 transitions. Second operand has 36 states, 36 states have (on average 1.6388888888888888) internal successors, (59), 35 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:56,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:56,846 INFO L93 Difference]: Finished difference Result 157 states and 175 transitions. [2021-05-06 11:55:56,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 11:55:56,848 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.6388888888888888) internal successors, (59), 35 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 63 [2021-05-06 11:55:56,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:56,849 INFO L225 Difference]: With dead ends: 157 [2021-05-06 11:55:56,849 INFO L226 Difference]: Without dead ends: 107 [2021-05-06 11:55:56,850 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1263 ImplicationChecksByTransitivity, 1378.5ms TimeCoverageRelationStatistics Valid=1215, Invalid=3477, Unknown=0, NotChecked=0, Total=4692 [2021-05-06 11:55:56,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-05-06 11:55:56,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 69. [2021-05-06 11:55:56,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.0625) internal successors, (68), 64 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:56,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2021-05-06 11:55:56,856 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 63 [2021-05-06 11:55:56,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:56,856 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2021-05-06 11:55:56,856 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 1.6388888888888888) internal successors, (59), 35 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:56,856 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2021-05-06 11:55:56,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-06 11:55:56,857 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:56,857 INFO L523 BasicCegarLoop]: trace histogram [22, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:56,857 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-05-06 11:55:56,857 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:56,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:56,857 INFO L82 PathProgramCache]: Analyzing trace with hash 1957732899, now seen corresponding path program 12 times [2021-05-06 11:55:56,857 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:56,857 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [144039649] [2021-05-06 11:55:56,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:56,867 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:56,887 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:56,889 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:56,899 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:56,902 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:56,912 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:56,929 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:56,936 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:56,944 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:56,951 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:56,957 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:56,965 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:56,966 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:56,968 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:56,974 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:56,979 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:56,983 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:57,000 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:57,004 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:57,004 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:57,007 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:57,015 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:57,017 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:57,037 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:57,056 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 11:55:57,057 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:57,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:57,184 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:57,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:57,190 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:57,190 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:57,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:57,624 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:57,624 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [144039649] [2021-05-06 11:55:57,624 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [144039649] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:57,624 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:57,624 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 11:55:57,624 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606423460] [2021-05-06 11:55:57,625 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 11:55:57,625 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:57,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 11:55:57,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=474, Invalid=1008, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 11:55:57,625 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand has 39 states, 39 states have (on average 1.641025641025641) internal successors, (64), 38 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:59,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:59,205 INFO L93 Difference]: Finished difference Result 135 states and 146 transitions. [2021-05-06 11:55:59,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 11:55:59,206 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.641025641025641) internal successors, (64), 38 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 68 [2021-05-06 11:55:59,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:59,206 INFO L225 Difference]: With dead ends: 135 [2021-05-06 11:55:59,206 INFO L226 Difference]: Without dead ends: 74 [2021-05-06 11:55:59,208 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1504 ImplicationChecksByTransitivity, 1531.1ms TimeCoverageRelationStatistics Valid=1416, Invalid=4134, Unknown=0, NotChecked=0, Total=5550 [2021-05-06 11:55:59,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-06 11:55:59,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2021-05-06 11:55:59,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 69 states have (on average 1.0579710144927537) internal successors, (73), 69 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:59,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 77 transitions. [2021-05-06 11:55:59,214 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 77 transitions. Word has length 68 [2021-05-06 11:55:59,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:59,214 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 77 transitions. [2021-05-06 11:55:59,214 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.641025641025641) internal successors, (64), 38 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:59,214 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 77 transitions. [2021-05-06 11:55:59,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 11:55:59,214 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:59,215 INFO L523 BasicCegarLoop]: trace histogram [24, 23, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:59,215 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-05-06 11:55:59,215 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:59,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:59,215 INFO L82 PathProgramCache]: Analyzing trace with hash 649604630, now seen corresponding path program 13 times [2021-05-06 11:55:59,215 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:59,215 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1050854738] [2021-05-06 11:55:59,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:59,223 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:59,223 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:59,226 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:59,238 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:59,240 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:59,259 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:59,273 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:59,286 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:59,290 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:59,294 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:59,304 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:59,312 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:59,313 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:59,315 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:59,321 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:59,325 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:59,329 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:59,336 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 11:55:59,343 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:59,358 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:59,363 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:59,372 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:59,373 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:59,381 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:59,394 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:59,395 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:59,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:59,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:59,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:59,591 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:59,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:00,037 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:00,037 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1050854738] [2021-05-06 11:56:00,037 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1050854738] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:00,037 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:00,037 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-06 11:56:00,038 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247343188] [2021-05-06 11:56:00,038 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 11:56:00,038 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:00,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 11:56:00,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=612, Invalid=1368, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 11:56:00,039 INFO L87 Difference]: Start difference. First operand 74 states and 77 transitions. Second operand has 42 states, 42 states have (on average 1.6428571428571428) internal successors, (69), 41 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 11:56:01,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:01,924 INFO L93 Difference]: Finished difference Result 189 states and 200 transitions. [2021-05-06 11:56:01,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-06 11:56:01,925 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.6428571428571428) internal successors, (69), 41 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 11:56:01,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:01,925 INFO L225 Difference]: With dead ends: 189 [2021-05-06 11:56:01,925 INFO L226 Difference]: Without dead ends: 123 [2021-05-06 11:56:01,927 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2021 ImplicationChecksByTransitivity, 1809.7ms TimeCoverageRelationStatistics Valid=1703, Invalid=5269, Unknown=0, NotChecked=0, Total=6972 [2021-05-06 11:56:01,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-05-06 11:56:01,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 123. [2021-05-06 11:56:01,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 118 states have (on average 1.0423728813559323) internal successors, (123), 118 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 11:56:01,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 127 transitions. [2021-05-06 11:56:01,935 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 127 transitions. Word has length 73 [2021-05-06 11:56:01,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:01,935 INFO L480 AbstractCegarLoop]: Abstraction has 123 states and 127 transitions. [2021-05-06 11:56:01,936 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 1.6428571428571428) internal successors, (69), 41 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 11:56:01,936 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 127 transitions. [2021-05-06 11:56:01,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 11:56:01,936 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:01,936 INFO L523 BasicCegarLoop]: trace histogram [25, 24, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:01,936 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-05-06 11:56:01,936 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:01,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:01,937 INFO L82 PathProgramCache]: Analyzing trace with hash 1333493586, now seen corresponding path program 14 times [2021-05-06 11:56:01,937 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:01,937 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2057392270] [2021-05-06 11:56:01,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:01,950 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:01,963 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:01,965 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:01,972 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:01,974 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:01,982 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:01,996 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:01,999 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:02,005 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:02,008 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:02,012 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:02,019 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:02,020 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:02,022 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:02,022 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:02,028 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:02,037 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:02,044 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:02,047 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:02,063 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:02,064 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:02,073 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:02,075 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:02,084 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:02,100 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:02,101 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:02,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:02,252 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:02,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:02,266 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 11:56:02,267 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:02,268 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:02,710 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:02,710 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2057392270] [2021-05-06 11:56:02,710 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2057392270] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:02,710 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:02,710 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2021-05-06 11:56:02,710 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1840964073] [2021-05-06 11:56:02,711 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-06 11:56:02,711 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:02,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-06 11:56:02,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=605, Invalid=1287, Unknown=0, NotChecked=0, Total=1892 [2021-05-06 11:56:02,711 INFO L87 Difference]: Start difference. First operand 123 states and 127 transitions. Second operand has 44 states, 44 states have (on average 1.6363636363636365) internal successors, (72), 43 states have internal predecessors, (72), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:04,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:04,600 INFO L93 Difference]: Finished difference Result 197 states and 211 transitions. [2021-05-06 11:56:04,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-06 11:56:04,601 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.6363636363636365) internal successors, (72), 43 states have internal predecessors, (72), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 76 [2021-05-06 11:56:04,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:04,601 INFO L225 Difference]: With dead ends: 197 [2021-05-06 11:56:04,601 INFO L226 Difference]: Without dead ends: 130 [2021-05-06 11:56:04,603 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1965 ImplicationChecksByTransitivity, 1820.6ms TimeCoverageRelationStatistics Valid=1809, Invalid=5331, Unknown=0, NotChecked=0, Total=7140 [2021-05-06 11:56:04,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-05-06 11:56:04,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 82. [2021-05-06 11:56:04,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 77 states have (on average 1.051948051948052) internal successors, (81), 77 states have internal predecessors, (81), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:04,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 85 transitions. [2021-05-06 11:56:04,609 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 85 transitions. Word has length 76 [2021-05-06 11:56:04,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:04,609 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 85 transitions. [2021-05-06 11:56:04,609 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 1.6363636363636365) internal successors, (72), 43 states have internal predecessors, (72), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:04,609 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 85 transitions. [2021-05-06 11:56:04,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-06 11:56:04,609 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:04,609 INFO L523 BasicCegarLoop]: trace histogram [27, 26, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:04,609 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-05-06 11:56:04,610 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:04,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:04,610 INFO L82 PathProgramCache]: Analyzing trace with hash -1509154617, now seen corresponding path program 15 times [2021-05-06 11:56:04,610 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:04,610 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [110869722] [2021-05-06 11:56:04,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:04,623 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:04,637 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:04,639 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:04,647 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:04,649 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:04,658 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:04,672 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:04,682 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:04,683 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:04,686 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:04,695 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:04,702 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:04,709 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:04,711 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:04,711 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:04,715 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:04,725 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:04,733 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:04,736 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:04,752 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:04,753 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:04,765 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:04,767 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:04,777 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:04,792 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:04,795 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:04,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:04,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:04,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:04,965 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:04,966 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:04,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:05,514 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:05,514 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [110869722] [2021-05-06 11:56:05,514 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [110869722] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:05,514 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:05,514 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2021-05-06 11:56:05,514 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107334751] [2021-05-06 11:56:05,514 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-06 11:56:05,514 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:05,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-06 11:56:05,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=686, Invalid=1476, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 11:56:05,515 INFO L87 Difference]: Start difference. First operand 82 states and 85 transitions. Second operand has 47 states, 47 states have (on average 1.6382978723404256) internal successors, (77), 46 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 11:56:07,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:07,734 INFO L93 Difference]: Finished difference Result 161 states and 172 transitions. [2021-05-06 11:56:07,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-06 11:56:07,734 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.6382978723404256) internal successors, (77), 46 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 11:56:07,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:07,735 INFO L225 Difference]: With dead ends: 161 [2021-05-06 11:56:07,735 INFO L226 Difference]: Without dead ends: 87 [2021-05-06 11:56:07,736 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2263 ImplicationChecksByTransitivity, 2127.5ms TimeCoverageRelationStatistics Valid=2052, Invalid=6138, Unknown=0, NotChecked=0, Total=8190 [2021-05-06 11:56:07,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-06 11:56:07,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2021-05-06 11:56:07,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.048780487804878) internal successors, (86), 82 states have internal predecessors, (86), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:07,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2021-05-06 11:56:07,741 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 81 [2021-05-06 11:56:07,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:07,741 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2021-05-06 11:56:07,741 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 1.6382978723404256) internal successors, (77), 46 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 11:56:07,741 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2021-05-06 11:56:07,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-06 11:56:07,742 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:07,742 INFO L523 BasicCegarLoop]: trace histogram [29, 28, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:07,742 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2021-05-06 11:56:07,742 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:07,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:07,743 INFO L82 PathProgramCache]: Analyzing trace with hash -15736122, now seen corresponding path program 16 times [2021-05-06 11:56:07,743 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:07,743 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [595071505] [2021-05-06 11:56:07,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:07,749 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:07,750 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:07,751 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:07,759 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:07,762 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:07,780 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:07,794 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:07,796 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:07,796 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:07,801 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:07,812 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:07,819 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:07,820 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:07,822 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:07,828 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:07,831 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:07,835 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:07,842 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:07,848 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:07,849 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:07,850 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:07,857 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:07,859 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:07,878 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:07,892 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:07,905 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:07,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:08,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:08,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:08,157 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 11:56:08,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:08,759 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:08,759 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [595071505] [2021-05-06 11:56:08,759 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [595071505] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:08,759 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:08,759 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2021-05-06 11:56:08,759 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106447514] [2021-05-06 11:56:08,760 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-06 11:56:08,760 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:08,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-06 11:56:08,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=849, Invalid=1907, Unknown=0, NotChecked=0, Total=2756 [2021-05-06 11:56:08,761 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand has 50 states, 50 states have (on average 1.64) internal successors, (82), 49 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:11,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:11,209 INFO L93 Difference]: Finished difference Result 225 states and 236 transitions. [2021-05-06 11:56:11,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-06 11:56:11,209 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.64) internal successors, (82), 49 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 86 [2021-05-06 11:56:11,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:11,210 INFO L225 Difference]: With dead ends: 225 [2021-05-06 11:56:11,210 INFO L226 Difference]: Without dead ends: 146 [2021-05-06 11:56:11,211 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2889 ImplicationChecksByTransitivity, 2389.7ms TimeCoverageRelationStatistics Valid=2392, Invalid=7508, Unknown=0, NotChecked=0, Total=9900 [2021-05-06 11:56:11,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-05-06 11:56:11,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 146. [2021-05-06 11:56:11,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 141 states have (on average 1.0354609929078014) internal successors, (146), 141 states have internal predecessors, (146), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:11,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 150 transitions. [2021-05-06 11:56:11,218 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 150 transitions. Word has length 86 [2021-05-06 11:56:11,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:11,219 INFO L480 AbstractCegarLoop]: Abstraction has 146 states and 150 transitions. [2021-05-06 11:56:11,219 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 1.64) internal successors, (82), 49 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:11,219 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 150 transitions. [2021-05-06 11:56:11,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-06 11:56:11,219 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:11,219 INFO L523 BasicCegarLoop]: trace histogram [30, 29, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:11,219 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2021-05-06 11:56:11,219 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:11,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:11,220 INFO L82 PathProgramCache]: Analyzing trace with hash -945173960, now seen corresponding path program 17 times [2021-05-06 11:56:11,220 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:11,220 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [346635210] [2021-05-06 11:56:11,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:11,228 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:11,242 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:11,246 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:11,255 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:11,257 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:11,267 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:11,282 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:11,284 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:11,288 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:11,292 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:11,308 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:11,316 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:11,317 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:11,318 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:11,325 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:11,328 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:11,333 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:11,341 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:11,345 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:11,346 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:11,347 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:11,354 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:11,356 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:11,375 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:11,389 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:11,389 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:11,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:11,637 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:11,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:11,641 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 11:56:11,643 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:12,280 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:12,280 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [346635210] [2021-05-06 11:56:12,280 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [346635210] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:12,280 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:12,280 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2021-05-06 11:56:12,280 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322397639] [2021-05-06 11:56:12,281 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-06 11:56:12,281 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:12,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-06 11:56:12,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=922, Invalid=2048, Unknown=0, NotChecked=0, Total=2970 [2021-05-06 11:56:12,281 INFO L87 Difference]: Start difference. First operand 146 states and 150 transitions. Second operand has 52 states, 52 states have (on average 1.6346153846153846) internal successors, (85), 51 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 11:56:14,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:14,907 INFO L93 Difference]: Finished difference Result 229 states and 239 transitions. [2021-05-06 11:56:14,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-06 11:56:14,907 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.6346153846153846) internal successors, (85), 51 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 11:56:14,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:14,908 INFO L225 Difference]: With dead ends: 229 [2021-05-06 11:56:14,908 INFO L226 Difference]: Without dead ends: 149 [2021-05-06 11:56:14,909 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3140 ImplicationChecksByTransitivity, 2535.5ms TimeCoverageRelationStatistics Valid=2605, Invalid=8107, Unknown=0, NotChecked=0, Total=10712 [2021-05-06 11:56:14,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-06 11:56:14,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2021-05-06 11:56:14,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 144 states have (on average 1.0347222222222223) internal successors, (149), 144 states have internal predecessors, (149), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:14,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 153 transitions. [2021-05-06 11:56:14,917 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 153 transitions. Word has length 89 [2021-05-06 11:56:14,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:14,917 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 153 transitions. [2021-05-06 11:56:14,918 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 1.6346153846153846) internal successors, (85), 51 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 11:56:14,918 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 153 transitions. [2021-05-06 11:56:14,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-05-06 11:56:14,918 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:14,918 INFO L523 BasicCegarLoop]: trace histogram [31, 30, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:14,918 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2021-05-06 11:56:14,918 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:14,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:14,919 INFO L82 PathProgramCache]: Analyzing trace with hash 1549286768, now seen corresponding path program 18 times [2021-05-06 11:56:14,919 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:14,919 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [811582542] [2021-05-06 11:56:14,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:14,927 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:14,940 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:14,942 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:14,949 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:14,951 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:14,959 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:14,974 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:14,976 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:14,982 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:14,985 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:14,989 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:14,996 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:14,996 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:14,998 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:15,004 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:15,011 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:15,016 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:15,023 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:15,026 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:15,040 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:15,041 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:15,049 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:15,052 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:15,062 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:15,077 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:15,077 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:15,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:15,259 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:15,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:15,263 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:15,263 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:15,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:15,888 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:15,889 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [811582542] [2021-05-06 11:56:15,889 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [811582542] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:15,889 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:15,889 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2021-05-06 11:56:15,889 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777508872] [2021-05-06 11:56:15,889 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-06 11:56:15,889 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:15,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-06 11:56:15,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=915, Invalid=1947, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 11:56:15,890 INFO L87 Difference]: Start difference. First operand 149 states and 153 transitions. Second operand has 54 states, 54 states have (on average 1.6296296296296295) internal successors, (88), 53 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:18,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:18,683 INFO L93 Difference]: Finished difference Result 239 states and 255 transitions. [2021-05-06 11:56:18,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-06 11:56:18,683 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.6296296296296295) internal successors, (88), 53 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 92 [2021-05-06 11:56:18,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:18,684 INFO L225 Difference]: With dead ends: 239 [2021-05-06 11:56:18,684 INFO L226 Difference]: Without dead ends: 158 [2021-05-06 11:56:18,685 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3070 ImplicationChecksByTransitivity, 2656.4ms TimeCoverageRelationStatistics Valid=2739, Invalid=8181, Unknown=0, NotChecked=0, Total=10920 [2021-05-06 11:56:18,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-05-06 11:56:18,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 98. [2021-05-06 11:56:18,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 93 states have (on average 1.043010752688172) internal successors, (97), 93 states have internal predecessors, (97), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:18,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 101 transitions. [2021-05-06 11:56:18,691 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 101 transitions. Word has length 92 [2021-05-06 11:56:18,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:18,692 INFO L480 AbstractCegarLoop]: Abstraction has 98 states and 101 transitions. [2021-05-06 11:56:18,692 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 1.6296296296296295) internal successors, (88), 53 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:18,692 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 101 transitions. [2021-05-06 11:56:18,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-06 11:56:18,692 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:18,692 INFO L523 BasicCegarLoop]: trace histogram [33, 32, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:18,692 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2021-05-06 11:56:18,692 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:18,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:18,693 INFO L82 PathProgramCache]: Analyzing trace with hash -168854935, now seen corresponding path program 19 times [2021-05-06 11:56:18,693 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:18,693 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [520061416] [2021-05-06 11:56:18,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:18,699 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:18,711 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:18,714 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:18,723 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:18,724 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:18,733 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:18,755 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:18,758 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:18,758 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:18,762 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:18,771 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:18,779 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:18,780 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:18,782 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:18,782 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:18,787 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:18,796 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:18,803 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:18,806 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:18,819 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:18,821 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:18,828 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:18,830 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:18,838 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:18,851 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 11:56:18,852 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:18,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:19,063 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:19,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:19,073 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:19,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:19,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:19,782 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:19,782 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [520061416] [2021-05-06 11:56:19,782 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [520061416] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:19,782 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:19,782 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2021-05-06 11:56:19,782 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881155411] [2021-05-06 11:56:19,782 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-06 11:56:19,782 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:19,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-06 11:56:19,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1014, Invalid=2178, Unknown=0, NotChecked=0, Total=3192 [2021-05-06 11:56:19,783 INFO L87 Difference]: Start difference. First operand 98 states and 101 transitions. Second operand has 57 states, 57 states have (on average 1.631578947368421) internal successors, (93), 56 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 11:56:22,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:22,819 INFO L93 Difference]: Finished difference Result 193 states and 204 transitions. [2021-05-06 11:56:22,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-06 11:56:22,821 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.631578947368421) internal successors, (93), 56 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 11:56:22,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:22,821 INFO L225 Difference]: With dead ends: 193 [2021-05-06 11:56:22,821 INFO L226 Difference]: Without dead ends: 103 [2021-05-06 11:56:22,822 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3440 ImplicationChecksByTransitivity, 2875.3ms TimeCoverageRelationStatistics Valid=3036, Invalid=9174, Unknown=0, NotChecked=0, Total=12210 [2021-05-06 11:56:22,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-05-06 11:56:22,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-05-06 11:56:22,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.0408163265306123) internal successors, (102), 98 states have internal predecessors, (102), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:22,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2021-05-06 11:56:22,828 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 97 [2021-05-06 11:56:22,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:22,828 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2021-05-06 11:56:22,828 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 1.631578947368421) internal successors, (93), 56 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 11:56:22,828 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2021-05-06 11:56:22,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:56:22,828 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:22,828 INFO L523 BasicCegarLoop]: trace histogram [35, 34, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:22,828 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2021-05-06 11:56:22,829 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:22,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:22,829 INFO L82 PathProgramCache]: Analyzing trace with hash -1165760156, now seen corresponding path program 20 times [2021-05-06 11:56:22,829 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:22,829 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [542749958] [2021-05-06 11:56:22,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:22,836 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:22,836 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:22,837 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:22,844 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:22,845 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:22,864 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:22,879 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:22,882 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:22,889 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:22,893 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:22,897 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:22,904 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:22,905 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:22,908 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:22,914 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:22,918 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:22,922 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:22,929 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:22,932 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:22,952 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:22,955 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:22,964 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:22,967 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:22,975 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:22,989 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:22,993 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:23,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:23,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:23,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:23,317 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:23,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:24,116 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:24,117 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [542749958] [2021-05-06 11:56:24,117 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [542749958] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:24,117 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:24,117 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [60] imperfect sequences [] total 60 [2021-05-06 11:56:24,117 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744237397] [2021-05-06 11:56:24,117 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-06 11:56:24,117 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:24,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-06 11:56:24,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1209, Invalid=2697, Unknown=0, NotChecked=0, Total=3906 [2021-05-06 11:56:24,118 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand has 60 states, 60 states have (on average 1.6333333333333333) internal successors, (98), 59 states have internal predecessors, (98), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:27,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:27,525 INFO L93 Difference]: Finished difference Result 269 states and 280 transitions. [2021-05-06 11:56:27,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-05-06 11:56:27,526 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 1.6333333333333333) internal successors, (98), 59 states have internal predecessors, (98), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 102 [2021-05-06 11:56:27,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:27,526 INFO L225 Difference]: With dead ends: 269 [2021-05-06 11:56:27,526 INFO L226 Difference]: Without dead ends: 174 [2021-05-06 11:56:27,527 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4202 ImplicationChecksByTransitivity, 3270.1ms TimeCoverageRelationStatistics Valid=3444, Invalid=10836, Unknown=0, NotChecked=0, Total=14280 [2021-05-06 11:56:27,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2021-05-06 11:56:27,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 174. [2021-05-06 11:56:27,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 169 states have (on average 1.029585798816568) internal successors, (174), 169 states have internal predecessors, (174), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:27,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 178 transitions. [2021-05-06 11:56:27,541 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 178 transitions. Word has length 102 [2021-05-06 11:56:27,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:27,541 INFO L480 AbstractCegarLoop]: Abstraction has 174 states and 178 transitions. [2021-05-06 11:56:27,541 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 60 states have (on average 1.6333333333333333) internal successors, (98), 59 states have internal predecessors, (98), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:27,541 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 178 transitions. [2021-05-06 11:56:27,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-06 11:56:27,541 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:27,541 INFO L523 BasicCegarLoop]: trace histogram [36, 35, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:27,542 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2021-05-06 11:56:27,542 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:27,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:27,542 INFO L82 PathProgramCache]: Analyzing trace with hash -68714150, now seen corresponding path program 21 times [2021-05-06 11:56:27,542 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:27,542 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1718667189] [2021-05-06 11:56:27,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:27,548 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:27,549 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:27,550 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:27,557 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:27,559 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:27,578 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:27,592 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:27,594 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:27,595 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:27,598 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:27,607 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:27,614 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:27,615 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:27,617 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:27,617 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:27,621 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:27,630 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:27,637 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:27,640 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:27,641 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:27,642 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:27,650 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:27,652 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:27,676 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:27,689 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 11:56:27,690 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:27,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:27,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:27,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:27,943 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:27,944 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:27,945 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:28,760 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:28,761 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1718667189] [2021-05-06 11:56:28,761 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1718667189] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:28,761 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:28,761 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [62] imperfect sequences [] total 62 [2021-05-06 11:56:28,761 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [74574916] [2021-05-06 11:56:28,761 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-06 11:56:28,761 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:28,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-06 11:56:28,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1202, Invalid=2580, Unknown=0, NotChecked=0, Total=3782 [2021-05-06 11:56:28,762 INFO L87 Difference]: Start difference. First operand 174 states and 178 transitions. Second operand has 62 states, 62 states have (on average 1.6290322580645162) internal successors, (101), 61 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 11:56:32,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:32,224 INFO L93 Difference]: Finished difference Result 277 states and 291 transitions. [2021-05-06 11:56:32,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-06 11:56:32,224 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.6290322580645162) internal successors, (101), 61 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 11:56:32,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:32,225 INFO L225 Difference]: With dead ends: 277 [2021-05-06 11:56:32,225 INFO L226 Difference]: Without dead ends: 181 [2021-05-06 11:56:32,226 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4120 ImplicationChecksByTransitivity, 3265.1ms TimeCoverageRelationStatistics Valid=3600, Invalid=10920, Unknown=0, NotChecked=0, Total=14520 [2021-05-06 11:56:32,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2021-05-06 11:56:32,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 111. [2021-05-06 11:56:32,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 106 states have (on average 1.0377358490566038) internal successors, (110), 106 states have internal predecessors, (110), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:32,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 114 transitions. [2021-05-06 11:56:32,232 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 114 transitions. Word has length 105 [2021-05-06 11:56:32,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:32,232 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 114 transitions. [2021-05-06 11:56:32,232 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 62 states, 62 states have (on average 1.6290322580645162) internal successors, (101), 61 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 11:56:32,233 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 114 transitions. [2021-05-06 11:56:32,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-06 11:56:32,233 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:32,233 INFO L523 BasicCegarLoop]: trace histogram [38, 37, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:32,233 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2021-05-06 11:56:32,233 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:32,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:32,234 INFO L82 PathProgramCache]: Analyzing trace with hash -2116954477, now seen corresponding path program 22 times [2021-05-06 11:56:32,234 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:32,234 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1464212028] [2021-05-06 11:56:32,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:32,242 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:32,255 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:32,257 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:32,264 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:32,265 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:32,273 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:32,287 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:32,289 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:32,294 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:32,297 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:32,301 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:32,308 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:32,308 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:32,310 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:32,310 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:32,314 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:32,322 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:32,329 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:32,332 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:32,345 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:32,346 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:32,354 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:32,356 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:32,363 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:32,377 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:32,377 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:32,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:32,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:32,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:32,635 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:32,636 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:32,637 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:33,510 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:33,510 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1464212028] [2021-05-06 11:56:33,510 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1464212028] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:33,511 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:33,511 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [65] imperfect sequences [] total 65 [2021-05-06 11:56:33,511 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048954136] [2021-05-06 11:56:33,511 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-06 11:56:33,511 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:33,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-06 11:56:33,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1315, Invalid=2845, Unknown=0, NotChecked=0, Total=4160 [2021-05-06 11:56:33,512 INFO L87 Difference]: Start difference. First operand 111 states and 114 transitions. Second operand has 65 states, 65 states have (on average 1.6307692307692307) internal successors, (106), 64 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:37,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:37,213 INFO L93 Difference]: Finished difference Result 219 states and 230 transitions. [2021-05-06 11:56:37,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-05-06 11:56:37,213 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.6307692307692307) internal successors, (106), 64 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 110 [2021-05-06 11:56:37,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:37,214 INFO L225 Difference]: With dead ends: 219 [2021-05-06 11:56:37,214 INFO L226 Difference]: Without dead ends: 116 [2021-05-06 11:56:37,215 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4547 ImplicationChecksByTransitivity, 3527.1ms TimeCoverageRelationStatistics Valid=3939, Invalid=12063, Unknown=0, NotChecked=0, Total=16002 [2021-05-06 11:56:37,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-05-06 11:56:37,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2021-05-06 11:56:37,221 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 11:56:37,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 119 transitions. [2021-05-06 11:56:37,222 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 119 transitions. Word has length 110 [2021-05-06 11:56:37,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:37,222 INFO L480 AbstractCegarLoop]: Abstraction has 116 states and 119 transitions. [2021-05-06 11:56:37,222 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 65 states have (on average 1.6307692307692307) internal successors, (106), 64 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:37,222 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 119 transitions. [2021-05-06 11:56:37,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-05-06 11:56:37,222 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:37,223 INFO L523 BasicCegarLoop]: trace histogram [40, 39, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:37,223 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68 [2021-05-06 11:56:37,223 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:37,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:37,223 INFO L82 PathProgramCache]: Analyzing trace with hash 1837929510, now seen corresponding path program 23 times [2021-05-06 11:56:37,223 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:37,223 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [762829962] [2021-05-06 11:56:37,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:37,235 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:37,236 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:37,237 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:37,243 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:37,245 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:37,266 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:37,279 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:37,284 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:37,290 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:37,293 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:37,297 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:37,303 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 11:56:37,304 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:37,306 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:37,312 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:37,315 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:37,319 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:37,326 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:37,329 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:37,329 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:37,330 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:37,338 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:37,340 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:37,357 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:37,371 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:37,372 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:37,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:37,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:37,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:37,659 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:37,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:37,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:38,607 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:38,607 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [762829962] [2021-05-06 11:56:38,607 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [762829962] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:38,607 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:38,607 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [68] imperfect sequences [] total 68 [2021-05-06 11:56:38,607 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195673127] [2021-05-06 11:56:38,607 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2021-05-06 11:56:38,607 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:38,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-05-06 11:56:38,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1433, Invalid=3123, Unknown=0, NotChecked=0, Total=4556 [2021-05-06 11:56:38,609 INFO L87 Difference]: Start difference. First operand 116 states and 119 transitions. Second operand has 68 states, 68 states have (on average 1.6323529411764706) internal successors, (111), 67 states have internal predecessors, (111), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:42,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:42,609 INFO L93 Difference]: Finished difference Result 229 states and 240 transitions. [2021-05-06 11:56:42,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-05-06 11:56:42,609 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 1.6323529411764706) internal successors, (111), 67 states have internal predecessors, (111), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 115 [2021-05-06 11:56:42,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:42,610 INFO L225 Difference]: With dead ends: 229 [2021-05-06 11:56:42,610 INFO L226 Difference]: Without dead ends: 121 [2021-05-06 11:56:42,611 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4995 ImplicationChecksByTransitivity, 3773.8ms TimeCoverageRelationStatistics Valid=4293, Invalid=13263, Unknown=0, NotChecked=0, Total=17556 [2021-05-06 11:56:42,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-05-06 11:56:42,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2021-05-06 11:56:42,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 116 states have (on average 1.0344827586206897) internal successors, (120), 116 states have internal predecessors, (120), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:42,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 124 transitions. [2021-05-06 11:56:42,617 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 124 transitions. Word has length 115 [2021-05-06 11:56:42,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:42,617 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 124 transitions. [2021-05-06 11:56:42,617 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 68 states, 68 states have (on average 1.6323529411764706) internal successors, (111), 67 states have internal predecessors, (111), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:42,617 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 124 transitions. [2021-05-06 11:56:42,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-05-06 11:56:42,618 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:42,618 INFO L523 BasicCegarLoop]: trace histogram [42, 41, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:42,618 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71 [2021-05-06 11:56:42,618 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:42,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:42,618 INFO L82 PathProgramCache]: Analyzing trace with hash -1457813305, now seen corresponding path program 24 times [2021-05-06 11:56:42,618 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:42,618 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1159340848] [2021-05-06 11:56:42,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:42,624 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:42,637 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:42,638 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:42,645 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:42,647 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:42,654 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:42,667 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:42,669 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:42,669 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:42,673 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:42,681 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:42,687 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:42,688 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:42,690 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:42,695 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:42,698 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:42,702 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:42,709 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:42,712 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:42,712 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:42,713 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:42,721 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:42,723 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:42,741 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:42,754 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:42,758 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:42,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:43,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:43,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:43,071 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:43,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:43,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:44,124 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:44,124 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1159340848] [2021-05-06 11:56:44,124 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1159340848] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:44,124 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:44,124 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [71] imperfect sequences [] total 71 [2021-05-06 11:56:44,124 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530708313] [2021-05-06 11:56:44,125 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2021-05-06 11:56:44,125 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:44,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-05-06 11:56:44,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1556, Invalid=3414, Unknown=0, NotChecked=0, Total=4970 [2021-05-06 11:56:44,125 INFO L87 Difference]: Start difference. First operand 121 states and 124 transitions. Second operand has 71 states, 71 states have (on average 1.6338028169014085) internal successors, (116), 70 states have internal predecessors, (116), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:48,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:48,479 INFO L93 Difference]: Finished difference Result 239 states and 250 transitions. [2021-05-06 11:56:48,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-06 11:56:48,480 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 1.6338028169014085) internal successors, (116), 70 states have internal predecessors, (116), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 120 [2021-05-06 11:56:48,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:48,480 INFO L225 Difference]: With dead ends: 239 [2021-05-06 11:56:48,480 INFO L226 Difference]: Without dead ends: 126 [2021-05-06 11:56:48,481 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5464 ImplicationChecksByTransitivity, 4155.0ms TimeCoverageRelationStatistics Valid=4662, Invalid=14520, Unknown=0, NotChecked=0, Total=19182 [2021-05-06 11:56:48,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-05-06 11:56:48,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2021-05-06 11:56:48,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 121 states have (on average 1.0330578512396693) internal successors, (125), 121 states have internal predecessors, (125), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:48,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 129 transitions. [2021-05-06 11:56:48,488 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 129 transitions. Word has length 120 [2021-05-06 11:56:48,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:48,488 INFO L480 AbstractCegarLoop]: Abstraction has 126 states and 129 transitions. [2021-05-06 11:56:48,489 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 71 states, 71 states have (on average 1.6338028169014085) internal successors, (116), 70 states have internal predecessors, (116), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:48,489 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 129 transitions. [2021-05-06 11:56:48,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-06 11:56:48,489 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:48,489 INFO L523 BasicCegarLoop]: trace histogram [44, 43, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:48,489 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74 [2021-05-06 11:56:48,489 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:48,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:48,490 INFO L82 PathProgramCache]: Analyzing trace with hash 195292402, now seen corresponding path program 25 times [2021-05-06 11:56:48,490 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:48,490 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1460004647] [2021-05-06 11:56:48,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:48,499 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:48,512 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:48,513 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:48,521 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:48,523 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:48,531 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:48,545 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:48,547 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:48,548 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:48,551 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:48,560 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:48,567 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 11:56:48,567 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:48,569 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:48,569 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:48,573 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:48,581 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:48,588 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 11:56:48,599 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:48,613 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:48,615 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:48,624 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:48,626 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:48,633 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:48,647 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:48,648 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:48,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:48,966 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:48,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:48,977 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:48,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:48,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:50,135 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:50,136 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1460004647] [2021-05-06 11:56:50,136 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1460004647] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:50,136 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:50,136 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [74] imperfect sequences [] total 74 [2021-05-06 11:56:50,136 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [617366539] [2021-05-06 11:56:50,136 INFO L460 AbstractCegarLoop]: Interpolant automaton has 74 states [2021-05-06 11:56:50,136 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:50,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-05-06 11:56:50,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1684, Invalid=3718, Unknown=0, NotChecked=0, Total=5402 [2021-05-06 11:56:50,137 INFO L87 Difference]: Start difference. First operand 126 states and 129 transitions. Second operand has 74 states, 74 states have (on average 1.635135135135135) internal successors, (121), 73 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 11:56:54,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:54,851 INFO L93 Difference]: Finished difference Result 249 states and 260 transitions. [2021-05-06 11:56:54,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-05-06 11:56:54,852 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 1.635135135135135) internal successors, (121), 73 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 11:56:54,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:54,853 INFO L225 Difference]: With dead ends: 249 [2021-05-06 11:56:54,853 INFO L226 Difference]: Without dead ends: 131 [2021-05-06 11:56:54,854 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5954 ImplicationChecksByTransitivity, 4466.7ms TimeCoverageRelationStatistics Valid=5046, Invalid=15834, Unknown=0, NotChecked=0, Total=20880 [2021-05-06 11:56:54,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-05-06 11:56:54,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 131. [2021-05-06 11:56:54,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 126 states have (on average 1.0317460317460319) internal successors, (130), 126 states have internal predecessors, (130), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:54,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 134 transitions. [2021-05-06 11:56:54,860 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 134 transitions. Word has length 125 [2021-05-06 11:56:54,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:54,861 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 134 transitions. [2021-05-06 11:56:54,861 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 74 states, 74 states have (on average 1.635135135135135) internal successors, (121), 73 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 11:56:54,861 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 134 transitions. [2021-05-06 11:56:54,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-05-06 11:56:54,861 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:54,861 INFO L523 BasicCegarLoop]: trace histogram [46, 45, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:54,862 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77 [2021-05-06 11:56:54,862 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:54,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:54,862 INFO L82 PathProgramCache]: Analyzing trace with hash 1280005371, now seen corresponding path program 26 times [2021-05-06 11:56:54,862 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:54,862 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1686671358] [2021-05-06 11:56:54,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:54,868 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:54,869 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:54,870 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:54,878 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:54,880 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:54,900 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:54,913 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:54,916 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:54,917 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:54,921 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:54,929 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:54,936 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:54,937 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:54,939 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:54,939 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:54,943 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:54,952 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:54,959 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:54,964 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:54,964 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:54,965 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:54,975 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:54,978 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:54,997 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:55,011 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:55,012 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:55,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:55,437 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:55,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:55,441 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:55,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:56,638 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:56,638 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1686671358] [2021-05-06 11:56:56,638 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1686671358] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:56,638 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:56,638 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [77] imperfect sequences [] total 77 [2021-05-06 11:56:56,638 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127819321] [2021-05-06 11:56:56,639 INFO L460 AbstractCegarLoop]: Interpolant automaton has 77 states [2021-05-06 11:56:56,639 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:56,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-05-06 11:56:56,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1931, Invalid=4389, Unknown=0, NotChecked=0, Total=6320 [2021-05-06 11:56:56,639 INFO L87 Difference]: Start difference. First operand 131 states and 134 transitions. Second operand has 77 states, 77 states have (on average 1.6363636363636365) internal successors, (126), 76 states have internal predecessors, (126), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:01,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:01,759 INFO L93 Difference]: Finished difference Result 347 states and 358 transitions. [2021-05-06 11:57:01,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-05-06 11:57:01,759 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 1.6363636363636365) internal successors, (126), 76 states have internal predecessors, (126), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 130 [2021-05-06 11:57:01,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:01,760 INFO L225 Difference]: With dead ends: 347 [2021-05-06 11:57:01,760 INFO L226 Difference]: Without dead ends: 224 [2021-05-06 11:57:01,761 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6948 ImplicationChecksByTransitivity, 4829.5ms TimeCoverageRelationStatistics Valid=5564, Invalid=17998, Unknown=0, NotChecked=0, Total=23562 [2021-05-06 11:57:01,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2021-05-06 11:57:01,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 224. [2021-05-06 11:57:01,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 219 states have (on average 1.0228310502283104) internal successors, (224), 219 states have internal predecessors, (224), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:01,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 228 transitions. [2021-05-06 11:57:01,777 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 228 transitions. Word has length 130 [2021-05-06 11:57:01,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:01,777 INFO L480 AbstractCegarLoop]: Abstraction has 224 states and 228 transitions. [2021-05-06 11:57:01,778 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 77 states, 77 states have (on average 1.6363636363636365) internal successors, (126), 76 states have internal predecessors, (126), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:01,778 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 228 transitions. [2021-05-06 11:57:01,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-05-06 11:57:01,778 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:01,778 INFO L523 BasicCegarLoop]: trace histogram [47, 46, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:01,778 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80 [2021-05-06 11:57:01,778 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:01,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:01,779 INFO L82 PathProgramCache]: Analyzing trace with hash 1124794915, now seen corresponding path program 27 times [2021-05-06 11:57:01,779 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:01,779 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1771204022] [2021-05-06 11:57:01,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:01,786 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:01,803 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:01,804 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:01,811 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:01,813 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:01,820 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:01,833 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:01,836 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:01,836 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:01,840 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:01,848 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:01,855 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:01,856 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:01,857 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:01,862 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:01,866 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:01,869 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:01,876 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:01,879 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:01,880 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:01,881 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:01,889 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:01,891 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:01,911 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:01,924 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:01,925 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:01,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:02,268 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:02,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:02,279 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:02,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:02,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:03,543 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:03,543 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1771204022] [2021-05-06 11:57:03,544 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1771204022] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:03,544 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:03,544 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [79] imperfect sequences [] total 79 [2021-05-06 11:57:03,544 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041912471] [2021-05-06 11:57:03,544 INFO L460 AbstractCegarLoop]: Interpolant automaton has 79 states [2021-05-06 11:57:03,544 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:03,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-05-06 11:57:03,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1924, Invalid=4238, Unknown=0, NotChecked=0, Total=6162 [2021-05-06 11:57:03,545 INFO L87 Difference]: Start difference. First operand 224 states and 228 transitions. Second operand has 79 states, 79 states have (on average 1.6329113924050633) internal successors, (129), 78 states have internal predecessors, (129), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:08,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:08,896 INFO L93 Difference]: Finished difference Result 355 states and 369 transitions. [2021-05-06 11:57:08,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-05-06 11:57:08,896 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 1.6329113924050633) internal successors, (129), 78 states have internal predecessors, (129), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 133 [2021-05-06 11:57:08,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:08,897 INFO L225 Difference]: With dead ends: 355 [2021-05-06 11:57:08,897 INFO L226 Difference]: Without dead ends: 231 [2021-05-06 11:57:08,899 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6839 ImplicationChecksByTransitivity, 5027.3ms TimeCoverageRelationStatistics Valid=5766, Invalid=18104, Unknown=0, NotChecked=0, Total=23870 [2021-05-06 11:57:08,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2021-05-06 11:57:08,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 139. [2021-05-06 11:57:08,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.0298507462686568) internal successors, (138), 134 states have internal predecessors, (138), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:08,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 142 transitions. [2021-05-06 11:57:08,909 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 142 transitions. Word has length 133 [2021-05-06 11:57:08,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:08,910 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 142 transitions. [2021-05-06 11:57:08,910 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 79 states, 79 states have (on average 1.6329113924050633) internal successors, (129), 78 states have internal predecessors, (129), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:08,910 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 142 transitions. [2021-05-06 11:57:08,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-05-06 11:57:08,911 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:08,911 INFO L523 BasicCegarLoop]: trace histogram [49, 48, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:08,911 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83 [2021-05-06 11:57:08,911 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:08,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:08,911 INFO L82 PathProgramCache]: Analyzing trace with hash -2077295638, now seen corresponding path program 28 times [2021-05-06 11:57:08,911 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:08,911 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [907859947] [2021-05-06 11:57:08,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:08,920 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:08,938 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:08,939 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:08,949 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:08,951 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:08,961 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:08,979 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:08,981 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:08,982 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:08,986 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:08,995 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:09,002 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:09,003 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:09,005 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:09,005 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:09,009 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:09,019 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:09,026 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:09,029 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:09,042 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:09,045 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:09,053 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:09,055 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:09,064 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:09,077 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:09,078 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:09,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:09,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:09,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:09,454 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:09,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:09,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:10,814 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:10,814 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [907859947] [2021-05-06 11:57:10,814 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [907859947] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:10,814 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:10,814 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [82] imperfect sequences [] total 82 [2021-05-06 11:57:10,814 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [746869354] [2021-05-06 11:57:10,815 INFO L460 AbstractCegarLoop]: Interpolant automaton has 82 states [2021-05-06 11:57:10,815 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:10,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-05-06 11:57:10,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2066, Invalid=4576, Unknown=0, NotChecked=0, Total=6642 [2021-05-06 11:57:10,815 INFO L87 Difference]: Start difference. First operand 139 states and 142 transitions. Second operand has 82 states, 82 states have (on average 1.6341463414634145) internal successors, (134), 81 states have internal predecessors, (134), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:16,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:16,417 INFO L93 Difference]: Finished difference Result 275 states and 286 transitions. [2021-05-06 11:57:16,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-05-06 11:57:16,417 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 1.6341463414634145) internal successors, (134), 81 states have internal predecessors, (134), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 138 [2021-05-06 11:57:16,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:16,418 INFO L225 Difference]: With dead ends: 275 [2021-05-06 11:57:16,418 INFO L226 Difference]: Without dead ends: 144 [2021-05-06 11:57:16,419 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7358 ImplicationChecksByTransitivity, 5262.7ms TimeCoverageRelationStatistics Valid=6192, Invalid=19568, Unknown=0, NotChecked=0, Total=25760 [2021-05-06 11:57:16,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-05-06 11:57:16,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 144. [2021-05-06 11:57:16,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 139 states have (on average 1.0287769784172662) internal successors, (143), 139 states have internal predecessors, (143), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:16,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 147 transitions. [2021-05-06 11:57:16,429 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 147 transitions. Word has length 138 [2021-05-06 11:57:16,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:16,430 INFO L480 AbstractCegarLoop]: Abstraction has 144 states and 147 transitions. [2021-05-06 11:57:16,430 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 82 states, 82 states have (on average 1.6341463414634145) internal successors, (134), 81 states have internal predecessors, (134), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:16,430 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 147 transitions. [2021-05-06 11:57:16,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-05-06 11:57:16,430 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:16,431 INFO L523 BasicCegarLoop]: trace histogram [51, 50, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:16,431 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86 [2021-05-06 11:57:16,431 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:16,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:16,431 INFO L82 PathProgramCache]: Analyzing trace with hash -1760318289, now seen corresponding path program 29 times [2021-05-06 11:57:16,431 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:16,431 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [379165887] [2021-05-06 11:57:16,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:16,441 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:16,455 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:16,457 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:16,476 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:16,478 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:16,486 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:16,501 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:16,503 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:16,504 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:16,508 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:16,517 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:16,526 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 11:57:16,527 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:16,533 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:16,534 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:16,538 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:16,549 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:16,556 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:16,559 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:16,560 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:16,577 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:16,585 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:16,587 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:16,605 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:16,619 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:16,620 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:16,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:17,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:17,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:17,105 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:17,106 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:18,554 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:18,554 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [379165887] [2021-05-06 11:57:18,554 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [379165887] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:18,554 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:18,554 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [85] imperfect sequences [] total 85 [2021-05-06 11:57:18,554 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [151095479] [2021-05-06 11:57:18,555 INFO L460 AbstractCegarLoop]: Interpolant automaton has 85 states [2021-05-06 11:57:18,555 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:18,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-05-06 11:57:18,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2338, Invalid=5318, Unknown=0, NotChecked=0, Total=7656 [2021-05-06 11:57:18,555 INFO L87 Difference]: Start difference. First operand 144 states and 147 transitions. Second operand has 85 states, 85 states have (on average 1.6352941176470588) internal successors, (139), 84 states have internal predecessors, (139), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:24,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:24,684 INFO L93 Difference]: Finished difference Result 383 states and 394 transitions. [2021-05-06 11:57:24,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-05-06 11:57:24,684 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 85 states have (on average 1.6352941176470588) internal successors, (139), 84 states have internal predecessors, (139), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 143 [2021-05-06 11:57:24,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:24,685 INFO L225 Difference]: With dead ends: 383 [2021-05-06 11:57:24,685 INFO L226 Difference]: Without dead ends: 247 [2021-05-06 11:57:24,686 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8489 ImplicationChecksByTransitivity, 5729.0ms TimeCoverageRelationStatistics Valid=6763, Invalid=21967, Unknown=0, NotChecked=0, Total=28730 [2021-05-06 11:57:24,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2021-05-06 11:57:24,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 247. [2021-05-06 11:57:24,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 247 states, 242 states have (on average 1.0206611570247934) internal successors, (247), 242 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 11:57:24,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 251 transitions. [2021-05-06 11:57:24,700 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 251 transitions. Word has length 143 [2021-05-06 11:57:24,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:24,701 INFO L480 AbstractCegarLoop]: Abstraction has 247 states and 251 transitions. [2021-05-06 11:57:24,701 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 85 states, 85 states have (on average 1.6352941176470588) internal successors, (139), 84 states have internal predecessors, (139), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:24,701 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 251 transitions. [2021-05-06 11:57:24,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-05-06 11:57:24,701 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:24,702 INFO L523 BasicCegarLoop]: trace histogram [52, 51, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:24,702 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable89 [2021-05-06 11:57:24,702 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:24,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:24,702 INFO L82 PathProgramCache]: Analyzing trace with hash 1745216537, now seen corresponding path program 30 times [2021-05-06 11:57:24,702 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:24,702 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [710588916] [2021-05-06 11:57:24,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:24,715 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:24,728 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:24,729 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:24,738 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:24,740 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:24,757 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:24,772 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:24,774 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:24,775 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:24,778 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:24,788 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:24,795 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:24,796 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:24,797 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:24,798 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:24,801 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:24,810 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:24,817 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 11:57:24,820 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:24,821 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:24,822 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:24,829 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:24,831 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:24,850 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:24,864 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:24,865 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:24,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:25,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:25,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:25,290 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 11:57:25,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:25,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:26,768 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:26,768 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [710588916] [2021-05-06 11:57:26,768 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [710588916] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:26,768 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:26,768 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [87] imperfect sequences [] total 87 [2021-05-06 11:57:26,768 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000252167] [2021-05-06 11:57:26,768 INFO L460 AbstractCegarLoop]: Interpolant automaton has 87 states [2021-05-06 11:57:26,768 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:26,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-05-06 11:57:26,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2331, Invalid=5151, Unknown=0, NotChecked=0, Total=7482 [2021-05-06 11:57:26,769 INFO L87 Difference]: Start difference. First operand 247 states and 251 transitions. Second operand has 87 states, 87 states have (on average 1.632183908045977) internal successors, (142), 86 states have internal predecessors, (142), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:33,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:33,189 INFO L93 Difference]: Finished difference Result 391 states and 405 transitions. [2021-05-06 11:57:33,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-05-06 11:57:33,190 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 1.632183908045977) internal successors, (142), 86 states have internal predecessors, (142), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 146 [2021-05-06 11:57:33,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:33,190 INFO L225 Difference]: With dead ends: 391 [2021-05-06 11:57:33,191 INFO L226 Difference]: Without dead ends: 254 [2021-05-06 11:57:33,192 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 169 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8368 ImplicationChecksByTransitivity, 5866.7ms TimeCoverageRelationStatistics Valid=6987, Invalid=22083, Unknown=0, NotChecked=0, Total=29070 [2021-05-06 11:57:33,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2021-05-06 11:57:33,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 152. [2021-05-06 11:57:33,199 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 11:57:33,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 155 transitions. [2021-05-06 11:57:33,200 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 155 transitions. Word has length 146 [2021-05-06 11:57:33,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:33,200 INFO L480 AbstractCegarLoop]: Abstraction has 152 states and 155 transitions. [2021-05-06 11:57:33,200 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 87 states, 87 states have (on average 1.632183908045977) internal successors, (142), 86 states have internal predecessors, (142), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:33,200 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 155 transitions. [2021-05-06 11:57:33,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-05-06 11:57:33,200 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:33,200 INFO L523 BasicCegarLoop]: trace histogram [54, 53, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:33,200 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92 [2021-05-06 11:57:33,201 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:33,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:33,201 INFO L82 PathProgramCache]: Analyzing trace with hash -469404576, now seen corresponding path program 31 times [2021-05-06 11:57:33,201 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:33,201 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [541724143] [2021-05-06 11:57:33,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:33,218 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:33,218 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:33,220 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:33,227 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:33,228 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:33,246 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:33,260 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:33,262 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:33,263 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:33,266 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:33,275 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:33,282 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:33,283 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:33,284 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:33,285 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:33,289 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:33,298 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:33,305 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:33,308 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:33,321 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:33,323 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:33,330 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:33,332 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:33,341 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:33,357 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 11:57:33,358 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:33,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:33,904 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:33,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:33,907 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:33,909 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:35,522 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:35,522 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [541724143] [2021-05-06 11:57:35,522 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [541724143] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:35,522 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:35,522 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [90] imperfect sequences [] total 90 [2021-05-06 11:57:35,522 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129190860] [2021-05-06 11:57:35,523 INFO L460 AbstractCegarLoop]: Interpolant automaton has 90 states [2021-05-06 11:57:35,523 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:35,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2021-05-06 11:57:35,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2619, Invalid=5937, Unknown=0, NotChecked=0, Total=8556 [2021-05-06 11:57:35,524 INFO L87 Difference]: Start difference. First operand 152 states and 155 transitions. Second operand has 90 states, 90 states have (on average 1.6333333333333333) internal successors, (147), 89 states have internal predecessors, (147), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:42,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:42,322 INFO L93 Difference]: Finished difference Result 405 states and 416 transitions. [2021-05-06 11:57:42,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-05-06 11:57:42,323 INFO L78 Accepts]: Start accepts. Automaton has has 90 states, 90 states have (on average 1.6333333333333333) internal successors, (147), 89 states have internal predecessors, (147), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 151 [2021-05-06 11:57:42,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:42,324 INFO L225 Difference]: With dead ends: 405 [2021-05-06 11:57:42,324 INFO L226 Difference]: Without dead ends: 261 [2021-05-06 11:57:42,325 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 178 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9539 ImplicationChecksByTransitivity, 6393.8ms TimeCoverageRelationStatistics Valid=7592, Invalid=24628, Unknown=0, NotChecked=0, Total=32220 [2021-05-06 11:57:42,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2021-05-06 11:57:42,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 261. [2021-05-06 11:57:42,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 256 states have (on average 1.01953125) internal successors, (261), 256 states have internal predecessors, (261), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:42,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 265 transitions. [2021-05-06 11:57:42,338 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 265 transitions. Word has length 151 [2021-05-06 11:57:42,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:42,338 INFO L480 AbstractCegarLoop]: Abstraction has 261 states and 265 transitions. [2021-05-06 11:57:42,338 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 90 states, 90 states have (on average 1.6333333333333333) internal successors, (147), 89 states have internal predecessors, (147), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:42,339 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 265 transitions. [2021-05-06 11:57:42,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2021-05-06 11:57:42,339 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:42,339 INFO L523 BasicCegarLoop]: trace histogram [55, 54, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:42,339 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95 [2021-05-06 11:57:42,339 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:42,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:42,340 INFO L82 PathProgramCache]: Analyzing trace with hash 1463008648, now seen corresponding path program 32 times [2021-05-06 11:57:42,340 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:42,340 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [886424522] [2021-05-06 11:57:42,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:42,346 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:42,359 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:42,360 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:42,368 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:42,370 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:42,378 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:42,392 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:42,394 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:42,395 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:42,398 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:42,408 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:42,415 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:42,415 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:42,418 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:42,419 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:42,423 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:42,433 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:42,440 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:42,444 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:42,458 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:42,459 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:42,469 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:42,471 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:42,479 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:42,493 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:42,494 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:42,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:43,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:43,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:43,111 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:43,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:44,755 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:44,755 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [886424522] [2021-05-06 11:57:44,755 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [886424522] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:44,755 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:44,755 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [92] imperfect sequences [] total 92 [2021-05-06 11:57:44,755 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084521407] [2021-05-06 11:57:44,755 INFO L460 AbstractCegarLoop]: Interpolant automaton has 92 states [2021-05-06 11:57:44,756 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:44,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2021-05-06 11:57:44,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2747, Invalid=6183, Unknown=0, NotChecked=0, Total=8930 [2021-05-06 11:57:44,756 INFO L87 Difference]: Start difference. First operand 261 states and 265 transitions. Second operand has 92 states, 92 states have (on average 1.6304347826086956) internal successors, (150), 91 states have internal predecessors, (150), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:51,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:51,964 INFO L93 Difference]: Finished difference Result 409 states and 419 transitions. [2021-05-06 11:57:51,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2021-05-06 11:57:51,964 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 92 states have (on average 1.6304347826086956) internal successors, (150), 91 states have internal predecessors, (150), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 154 [2021-05-06 11:57:51,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:51,965 INFO L225 Difference]: With dead ends: 409 [2021-05-06 11:57:51,965 INFO L226 Difference]: Without dead ends: 264 [2021-05-06 11:57:51,966 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9990 ImplicationChecksByTransitivity, 6688.1ms TimeCoverageRelationStatistics Valid=7970, Invalid=25702, Unknown=0, NotChecked=0, Total=33672 [2021-05-06 11:57:51,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2021-05-06 11:57:51,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 264. [2021-05-06 11:57:51,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 264 states, 259 states have (on average 1.0193050193050193) internal successors, (264), 259 states have internal predecessors, (264), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:51,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 268 transitions. [2021-05-06 11:57:51,990 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 268 transitions. Word has length 154 [2021-05-06 11:57:51,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:51,990 INFO L480 AbstractCegarLoop]: Abstraction has 264 states and 268 transitions. [2021-05-06 11:57:51,991 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 92 states, 92 states have (on average 1.6304347826086956) internal successors, (150), 91 states have internal predecessors, (150), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:51,991 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 268 transitions. [2021-05-06 11:57:51,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-05-06 11:57:51,991 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:51,991 INFO L523 BasicCegarLoop]: trace histogram [56, 55, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:51,991 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable98 [2021-05-06 11:57:51,991 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:51,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:51,992 INFO L82 PathProgramCache]: Analyzing trace with hash 507447862, now seen corresponding path program 33 times [2021-05-06 11:57:51,992 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:51,992 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [691241416] [2021-05-06 11:57:51,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:51,997 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:52,010 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:52,011 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:52,018 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:52,020 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:52,028 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:52,043 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 11:57:52,049 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:52,050 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:52,054 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:52,064 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:52,072 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:52,073 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:52,074 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:52,075 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:52,079 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:52,088 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:52,096 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 11:57:52,099 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:52,100 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:52,101 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:52,109 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:52,111 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:52,134 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:52,150 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:52,151 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:52,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:52,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:52,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:52,735 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:52,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:52,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:54,520 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:54,521 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [691241416] [2021-05-06 11:57:54,521 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [691241416] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:54,521 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:54,521 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [94] imperfect sequences [] total 94 [2021-05-06 11:57:54,521 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528260382] [2021-05-06 11:57:54,521 INFO L460 AbstractCegarLoop]: Interpolant automaton has 94 states [2021-05-06 11:57:54,521 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:54,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2021-05-06 11:57:54,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2740, Invalid=6002, Unknown=0, NotChecked=0, Total=8742 [2021-05-06 11:57:54,522 INFO L87 Difference]: Start difference. First operand 264 states and 268 transitions. Second operand has 94 states, 94 states have (on average 1.627659574468085) internal successors, (153), 93 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 11:58:01,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:01,879 INFO L93 Difference]: Finished difference Result 419 states and 435 transitions. [2021-05-06 11:58:01,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2021-05-06 11:58:01,879 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 1.627659574468085) internal successors, (153), 93 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 11:58:01,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:01,880 INFO L225 Difference]: With dead ends: 419 [2021-05-06 11:58:01,880 INFO L226 Difference]: Without dead ends: 273 [2021-05-06 11:58:01,882 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9860 ImplicationChecksByTransitivity, 6989.2ms TimeCoverageRelationStatistics Valid=8214, Invalid=25826, Unknown=0, NotChecked=0, Total=34040 [2021-05-06 11:58:01,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2021-05-06 11:58:01,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 163. [2021-05-06 11:58:01,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 158 states have (on average 1.0253164556962024) internal successors, (162), 158 states have internal predecessors, (162), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:01,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 166 transitions. [2021-05-06 11:58:01,890 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 166 transitions. Word has length 157 [2021-05-06 11:58:01,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:01,890 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 166 transitions. [2021-05-06 11:58:01,890 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 94 states, 94 states have (on average 1.627659574468085) internal successors, (153), 93 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 11:58:01,890 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 166 transitions. [2021-05-06 11:58:01,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2021-05-06 11:58:01,891 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:01,891 INFO L523 BasicCegarLoop]: trace histogram [58, 57, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:01,891 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable101 [2021-05-06 11:58:01,891 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:01,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:01,891 INFO L82 PathProgramCache]: Analyzing trace with hash -940558281, now seen corresponding path program 34 times [2021-05-06 11:58:01,891 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:01,891 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1607172264] [2021-05-06 11:58:01,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:01,897 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:01,898 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:01,899 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:01,906 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:01,908 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:01,927 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:01,940 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 11:58:01,942 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:01,947 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:01,951 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:01,955 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:01,962 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:01,969 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:01,970 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:01,971 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:01,974 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:01,983 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:01,990 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 11:58:01,993 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:01,994 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:01,995 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:02,007 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:02,010 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:02,038 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:02,052 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:02,053 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:02,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:02,637 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:02,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:02,640 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 11:58:02,641 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:02,642 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:04,429 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:04,429 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1607172264] [2021-05-06 11:58:04,429 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1607172264] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:04,429 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:04,429 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [97] imperfect sequences [] total 97 [2021-05-06 11:58:04,429 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355488401] [2021-05-06 11:58:04,429 INFO L460 AbstractCegarLoop]: Interpolant automaton has 97 states [2021-05-06 11:58:04,429 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:04,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-05-06 11:58:04,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2909, Invalid=6403, Unknown=0, NotChecked=0, Total=9312 [2021-05-06 11:58:04,430 INFO L87 Difference]: Start difference. First operand 163 states and 166 transitions. Second operand has 97 states, 97 states have (on average 1.6288659793814433) internal successors, (158), 96 states have internal predecessors, (158), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:12,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:12,387 INFO L93 Difference]: Finished difference Result 323 states and 334 transitions. [2021-05-06 11:58:12,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2021-05-06 11:58:12,388 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 1.6288659793814433) internal successors, (158), 96 states have internal predecessors, (158), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 162 [2021-05-06 11:58:12,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:12,389 INFO L225 Difference]: With dead ends: 323 [2021-05-06 11:58:12,389 INFO L226 Difference]: Without dead ends: 168 [2021-05-06 11:58:12,390 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 65 SyntacticMatches, 1 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10515 ImplicationChecksByTransitivity, 7298.0ms TimeCoverageRelationStatistics Valid=8721, Invalid=27569, Unknown=0, NotChecked=0, Total=36290 [2021-05-06 11:58:12,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-05-06 11:58:12,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2021-05-06 11:58:12,398 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 11:58:12,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 171 transitions. [2021-05-06 11:58:12,398 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 171 transitions. Word has length 162 [2021-05-06 11:58:12,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:12,398 INFO L480 AbstractCegarLoop]: Abstraction has 168 states and 171 transitions. [2021-05-06 11:58:12,399 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 97 states, 97 states have (on average 1.6288659793814433) internal successors, (158), 96 states have internal predecessors, (158), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:12,399 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 171 transitions. [2021-05-06 11:58:12,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-05-06 11:58:12,399 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:12,399 INFO L523 BasicCegarLoop]: trace histogram [60, 59, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:12,399 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable104 [2021-05-06 11:58:12,399 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:12,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:12,400 INFO L82 PathProgramCache]: Analyzing trace with hash -614533118, now seen corresponding path program 35 times [2021-05-06 11:58:12,400 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:12,400 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1665310434] [2021-05-06 11:58:12,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:12,418 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:12,418 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:12,420 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:12,426 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:12,428 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:12,448 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:12,462 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:12,464 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:12,470 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:12,474 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:12,477 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:12,484 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:12,485 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:12,487 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:12,493 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:12,498 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:12,503 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:12,511 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:12,514 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:12,514 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:12,515 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:12,524 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:12,526 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:12,548 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:12,563 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:12,564 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:12,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:13,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:13,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:13,171 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 11:58:13,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:13,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:15,278 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:15,278 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1665310434] [2021-05-06 11:58:15,278 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1665310434] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:15,278 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:15,278 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [100] imperfect sequences [] total 100 [2021-05-06 11:58:15,278 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60570320] [2021-05-06 11:58:15,279 INFO L460 AbstractCegarLoop]: Interpolant automaton has 100 states [2021-05-06 11:58:15,279 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:15,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2021-05-06 11:58:15,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3083, Invalid=6817, Unknown=0, NotChecked=0, Total=9900 [2021-05-06 11:58:15,280 INFO L87 Difference]: Start difference. First operand 168 states and 171 transitions. Second operand has 100 states, 100 states have (on average 1.63) internal successors, (163), 99 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:23,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:23,992 INFO L93 Difference]: Finished difference Result 333 states and 344 transitions. [2021-05-06 11:58:23,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-05-06 11:58:23,993 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 100 states have (on average 1.63) internal successors, (163), 99 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 167 [2021-05-06 11:58:23,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:23,993 INFO L225 Difference]: With dead ends: 333 [2021-05-06 11:58:23,994 INFO L226 Difference]: Without dead ends: 173 [2021-05-06 11:58:23,995 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11191 ImplicationChecksByTransitivity, 8040.9ms TimeCoverageRelationStatistics Valid=9243, Invalid=29369, Unknown=0, NotChecked=0, Total=38612 [2021-05-06 11:58:23,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-05-06 11:58:24,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 173. [2021-05-06 11:58:24,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 168 states have (on average 1.0238095238095237) internal successors, (172), 168 states have internal predecessors, (172), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:24,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 176 transitions. [2021-05-06 11:58:24,004 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 176 transitions. Word has length 167 [2021-05-06 11:58:24,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:24,004 INFO L480 AbstractCegarLoop]: Abstraction has 173 states and 176 transitions. [2021-05-06 11:58:24,004 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 100 states, 100 states have (on average 1.63) internal successors, (163), 99 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:24,004 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 176 transitions. [2021-05-06 11:58:24,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2021-05-06 11:58:24,005 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:24,005 INFO L523 BasicCegarLoop]: trace histogram [62, 61, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:24,005 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable107 [2021-05-06 11:58:24,005 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:24,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:24,005 INFO L82 PathProgramCache]: Analyzing trace with hash -358371477, now seen corresponding path program 36 times [2021-05-06 11:58:24,005 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:24,005 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [778149120] [2021-05-06 11:58:24,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:24,026 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:24,026 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:24,027 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:24,036 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:24,038 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:24,059 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:24,075 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:24,077 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:24,078 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:24,082 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:24,091 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:24,099 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:24,100 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:24,101 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:24,102 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:24,106 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:24,115 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:24,123 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:24,126 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:24,127 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:24,128 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:24,136 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:24,138 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:24,157 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:24,171 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 11:58:24,172 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:24,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:24,781 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:24,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:24,786 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:58:24,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:24,787 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:26,806 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:26,806 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [778149120] [2021-05-06 11:58:26,806 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [778149120] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:26,806 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:26,807 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [103] imperfect sequences [] total 103 [2021-05-06 11:58:26,807 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [957192876] [2021-05-06 11:58:26,807 INFO L460 AbstractCegarLoop]: Interpolant automaton has 103 states [2021-05-06 11:58:26,807 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:26,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2021-05-06 11:58:26,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3262, Invalid=7244, Unknown=0, NotChecked=0, Total=10506 [2021-05-06 11:58:26,808 INFO L87 Difference]: Start difference. First operand 173 states and 176 transitions. Second operand has 103 states, 103 states have (on average 1.6310679611650485) internal successors, (168), 102 states have internal predecessors, (168), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:35,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:35,361 INFO L93 Difference]: Finished difference Result 343 states and 354 transitions. [2021-05-06 11:58:35,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2021-05-06 11:58:35,361 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 1.6310679611650485) internal successors, (168), 102 states have internal predecessors, (168), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 172 [2021-05-06 11:58:35,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:35,362 INFO L225 Difference]: With dead ends: 343 [2021-05-06 11:58:35,362 INFO L226 Difference]: Without dead ends: 178 [2021-05-06 11:58:35,363 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 201 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11852 ImplicationChecksByTransitivity, 7995.7ms TimeCoverageRelationStatistics Valid=9780, Invalid=31226, Unknown=0, NotChecked=0, Total=41006 [2021-05-06 11:58:35,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2021-05-06 11:58:35,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 178. [2021-05-06 11:58:35,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 173 states have (on average 1.023121387283237) internal successors, (177), 173 states have internal predecessors, (177), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:35,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 181 transitions. [2021-05-06 11:58:35,378 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 181 transitions. Word has length 172 [2021-05-06 11:58:35,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:35,378 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 181 transitions. [2021-05-06 11:58:35,378 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 103 states, 103 states have (on average 1.6310679611650485) internal successors, (168), 102 states have internal predecessors, (168), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:35,378 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 181 transitions. [2021-05-06 11:58:35,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2021-05-06 11:58:35,378 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:35,379 INFO L523 BasicCegarLoop]: trace histogram [64, 63, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:35,379 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable110 [2021-05-06 11:58:35,379 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:35,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:35,379 INFO L82 PathProgramCache]: Analyzing trace with hash -1752962098, now seen corresponding path program 37 times [2021-05-06 11:58:35,379 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:35,379 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1788031259] [2021-05-06 11:58:35,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:35,389 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:35,401 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:35,403 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:35,411 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:35,414 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:35,423 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:35,438 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:35,440 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:35,441 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:35,446 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:35,457 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:35,464 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:35,465 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:35,467 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:35,472 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:35,476 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:35,480 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:35,487 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:35,490 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:35,506 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:35,508 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:35,516 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:35,518 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:35,527 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:35,541 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 11:58:35,542 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:35,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:36,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:36,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:36,181 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:58:36,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:36,182 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:38,467 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:38,467 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1788031259] [2021-05-06 11:58:38,468 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1788031259] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:38,468 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:38,468 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [106] imperfect sequences [] total 106 [2021-05-06 11:58:38,468 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106393549] [2021-05-06 11:58:38,468 INFO L460 AbstractCegarLoop]: Interpolant automaton has 106 states [2021-05-06 11:58:38,468 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:38,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2021-05-06 11:58:38,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3446, Invalid=7684, Unknown=0, NotChecked=0, Total=11130 [2021-05-06 11:58:38,469 INFO L87 Difference]: Start difference. First operand 178 states and 181 transitions. Second operand has 106 states, 106 states have (on average 1.6320754716981132) internal successors, (173), 105 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 11:58:47,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:47,454 INFO L93 Difference]: Finished difference Result 353 states and 364 transitions. [2021-05-06 11:58:47,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2021-05-06 11:58:47,454 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 106 states have (on average 1.6320754716981132) internal successors, (173), 105 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 11:58:47,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:47,455 INFO L225 Difference]: With dead ends: 353 [2021-05-06 11:58:47,455 INFO L226 Difference]: Without dead ends: 183 [2021-05-06 11:58:47,457 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12606 ImplicationChecksByTransitivity, 8507.0ms TimeCoverageRelationStatistics Valid=10332, Invalid=33140, Unknown=0, NotChecked=0, Total=43472 [2021-05-06 11:58:47,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2021-05-06 11:58:47,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 183. [2021-05-06 11:58:47,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 178 states have (on average 1.0224719101123596) internal successors, (182), 178 states have internal predecessors, (182), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:47,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 186 transitions. [2021-05-06 11:58:47,466 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 186 transitions. Word has length 177 [2021-05-06 11:58:47,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:47,466 INFO L480 AbstractCegarLoop]: Abstraction has 183 states and 186 transitions. [2021-05-06 11:58:47,466 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 106 states, 106 states have (on average 1.6320754716981132) internal successors, (173), 105 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 11:58:47,466 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 186 transitions. [2021-05-06 11:58:47,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2021-05-06 11:58:47,467 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:47,467 INFO L523 BasicCegarLoop]: trace histogram [66, 65, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:47,467 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable113 [2021-05-06 11:58:47,467 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:47,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:47,467 INFO L82 PathProgramCache]: Analyzing trace with hash 510820511, now seen corresponding path program 38 times [2021-05-06 11:58:47,467 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:47,467 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1179736812] [2021-05-06 11:58:47,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:47,474 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:47,475 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:47,477 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:47,484 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:47,486 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:47,504 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:47,518 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 11:58:47,520 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:47,521 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:47,525 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:47,535 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:47,542 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:47,543 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:47,544 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:47,545 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:47,548 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:47,557 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:47,564 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:47,567 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:47,568 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:47,569 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:47,578 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:47,580 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:47,599 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:47,614 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:47,616 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:47,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:48,286 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:48,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:48,297 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 11:58:48,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:48,299 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:50,581 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:50,581 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1179736812] [2021-05-06 11:58:50,581 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1179736812] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:50,581 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:50,581 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [109] imperfect sequences [] total 109 [2021-05-06 11:58:50,581 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732164129] [2021-05-06 11:58:50,582 INFO L460 AbstractCegarLoop]: Interpolant automaton has 109 states [2021-05-06 11:58:50,582 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:50,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2021-05-06 11:58:50,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3635, Invalid=8137, Unknown=0, NotChecked=0, Total=11772 [2021-05-06 11:58:50,583 INFO L87 Difference]: Start difference. First operand 183 states and 186 transitions. Second operand has 109 states, 109 states have (on average 1.6330275229357798) internal successors, (178), 108 states have internal predecessors, (178), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:00,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:00,104 INFO L93 Difference]: Finished difference Result 363 states and 374 transitions. [2021-05-06 11:59:00,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2021-05-06 11:59:00,104 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 109 states have (on average 1.6330275229357798) internal successors, (178), 108 states have internal predecessors, (178), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 182 [2021-05-06 11:59:00,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:00,105 INFO L225 Difference]: With dead ends: 363 [2021-05-06 11:59:00,105 INFO L226 Difference]: Without dead ends: 188 [2021-05-06 11:59:00,107 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 213 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13307 ImplicationChecksByTransitivity, 8869.8ms TimeCoverageRelationStatistics Valid=10899, Invalid=35111, Unknown=0, NotChecked=0, Total=46010 [2021-05-06 11:59:00,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-05-06 11:59:00,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 188. [2021-05-06 11:59:00,115 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 11:59:00,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 191 transitions. [2021-05-06 11:59:00,116 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 191 transitions. Word has length 182 [2021-05-06 11:59:00,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:00,116 INFO L480 AbstractCegarLoop]: Abstraction has 188 states and 191 transitions. [2021-05-06 11:59:00,116 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 109 states, 109 states have (on average 1.6330275229357798) internal successors, (178), 108 states have internal predecessors, (178), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:00,116 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 191 transitions. [2021-05-06 11:59:00,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2021-05-06 11:59:00,117 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:00,117 INFO L523 BasicCegarLoop]: trace histogram [68, 67, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:00,117 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable116 [2021-05-06 11:59:00,117 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:00,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:00,117 INFO L82 PathProgramCache]: Analyzing trace with hash 356328858, now seen corresponding path program 39 times [2021-05-06 11:59:00,117 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:00,117 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1600059596] [2021-05-06 11:59:00,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:00,123 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:00,123 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:00,124 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:00,132 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:00,134 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:00,153 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:00,167 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:00,169 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:00,174 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:00,178 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:00,182 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:00,188 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 11:59:00,189 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:00,190 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:00,200 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:00,203 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:00,207 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:00,214 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:00,217 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:00,230 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:00,231 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:00,237 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:00,239 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:00,247 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:00,261 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:00,261 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:00,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:00,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:00,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:00,950 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:59:00,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:00,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:03,313 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:03,313 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1600059596] [2021-05-06 11:59:03,313 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1600059596] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:03,313 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:03,313 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [112] imperfect sequences [] total 112 [2021-05-06 11:59:03,313 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923662017] [2021-05-06 11:59:03,313 INFO L460 AbstractCegarLoop]: Interpolant automaton has 112 states [2021-05-06 11:59:03,313 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:03,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2021-05-06 11:59:03,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3829, Invalid=8603, Unknown=0, NotChecked=0, Total=12432 [2021-05-06 11:59:03,314 INFO L87 Difference]: Start difference. First operand 188 states and 191 transitions. Second operand has 112 states, 112 states have (on average 1.6339285714285714) internal successors, (183), 111 states have internal predecessors, (183), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:13,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:13,778 INFO L93 Difference]: Finished difference Result 373 states and 384 transitions. [2021-05-06 11:59:13,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2021-05-06 11:59:13,778 INFO L78 Accepts]: Start accepts. Automaton has has 112 states, 112 states have (on average 1.6339285714285714) internal successors, (183), 111 states have internal predecessors, (183), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 187 [2021-05-06 11:59:13,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:13,779 INFO L225 Difference]: With dead ends: 373 [2021-05-06 11:59:13,779 INFO L226 Difference]: Without dead ends: 193 [2021-05-06 11:59:13,781 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 75 SyntacticMatches, 1 SemanticMatches, 219 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14105 ImplicationChecksByTransitivity, 9417.7ms TimeCoverageRelationStatistics Valid=11481, Invalid=37139, Unknown=0, NotChecked=0, Total=48620 [2021-05-06 11:59:13,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-05-06 11:59:13,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 193. [2021-05-06 11:59:13,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 188 states have (on average 1.0212765957446808) internal successors, (192), 188 states have internal predecessors, (192), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:13,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 196 transitions. [2021-05-06 11:59:13,790 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 196 transitions. Word has length 187 [2021-05-06 11:59:13,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:13,790 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 196 transitions. [2021-05-06 11:59:13,790 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 112 states, 112 states have (on average 1.6339285714285714) internal successors, (183), 111 states have internal predecessors, (183), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:13,791 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 196 transitions. [2021-05-06 11:59:13,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2021-05-06 11:59:13,791 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:13,791 INFO L523 BasicCegarLoop]: trace histogram [70, 69, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:13,791 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable119 [2021-05-06 11:59:13,791 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:13,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:13,792 INFO L82 PathProgramCache]: Analyzing trace with hash -810718253, now seen corresponding path program 40 times [2021-05-06 11:59:13,792 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:13,792 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [413069641] [2021-05-06 11:59:13,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:13,802 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:13,803 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:13,803 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:13,812 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:13,814 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:13,831 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:13,844 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 11:59:13,849 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:13,854 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:13,858 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:13,861 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:13,868 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 11:59:13,869 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:13,870 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:13,871 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:13,875 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:13,901 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:13,908 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:13,911 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:13,912 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:13,913 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:13,920 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:13,921 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:13,940 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:13,953 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 11:59:13,954 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:13,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:14,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:14,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:14,757 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:59:14,758 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:17,318 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:17,318 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [413069641] [2021-05-06 11:59:17,318 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [413069641] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:17,318 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:17,318 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [115] imperfect sequences [] total 115 [2021-05-06 11:59:17,319 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926714617] [2021-05-06 11:59:17,319 INFO L460 AbstractCegarLoop]: Interpolant automaton has 115 states [2021-05-06 11:59:17,319 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:17,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2021-05-06 11:59:17,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4194, Invalid=9612, Unknown=0, NotChecked=0, Total=13806 [2021-05-06 11:59:17,320 INFO L87 Difference]: Start difference. First operand 193 states and 196 transitions. Second operand has 115 states, 115 states have (on average 1.6347826086956523) internal successors, (188), 114 states have internal predecessors, (188), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:27,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:27,937 INFO L93 Difference]: Finished difference Result 519 states and 530 transitions. [2021-05-06 11:59:27,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2021-05-06 11:59:27,937 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 115 states have (on average 1.6347826086956523) internal successors, (188), 114 states have internal predecessors, (188), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 192 [2021-05-06 11:59:27,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:27,938 INFO L225 Difference]: With dead ends: 519 [2021-05-06 11:59:27,938 INFO L226 Difference]: Without dead ends: 334 [2021-05-06 11:59:27,940 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 228 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15617 ImplicationChecksByTransitivity, 9893.2ms TimeCoverageRelationStatistics Valid=12249, Invalid=40421, Unknown=0, NotChecked=0, Total=52670 [2021-05-06 11:59:27,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2021-05-06 11:59:27,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 334. [2021-05-06 11:59:27,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 334 states, 329 states have (on average 1.0151975683890577) internal successors, (334), 329 states have internal predecessors, (334), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:27,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 338 transitions. [2021-05-06 11:59:27,957 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 338 transitions. Word has length 192 [2021-05-06 11:59:27,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:27,957 INFO L480 AbstractCegarLoop]: Abstraction has 334 states and 338 transitions. [2021-05-06 11:59:27,957 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 115 states, 115 states have (on average 1.6347826086956523) internal successors, (188), 114 states have internal predecessors, (188), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:27,957 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 338 transitions. [2021-05-06 11:59:27,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2021-05-06 11:59:27,958 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:27,958 INFO L523 BasicCegarLoop]: trace histogram [71, 70, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:27,958 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable122 [2021-05-06 11:59:27,958 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:27,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:27,958 INFO L82 PathProgramCache]: Analyzing trace with hash 1864157451, now seen corresponding path program 41 times [2021-05-06 11:59:27,958 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:27,958 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1525374041] [2021-05-06 11:59:27,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:27,965 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:27,965 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:27,966 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:27,974 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:27,975 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:27,992 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:28,004 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:28,007 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:28,012 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:28,016 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:28,020 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:28,027 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:28,027 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:28,030 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:28,036 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:28,039 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:28,043 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:28,051 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:28,054 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:28,069 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:28,071 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:28,078 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:28,080 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:28,088 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:28,102 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:28,103 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:28,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:28,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:28,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:28,870 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:59:28,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:28,871 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:31,404 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:31,404 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1525374041] [2021-05-06 11:59:31,405 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1525374041] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:31,405 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:31,405 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [117] imperfect sequences [] total 117 [2021-05-06 11:59:31,405 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304815931] [2021-05-06 11:59:31,405 INFO L460 AbstractCegarLoop]: Interpolant automaton has 117 states [2021-05-06 11:59:31,405 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:31,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 117 interpolants. [2021-05-06 11:59:31,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4187, Invalid=9385, Unknown=0, NotChecked=0, Total=13572 [2021-05-06 11:59:31,406 INFO L87 Difference]: Start difference. First operand 334 states and 338 transitions. Second operand has 117 states, 117 states have (on average 1.6324786324786325) internal successors, (191), 116 states have internal predecessors, (191), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:42,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:42,201 INFO L93 Difference]: Finished difference Result 527 states and 541 transitions. [2021-05-06 11:59:42,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2021-05-06 11:59:42,201 INFO L78 Accepts]: Start accepts. Automaton has has 117 states, 117 states have (on average 1.6324786324786325) internal successors, (191), 116 states have internal predecessors, (191), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 195 [2021-05-06 11:59:42,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:42,202 INFO L225 Difference]: With dead ends: 527 [2021-05-06 11:59:42,202 INFO L226 Difference]: Without dead ends: 341 [2021-05-06 11:59:42,204 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 229 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15450 ImplicationChecksByTransitivity, 10012.9ms TimeCoverageRelationStatistics Valid=12555, Invalid=40575, Unknown=0, NotChecked=0, Total=53130 [2021-05-06 11:59:42,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 341 states. [2021-05-06 11:59:42,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 341 to 201. [2021-05-06 11:59:42,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 196 states have (on average 1.0204081632653061) internal successors, (200), 196 states have internal predecessors, (200), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:42,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 204 transitions. [2021-05-06 11:59:42,214 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 204 transitions. Word has length 195 [2021-05-06 11:59:42,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:42,214 INFO L480 AbstractCegarLoop]: Abstraction has 201 states and 204 transitions. [2021-05-06 11:59:42,214 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 117 states, 117 states have (on average 1.6324786324786325) internal successors, (191), 116 states have internal predecessors, (191), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:42,214 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 204 transitions. [2021-05-06 11:59:42,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2021-05-06 11:59:42,215 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:42,215 INFO L523 BasicCegarLoop]: trace histogram [73, 72, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:42,215 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable125 [2021-05-06 11:59:42,215 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:42,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:42,215 INFO L82 PathProgramCache]: Analyzing trace with hash -1014510462, now seen corresponding path program 42 times [2021-05-06 11:59:42,216 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:42,216 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [288491339] [2021-05-06 11:59:42,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:42,221 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:42,222 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:42,223 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:42,230 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:42,232 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:42,250 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:42,264 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:42,266 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:42,272 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:42,275 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:42,279 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:42,286 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:42,286 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:42,288 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:42,293 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:42,297 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:42,301 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:42,307 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:42,310 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:42,311 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:42,312 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:42,319 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:42,321 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:42,352 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:42,366 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:42,367 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:42,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:43,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:43,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:43,104 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:59:43,108 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:43,110 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:45,774 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:45,774 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [288491339] [2021-05-06 11:59:45,775 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [288491339] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:45,775 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:45,775 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [120] imperfect sequences [] total 120 [2021-05-06 11:59:45,775 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [157373489] [2021-05-06 11:59:45,775 INFO L460 AbstractCegarLoop]: Interpolant automaton has 120 states [2021-05-06 11:59:45,775 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:45,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2021-05-06 11:59:45,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4395, Invalid=9885, Unknown=0, NotChecked=0, Total=14280 [2021-05-06 11:59:45,776 INFO L87 Difference]: Start difference. First operand 201 states and 204 transitions. Second operand has 120 states, 120 states have (on average 1.6333333333333333) internal successors, (196), 119 states have internal predecessors, (196), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:57,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:57,110 INFO L93 Difference]: Finished difference Result 399 states and 410 transitions. [2021-05-06 11:59:57,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2021-05-06 11:59:57,110 INFO L78 Accepts]: Start accepts. Automaton has has 120 states, 120 states have (on average 1.6333333333333333) internal successors, (196), 119 states have internal predecessors, (196), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 200 [2021-05-06 11:59:57,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:57,111 INFO L225 Difference]: With dead ends: 399 [2021-05-06 11:59:57,111 INFO L226 Difference]: Without dead ends: 206 [2021-05-06 11:59:57,113 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 80 SyntacticMatches, 1 SemanticMatches, 235 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16267 ImplicationChecksByTransitivity, 10395.1ms TimeCoverageRelationStatistics Valid=13179, Invalid=42753, Unknown=0, NotChecked=0, Total=55932 [2021-05-06 11:59:57,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2021-05-06 11:59:57,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 206. [2021-05-06 11:59:57,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 201 states have (on average 1.0199004975124377) internal successors, (205), 201 states have internal predecessors, (205), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:57,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 209 transitions. [2021-05-06 11:59:57,122 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 209 transitions. Word has length 200 [2021-05-06 11:59:57,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:57,122 INFO L480 AbstractCegarLoop]: Abstraction has 206 states and 209 transitions. [2021-05-06 11:59:57,123 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 120 states, 120 states have (on average 1.6333333333333333) internal successors, (196), 119 states have internal predecessors, (196), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:57,123 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 209 transitions. [2021-05-06 11:59:57,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2021-05-06 11:59:57,123 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:57,123 INFO L523 BasicCegarLoop]: trace histogram [75, 74, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:57,123 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable128 [2021-05-06 11:59:57,123 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:57,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:57,124 INFO L82 PathProgramCache]: Analyzing trace with hash -1340881769, now seen corresponding path program 43 times [2021-05-06 11:59:57,124 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:57,124 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [30062595] [2021-05-06 11:59:57,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:57,130 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:57,143 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:57,145 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:57,152 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:57,154 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:57,162 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:57,175 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:57,178 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:57,178 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:57,182 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:57,191 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:57,198 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 11:59:57,198 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:57,200 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:57,200 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:57,204 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:57,212 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:57,219 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:57,222 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:57,223 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:57,224 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:57,231 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:57,233 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:57,251 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:57,265 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:57,266 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:57,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:58,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:58,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:58,161 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:59:58,161 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:58,163 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:00,967 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:00,967 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [30062595] [2021-05-06 12:00:00,967 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [30062595] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:00,967 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:00,967 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [123] imperfect sequences [] total 123 [2021-05-06 12:00:00,967 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882588365] [2021-05-06 12:00:00,967 INFO L460 AbstractCegarLoop]: Interpolant automaton has 123 states [2021-05-06 12:00:00,967 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:00,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2021-05-06 12:00:00,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4608, Invalid=10398, Unknown=0, NotChecked=0, Total=15006 [2021-05-06 12:00:00,969 INFO L87 Difference]: Start difference. First operand 206 states and 209 transitions. Second operand has 123 states, 123 states have (on average 1.6341463414634145) internal successors, (201), 122 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 12:00:13,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:13,701 INFO L93 Difference]: Finished difference Result 409 states and 420 transitions. [2021-05-06 12:00:13,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2021-05-06 12:00:13,701 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 1.6341463414634145) internal successors, (201), 122 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 12:00:13,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:13,702 INFO L225 Difference]: With dead ends: 409 [2021-05-06 12:00:13,702 INFO L226 Difference]: Without dead ends: 211 [2021-05-06 12:00:13,712 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 324 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 241 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17105 ImplicationChecksByTransitivity, 11503.6ms TimeCoverageRelationStatistics Valid=13818, Invalid=44988, Unknown=0, NotChecked=0, Total=58806 [2021-05-06 12:00:13,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-05-06 12:00:13,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 211. [2021-05-06 12:00:13,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 206 states have (on average 1.0194174757281553) internal successors, (210), 206 states have internal predecessors, (210), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:13,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 214 transitions. [2021-05-06 12:00:13,724 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 214 transitions. Word has length 205 [2021-05-06 12:00:13,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:13,724 INFO L480 AbstractCegarLoop]: Abstraction has 211 states and 214 transitions. [2021-05-06 12:00:13,724 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 123 states, 123 states have (on average 1.6341463414634145) internal successors, (201), 122 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 12:00:13,724 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 214 transitions. [2021-05-06 12:00:13,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 211 [2021-05-06 12:00:13,725 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:13,725 INFO L523 BasicCegarLoop]: trace histogram [77, 76, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:13,725 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable131 [2021-05-06 12:00:13,725 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:13,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:13,726 INFO L82 PathProgramCache]: Analyzing trace with hash 2066304502, now seen corresponding path program 44 times [2021-05-06 12:00:13,726 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:13,726 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [676888615] [2021-05-06 12:00:13,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:13,731 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:13,732 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:13,733 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:13,740 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:13,741 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:13,758 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:13,772 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:13,775 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:00:13,781 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:13,786 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:13,790 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:00:13,797 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:13,798 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:13,800 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:00:13,806 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:13,809 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:13,813 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:00:13,820 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:13,823 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:13,824 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:13,825 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:13,832 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:13,834 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:13,853 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:13,867 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:13,868 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:13,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:14,735 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:14,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:14,738 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:00:14,739 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:14,740 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:18,036 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:18,037 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [676888615] [2021-05-06 12:00:18,037 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [676888615] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:18,037 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:18,037 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [126] imperfect sequences [] total 126 [2021-05-06 12:00:18,037 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311803353] [2021-05-06 12:00:18,037 INFO L460 AbstractCegarLoop]: Interpolant automaton has 126 states [2021-05-06 12:00:18,037 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:18,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 126 interpolants. [2021-05-06 12:00:18,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4826, Invalid=10924, Unknown=0, NotChecked=0, Total=15750 [2021-05-06 12:00:18,039 INFO L87 Difference]: Start difference. First operand 211 states and 214 transitions. Second operand has 126 states, 126 states have (on average 1.6349206349206349) internal successors, (206), 125 states have internal predecessors, (206), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:31,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:31,204 INFO L93 Difference]: Finished difference Result 419 states and 430 transitions. [2021-05-06 12:00:31,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2021-05-06 12:00:31,204 INFO L78 Accepts]: Start accepts. Automaton has has 126 states, 126 states have (on average 1.6349206349206349) internal successors, (206), 125 states have internal predecessors, (206), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 210 [2021-05-06 12:00:31,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:31,205 INFO L225 Difference]: With dead ends: 419 [2021-05-06 12:00:31,205 INFO L226 Difference]: Without dead ends: 216 [2021-05-06 12:00:31,207 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 247 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17920 ImplicationChecksByTransitivity, 12199.4ms TimeCoverageRelationStatistics Valid=14472, Invalid=47280, Unknown=0, NotChecked=0, Total=61752 [2021-05-06 12:00:31,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2021-05-06 12:00:31,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 216. [2021-05-06 12:00:31,218 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 12:00:31,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 219 transitions. [2021-05-06 12:00:31,218 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 219 transitions. Word has length 210 [2021-05-06 12:00:31,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:31,218 INFO L480 AbstractCegarLoop]: Abstraction has 216 states and 219 transitions. [2021-05-06 12:00:31,218 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 126 states, 126 states have (on average 1.6349206349206349) internal successors, (206), 125 states have internal predecessors, (206), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:31,218 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 219 transitions. [2021-05-06 12:00:31,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2021-05-06 12:00:31,219 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:31,219 INFO L523 BasicCegarLoop]: trace histogram [79, 78, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:31,219 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable134 [2021-05-06 12:00:31,219 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:31,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:31,220 INFO L82 PathProgramCache]: Analyzing trace with hash -565930461, now seen corresponding path program 45 times [2021-05-06 12:00:31,220 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:31,220 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [596030777] [2021-05-06 12:00:31,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:31,225 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:31,226 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:31,227 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:31,234 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:31,236 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:31,253 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:31,267 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 12:00:31,270 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:00:31,276 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:31,280 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:31,284 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:00:31,291 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:31,291 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:31,293 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:00:31,299 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:31,303 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:31,307 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:00:31,314 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:31,319 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:31,335 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:31,337 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:31,346 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:31,348 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:31,357 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:31,373 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:31,374 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:31,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:32,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:32,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:32,258 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:00:32,259 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:32,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:35,764 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:35,765 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [596030777] [2021-05-06 12:00:35,765 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [596030777] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:35,765 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:35,765 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [129] imperfect sequences [] total 129 [2021-05-06 12:00:35,765 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080525304] [2021-05-06 12:00:35,765 INFO L460 AbstractCegarLoop]: Interpolant automaton has 129 states [2021-05-06 12:00:35,765 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:35,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 129 interpolants. [2021-05-06 12:00:35,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5049, Invalid=11463, Unknown=0, NotChecked=0, Total=16512 [2021-05-06 12:00:35,766 INFO L87 Difference]: Start difference. First operand 216 states and 219 transitions. Second operand has 129 states, 129 states have (on average 1.6356589147286822) internal successors, (211), 128 states have internal predecessors, (211), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:49,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:49,645 INFO L93 Difference]: Finished difference Result 429 states and 440 transitions. [2021-05-06 12:00:49,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 129 states. [2021-05-06 12:00:49,646 INFO L78 Accepts]: Start accepts. Automaton has has 129 states, 129 states have (on average 1.6356589147286822) internal successors, (211), 128 states have internal predecessors, (211), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 215 [2021-05-06 12:00:49,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:49,646 INFO L225 Difference]: With dead ends: 429 [2021-05-06 12:00:49,646 INFO L226 Difference]: Without dead ends: 221 [2021-05-06 12:00:49,649 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 86 SyntacticMatches, 1 SemanticMatches, 253 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18844 ImplicationChecksByTransitivity, 12704.9ms TimeCoverageRelationStatistics Valid=15141, Invalid=49629, Unknown=0, NotChecked=0, Total=64770 [2021-05-06 12:00:49,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2021-05-06 12:00:49,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 221. [2021-05-06 12:00:49,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 221 states, 216 states have (on average 1.0185185185185186) internal successors, (220), 216 states have internal predecessors, (220), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:49,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 224 transitions. [2021-05-06 12:00:49,659 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 224 transitions. Word has length 215 [2021-05-06 12:00:49,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:49,659 INFO L480 AbstractCegarLoop]: Abstraction has 221 states and 224 transitions. [2021-05-06 12:00:49,659 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 129 states, 129 states have (on average 1.6356589147286822) internal successors, (211), 128 states have internal predecessors, (211), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:49,659 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 224 transitions. [2021-05-06 12:00:49,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 221 [2021-05-06 12:00:49,660 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:49,660 INFO L523 BasicCegarLoop]: trace histogram [81, 80, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:49,660 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable137 [2021-05-06 12:00:49,660 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:49,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:49,661 INFO L82 PathProgramCache]: Analyzing trace with hash 529750378, now seen corresponding path program 46 times [2021-05-06 12:00:49,661 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:49,661 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1056188911] [2021-05-06 12:00:49,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:49,671 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:49,685 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:49,686 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:49,693 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:49,695 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:49,704 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:49,718 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:49,721 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:00:49,721 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:49,725 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:49,735 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:00:49,743 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:49,743 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:49,745 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:00:49,746 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:49,750 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:49,759 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:00:49,766 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 12:00:49,781 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:49,797 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:49,798 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:49,807 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:49,809 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:49,819 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:49,834 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:49,835 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:49,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:50,770 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:50,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:50,773 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:00:50,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:50,775 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:54,198 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:54,198 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1056188911] [2021-05-06 12:00:54,198 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1056188911] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:54,198 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:54,198 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [132] imperfect sequences [] total 132 [2021-05-06 12:00:54,198 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075604277] [2021-05-06 12:00:54,199 INFO L460 AbstractCegarLoop]: Interpolant automaton has 132 states [2021-05-06 12:00:54,199 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:54,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2021-05-06 12:00:54,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5277, Invalid=12015, Unknown=0, NotChecked=0, Total=17292 [2021-05-06 12:00:54,200 INFO L87 Difference]: Start difference. First operand 221 states and 224 transitions. Second operand has 132 states, 132 states have (on average 1.6363636363636365) internal successors, (216), 131 states have internal predecessors, (216), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:08,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:01:08,437 INFO L93 Difference]: Finished difference Result 439 states and 450 transitions. [2021-05-06 12:01:08,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2021-05-06 12:01:08,438 INFO L78 Accepts]: Start accepts. Automaton has has 132 states, 132 states have (on average 1.6363636363636365) internal successors, (216), 131 states have internal predecessors, (216), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 220 [2021-05-06 12:01:08,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:01:08,439 INFO L225 Difference]: With dead ends: 439 [2021-05-06 12:01:08,439 INFO L226 Difference]: Without dead ends: 226 [2021-05-06 12:01:08,441 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 348 GetRequests, 88 SyntacticMatches, 1 SemanticMatches, 259 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19745 ImplicationChecksByTransitivity, 13047.0ms TimeCoverageRelationStatistics Valid=15825, Invalid=52035, Unknown=0, NotChecked=0, Total=67860 [2021-05-06 12:01:08,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2021-05-06 12:01:08,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 226. [2021-05-06 12:01:08,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 221 states have (on average 1.0180995475113122) internal successors, (225), 221 states have internal predecessors, (225), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:08,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 229 transitions. [2021-05-06 12:01:08,452 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 229 transitions. Word has length 220 [2021-05-06 12:01:08,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:01:08,452 INFO L480 AbstractCegarLoop]: Abstraction has 226 states and 229 transitions. [2021-05-06 12:01:08,452 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 132 states, 132 states have (on average 1.6363636363636365) internal successors, (216), 131 states have internal predecessors, (216), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:08,452 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 229 transitions. [2021-05-06 12:01:08,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2021-05-06 12:01:08,453 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:01:08,453 INFO L523 BasicCegarLoop]: trace histogram [83, 82, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:01:08,453 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable140 [2021-05-06 12:01:08,453 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:01:08,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:01:08,454 INFO L82 PathProgramCache]: Analyzing trace with hash 834305455, now seen corresponding path program 47 times [2021-05-06 12:01:08,454 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:01:08,454 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1433138496] [2021-05-06 12:01:08,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:01:08,459 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:08,472 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:08,474 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:08,482 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:08,484 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:08,491 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:08,505 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:08,508 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:01:08,508 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:08,512 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:08,520 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:01:08,527 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 12:01:08,528 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:08,530 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:01:08,535 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:08,539 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:08,543 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:01:08,550 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:08,553 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:08,554 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:08,555 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:08,563 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:08,564 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:08,583 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:08,597 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:08,598 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:08,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:09,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:01:09,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:09,537 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:01:09,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:09,539 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:13,023 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:01:13,023 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1433138496] [2021-05-06 12:01:13,023 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1433138496] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:01:13,023 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:01:13,023 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [135] imperfect sequences [] total 135 [2021-05-06 12:01:13,023 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678488658] [2021-05-06 12:01:13,024 INFO L460 AbstractCegarLoop]: Interpolant automaton has 135 states [2021-05-06 12:01:13,024 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:01:13,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 135 interpolants. [2021-05-06 12:01:13,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5510, Invalid=12580, Unknown=0, NotChecked=0, Total=18090 [2021-05-06 12:01:13,025 INFO L87 Difference]: Start difference. First operand 226 states and 229 transitions. Second operand has 135 states, 135 states have (on average 1.637037037037037) internal successors, (221), 134 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 12:01:27,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:01:27,748 INFO L93 Difference]: Finished difference Result 449 states and 460 transitions. [2021-05-06 12:01:27,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 135 states. [2021-05-06 12:01:27,748 INFO L78 Accepts]: Start accepts. Automaton has has 135 states, 135 states have (on average 1.637037037037037) internal successors, (221), 134 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 12:01:27,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:01:27,749 INFO L225 Difference]: With dead ends: 449 [2021-05-06 12:01:27,749 INFO L226 Difference]: Without dead ends: 231 [2021-05-06 12:01:27,752 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 90 SyntacticMatches, 1 SemanticMatches, 265 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20667 ImplicationChecksByTransitivity, 13434.5ms TimeCoverageRelationStatistics Valid=16524, Invalid=54498, Unknown=0, NotChecked=0, Total=71022 [2021-05-06 12:01:27,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2021-05-06 12:01:27,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 231. [2021-05-06 12:01:27,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 231 states, 226 states have (on average 1.0176991150442478) internal successors, (230), 226 states have internal predecessors, (230), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:27,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 234 transitions. [2021-05-06 12:01:27,763 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 234 transitions. Word has length 225 [2021-05-06 12:01:27,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:01:27,763 INFO L480 AbstractCegarLoop]: Abstraction has 231 states and 234 transitions. [2021-05-06 12:01:27,763 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 135 states, 135 states have (on average 1.637037037037037) internal successors, (221), 134 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 12:01:27,763 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 234 transitions. [2021-05-06 12:01:27,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2021-05-06 12:01:27,764 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:01:27,764 INFO L523 BasicCegarLoop]: trace histogram [85, 84, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:01:27,764 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable143 [2021-05-06 12:01:27,764 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:01:27,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:01:27,764 INFO L82 PathProgramCache]: Analyzing trace with hash -585453858, now seen corresponding path program 48 times [2021-05-06 12:01:27,765 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:01:27,765 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [614709475] [2021-05-06 12:01:27,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:01:27,770 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:27,783 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:27,784 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:27,792 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:27,793 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:27,802 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:27,817 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:27,820 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:01:27,826 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:27,833 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:27,837 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:01:27,845 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:27,846 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:27,850 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:01:27,856 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:27,860 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:27,864 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:01:27,871 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:27,874 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:27,875 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:27,876 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:27,884 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:27,886 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:27,904 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:27,919 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:27,920 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:27,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:28,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:01:28,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:28,887 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:01:28,887 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:28,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:32,471 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:01:32,471 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [614709475] [2021-05-06 12:01:32,471 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [614709475] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:01:32,471 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:01:32,471 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [138] imperfect sequences [] total 138 [2021-05-06 12:01:32,471 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944102477] [2021-05-06 12:01:32,471 INFO L460 AbstractCegarLoop]: Interpolant automaton has 138 states [2021-05-06 12:01:32,471 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:01:32,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 138 interpolants. [2021-05-06 12:01:32,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5748, Invalid=13158, Unknown=0, NotChecked=0, Total=18906 [2021-05-06 12:01:32,473 INFO L87 Difference]: Start difference. First operand 231 states and 234 transitions. Second operand has 138 states, 138 states have (on average 1.6376811594202898) internal successors, (226), 137 states have internal predecessors, (226), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:47,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:01:47,373 INFO L93 Difference]: Finished difference Result 459 states and 470 transitions. [2021-05-06 12:01:47,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 138 states. [2021-05-06 12:01:47,374 INFO L78 Accepts]: Start accepts. Automaton has has 138 states, 138 states have (on average 1.6376811594202898) internal successors, (226), 137 states have internal predecessors, (226), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 230 [2021-05-06 12:01:47,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:01:47,375 INFO L225 Difference]: With dead ends: 459 [2021-05-06 12:01:47,375 INFO L226 Difference]: Without dead ends: 236 [2021-05-06 12:01:47,379 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 271 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21610 ImplicationChecksByTransitivity, 13614.9ms TimeCoverageRelationStatistics Valid=17238, Invalid=57018, Unknown=0, NotChecked=0, Total=74256 [2021-05-06 12:01:47,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2021-05-06 12:01:47,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 236. [2021-05-06 12:01:47,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 236 states, 231 states have (on average 1.0173160173160174) internal successors, (235), 231 states have internal predecessors, (235), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:47,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 239 transitions. [2021-05-06 12:01:47,390 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 239 transitions. Word has length 230 [2021-05-06 12:01:47,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:01:47,391 INFO L480 AbstractCegarLoop]: Abstraction has 236 states and 239 transitions. [2021-05-06 12:01:47,391 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 138 states, 138 states have (on average 1.6376811594202898) internal successors, (226), 137 states have internal predecessors, (226), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:47,391 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 239 transitions. [2021-05-06 12:01:47,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 236 [2021-05-06 12:01:47,392 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:01:47,392 INFO L523 BasicCegarLoop]: trace histogram [87, 86, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:01:47,392 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable146 [2021-05-06 12:01:47,392 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:01:47,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:01:47,393 INFO L82 PathProgramCache]: Analyzing trace with hash -1061110981, now seen corresponding path program 49 times [2021-05-06 12:01:47,393 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:01:47,393 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [56037662] [2021-05-06 12:01:47,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:01:47,399 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:47,399 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:47,400 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:47,407 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:47,408 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:47,432 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:47,445 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:47,448 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:01:47,448 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:47,451 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:47,459 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:01:47,465 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:47,466 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:47,467 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:01:47,467 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:47,471 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:47,479 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:01:47,485 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:47,488 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:47,489 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:47,490 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:47,498 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:47,499 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:47,518 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:47,531 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:47,532 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:47,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:48,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:01:48,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:48,567 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:01:48,569 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:48,570 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:52,314 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:01:52,314 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [56037662] [2021-05-06 12:01:52,314 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [56037662] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:01:52,314 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:01:52,314 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [141] imperfect sequences [] total 141 [2021-05-06 12:01:52,315 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367134248] [2021-05-06 12:01:52,315 INFO L460 AbstractCegarLoop]: Interpolant automaton has 141 states [2021-05-06 12:01:52,315 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:01:52,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 141 interpolants. [2021-05-06 12:01:52,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5991, Invalid=13749, Unknown=0, NotChecked=0, Total=19740 [2021-05-06 12:01:52,316 INFO L87 Difference]: Start difference. First operand 236 states and 239 transitions. Second operand has 141 states, 141 states have (on average 1.6382978723404256) internal successors, (231), 140 states have internal predecessors, (231), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:07,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:02:07,935 INFO L93 Difference]: Finished difference Result 469 states and 480 transitions. [2021-05-06 12:02:07,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 141 states. [2021-05-06 12:02:07,935 INFO L78 Accepts]: Start accepts. Automaton has has 141 states, 141 states have (on average 1.6382978723404256) internal successors, (231), 140 states have internal predecessors, (231), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 235 [2021-05-06 12:02:07,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:02:07,936 INFO L225 Difference]: With dead ends: 469 [2021-05-06 12:02:07,936 INFO L226 Difference]: Without dead ends: 241 [2021-05-06 12:02:07,939 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 277 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22574 ImplicationChecksByTransitivity, 14313.4ms TimeCoverageRelationStatistics Valid=17967, Invalid=59595, Unknown=0, NotChecked=0, Total=77562 [2021-05-06 12:02:07,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2021-05-06 12:02:07,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 241. [2021-05-06 12:02:07,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 236 states have (on average 1.0169491525423728) internal successors, (240), 236 states have internal predecessors, (240), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:07,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 244 transitions. [2021-05-06 12:02:07,950 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 244 transitions. Word has length 235 [2021-05-06 12:02:07,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:02:07,950 INFO L480 AbstractCegarLoop]: Abstraction has 241 states and 244 transitions. [2021-05-06 12:02:07,950 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 141 states, 141 states have (on average 1.6382978723404256) internal successors, (231), 140 states have internal predecessors, (231), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:07,950 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 244 transitions. [2021-05-06 12:02:07,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2021-05-06 12:02:07,951 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:02:07,951 INFO L523 BasicCegarLoop]: trace histogram [89, 88, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:02:07,951 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable149 [2021-05-06 12:02:07,951 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:02:07,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:02:07,951 INFO L82 PathProgramCache]: Analyzing trace with hash 1943277138, now seen corresponding path program 50 times [2021-05-06 12:02:07,952 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:02:07,952 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1439502625] [2021-05-06 12:02:07,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:02:07,957 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:07,958 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:07,959 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:07,966 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:07,968 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:07,986 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:07,999 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:08,002 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:02:08,002 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:08,006 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:08,015 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:02:08,022 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:08,022 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:08,024 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:02:08,029 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:08,032 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:08,036 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:02:08,043 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:08,046 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:08,059 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:08,065 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:08,073 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:08,075 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:08,083 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:08,097 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 12:02:08,098 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:08,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:09,237 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:02:09,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:09,249 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:02:09,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:13,118 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:02:13,119 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1439502625] [2021-05-06 12:02:13,119 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1439502625] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:02:13,119 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:02:13,119 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [144] imperfect sequences [] total 144 [2021-05-06 12:02:13,119 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006648035] [2021-05-06 12:02:13,119 INFO L460 AbstractCegarLoop]: Interpolant automaton has 144 states [2021-05-06 12:02:13,119 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:02:13,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 144 interpolants. [2021-05-06 12:02:13,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6444, Invalid=15018, Unknown=0, NotChecked=0, Total=21462 [2021-05-06 12:02:13,121 INFO L87 Difference]: Start difference. First operand 241 states and 244 transitions. Second operand has 144 states, 144 states have (on average 1.6388888888888888) internal successors, (236), 143 states have internal predecessors, (236), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:29,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:02:29,508 INFO L93 Difference]: Finished difference Result 653 states and 664 transitions. [2021-05-06 12:02:29,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2021-05-06 12:02:29,508 INFO L78 Accepts]: Start accepts. Automaton has has 144 states, 144 states have (on average 1.6388888888888888) internal successors, (236), 143 states have internal predecessors, (236), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 240 [2021-05-06 12:02:29,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:02:29,510 INFO L225 Difference]: With dead ends: 653 [2021-05-06 12:02:29,510 INFO L226 Difference]: Without dead ends: 420 [2021-05-06 12:02:29,513 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 95 SyntacticMatches, 1 SemanticMatches, 286 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24482 ImplicationChecksByTransitivity, 14887.5ms TimeCoverageRelationStatistics Valid=18921, Invalid=63735, Unknown=0, NotChecked=0, Total=82656 [2021-05-06 12:02:29,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 420 states. [2021-05-06 12:02:29,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 420 to 420. [2021-05-06 12:02:29,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 420 states, 415 states have (on average 1.0120481927710843) internal successors, (420), 415 states have internal predecessors, (420), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:29,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 420 states to 420 states and 424 transitions. [2021-05-06 12:02:29,545 INFO L78 Accepts]: Start accepts. Automaton has 420 states and 424 transitions. Word has length 240 [2021-05-06 12:02:29,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:02:29,546 INFO L480 AbstractCegarLoop]: Abstraction has 420 states and 424 transitions. [2021-05-06 12:02:29,546 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 144 states, 144 states have (on average 1.6388888888888888) internal successors, (236), 143 states have internal predecessors, (236), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:29,546 INFO L276 IsEmpty]: Start isEmpty. Operand 420 states and 424 transitions. [2021-05-06 12:02:29,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2021-05-06 12:02:29,547 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:02:29,547 INFO L523 BasicCegarLoop]: trace histogram [90, 89, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:02:29,547 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable152 [2021-05-06 12:02:29,547 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:02:29,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:02:29,547 INFO L82 PathProgramCache]: Analyzing trace with hash 98808940, now seen corresponding path program 51 times [2021-05-06 12:02:29,547 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:02:29,547 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [748326102] [2021-05-06 12:02:29,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:02:29,553 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:29,554 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:29,555 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:29,562 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:29,564 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:29,582 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:29,596 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:29,598 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:02:29,599 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:29,602 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:29,612 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:02:29,620 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:29,621 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:29,622 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:02:29,623 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:29,627 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:29,637 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:02:29,644 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:29,647 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:29,661 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:29,663 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:29,670 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:29,672 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:29,680 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:29,694 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:29,694 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:29,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:30,757 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:02:30,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:30,765 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:02:30,765 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:30,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:34,749 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:02:34,749 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [748326102] [2021-05-06 12:02:34,750 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [748326102] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:02:34,750 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:02:34,750 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [146] imperfect sequences [] total 146 [2021-05-06 12:02:34,750 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41694759] [2021-05-06 12:02:34,750 INFO L460 AbstractCegarLoop]: Interpolant automaton has 146 states [2021-05-06 12:02:34,750 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:02:34,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2021-05-06 12:02:34,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6437, Invalid=14733, Unknown=0, NotChecked=0, Total=21170 [2021-05-06 12:02:34,751 INFO L87 Difference]: Start difference. First operand 420 states and 424 transitions. Second operand has 146 states, 146 states have (on average 1.6369863013698631) internal successors, (239), 145 states have internal predecessors, (239), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:51,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:02:51,266 INFO L93 Difference]: Finished difference Result 661 states and 675 transitions. [2021-05-06 12:02:51,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 146 states. [2021-05-06 12:02:51,267 INFO L78 Accepts]: Start accepts. Automaton has has 146 states, 146 states have (on average 1.6369863013698631) internal successors, (239), 145 states have internal predecessors, (239), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 243 [2021-05-06 12:02:51,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:02:51,268 INFO L225 Difference]: With dead ends: 661 [2021-05-06 12:02:51,268 INFO L226 Difference]: Without dead ends: 427 [2021-05-06 12:02:51,271 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 385 GetRequests, 97 SyntacticMatches, 1 SemanticMatches, 287 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24268 ImplicationChecksByTransitivity, 15075.2ms TimeCoverageRelationStatistics Valid=19305, Invalid=63927, Unknown=0, NotChecked=0, Total=83232 [2021-05-06 12:02:51,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 427 states. [2021-05-06 12:02:51,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 427 to 249. [2021-05-06 12:02:51,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 244 states have (on average 1.0163934426229508) internal successors, (248), 244 states have internal predecessors, (248), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:51,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 252 transitions. [2021-05-06 12:02:51,282 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 252 transitions. Word has length 243 [2021-05-06 12:02:51,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:02:51,283 INFO L480 AbstractCegarLoop]: Abstraction has 249 states and 252 transitions. [2021-05-06 12:02:51,283 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 146 states, 146 states have (on average 1.6369863013698631) internal successors, (239), 145 states have internal predecessors, (239), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:51,283 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 252 transitions. [2021-05-06 12:02:51,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 249 [2021-05-06 12:02:51,284 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:02:51,284 INFO L523 BasicCegarLoop]: trace histogram [92, 91, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:02:51,284 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable155 [2021-05-06 12:02:51,284 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:02:51,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:02:51,284 INFO L82 PathProgramCache]: Analyzing trace with hash 118608193, now seen corresponding path program 52 times [2021-05-06 12:02:51,284 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:02:51,284 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1262102623] [2021-05-06 12:02:51,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:02:51,290 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:51,303 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:51,304 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:51,312 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:51,314 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:51,322 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:51,335 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:51,349 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:02:51,350 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:51,353 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:51,362 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:02:51,370 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 12:02:51,370 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:51,372 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:02:51,377 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:51,381 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:51,385 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:02:51,392 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:51,395 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:51,408 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:51,409 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:51,417 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:51,429 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:51,437 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:51,451 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:51,451 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:51,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:52,548 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:02:52,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:52,550 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 12:02:52,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:52,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:56,605 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:02:56,605 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1262102623] [2021-05-06 12:02:56,605 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1262102623] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:02:56,605 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:02:56,605 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [149] imperfect sequences [] total 149 [2021-05-06 12:02:56,606 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794890362] [2021-05-06 12:02:56,606 INFO L460 AbstractCegarLoop]: Interpolant automaton has 149 states [2021-05-06 12:02:56,606 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:02:56,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 149 interpolants. [2021-05-06 12:02:56,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6694, Invalid=15358, Unknown=0, NotChecked=0, Total=22052 [2021-05-06 12:02:56,607 INFO L87 Difference]: Start difference. First operand 249 states and 252 transitions. Second operand has 149 states, 149 states have (on average 1.6375838926174497) internal successors, (244), 148 states have internal predecessors, (244), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:13,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:13,874 INFO L93 Difference]: Finished difference Result 495 states and 506 transitions. [2021-05-06 12:03:13,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 149 states. [2021-05-06 12:03:13,874 INFO L78 Accepts]: Start accepts. Automaton has has 149 states, 149 states have (on average 1.6375838926174497) internal successors, (244), 148 states have internal predecessors, (244), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 248 [2021-05-06 12:03:13,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:13,875 INFO L225 Difference]: With dead ends: 495 [2021-05-06 12:03:13,875 INFO L226 Difference]: Without dead ends: 254 [2021-05-06 12:03:13,878 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 393 GetRequests, 99 SyntacticMatches, 1 SemanticMatches, 293 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25289 ImplicationChecksByTransitivity, 15597.1ms TimeCoverageRelationStatistics Valid=20076, Invalid=66654, Unknown=0, NotChecked=0, Total=86730 [2021-05-06 12:03:13,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2021-05-06 12:03:13,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 254. [2021-05-06 12:03:13,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 254 states, 249 states have (on average 1.0160642570281124) internal successors, (253), 249 states have internal predecessors, (253), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:13,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 257 transitions. [2021-05-06 12:03:13,889 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 257 transitions. Word has length 248 [2021-05-06 12:03:13,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:13,889 INFO L480 AbstractCegarLoop]: Abstraction has 254 states and 257 transitions. [2021-05-06 12:03:13,889 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 149 states, 149 states have (on average 1.6375838926174497) internal successors, (244), 148 states have internal predecessors, (244), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:13,889 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 257 transitions. [2021-05-06 12:03:13,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 254 [2021-05-06 12:03:13,890 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:13,890 INFO L523 BasicCegarLoop]: trace histogram [94, 93, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:13,890 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable158 [2021-05-06 12:03:13,890 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:13,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:13,891 INFO L82 PathProgramCache]: Analyzing trace with hash 199840696, now seen corresponding path program 53 times [2021-05-06 12:03:13,891 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:13,891 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1629792523] [2021-05-06 12:03:13,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:13,903 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:03:13,917 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:13,918 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:13,925 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:13,927 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:13,935 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:03:13,949 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 12:03:13,951 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:03:13,951 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:13,955 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:13,963 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:03:13,970 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:13,971 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:13,972 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:03:13,978 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:13,981 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:13,985 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:03:13,992 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 12:03:13,995 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:03:14,008 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:14,009 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:14,016 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:14,018 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:14,026 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:03:14,040 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:14,042 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:14,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:15,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:15,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:15,205 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:15,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:15,207 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:19,505 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:19,505 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1629792523] [2021-05-06 12:03:19,506 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1629792523] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:19,506 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:19,506 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [152] imperfect sequences [] total 152 [2021-05-06 12:03:19,506 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158977791] [2021-05-06 12:03:19,506 INFO L460 AbstractCegarLoop]: Interpolant automaton has 152 states [2021-05-06 12:03:19,506 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:19,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2021-05-06 12:03:19,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6956, Invalid=15996, Unknown=0, NotChecked=0, Total=22952 [2021-05-06 12:03:19,508 INFO L87 Difference]: Start difference. First operand 254 states and 257 transitions. Second operand has 152 states, 152 states have (on average 1.638157894736842) internal successors, (249), 151 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 12:03:37,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:37,562 INFO L93 Difference]: Finished difference Result 505 states and 516 transitions. [2021-05-06 12:03:37,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 152 states. [2021-05-06 12:03:37,563 INFO L78 Accepts]: Start accepts. Automaton has has 152 states, 152 states have (on average 1.638157894736842) internal successors, (249), 151 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 12:03:37,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:37,564 INFO L225 Difference]: With dead ends: 505 [2021-05-06 12:03:37,564 INFO L226 Difference]: Without dead ends: 259 [2021-05-06 12:03:37,568 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 101 SyntacticMatches, 1 SemanticMatches, 299 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26331 ImplicationChecksByTransitivity, 16337.5ms TimeCoverageRelationStatistics Valid=20862, Invalid=69438, Unknown=0, NotChecked=0, Total=90300 [2021-05-06 12:03:37,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2021-05-06 12:03:37,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 259. [2021-05-06 12:03:37,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 254 states have (on average 1.015748031496063) internal successors, (258), 254 states have internal predecessors, (258), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:37,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 262 transitions. [2021-05-06 12:03:37,588 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 262 transitions. Word has length 253 [2021-05-06 12:03:37,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:37,588 INFO L480 AbstractCegarLoop]: Abstraction has 259 states and 262 transitions. [2021-05-06 12:03:37,588 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 152 states, 152 states have (on average 1.638157894736842) internal successors, (249), 151 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 12:03:37,588 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 262 transitions. [2021-05-06 12:03:37,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2021-05-06 12:03:37,590 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:37,590 INFO L523 BasicCegarLoop]: trace histogram [96, 95, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:37,590 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable161 [2021-05-06 12:03:37,590 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:37,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:37,590 INFO L82 PathProgramCache]: Analyzing trace with hash -1813764363, now seen corresponding path program 54 times [2021-05-06 12:03:37,590 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:37,590 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1372137067] [2021-05-06 12:03:37,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:37,598 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:03:37,615 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:37,617 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:37,627 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:37,629 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:37,640 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:03:37,657 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:37,660 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:03:37,661 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:37,666 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:37,677 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:03:37,686 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:37,687 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:37,689 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:03:37,695 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:37,699 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:37,703 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:03:37,710 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:37,713 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:03:37,726 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:37,727 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:37,735 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:37,737 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:37,749 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:03:37,763 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:37,764 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:37,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:39,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:39,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:39,067 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:39,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:39,069 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:43,508 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:43,508 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1372137067] [2021-05-06 12:03:43,509 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1372137067] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:43,509 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:43,509 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [155] imperfect sequences [] total 155 [2021-05-06 12:03:43,509 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110555928] [2021-05-06 12:03:43,509 INFO L460 AbstractCegarLoop]: Interpolant automaton has 155 states [2021-05-06 12:03:43,509 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:43,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2021-05-06 12:03:43,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7223, Invalid=16647, Unknown=0, NotChecked=0, Total=23870 [2021-05-06 12:03:43,511 INFO L87 Difference]: Start difference. First operand 259 states and 262 transitions. Second operand has 155 states, 155 states have (on average 1.6387096774193548) internal successors, (254), 154 states have internal predecessors, (254), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:02,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:02,142 INFO L93 Difference]: Finished difference Result 515 states and 526 transitions. [2021-05-06 12:04:02,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 155 states. [2021-05-06 12:04:02,143 INFO L78 Accepts]: Start accepts. Automaton has has 155 states, 155 states have (on average 1.6387096774193548) internal successors, (254), 154 states have internal predecessors, (254), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 258 [2021-05-06 12:04:02,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:02,143 INFO L225 Difference]: With dead ends: 515 [2021-05-06 12:04:02,143 INFO L226 Difference]: Without dead ends: 264 [2021-05-06 12:04:02,146 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 305 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27394 ImplicationChecksByTransitivity, 17023.8ms TimeCoverageRelationStatistics Valid=21663, Invalid=72279, Unknown=0, NotChecked=0, Total=93942 [2021-05-06 12:04:02,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2021-05-06 12:04:02,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 264. [2021-05-06 12:04:02,158 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 12:04:02,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 267 transitions. [2021-05-06 12:04:02,158 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 267 transitions. Word has length 258 [2021-05-06 12:04:02,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:02,158 INFO L480 AbstractCegarLoop]: Abstraction has 264 states and 267 transitions. [2021-05-06 12:04:02,159 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 155 states, 155 states have (on average 1.6387096774193548) internal successors, (254), 154 states have internal predecessors, (254), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:02,159 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 267 transitions. [2021-05-06 12:04:02,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 264 [2021-05-06 12:04:02,159 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:02,160 INFO L523 BasicCegarLoop]: trace histogram [98, 97, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:02,160 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable164 [2021-05-06 12:04:02,160 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:02,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:02,160 INFO L82 PathProgramCache]: Analyzing trace with hash -1653024508, now seen corresponding path program 55 times [2021-05-06 12:04:02,160 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:02,160 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1410939886] [2021-05-06 12:04:02,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:02,166 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:04:02,166 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,167 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,174 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:02,175 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:02,193 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:04:02,205 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:02,207 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:04:02,212 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,216 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:02,219 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:04:02,226 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:02,227 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:02,229 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:04:02,229 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,232 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:02,241 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:04:02,248 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:02,251 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:04:02,264 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,265 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:02,271 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:02,273 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:02,281 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:04:02,295 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:02,296 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:02,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:03,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:03,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:03,546 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:03,547 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:03,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:08,188 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:08,188 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1410939886] [2021-05-06 12:04:08,188 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1410939886] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:08,188 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:08,188 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [158] imperfect sequences [] total 158 [2021-05-06 12:04:08,188 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1998438626] [2021-05-06 12:04:08,188 INFO L460 AbstractCegarLoop]: Interpolant automaton has 158 states [2021-05-06 12:04:08,188 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:08,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2021-05-06 12:04:08,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7495, Invalid=17311, Unknown=0, NotChecked=0, Total=24806 [2021-05-06 12:04:08,190 INFO L87 Difference]: Start difference. First operand 264 states and 267 transitions. Second operand has 158 states, 158 states have (on average 1.639240506329114) internal successors, (259), 157 states have internal predecessors, (259), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:28,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:28,110 INFO L93 Difference]: Finished difference Result 525 states and 536 transitions. [2021-05-06 12:04:28,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 158 states. [2021-05-06 12:04:28,110 INFO L78 Accepts]: Start accepts. Automaton has has 158 states, 158 states have (on average 1.639240506329114) internal successors, (259), 157 states have internal predecessors, (259), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 263 [2021-05-06 12:04:28,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:28,111 INFO L225 Difference]: With dead ends: 525 [2021-05-06 12:04:28,111 INFO L226 Difference]: Without dead ends: 269 [2021-05-06 12:04:28,114 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 105 SyntacticMatches, 1 SemanticMatches, 311 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28478 ImplicationChecksByTransitivity, 18145.6ms TimeCoverageRelationStatistics Valid=22479, Invalid=75177, Unknown=0, NotChecked=0, Total=97656 [2021-05-06 12:04:28,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2021-05-06 12:04:28,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 269. [2021-05-06 12:04:28,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 269 states, 264 states have (on average 1.0151515151515151) internal successors, (268), 264 states have internal predecessors, (268), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:28,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 272 transitions. [2021-05-06 12:04:28,126 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 272 transitions. Word has length 263 [2021-05-06 12:04:28,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:28,126 INFO L480 AbstractCegarLoop]: Abstraction has 269 states and 272 transitions. [2021-05-06 12:04:28,126 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 158 states, 158 states have (on average 1.639240506329114) internal successors, (259), 157 states have internal predecessors, (259), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:28,126 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 272 transitions. [2021-05-06 12:04:28,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2021-05-06 12:04:28,127 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:28,127 INFO L523 BasicCegarLoop]: trace histogram [100, 99, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:28,127 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable167 [2021-05-06 12:04:28,127 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:28,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:28,128 INFO L82 PathProgramCache]: Analyzing trace with hash -277809495, now seen corresponding path program 56 times [2021-05-06 12:04:28,128 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:28,128 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [901917069] [2021-05-06 12:04:28,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:28,137 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:04:28,163 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:28,164 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:28,173 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:28,175 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:28,183 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:04:28,196 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 12:04:28,198 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:04:28,198 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:28,202 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:28,210 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:04:28,217 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:28,218 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:28,221 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:04:28,222 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:28,226 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:28,236 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:04:28,243 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:28,247 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:04:28,262 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:28,263 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:28,270 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:28,272 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:28,280 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:04:28,293 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 12:04:28,294 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:28,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:29,608 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:29,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:29,610 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:29,611 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:29,612 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:34,378 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:34,378 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [901917069] [2021-05-06 12:04:34,379 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [901917069] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:34,379 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:34,379 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [161] imperfect sequences [] total 161 [2021-05-06 12:04:34,379 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514715814] [2021-05-06 12:04:34,379 INFO L460 AbstractCegarLoop]: Interpolant automaton has 161 states [2021-05-06 12:04:34,379 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:34,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 161 interpolants. [2021-05-06 12:04:34,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7772, Invalid=17988, Unknown=0, NotChecked=0, Total=25760 [2021-05-06 12:04:34,381 INFO L87 Difference]: Start difference. First operand 269 states and 272 transitions. Second operand has 161 states, 161 states have (on average 1.639751552795031) internal successors, (264), 160 states have internal predecessors, (264), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:54,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:54,329 INFO L93 Difference]: Finished difference Result 535 states and 546 transitions. [2021-05-06 12:04:54,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 161 states. [2021-05-06 12:04:54,330 INFO L78 Accepts]: Start accepts. Automaton has has 161 states, 161 states have (on average 1.639751552795031) internal successors, (264), 160 states have internal predecessors, (264), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 268 [2021-05-06 12:04:54,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:54,330 INFO L225 Difference]: With dead ends: 535 [2021-05-06 12:04:54,330 INFO L226 Difference]: Without dead ends: 274 [2021-05-06 12:04:54,333 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 425 GetRequests, 107 SyntacticMatches, 1 SemanticMatches, 317 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29583 ImplicationChecksByTransitivity, 18057.6ms TimeCoverageRelationStatistics Valid=23310, Invalid=78132, Unknown=0, NotChecked=0, Total=101442 [2021-05-06 12:04:54,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2021-05-06 12:04:54,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 274. [2021-05-06 12:04:54,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 274 states, 269 states have (on average 1.0148698884758365) internal successors, (273), 269 states have internal predecessors, (273), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:54,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 277 transitions. [2021-05-06 12:04:54,346 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 277 transitions. Word has length 268 [2021-05-06 12:04:54,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:54,346 INFO L480 AbstractCegarLoop]: Abstraction has 274 states and 277 transitions. [2021-05-06 12:04:54,346 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 161 states, 161 states have (on average 1.639751552795031) internal successors, (264), 160 states have internal predecessors, (264), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:54,346 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 277 transitions. [2021-05-06 12:04:54,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 274 [2021-05-06 12:04:54,347 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:54,347 INFO L523 BasicCegarLoop]: trace histogram [102, 101, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:54,347 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable170 [2021-05-06 12:04:54,347 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:54,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:54,347 INFO L82 PathProgramCache]: Analyzing trace with hash -497449904, now seen corresponding path program 57 times [2021-05-06 12:04:54,347 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:54,347 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1635893223] [2021-05-06 12:04:54,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:54,355 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:04:54,356 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:54,357 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:54,364 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:54,366 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:54,385 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:04:54,399 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 12:04:54,401 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:04:54,408 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:54,412 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:54,416 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:04:54,423 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 12:04:54,424 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:54,426 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:04:54,426 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:54,430 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:54,440 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:04:54,447 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:54,450 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:04:54,464 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:54,473 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:54,482 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:54,485 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:54,493 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:04:54,507 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:54,508 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:54,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:55,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:55,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:55,856 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:55,857 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:55,858 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:00,914 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:00,914 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1635893223] [2021-05-06 12:05:00,915 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1635893223] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:00,915 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:00,915 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [164] imperfect sequences [] total 164 [2021-05-06 12:05:00,915 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766169191] [2021-05-06 12:05:00,915 INFO L460 AbstractCegarLoop]: Interpolant automaton has 164 states [2021-05-06 12:05:00,915 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:00,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 164 interpolants. [2021-05-06 12:05:00,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8054, Invalid=18678, Unknown=0, NotChecked=0, Total=26732 [2021-05-06 12:05:00,917 INFO L87 Difference]: Start difference. First operand 274 states and 277 transitions. Second operand has 164 states, 164 states have (on average 1.6402439024390243) internal successors, (269), 163 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 12:05:22,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:22,879 INFO L93 Difference]: Finished difference Result 545 states and 556 transitions. [2021-05-06 12:05:22,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 164 states. [2021-05-06 12:05:22,880 INFO L78 Accepts]: Start accepts. Automaton has has 164 states, 164 states have (on average 1.6402439024390243) internal successors, (269), 163 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 12:05:22,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:22,881 INFO L225 Difference]: With dead ends: 545 [2021-05-06 12:05:22,881 INFO L226 Difference]: Without dead ends: 279 [2021-05-06 12:05:22,884 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 109 SyntacticMatches, 1 SemanticMatches, 323 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30709 ImplicationChecksByTransitivity, 19493.5ms TimeCoverageRelationStatistics Valid=24156, Invalid=81144, Unknown=0, NotChecked=0, Total=105300 [2021-05-06 12:05:22,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2021-05-06 12:05:22,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 279. [2021-05-06 12:05:22,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 274 states have (on average 1.0145985401459854) internal successors, (278), 274 states have internal predecessors, (278), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:22,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 282 transitions. [2021-05-06 12:05:22,897 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 282 transitions. Word has length 273 [2021-05-06 12:05:22,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:22,897 INFO L480 AbstractCegarLoop]: Abstraction has 279 states and 282 transitions. [2021-05-06 12:05:22,897 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 164 states, 164 states have (on average 1.6402439024390243) internal successors, (269), 163 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 12:05:22,898 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 282 transitions. [2021-05-06 12:05:22,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 279 [2021-05-06 12:05:22,898 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:22,899 INFO L523 BasicCegarLoop]: trace histogram [104, 103, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:22,899 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable173 [2021-05-06 12:05:22,899 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:22,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:22,899 INFO L82 PathProgramCache]: Analyzing trace with hash 2110849117, now seen corresponding path program 58 times [2021-05-06 12:05:22,899 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:22,899 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [736352150] [2021-05-06 12:05:22,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:22,905 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:05:22,918 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:22,919 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:22,925 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:22,927 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:22,935 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:05:22,948 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:22,950 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:05:22,955 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:22,959 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:22,963 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:05:22,970 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:22,971 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:22,973 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:05:22,978 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:22,982 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:22,986 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:05:22,993 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 12:05:22,996 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:05:23,009 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:23,010 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:23,017 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:23,019 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:23,028 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:05:23,043 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 12:05:23,044 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:23,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:24,431 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:24,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:24,434 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:24,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:24,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:29,870 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:29,870 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [736352150] [2021-05-06 12:05:29,871 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [736352150] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:29,871 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:29,871 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [167] imperfect sequences [] total 167 [2021-05-06 12:05:29,871 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290449898] [2021-05-06 12:05:29,871 INFO L460 AbstractCegarLoop]: Interpolant automaton has 167 states [2021-05-06 12:05:29,871 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:29,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 167 interpolants. [2021-05-06 12:05:29,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8341, Invalid=19381, Unknown=0, NotChecked=0, Total=27722 [2021-05-06 12:05:29,873 INFO L87 Difference]: Start difference. First operand 279 states and 282 transitions. Second operand has 167 states, 167 states have (on average 1.6407185628742516) internal successors, (274), 166 states have internal predecessors, (274), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:52,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:52,027 INFO L93 Difference]: Finished difference Result 555 states and 566 transitions. [2021-05-06 12:05:52,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 167 states. [2021-05-06 12:05:52,028 INFO L78 Accepts]: Start accepts. Automaton has has 167 states, 167 states have (on average 1.6407185628742516) internal successors, (274), 166 states have internal predecessors, (274), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 278 [2021-05-06 12:05:52,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:52,029 INFO L225 Difference]: With dead ends: 555 [2021-05-06 12:05:52,029 INFO L226 Difference]: Without dead ends: 284 [2021-05-06 12:05:52,032 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 441 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 329 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31798 ImplicationChecksByTransitivity, 20185.9ms TimeCoverageRelationStatistics Valid=25017, Invalid=84213, Unknown=0, NotChecked=0, Total=109230 [2021-05-06 12:05:52,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2021-05-06 12:05:52,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 284. [2021-05-06 12:05:52,045 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 12:05:52,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 287 transitions. [2021-05-06 12:05:52,045 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 287 transitions. Word has length 278 [2021-05-06 12:05:52,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:52,045 INFO L480 AbstractCegarLoop]: Abstraction has 284 states and 287 transitions. [2021-05-06 12:05:52,045 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 167 states, 167 states have (on average 1.6407185628742516) internal successors, (274), 166 states have internal predecessors, (274), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:52,046 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 287 transitions. [2021-05-06 12:05:52,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 284 [2021-05-06 12:05:52,046 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:52,047 INFO L523 BasicCegarLoop]: trace histogram [106, 105, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:52,047 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable176 [2021-05-06 12:05:52,047 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:52,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:52,047 INFO L82 PathProgramCache]: Analyzing trace with hash -2121099876, now seen corresponding path program 59 times [2021-05-06 12:05:52,047 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:52,047 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1950375665] [2021-05-06 12:05:52,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:52,053 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:05:52,066 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:52,067 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:52,073 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:52,075 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:52,082 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:05:52,095 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:52,097 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:05:52,098 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:52,101 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:52,110 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:05:52,117 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:52,118 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:52,119 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:05:52,119 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:52,123 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:52,132 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:05:52,139 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 12:05:52,142 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:05:52,155 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:52,156 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:52,164 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:52,166 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:52,174 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:05:52,188 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:52,189 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:52,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:53,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:53,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:53,657 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:53,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:53,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:59,261 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:59,261 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1950375665] [2021-05-06 12:05:59,261 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1950375665] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:59,261 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:59,261 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [170] imperfect sequences [] total 170 [2021-05-06 12:05:59,261 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380649938] [2021-05-06 12:05:59,262 INFO L460 AbstractCegarLoop]: Interpolant automaton has 170 states [2021-05-06 12:05:59,262 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:59,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 170 interpolants. [2021-05-06 12:05:59,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8633, Invalid=20097, Unknown=0, NotChecked=0, Total=28730 [2021-05-06 12:05:59,264 INFO L87 Difference]: Start difference. First operand 284 states and 287 transitions. Second operand has 170 states, 170 states have (on average 1.6411764705882352) internal successors, (279), 169 states have internal predecessors, (279), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:21,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:21,679 INFO L93 Difference]: Finished difference Result 565 states and 576 transitions. [2021-05-06 12:06:21,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 170 states. [2021-05-06 12:06:21,679 INFO L78 Accepts]: Start accepts. Automaton has has 170 states, 170 states have (on average 1.6411764705882352) internal successors, (279), 169 states have internal predecessors, (279), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 283 [2021-05-06 12:06:21,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:21,680 INFO L225 Difference]: With dead ends: 565 [2021-05-06 12:06:21,680 INFO L226 Difference]: Without dead ends: 289 [2021-05-06 12:06:21,684 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 449 GetRequests, 113 SyntacticMatches, 1 SemanticMatches, 335 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33024 ImplicationChecksByTransitivity, 20568.1ms TimeCoverageRelationStatistics Valid=25893, Invalid=87339, Unknown=0, NotChecked=0, Total=113232 [2021-05-06 12:06:21,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-05-06 12:06:21,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2021-05-06 12:06:21,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 284 states have (on average 1.0140845070422535) internal successors, (288), 284 states have internal predecessors, (288), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:21,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 292 transitions. [2021-05-06 12:06:21,698 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 292 transitions. Word has length 283 [2021-05-06 12:06:21,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:21,698 INFO L480 AbstractCegarLoop]: Abstraction has 289 states and 292 transitions. [2021-05-06 12:06:21,698 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 170 states, 170 states have (on average 1.6411764705882352) internal successors, (279), 169 states have internal predecessors, (279), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:21,698 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 292 transitions. [2021-05-06 12:06:21,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 289 [2021-05-06 12:06:21,699 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:21,699 INFO L523 BasicCegarLoop]: trace histogram [108, 107, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:21,699 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable179 [2021-05-06 12:06:21,699 INFO L428 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:21,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:21,700 INFO L82 PathProgramCache]: Analyzing trace with hash -1243806703, now seen corresponding path program 60 times [2021-05-06 12:06:21,700 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:21,700 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [340573564] [2021-05-06 12:06:21,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:21,707 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:06:21,721 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:21,722 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:21,728 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:21,730 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:21,738 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:06:21,754 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:21,757 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:06:21,763 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:21,768 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:21,772 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:06:21,781 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:21,782 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:21,784 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:06:21,791 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:21,795 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:21,800 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:06:21,808 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:21,812 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:06:21,812 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:21,813 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:21,823 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:21,825 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:21,846 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:06:21,861 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:21,862 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:21,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:23,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:23,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:23,453 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 12:06:23,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:29,083 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:29,083 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [340573564] [2021-05-06 12:06:29,083 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [340573564] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:29,083 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:29,084 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [173] imperfect sequences [] total 173 [2021-05-06 12:06:29,084 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759416346] [2021-05-06 12:06:29,084 INFO L460 AbstractCegarLoop]: Interpolant automaton has 173 states [2021-05-06 12:06:29,084 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:29,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 173 interpolants. [2021-05-06 12:06:29,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9174, Invalid=21626, Unknown=0, NotChecked=0, Total=30800 [2021-05-06 12:06:29,086 INFO L87 Difference]: Start difference. First operand 289 states and 292 transitions. Second operand has 173 states, 173 states have (on average 1.6416184971098267) internal successors, (284), 172 states have internal predecessors, (284), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:52,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:52,425 INFO L93 Difference]: Finished difference Result 787 states and 798 transitions. [2021-05-06 12:06:52,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 173 states. [2021-05-06 12:06:52,425 INFO L78 Accepts]: Start accepts. Automaton has has 173 states, 173 states have (on average 1.6416184971098267) internal successors, (284), 172 states have internal predecessors, (284), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 288 [2021-05-06 12:06:52,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:52,426 INFO L225 Difference]: With dead ends: 787 [2021-05-06 12:06:52,426 INFO L226 Difference]: Without dead ends: 506 [2021-05-06 12:06:52,430 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 459 GetRequests, 114 SyntacticMatches, 1 SemanticMatches, 344 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35328 ImplicationChecksByTransitivity, 21178.8ms TimeCoverageRelationStatistics Valid=27033, Invalid=92337, Unknown=0, NotChecked=0, Total=119370 [2021-05-06 12:06:52,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 506 states. [2021-05-06 12:06:52,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 506 to 506. [2021-05-06 12:06:52,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 506 states, 501 states have (on average 1.0099800399201597) internal successors, (506), 501 states have internal predecessors, (506), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:52,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 506 states to 506 states and 510 transitions. [2021-05-06 12:06:52,457 INFO L78 Accepts]: Start accepts. Automaton has 506 states and 510 transitions. Word has length 288 [2021-05-06 12:06:52,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:52,457 INFO L480 AbstractCegarLoop]: Abstraction has 506 states and 510 transitions. [2021-05-06 12:06:52,458 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 173 states, 173 states have (on average 1.6416184971098267) internal successors, (284), 172 states have internal predecessors, (284), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:52,458 INFO L276 IsEmpty]: Start isEmpty. Operand 506 states and 510 transitions. [2021-05-06 12:06:52,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 292 [2021-05-06 12:06:52,459 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:52,459 INFO L523 BasicCegarLoop]: trace histogram [109, 108, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:52,459 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable182 [2021-05-06 12:06:52,459 INFO L428 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:52,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:52,459 INFO L82 PathProgramCache]: Analyzing trace with hash 408859789, now seen corresponding path program 61 times [2021-05-06 12:06:52,459 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:52,459 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1838999624] [2021-05-06 12:06:52,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:52,475 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:06:52,476 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:52,477 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:52,484 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:52,486 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:52,504 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:06:52,518 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 12:06:52,520 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:06:52,521 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:52,526 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:52,536 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:06:52,543 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:52,543 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:52,546 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:06:52,547 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:52,550 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:52,559 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:06:52,566 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:52,569 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:06:52,569 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:52,570 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:52,578 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:52,580 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:52,600 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:06:52,614 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:52,615 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:52,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:54,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:54,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:54,078 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:54,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:54,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:59,690 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:59,690 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1838999624] [2021-05-06 12:06:59,690 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1838999624] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:59,690 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:59,690 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [175] imperfect sequences [] total 175 [2021-05-06 12:06:59,690 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167185214] [2021-05-06 12:06:59,691 INFO L460 AbstractCegarLoop]: Interpolant automaton has 175 states [2021-05-06 12:06:59,691 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:59,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 175 interpolants. [2021-05-06 12:06:59,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9167, Invalid=21283, Unknown=0, NotChecked=0, Total=30450 [2021-05-06 12:06:59,693 INFO L87 Difference]: Start difference. First operand 506 states and 510 transitions. Second operand has 175 states, 175 states have (on average 1.64) internal successors, (287), 174 states have internal predecessors, (287), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:23,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:23,096 INFO L93 Difference]: Finished difference Result 795 states and 809 transitions. [2021-05-06 12:07:23,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 175 states. [2021-05-06 12:07:23,097 INFO L78 Accepts]: Start accepts. Automaton has has 175 states, 175 states have (on average 1.64) internal successors, (287), 174 states have internal predecessors, (287), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 291 [2021-05-06 12:07:23,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:23,098 INFO L225 Difference]: With dead ends: 795 [2021-05-06 12:07:23,098 INFO L226 Difference]: Without dead ends: 513 [2021-05-06 12:07:23,102 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 116 SyntacticMatches, 1 SemanticMatches, 345 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35067 ImplicationChecksByTransitivity, 21196.1ms TimeCoverageRelationStatistics Valid=27495, Invalid=92567, Unknown=0, NotChecked=0, Total=120062 [2021-05-06 12:07:23,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 513 states. [2021-05-06 12:07:23,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 513 to 297. [2021-05-06 12:07:23,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 297 states, 292 states have (on average 1.0136986301369864) internal successors, (296), 292 states have internal predecessors, (296), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:23,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 300 transitions. [2021-05-06 12:07:23,116 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 300 transitions. Word has length 291 [2021-05-06 12:07:23,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:23,116 INFO L480 AbstractCegarLoop]: Abstraction has 297 states and 300 transitions. [2021-05-06 12:07:23,116 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 175 states, 175 states have (on average 1.64) internal successors, (287), 174 states have internal predecessors, (287), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:23,116 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 300 transitions. [2021-05-06 12:07:23,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2021-05-06 12:07:23,117 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:23,118 INFO L523 BasicCegarLoop]: trace histogram [111, 110, 62, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:23,118 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable185 [2021-05-06 12:07:23,118 INFO L428 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:23,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:23,118 INFO L82 PathProgramCache]: Analyzing trace with hash 1725061440, now seen corresponding path program 62 times [2021-05-06 12:07:23,118 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:23,118 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [918312805] [2021-05-06 12:07:23,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:23,131 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:07:23,145 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:23,146 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:23,153 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:23,155 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:23,163 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:07:23,177 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:23,179 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:07:23,185 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:23,189 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:07:23,192 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:07:23,200 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:23,201 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:23,203 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:07:23,209 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:23,213 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:07:23,218 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:07:23,225 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:23,229 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:07:23,243 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:23,245 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:23,253 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:23,255 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:23,263 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:07:23,277 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 12:07:23,278 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:23,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:24,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:24,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:24,854 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:24,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:24,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:30,671 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:30,671 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [918312805] [2021-05-06 12:07:30,671 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [918312805] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:30,671 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:30,671 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [178] imperfect sequences [] total 178 [2021-05-06 12:07:30,671 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44273175] [2021-05-06 12:07:30,671 INFO L460 AbstractCegarLoop]: Interpolant automaton has 178 states [2021-05-06 12:07:30,671 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:30,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 178 interpolants. [2021-05-06 12:07:30,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9473, Invalid=22033, Unknown=0, NotChecked=0, Total=31506 [2021-05-06 12:07:30,673 INFO L87 Difference]: Start difference. First operand 297 states and 300 transitions. Second operand has 178 states, 178 states have (on average 1.6404494382022472) internal successors, (292), 177 states have internal predecessors, (292), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)