/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_14.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 11:55:34,985 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 11:55:34,987 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 11:55:35,008 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 11:55:35,054 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 11:55:35,054 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 11:55:35,055 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 11:55:35,058 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 11:55:35,068 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 11:55:35,068 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 11:55:35,069 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 11:55:35,069 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 11:55:35,069 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 11:55:35,070 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 11:55:35,070 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 11:55:35,070 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 11:55:35,070 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 11:55:35,070 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 11:55:35,070 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 11:55:35,070 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 11:55:35,070 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 11:55:35,070 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 11:55:35,071 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 11:55:35,071 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 11:55:35,071 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 11:55:35,071 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 11:55:35,071 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:55:35,071 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 11:55:35,071 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 11:55:35,071 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 11:55:35,071 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 11:55:35,071 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 11:55:35,319 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 11:55:35,340 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 11:55:35,341 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 11:55:35,342 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 11:55:35,343 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 11:55:35,343 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_14.c [2021-05-06 11:55:35,396 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6f7bb7d64/1ed2eb17ca66439fbcafe93513b9b64f/FLAGb6f231132 [2021-05-06 11:55:35,747 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 11:55:35,747 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_14.c [2021-05-06 11:55:35,751 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6f7bb7d64/1ed2eb17ca66439fbcafe93513b9b64f/FLAGb6f231132 [2021-05-06 11:55:35,763 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6f7bb7d64/1ed2eb17ca66439fbcafe93513b9b64f [2021-05-06 11:55:35,765 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 11:55:35,767 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 11:55:35,770 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 11:55:35,770 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 11:55:35,773 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 11:55:35,774 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:55:35" (1/1) ... [2021-05-06 11:55:35,774 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@e6acd4c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:35, skipping insertion in model container [2021-05-06 11:55:35,774 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:55:35" (1/1) ... [2021-05-06 11:55:35,779 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 11:55:35,788 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 11:55:35,900 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_14.c[319,332] [2021-05-06 11:55:35,911 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:55:35,916 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 11:55:35,932 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_14.c[319,332] [2021-05-06 11:55:35,954 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:55:35,963 INFO L208 MainTranslator]: Completed translation [2021-05-06 11:55:35,964 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:35 WrapperNode [2021-05-06 11:55:35,964 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 11:55:35,965 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 11:55:35,965 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 11:55:35,965 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 11:55:35,972 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:35" (1/1) ... [2021-05-06 11:55:35,972 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:35" (1/1) ... [2021-05-06 11:55:35,977 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:35" (1/1) ... [2021-05-06 11:55:35,977 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:35" (1/1) ... [2021-05-06 11:55:35,984 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:35" (1/1) ... [2021-05-06 11:55:35,989 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:35" (1/1) ... [2021-05-06 11:55:35,993 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:35" (1/1) ... [2021-05-06 11:55:35,998 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 11:55:35,999 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 11:55:35,999 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 11:55:35,999 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 11:55:36,000 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:35" (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 11:55:36,067 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 11:55:36,067 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 11:55:36,068 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 11:55:36,068 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 11:55:36,068 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 11:55:36,068 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 11:55:36,068 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 11:55:36,068 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 11:55:36,069 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 11:55:36,069 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 11:55:36,069 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 11:55:36,069 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 11:55:36,069 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 11:55:36,069 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 11:55:36,069 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 11:55:36,070 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 11:55:36,070 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 11:55:36,257 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 11:55:36,258 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 11:55:36,259 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:55:36 BoogieIcfgContainer [2021-05-06 11:55:36,259 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 11:55:36,260 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 11:55:36,260 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 11:55:36,262 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 11:55:36,262 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 11:55:35" (1/3) ... [2021-05-06 11:55:36,262 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3795faf4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:55:36, skipping insertion in model container [2021-05-06 11:55:36,262 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:55:35" (2/3) ... [2021-05-06 11:55:36,262 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3795faf4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:55:36, skipping insertion in model container [2021-05-06 11:55:36,263 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:55:36" (3/3) ... [2021-05-06 11:55:36,263 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_14.c [2021-05-06 11:55:36,284 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 11:55:36,286 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 11:55:36,301 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 11:55:36,326 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 11:55:36,326 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 11:55:36,326 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 11:55:36,326 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 11:55:36,326 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 11:55:36,326 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 11:55:36,326 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 11:55:36,326 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 11:55:36,348 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 11:55:36,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 11:55:36,352 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:36,353 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:36,353 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:36,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:36,356 INFO L82 PathProgramCache]: Analyzing trace with hash -1104150160, now seen corresponding path program 1 times [2021-05-06 11:55:36,363 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:36,363 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [519100007] [2021-05-06 11:55:36,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:36,404 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:55:36,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:36,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:36,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:36,539 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:36,540 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:36,540 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [519100007] [2021-05-06 11:55:36,541 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [519100007] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:36,541 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:36,541 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 11:55:36,541 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [509868466] [2021-05-06 11:55:36,544 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 11:55:36,544 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:36,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 11:55:36,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:55:36,553 INFO L87 Difference]: Start difference. First operand has 22 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) 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 11:55:36,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:36,616 INFO L93 Difference]: Finished difference Result 36 states and 47 transitions. [2021-05-06 11:55:36,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 11:55:36,617 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 11:55:36,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:36,622 INFO L225 Difference]: With dead ends: 36 [2021-05-06 11:55:36,622 INFO L226 Difference]: Without dead ends: 17 [2021-05-06 11:55:36,625 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 42.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:55:36,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-06 11:55:36,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-06 11:55:36,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:55:36,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2021-05-06 11:55:36,658 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 12 [2021-05-06 11:55:36,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:36,658 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2021-05-06 11:55:36,658 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 11:55:36,658 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2021-05-06 11:55:36,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 11:55:36,659 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:36,659 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:36,659 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 11:55:36,659 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:36,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:36,663 INFO L82 PathProgramCache]: Analyzing trace with hash -1394135754, now seen corresponding path program 1 times [2021-05-06 11:55:36,663 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:36,663 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1472016341] [2021-05-06 11:55:36,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:36,666 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:55:36,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:36,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:36,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:36,720 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:36,720 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:36,721 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1472016341] [2021-05-06 11:55:36,721 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1472016341] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:36,721 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:36,721 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 11:55:36,721 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142514035] [2021-05-06 11:55:36,722 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 11:55:36,722 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:36,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 11:55:36,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 11:55:36,722 INFO L87 Difference]: Start difference. First operand 17 states and 20 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 11:55:36,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:36,776 INFO L93 Difference]: Finished difference Result 30 states and 38 transitions. [2021-05-06 11:55:36,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 11:55:36,776 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 11:55:36,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:36,777 INFO L225 Difference]: With dead ends: 30 [2021-05-06 11:55:36,777 INFO L226 Difference]: Without dead ends: 19 [2021-05-06 11:55:36,778 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 39.0ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:55:36,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-06 11:55:36,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-06 11:55:36,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:55:36,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2021-05-06 11:55:36,783 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 12 [2021-05-06 11:55:36,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:36,783 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2021-05-06 11:55:36,783 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 11:55:36,783 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2021-05-06 11:55:36,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-06 11:55:36,784 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:36,784 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:36,784 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 11:55:36,784 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:36,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:36,785 INFO L82 PathProgramCache]: Analyzing trace with hash 479542393, now seen corresponding path program 1 times [2021-05-06 11:55:36,785 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:36,785 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [557670208] [2021-05-06 11:55:36,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:36,831 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:36,848 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:36,861 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:36,867 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:36,877 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:36,879 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:55:36,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:36,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:36,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:36,954 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:36,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:37,000 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:37,000 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [557670208] [2021-05-06 11:55:37,001 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [557670208] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:37,001 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:37,001 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 11:55:37,001 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [238303303] [2021-05-06 11:55:37,001 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 11:55:37,001 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:37,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 11:55:37,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:55:37,002 INFO L87 Difference]: Start difference. First operand 19 states and 22 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 11:55:37,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:37,133 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2021-05-06 11:55:37,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 11:55:37,134 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 11:55:37,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:37,135 INFO L225 Difference]: With dead ends: 32 [2021-05-06 11:55:37,136 INFO L226 Difference]: Without dead ends: 23 [2021-05-06 11:55:37,138 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 113.7ms TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:55:37,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-06 11:55:37,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-06 11:55:37,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 16 states have (on average 1.3125) internal successors, (21), 17 states have internal predecessors, (21), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:55:37,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2021-05-06 11:55:37,150 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 14 [2021-05-06 11:55:37,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:37,150 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2021-05-06 11:55:37,150 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 11:55:37,150 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2021-05-06 11:55:37,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-06 11:55:37,151 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:37,151 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:37,152 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 11:55:37,152 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:37,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:37,152 INFO L82 PathProgramCache]: Analyzing trace with hash -1190018304, now seen corresponding path program 1 times [2021-05-06 11:55:37,152 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:37,152 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [977160053] [2021-05-06 11:55:37,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:37,170 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:37,190 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:37,196 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:37,203 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:37,211 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:37,223 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:37,241 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:37,253 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:37,266 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:37,269 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:37,280 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:37,297 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:37,300 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:37,308 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:37,328 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:37,331 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:37,343 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:37,345 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:37,357 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:37,372 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:37,382 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:37,383 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:37,391 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:37,402 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:37,410 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:37,412 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:37,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:37,460 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:37,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:37,481 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:37,483 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:37,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:37,551 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:37,551 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [977160053] [2021-05-06 11:55:37,551 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [977160053] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:37,551 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:37,551 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:55:37,551 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296743057] [2021-05-06 11:55:37,552 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:55:37,552 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:37,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:55:37,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:55:37,553 INFO L87 Difference]: Start difference. First operand 23 states and 27 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 11:55:37,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:37,772 INFO L93 Difference]: Finished difference Result 43 states and 56 transitions. [2021-05-06 11:55:37,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:55:37,773 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 11:55:37,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:37,774 INFO L225 Difference]: With dead ends: 43 [2021-05-06 11:55:37,774 INFO L226 Difference]: Without dead ends: 28 [2021-05-06 11:55:37,775 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 186.6ms TimeCoverageRelationStatistics Valid=75, Invalid=135, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:55:37,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-06 11:55:37,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-05-06 11:55:37,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 22 states have internal predecessors, (26), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:55:37,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2021-05-06 11:55:37,786 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 19 [2021-05-06 11:55:37,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:37,786 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2021-05-06 11:55:37,787 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 11:55:37,787 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2021-05-06 11:55:37,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-06 11:55:37,787 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:37,788 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:37,788 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-06 11:55:37,788 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:37,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:37,789 INFO L82 PathProgramCache]: Analyzing trace with hash 982375981, now seen corresponding path program 2 times [2021-05-06 11:55:37,789 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:37,789 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2010353718] [2021-05-06 11:55:37,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:37,801 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:37,809 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:37,814 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:37,819 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:37,826 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:37,837 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:37,859 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:37,863 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:37,872 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:37,875 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:37,885 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:37,898 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:37,900 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:37,905 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:37,908 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:37,914 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:37,923 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:37,925 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:37,947 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:37,962 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:37,966 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:37,967 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:37,973 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:37,986 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:37,993 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:37,994 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:38,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:38,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:38,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:38,065 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:38,066 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:38,067 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:38,153 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:38,153 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2010353718] [2021-05-06 11:55:38,153 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2010353718] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:38,153 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:38,153 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 11:55:38,153 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960653672] [2021-05-06 11:55:38,153 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 11:55:38,153 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:38,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 11:55:38,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:55:38,154 INFO L87 Difference]: Start difference. First operand 28 states and 32 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 11:55:38,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:38,448 INFO L93 Difference]: Finished difference Result 53 states and 66 transitions. [2021-05-06 11:55:38,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 11:55:38,448 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 11:55:38,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:38,449 INFO L225 Difference]: With dead ends: 53 [2021-05-06 11:55:38,449 INFO L226 Difference]: Without dead ends: 33 [2021-05-06 11:55:38,450 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 281.0ms TimeCoverageRelationStatistics Valid=135, Invalid=285, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:55:38,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-06 11:55:38,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-05-06 11:55:38,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 27 states have internal predecessors, (31), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:55:38,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2021-05-06 11:55:38,454 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2021-05-06 11:55:38,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:38,454 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2021-05-06 11:55:38,454 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 11:55:38,454 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2021-05-06 11:55:38,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-06 11:55:38,455 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:38,455 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:38,455 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-06 11:55:38,455 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:38,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:38,455 INFO L82 PathProgramCache]: Analyzing trace with hash -1672299444, now seen corresponding path program 3 times [2021-05-06 11:55:38,455 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:38,455 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1505191516] [2021-05-06 11:55:38,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:38,466 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:38,473 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:38,477 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:38,481 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:38,487 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 11:55:38,493 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:38,495 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:38,498 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:38,506 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:38,508 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:38,527 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:38,539 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:38,541 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:38,558 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:38,560 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:38,564 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:38,572 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:38,574 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:38,593 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:38,607 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:38,611 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:38,612 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:38,624 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:38,632 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:38,639 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:38,640 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:38,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:38,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:38,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:38,725 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:38,726 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:38,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:38,821 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:38,822 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1505191516] [2021-05-06 11:55:38,822 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1505191516] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:38,822 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:38,822 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:55:38,822 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814045055] [2021-05-06 11:55:38,822 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:55:38,822 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:38,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:55:38,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:55:38,823 INFO L87 Difference]: Start difference. First operand 33 states and 37 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 11:55:39,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:39,218 INFO L93 Difference]: Finished difference Result 63 states and 76 transitions. [2021-05-06 11:55:39,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:55:39,218 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 11:55:39,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:39,219 INFO L225 Difference]: With dead ends: 63 [2021-05-06 11:55:39,219 INFO L226 Difference]: Without dead ends: 38 [2021-05-06 11:55:39,219 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 374.5ms TimeCoverageRelationStatistics Valid=210, Invalid=492, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:55:39,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-06 11:55:39,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-05-06 11:55:39,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 32 states have internal predecessors, (36), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:55:39,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2021-05-06 11:55:39,225 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 29 [2021-05-06 11:55:39,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:39,225 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2021-05-06 11:55:39,226 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 11:55:39,226 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2021-05-06 11:55:39,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 11:55:39,226 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:39,226 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:39,226 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-06 11:55:39,226 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:39,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:39,227 INFO L82 PathProgramCache]: Analyzing trace with hash -1955497503, now seen corresponding path program 4 times [2021-05-06 11:55:39,227 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:39,227 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [924381811] [2021-05-06 11:55:39,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:39,240 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:39,247 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:39,261 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:39,266 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:39,272 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:39,280 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:39,292 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:39,296 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:39,305 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:39,307 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:39,314 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:39,329 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:39,330 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:39,334 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:39,347 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:39,350 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:39,359 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:39,361 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:39,369 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:39,382 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:39,390 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:39,395 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:39,400 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:39,404 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:39,410 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:39,411 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:39,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:39,486 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:39,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:39,492 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:39,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:39,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:39,601 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:39,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [924381811] [2021-05-06 11:55:39,602 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [924381811] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:39,602 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:39,602 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:55:39,602 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63203624] [2021-05-06 11:55:39,602 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:55:39,602 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:39,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:55:39,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=204, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:55:39,603 INFO L87 Difference]: Start difference. First operand 38 states and 42 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 11:55:40,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:40,108 INFO L93 Difference]: Finished difference Result 73 states and 86 transitions. [2021-05-06 11:55:40,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 11:55:40,109 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 11:55:40,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:40,109 INFO L225 Difference]: With dead ends: 73 [2021-05-06 11:55:40,109 INFO L226 Difference]: Without dead ends: 43 [2021-05-06 11:55:40,110 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 462.4ms TimeCoverageRelationStatistics Valid=300, Invalid=756, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:55:40,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-06 11:55:40,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-05-06 11:55:40,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 37 states have internal predecessors, (41), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:55:40,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2021-05-06 11:55:40,114 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2021-05-06 11:55:40,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:40,115 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2021-05-06 11:55:40,115 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 11:55:40,115 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2021-05-06 11:55:40,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-06 11:55:40,115 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:40,115 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:40,115 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-06 11:55:40,116 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:40,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:40,116 INFO L82 PathProgramCache]: Analyzing trace with hash -940287080, now seen corresponding path program 5 times [2021-05-06 11:55:40,116 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:40,116 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [34783057] [2021-05-06 11:55:40,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:40,122 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:40,122 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:40,127 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:40,135 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:40,142 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:40,147 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:40,160 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:40,161 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:40,170 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:40,172 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:40,180 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:40,193 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:40,195 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:40,198 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:40,211 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:40,213 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:40,228 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:40,230 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:40,238 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:40,250 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:40,256 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:40,257 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:40,261 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:40,272 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:40,279 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:40,280 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:40,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:40,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:40,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:40,335 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:40,336 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:40,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:40,494 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:40,494 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [34783057] [2021-05-06 11:55:40,494 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [34783057] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:40,496 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:40,496 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:55:40,496 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472697683] [2021-05-06 11:55:40,497 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:55:40,497 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:40,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:55:40,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=283, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:55:40,499 INFO L87 Difference]: Start difference. First operand 43 states and 47 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 11:55:41,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:41,161 INFO L93 Difference]: Finished difference Result 83 states and 96 transitions. [2021-05-06 11:55:41,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:55:41,161 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 11:55:41,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:41,162 INFO L225 Difference]: With dead ends: 83 [2021-05-06 11:55:41,162 INFO L226 Difference]: Without dead ends: 48 [2021-05-06 11:55:41,162 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 354 ImplicationChecksByTransitivity, 590.9ms TimeCoverageRelationStatistics Valid=405, Invalid=1077, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 11:55:41,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-06 11:55:41,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-05-06 11:55:41,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 42 states have internal predecessors, (46), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:55:41,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2021-05-06 11:55:41,167 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 39 [2021-05-06 11:55:41,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:41,167 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2021-05-06 11:55:41,167 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 11:55:41,168 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2021-05-06 11:55:41,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-06 11:55:41,168 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:41,168 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:41,168 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-06 11:55:41,168 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:41,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:41,169 INFO L82 PathProgramCache]: Analyzing trace with hash 651743125, now seen corresponding path program 6 times [2021-05-06 11:55:41,169 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:41,169 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1968640867] [2021-05-06 11:55:41,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:41,176 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:41,187 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:41,191 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:41,195 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:41,201 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:41,204 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:41,217 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:41,218 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:41,226 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:41,228 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:41,236 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:41,249 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:41,250 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:41,253 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:41,254 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:41,256 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:41,265 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:41,267 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:41,285 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:41,297 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:41,301 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:41,301 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:41,305 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:41,313 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:41,319 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:41,320 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:41,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:41,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:41,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:41,381 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:41,382 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:41,383 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:41,588 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:41,588 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1968640867] [2021-05-06 11:55:41,588 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1968640867] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:41,588 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:41,588 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:55:41,588 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781934144] [2021-05-06 11:55:41,588 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:55:41,588 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:41,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:55:41,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=375, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:55:41,589 INFO L87 Difference]: Start difference. First operand 48 states and 52 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 11:55:42,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:42,350 INFO L93 Difference]: Finished difference Result 93 states and 106 transitions. [2021-05-06 11:55:42,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 11:55:42,350 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 11:55:42,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:42,351 INFO L225 Difference]: With dead ends: 93 [2021-05-06 11:55:42,351 INFO L226 Difference]: Without dead ends: 53 [2021-05-06 11:55:42,352 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 487 ImplicationChecksByTransitivity, 720.6ms TimeCoverageRelationStatistics Valid=525, Invalid=1455, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 11:55:42,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-06 11:55:42,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-05-06 11:55:42,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 46 states have (on average 1.108695652173913) internal successors, (51), 47 states have internal predecessors, (51), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:55:42,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 57 transitions. [2021-05-06 11:55:42,358 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 57 transitions. Word has length 44 [2021-05-06 11:55:42,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:42,358 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 57 transitions. [2021-05-06 11:55:42,358 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 11:55:42,358 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 57 transitions. [2021-05-06 11:55:42,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 11:55:42,359 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:42,359 INFO L523 BasicCegarLoop]: trace histogram [15, 14, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:42,359 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-05-06 11:55:42,359 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:42,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:42,360 INFO L82 PathProgramCache]: Analyzing trace with hash 1669193956, now seen corresponding path program 7 times [2021-05-06 11:55:42,360 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:42,360 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [673018647] [2021-05-06 11:55:42,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:42,368 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:42,369 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:42,373 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:42,384 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:42,391 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:42,397 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:42,411 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:42,413 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:42,420 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:42,422 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:42,431 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:42,445 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 11:55:42,446 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:42,449 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:42,463 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:42,465 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:42,473 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:42,475 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:42,483 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:42,495 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:42,502 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:42,508 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:42,511 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:42,517 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:42,523 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:42,524 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:42,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:42,588 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:42,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:42,592 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:42,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:42,594 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:42,802 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:42,803 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [673018647] [2021-05-06 11:55:42,803 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [673018647] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:42,803 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:42,803 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 11:55:42,803 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [867961487] [2021-05-06 11:55:42,803 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 11:55:42,803 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:42,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 11:55:42,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=480, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:55:42,804 INFO L87 Difference]: Start difference. First operand 53 states and 57 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 11:55:43,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:43,726 INFO L93 Difference]: Finished difference Result 103 states and 116 transitions. [2021-05-06 11:55:43,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-06 11:55:43,726 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 11:55:43,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:43,727 INFO L225 Difference]: With dead ends: 103 [2021-05-06 11:55:43,727 INFO L226 Difference]: Without dead ends: 58 [2021-05-06 11:55:43,728 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 641 ImplicationChecksByTransitivity, 865.4ms TimeCoverageRelationStatistics Valid=660, Invalid=1890, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 11:55:43,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-06 11:55:43,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2021-05-06 11:55:43,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 51 states have (on average 1.0980392156862746) internal successors, (56), 52 states have internal predecessors, (56), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:55:43,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 62 transitions. [2021-05-06 11:55:43,733 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 62 transitions. Word has length 49 [2021-05-06 11:55:43,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:43,733 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 62 transitions. [2021-05-06 11:55:43,733 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 11:55:43,733 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 62 transitions. [2021-05-06 11:55:43,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-06 11:55:43,734 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:43,734 INFO L523 BasicCegarLoop]: trace histogram [17, 16, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:43,734 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-05-06 11:55:43,734 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:43,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:43,734 INFO L82 PathProgramCache]: Analyzing trace with hash -820207799, now seen corresponding path program 8 times [2021-05-06 11:55:43,735 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:43,735 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [333815198] [2021-05-06 11:55:43,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:43,747 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:43,753 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:43,760 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:43,764 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:43,770 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:43,776 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:43,776 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:43,778 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:43,786 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:43,788 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:43,813 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:43,826 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:43,828 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:43,831 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:43,845 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:43,846 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:43,855 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:43,857 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:43,867 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:43,880 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:43,883 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:43,883 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:43,887 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:43,896 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:43,903 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:43,903 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:43,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:43,972 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:43,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:43,975 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:43,976 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:43,977 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:44,228 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:44,228 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [333815198] [2021-05-06 11:55:44,228 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [333815198] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:44,228 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:44,229 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2021-05-06 11:55:44,229 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704900891] [2021-05-06 11:55:44,229 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-06 11:55:44,229 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:44,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-06 11:55:44,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=272, Invalid=598, Unknown=0, NotChecked=0, Total=870 [2021-05-06 11:55:44,230 INFO L87 Difference]: Start difference. First operand 58 states and 62 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 11:55:45,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:45,406 INFO L93 Difference]: Finished difference Result 113 states and 126 transitions. [2021-05-06 11:55:45,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-06 11:55:45,406 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 11:55:45,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:45,407 INFO L225 Difference]: With dead ends: 113 [2021-05-06 11:55:45,407 INFO L226 Difference]: Without dead ends: 63 [2021-05-06 11:55:45,408 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 816 ImplicationChecksByTransitivity, 1005.5ms TimeCoverageRelationStatistics Valid=810, Invalid=2382, Unknown=0, NotChecked=0, Total=3192 [2021-05-06 11:55:45,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-06 11:55:45,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-05-06 11:55:45,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 56 states have (on average 1.0892857142857142) internal successors, (61), 57 states have internal predecessors, (61), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:55:45,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 67 transitions. [2021-05-06 11:55:45,415 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 67 transitions. Word has length 54 [2021-05-06 11:55:45,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:45,415 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 67 transitions. [2021-05-06 11:55:45,415 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 11:55:45,415 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 67 transitions. [2021-05-06 11:55:45,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-06 11:55:45,416 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:45,416 INFO L523 BasicCegarLoop]: trace histogram [19, 18, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:45,416 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-05-06 11:55:45,416 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:45,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:45,416 INFO L82 PathProgramCache]: Analyzing trace with hash -642347984, now seen corresponding path program 9 times [2021-05-06 11:55:45,416 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:45,417 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1403584377] [2021-05-06 11:55:45,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:45,422 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:45,427 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:45,431 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:45,434 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:45,441 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:45,445 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:45,459 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:45,461 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:45,468 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:45,469 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:45,477 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:45,490 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:45,492 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:45,501 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:45,519 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:45,525 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:45,534 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:45,536 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:45,546 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:45,560 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:45,562 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:45,563 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:45,567 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:45,576 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:45,583 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:45,584 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:45,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:45,676 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:45,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:45,680 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:45,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:45,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:46,002 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:46,002 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1403584377] [2021-05-06 11:55:46,002 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1403584377] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:46,002 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:46,002 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-06 11:55:46,002 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1342775816] [2021-05-06 11:55:46,002 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-06 11:55:46,003 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:46,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-06 11:55:46,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=729, Unknown=0, NotChecked=0, Total=1056 [2021-05-06 11:55:46,003 INFO L87 Difference]: Start difference. First operand 63 states and 67 transitions. Second operand has 33 states, 33 states have (on average 1.6666666666666667) internal successors, (55), 32 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:47,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:47,340 INFO L93 Difference]: Finished difference Result 123 states and 136 transitions. [2021-05-06 11:55:47,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-06 11:55:47,342 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.6666666666666667) internal successors, (55), 32 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-06 11:55:47,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:47,342 INFO L225 Difference]: With dead ends: 123 [2021-05-06 11:55:47,342 INFO L226 Difference]: Without dead ends: 68 [2021-05-06 11:55:47,344 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1012 ImplicationChecksByTransitivity, 1212.5ms TimeCoverageRelationStatistics Valid=975, Invalid=2931, Unknown=0, NotChecked=0, Total=3906 [2021-05-06 11:55:47,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-06 11:55:47,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-05-06 11:55:47,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 61 states have (on average 1.0819672131147542) internal successors, (66), 62 states have internal predecessors, (66), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:55:47,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 72 transitions. [2021-05-06 11:55:47,350 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 72 transitions. Word has length 59 [2021-05-06 11:55:47,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:47,350 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 72 transitions. [2021-05-06 11:55:47,350 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 1.6666666666666667) internal successors, (55), 32 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:47,350 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 72 transitions. [2021-05-06 11:55:47,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-06 11:55:47,351 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:47,351 INFO L523 BasicCegarLoop]: trace histogram [21, 20, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:47,351 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-05-06 11:55:47,351 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:47,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:47,351 INFO L82 PathProgramCache]: Analyzing trace with hash -1789548291, now seen corresponding path program 10 times [2021-05-06 11:55:47,351 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:47,351 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1024774502] [2021-05-06 11:55:47,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:47,360 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 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 11:55:47,365 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:47,373 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:47,380 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:47,387 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:47,387 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,389 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,397 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:47,399 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:47,430 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:47,443 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:47,445 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:47,448 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:47,449 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,450 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,459 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:47,461 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:47,481 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:47,494 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:47,496 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:47,497 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:47,500 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:47,510 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:47,517 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:47,517 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:47,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:47,626 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 11:55:47,629 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:47,630 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:47,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:47,953 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:47,954 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1024774502] [2021-05-06 11:55:47,954 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1024774502] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:47,954 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:47,954 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2021-05-06 11:55:47,954 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034730626] [2021-05-06 11:55:47,954 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-06 11:55:47,954 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:47,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-06 11:55:47,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=387, Invalid=873, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 11:55:47,955 INFO L87 Difference]: Start difference. First operand 68 states and 72 transitions. Second operand has 36 states, 36 states have (on average 1.6666666666666667) internal successors, (60), 35 states have internal predecessors, (60), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:49,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:49,379 INFO L93 Difference]: Finished difference Result 133 states and 146 transitions. [2021-05-06 11:55:49,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-06 11:55:49,379 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.6666666666666667) internal successors, (60), 35 states have internal predecessors, (60), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 64 [2021-05-06 11:55:49,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:49,380 INFO L225 Difference]: With dead ends: 133 [2021-05-06 11:55:49,380 INFO L226 Difference]: Without dead ends: 73 [2021-05-06 11:55:49,381 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1219 ImplicationChecksByTransitivity, 1286.7ms TimeCoverageRelationStatistics Valid=1155, Invalid=3537, Unknown=0, NotChecked=0, Total=4692 [2021-05-06 11:55:49,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-06 11:55:49,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2021-05-06 11:55:49,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 66 states have (on average 1.0757575757575757) internal successors, (71), 67 states have internal predecessors, (71), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:55:49,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 77 transitions. [2021-05-06 11:55:49,386 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 77 transitions. Word has length 64 [2021-05-06 11:55:49,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:49,386 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 77 transitions. [2021-05-06 11:55:49,386 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 1.6666666666666667) internal successors, (60), 35 states have internal predecessors, (60), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:49,386 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 77 transitions. [2021-05-06 11:55:49,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-06 11:55:49,387 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:49,387 INFO L523 BasicCegarLoop]: trace histogram [23, 22, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:49,387 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-05-06 11:55:49,387 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:49,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:49,387 INFO L82 PathProgramCache]: Analyzing trace with hash 883268988, now seen corresponding path program 11 times [2021-05-06 11:55:49,388 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:49,388 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2082567623] [2021-05-06 11:55:49,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:49,397 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:49,404 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:49,408 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:49,412 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:49,419 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:49,423 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:49,436 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:49,438 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:49,446 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:49,448 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:49,456 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:49,469 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:49,470 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:49,473 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:49,473 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:49,475 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:49,483 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:49,485 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:49,503 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:49,517 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:49,524 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:49,525 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:49,528 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:49,537 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:49,544 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:49,544 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:49,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:49,691 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:49,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:49,699 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:49,700 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:49,702 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:50,112 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:50,113 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2082567623] [2021-05-06 11:55:50,113 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2082567623] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:50,113 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:50,113 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2021-05-06 11:55:50,113 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699186169] [2021-05-06 11:55:50,113 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-06 11:55:50,113 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:50,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-06 11:55:50,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=452, Invalid=1030, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 11:55:50,114 INFO L87 Difference]: Start difference. First operand 73 states and 77 transitions. Second operand has 39 states, 39 states have (on average 1.6666666666666667) internal successors, (65), 38 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:51,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:51,740 INFO L93 Difference]: Finished difference Result 143 states and 156 transitions. [2021-05-06 11:55:51,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-06 11:55:51,740 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.6666666666666667) internal successors, (65), 38 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 69 [2021-05-06 11:55:51,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:51,741 INFO L225 Difference]: With dead ends: 143 [2021-05-06 11:55:51,741 INFO L226 Difference]: Without dead ends: 78 [2021-05-06 11:55:51,742 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1467 ImplicationChecksByTransitivity, 1537.4ms TimeCoverageRelationStatistics Valid=1350, Invalid=4200, Unknown=0, NotChecked=0, Total=5550 [2021-05-06 11:55:51,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-06 11:55:51,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2021-05-06 11:55:51,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 71 states have (on average 1.0704225352112675) internal successors, (76), 72 states have internal predecessors, (76), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:55:51,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 82 transitions. [2021-05-06 11:55:51,748 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 82 transitions. Word has length 69 [2021-05-06 11:55:51,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:51,748 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 82 transitions. [2021-05-06 11:55:51,748 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 1.6666666666666667) internal successors, (65), 38 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:51,748 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 82 transitions. [2021-05-06 11:55:51,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-06 11:55:51,748 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:51,748 INFO L523 BasicCegarLoop]: trace histogram [25, 24, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:51,749 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-05-06 11:55:51,749 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:51,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:51,749 INFO L82 PathProgramCache]: Analyzing trace with hash 2103225521, now seen corresponding path program 12 times [2021-05-06 11:55:51,749 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:51,749 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1505752935] [2021-05-06 11:55:51,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:51,759 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:51,765 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:51,768 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:51,772 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:51,780 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:51,784 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:51,784 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:51,786 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:51,794 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:51,796 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:51,816 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:51,829 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:51,830 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:51,832 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:51,833 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:51,835 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:51,843 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:51,845 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:51,863 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:51,876 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:51,879 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:51,879 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:51,883 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:51,893 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:51,900 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:51,901 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:51,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:52,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:52,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:52,023 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:52,024 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:52,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:52,469 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:52,469 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1505752935] [2021-05-06 11:55:52,469 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1505752935] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:52,469 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:52,469 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2021-05-06 11:55:52,469 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108272401] [2021-05-06 11:55:52,469 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 11:55:52,469 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:52,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 11:55:52,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=522, Invalid=1200, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 11:55:52,470 INFO L87 Difference]: Start difference. First operand 78 states and 82 transitions. Second operand has 42 states, 42 states have (on average 1.6666666666666667) internal successors, (70), 41 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:54,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:54,244 INFO L93 Difference]: Finished difference Result 153 states and 166 transitions. [2021-05-06 11:55:54,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-06 11:55:54,244 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.6666666666666667) internal successors, (70), 41 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2021-05-06 11:55:54,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:54,245 INFO L225 Difference]: With dead ends: 153 [2021-05-06 11:55:54,245 INFO L226 Difference]: Without dead ends: 83 [2021-05-06 11:55:54,246 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1726 ImplicationChecksByTransitivity, 1689.4ms TimeCoverageRelationStatistics Valid=1560, Invalid=4920, Unknown=0, NotChecked=0, Total=6480 [2021-05-06 11:55:54,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-06 11:55:54,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-05-06 11:55:54,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 76 states have (on average 1.0657894736842106) internal successors, (81), 77 states have internal predecessors, (81), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:55:54,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 87 transitions. [2021-05-06 11:55:54,252 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 87 transitions. Word has length 74 [2021-05-06 11:55:54,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:54,252 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 87 transitions. [2021-05-06 11:55:54,252 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 1.6666666666666667) internal successors, (70), 41 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:54,252 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 87 transitions. [2021-05-06 11:55:54,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-06 11:55:54,255 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:54,255 INFO L523 BasicCegarLoop]: trace histogram [27, 26, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:54,255 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-05-06 11:55:54,255 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:54,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:54,255 INFO L82 PathProgramCache]: Analyzing trace with hash 2039633096, now seen corresponding path program 13 times [2021-05-06 11:55:54,255 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:54,255 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [465609200] [2021-05-06 11:55:54,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:54,261 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:54,261 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:54,265 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:54,274 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:54,281 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:54,293 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:54,307 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:54,308 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:54,317 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:54,319 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:54,327 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:54,341 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:54,341 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:54,345 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:54,358 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:54,359 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:54,367 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:54,368 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:54,376 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:54,389 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 11:55:54,393 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:54,401 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:54,405 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:54,409 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:54,416 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:54,416 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:54,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:54,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:54,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:54,547 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:54,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:54,549 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:55,045 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:55,046 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [465609200] [2021-05-06 11:55:55,046 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [465609200] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:55,046 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:55,046 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2021-05-06 11:55:55,046 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824107703] [2021-05-06 11:55:55,046 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-06 11:55:55,046 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:55,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-06 11:55:55,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=1383, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 11:55:55,047 INFO L87 Difference]: Start difference. First operand 83 states and 87 transitions. Second operand has 45 states, 45 states have (on average 1.6666666666666667) internal successors, (75), 44 states have internal predecessors, (75), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:57,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:57,038 INFO L93 Difference]: Finished difference Result 163 states and 176 transitions. [2021-05-06 11:55:57,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-06 11:55:57,038 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.6666666666666667) internal successors, (75), 44 states have internal predecessors, (75), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 79 [2021-05-06 11:55:57,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:57,039 INFO L225 Difference]: With dead ends: 163 [2021-05-06 11:55:57,039 INFO L226 Difference]: Without dead ends: 88 [2021-05-06 11:55:57,040 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2006 ImplicationChecksByTransitivity, 1878.1ms TimeCoverageRelationStatistics Valid=1785, Invalid=5697, Unknown=0, NotChecked=0, Total=7482 [2021-05-06 11:55:57,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-05-06 11:55:57,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2021-05-06 11:55:57,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 81 states have (on average 1.0617283950617284) internal successors, (86), 82 states have internal predecessors, (86), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:55:57,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 92 transitions. [2021-05-06 11:55:57,046 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 92 transitions. Word has length 79 [2021-05-06 11:55:57,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:57,047 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 92 transitions. [2021-05-06 11:55:57,047 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 1.6666666666666667) internal successors, (75), 44 states have internal predecessors, (75), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:57,047 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 92 transitions. [2021-05-06 11:55:57,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-05-06 11:55:57,047 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:57,048 INFO L523 BasicCegarLoop]: trace histogram [29, 28, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:57,048 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-05-06 11:55:57,048 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:57,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:57,048 INFO L82 PathProgramCache]: Analyzing trace with hash 566913637, now seen corresponding path program 14 times [2021-05-06 11:55:57,048 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:57,048 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1781404216] [2021-05-06 11:55:57,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:57,062 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:55:57,062 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:57,066 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:57,075 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:55:57,082 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:57,086 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:57,099 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:57,101 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:57,109 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:57,111 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:57,119 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:57,133 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:57,136 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:57,138 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:55:57,151 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:57,155 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:57,162 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:55:57,164 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:55:57,172 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:55:57,186 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:57,192 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:55:57,193 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:57,197 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:55:57,206 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:55:57,213 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:57,213 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:57,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:57,345 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:57,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:57,360 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:57,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:57,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:57,909 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:57,909 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1781404216] [2021-05-06 11:55:57,910 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1781404216] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:57,910 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:57,910 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2021-05-06 11:55:57,910 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709294013] [2021-05-06 11:55:57,910 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-06 11:55:57,910 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:57,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-06 11:55:57,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=677, Invalid=1579, Unknown=0, NotChecked=0, Total=2256 [2021-05-06 11:55:57,911 INFO L87 Difference]: Start difference. First operand 88 states and 92 transitions. Second operand has 48 states, 48 states have (on average 1.6666666666666667) internal successors, (80), 47 states have internal predecessors, (80), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:00,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:00,134 INFO L93 Difference]: Finished difference Result 173 states and 186 transitions. [2021-05-06 11:56:00,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-06 11:56:00,140 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.6666666666666667) internal successors, (80), 47 states have internal predecessors, (80), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 84 [2021-05-06 11:56:00,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:00,141 INFO L225 Difference]: With dead ends: 173 [2021-05-06 11:56:00,141 INFO L226 Difference]: Without dead ends: 93 [2021-05-06 11:56:00,142 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2307 ImplicationChecksByTransitivity, 2060.9ms TimeCoverageRelationStatistics Valid=2025, Invalid=6531, Unknown=0, NotChecked=0, Total=8556 [2021-05-06 11:56:00,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-06 11:56:00,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2021-05-06 11:56:00,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 86 states have (on average 1.058139534883721) internal successors, (91), 87 states have internal predecessors, (91), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:56:00,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 97 transitions. [2021-05-06 11:56:00,147 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 97 transitions. Word has length 84 [2021-05-06 11:56:00,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:00,148 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 97 transitions. [2021-05-06 11:56:00,148 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 1.6666666666666667) internal successors, (80), 47 states have internal predecessors, (80), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:00,148 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 97 transitions. [2021-05-06 11:56:00,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-06 11:56:00,148 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:00,148 INFO L523 BasicCegarLoop]: trace histogram [31, 30, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:00,149 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-05-06 11:56:00,149 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:00,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:00,149 INFO L82 PathProgramCache]: Analyzing trace with hash 84144660, now seen corresponding path program 15 times [2021-05-06 11:56:00,149 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:00,149 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1350504663] [2021-05-06 11:56:00,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:00,155 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:00,161 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:00,165 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:00,169 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:00,175 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:00,179 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:00,194 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:00,196 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:00,203 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:00,205 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:00,214 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:00,227 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:00,228 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:00,230 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:00,244 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:00,246 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:00,254 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:00,255 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:00,264 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:00,277 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 11:56:00,285 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:00,290 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:00,294 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:00,298 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:00,305 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 11:56:00,305 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:00,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:00,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:00,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:00,454 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 11:56:00,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:00,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:01,067 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:01,067 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1350504663] [2021-05-06 11:56:01,067 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1350504663] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:01,067 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:01,067 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2021-05-06 11:56:01,067 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657251621] [2021-05-06 11:56:01,068 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-06 11:56:01,068 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:01,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-06 11:56:01,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=762, Invalid=1788, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 11:56:01,068 INFO L87 Difference]: Start difference. First operand 93 states and 97 transitions. Second operand has 51 states, 51 states have (on average 1.6666666666666667) internal successors, (85), 50 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 11:56:03,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:03,617 INFO L93 Difference]: Finished difference Result 183 states and 196 transitions. [2021-05-06 11:56:03,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-06 11:56:03,618 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.6666666666666667) internal successors, (85), 50 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 11:56:03,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:03,618 INFO L225 Difference]: With dead ends: 183 [2021-05-06 11:56:03,618 INFO L226 Difference]: Without dead ends: 98 [2021-05-06 11:56:03,619 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2629 ImplicationChecksByTransitivity, 2304.2ms TimeCoverageRelationStatistics Valid=2280, Invalid=7422, Unknown=0, NotChecked=0, Total=9702 [2021-05-06 11:56:03,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-06 11:56:03,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2021-05-06 11:56:03,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 91 states have (on average 1.054945054945055) internal successors, (96), 92 states have internal predecessors, (96), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:56:03,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 102 transitions. [2021-05-06 11:56:03,624 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 102 transitions. Word has length 89 [2021-05-06 11:56:03,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:03,624 INFO L480 AbstractCegarLoop]: Abstraction has 98 states and 102 transitions. [2021-05-06 11:56:03,625 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 1.6666666666666667) internal successors, (85), 50 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 11:56:03,625 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 102 transitions. [2021-05-06 11:56:03,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-06 11:56:03,625 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:03,625 INFO L523 BasicCegarLoop]: trace histogram [33, 32, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:03,625 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2021-05-06 11:56:03,625 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:03,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:03,626 INFO L82 PathProgramCache]: Analyzing trace with hash 1475846681, now seen corresponding path program 16 times [2021-05-06 11:56:03,626 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:03,626 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1201505653] [2021-05-06 11:56:03,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:03,632 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:03,632 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:03,635 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:03,644 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:03,650 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:03,653 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:03,654 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:03,655 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:03,662 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:03,664 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:03,682 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:03,695 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:03,696 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:03,698 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:03,713 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:03,714 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:03,722 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:03,724 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:03,732 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:03,745 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:03,748 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:03,749 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:03,753 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:03,762 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:03,768 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:03,769 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:03,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:03,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:03,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:03,932 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:03,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:03,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:04,621 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:04,621 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1201505653] [2021-05-06 11:56:04,621 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1201505653] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:04,621 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:04,621 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2021-05-06 11:56:04,621 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993820628] [2021-05-06 11:56:04,621 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-06 11:56:04,621 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:04,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-06 11:56:04,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=852, Invalid=2010, Unknown=0, NotChecked=0, Total=2862 [2021-05-06 11:56:04,622 INFO L87 Difference]: Start difference. First operand 98 states and 102 transitions. Second operand has 54 states, 54 states have (on average 1.6666666666666667) internal successors, (90), 53 states have internal predecessors, (90), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:07,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:07,337 INFO L93 Difference]: Finished difference Result 193 states and 206 transitions. [2021-05-06 11:56:07,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-06 11:56:07,338 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.6666666666666667) internal successors, (90), 53 states have internal predecessors, (90), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 94 [2021-05-06 11:56:07,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:07,338 INFO L225 Difference]: With dead ends: 193 [2021-05-06 11:56:07,338 INFO L226 Difference]: Without dead ends: 103 [2021-05-06 11:56:07,339 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2972 ImplicationChecksByTransitivity, 2559.7ms TimeCoverageRelationStatistics Valid=2550, Invalid=8370, Unknown=0, NotChecked=0, Total=10920 [2021-05-06 11:56:07,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-05-06 11:56:07,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-05-06 11:56:07,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 96 states have (on average 1.0520833333333333) internal successors, (101), 97 states have internal predecessors, (101), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:56:07,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 107 transitions. [2021-05-06 11:56:07,345 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 107 transitions. Word has length 94 [2021-05-06 11:56:07,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:07,345 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 107 transitions. [2021-05-06 11:56:07,345 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 1.6666666666666667) internal successors, (90), 53 states have internal predecessors, (90), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:07,345 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 107 transitions. [2021-05-06 11:56:07,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-06 11:56:07,346 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:07,346 INFO L523 BasicCegarLoop]: trace histogram [35, 34, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:07,346 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2021-05-06 11:56:07,346 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:07,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:07,346 INFO L82 PathProgramCache]: Analyzing trace with hash -423512736, now seen corresponding path program 17 times [2021-05-06 11:56:07,346 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:07,346 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1328755565] [2021-05-06 11:56:07,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:07,354 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:07,360 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:07,364 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:07,368 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:07,375 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:07,378 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:07,379 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:07,381 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:07,388 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:07,389 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:07,408 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:07,421 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:07,422 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:07,424 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:07,425 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:07,441 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:07,449 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:07,451 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:07,470 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:07,483 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:07,486 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:07,488 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:07,493 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:07,503 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:07,512 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:07,512 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:07,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:07,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:07,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:07,749 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:07,751 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:08,502 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:08,502 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1328755565] [2021-05-06 11:56:08,502 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1328755565] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:08,502 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:08,502 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2021-05-06 11:56:08,502 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599775235] [2021-05-06 11:56:08,502 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-06 11:56:08,502 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:08,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-06 11:56:08,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1032, Invalid=2508, Unknown=0, NotChecked=0, Total=3540 [2021-05-06 11:56:08,503 INFO L87 Difference]: Start difference. First operand 103 states and 107 transitions. Second operand has 57 states, 57 states have (on average 1.6666666666666667) internal successors, (95), 56 states have internal predecessors, (95), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:11,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:11,524 INFO L93 Difference]: Finished difference Result 269 states and 282 transitions. [2021-05-06 11:56:11,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-05-06 11:56:11,524 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.6666666666666667) internal successors, (95), 56 states have internal predecessors, (95), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 99 [2021-05-06 11:56:11,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:11,525 INFO L225 Difference]: With dead ends: 269 [2021-05-06 11:56:11,525 INFO L226 Difference]: Without dead ends: 174 [2021-05-06 11:56:11,526 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3695 ImplicationChecksByTransitivity, 2843.1ms TimeCoverageRelationStatistics Valid=2925, Invalid=9957, Unknown=0, NotChecked=0, Total=12882 [2021-05-06 11:56:11,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2021-05-06 11:56:11,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 174. [2021-05-06 11:56:11,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 167 states have (on average 1.035928143712575) internal successors, (173), 168 states have internal predecessors, (173), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:56:11,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 179 transitions. [2021-05-06 11:56:11,536 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 179 transitions. Word has length 99 [2021-05-06 11:56:11,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:11,536 INFO L480 AbstractCegarLoop]: Abstraction has 174 states and 179 transitions. [2021-05-06 11:56:11,536 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 1.6666666666666667) internal successors, (95), 56 states have internal predecessors, (95), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:11,536 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 179 transitions. [2021-05-06 11:56:11,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-06 11:56:11,536 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:11,536 INFO L523 BasicCegarLoop]: trace histogram [36, 35, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:11,536 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2021-05-06 11:56:11,537 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:11,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:11,537 INFO L82 PathProgramCache]: Analyzing trace with hash -2044888632, now seen corresponding path program 18 times [2021-05-06 11:56:11,537 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:11,537 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [339064722] [2021-05-06 11:56:11,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:11,542 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:11,548 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:11,552 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:11,555 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:11,562 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:11,565 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:11,578 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:11,579 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:11,586 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:11,588 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:11,596 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:11,609 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:11,609 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:11,612 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:11,624 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:11,626 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:11,633 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:11,635 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:11,643 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:11,656 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:11,669 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:11,669 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:11,674 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:11,683 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:11,690 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:11,690 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:11,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:11,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:11,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:11,926 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:11,928 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:12,723 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:12,723 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [339064722] [2021-05-06 11:56:12,723 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [339064722] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:12,723 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:12,723 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [59] imperfect sequences [] total 59 [2021-05-06 11:56:12,723 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558563855] [2021-05-06 11:56:12,724 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-06 11:56:12,724 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:12,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-06 11:56:12,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1113, Invalid=2669, Unknown=0, NotChecked=0, Total=3782 [2021-05-06 11:56:12,724 INFO L87 Difference]: Start difference. First operand 174 states and 179 transitions. Second operand has 59 states, 59 states have (on average 1.6610169491525424) internal successors, (98), 58 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 11:56:15,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:15,949 INFO L93 Difference]: Finished difference Result 273 states and 285 transitions. [2021-05-06 11:56:15,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-06 11:56:15,950 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.6610169491525424) internal successors, (98), 58 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 11:56:15,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:15,950 INFO L225 Difference]: With dead ends: 273 [2021-05-06 11:56:15,950 INFO L226 Difference]: Without dead ends: 177 [2021-05-06 11:56:15,951 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3981 ImplicationChecksByTransitivity, 3026.0ms TimeCoverageRelationStatistics Valid=3162, Invalid=10644, Unknown=0, NotChecked=0, Total=13806 [2021-05-06 11:56:15,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2021-05-06 11:56:15,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 177. [2021-05-06 11:56:15,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 170 states have (on average 1.035294117647059) internal successors, (176), 171 states have internal predecessors, (176), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:56:15,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 182 transitions. [2021-05-06 11:56:15,961 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 182 transitions. Word has length 102 [2021-05-06 11:56:15,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:15,961 INFO L480 AbstractCegarLoop]: Abstraction has 177 states and 182 transitions. [2021-05-06 11:56:15,961 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 1.6610169491525424) internal successors, (98), 58 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 11:56:15,961 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 182 transitions. [2021-05-06 11:56:15,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-06 11:56:15,962 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:15,962 INFO L523 BasicCegarLoop]: trace histogram [37, 36, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:15,962 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2021-05-06 11:56:15,962 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:15,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:15,962 INFO L82 PathProgramCache]: Analyzing trace with hash -1380609610, now seen corresponding path program 19 times [2021-05-06 11:56:15,962 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:15,962 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [191136821] [2021-05-06 11:56:15,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:15,970 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:15,975 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:15,979 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:15,982 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:15,989 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:15,992 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:15,993 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:15,995 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:16,002 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:16,004 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:16,020 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:16,033 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:16,034 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:16,036 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:16,037 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:16,038 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:16,045 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:16,046 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:16,063 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:16,075 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 11:56:16,078 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:16,078 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:16,082 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:16,090 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:16,096 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 11:56:16,097 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:16,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:16,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:16,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:16,335 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:16,336 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:16,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:17,124 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:17,124 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [191136821] [2021-05-06 11:56:17,124 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [191136821] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:17,124 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:17,124 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [61] imperfect sequences [] total 61 [2021-05-06 11:56:17,124 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461618964] [2021-05-06 11:56:17,124 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2021-05-06 11:56:17,124 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:17,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-05-06 11:56:17,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1106, Invalid=2554, Unknown=0, NotChecked=0, Total=3660 [2021-05-06 11:56:17,125 INFO L87 Difference]: Start difference. First operand 177 states and 182 transitions. Second operand has 61 states, 61 states have (on average 1.6557377049180328) internal successors, (101), 60 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 11:56:20,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:20,436 INFO L93 Difference]: Finished difference Result 283 states and 301 transitions. [2021-05-06 11:56:20,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-05-06 11:56:20,438 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.6557377049180328) internal successors, (101), 60 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 11:56:20,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:20,439 INFO L225 Difference]: With dead ends: 283 [2021-05-06 11:56:20,439 INFO L226 Difference]: Without dead ends: 186 [2021-05-06 11:56:20,440 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3894 ImplicationChecksByTransitivity, 3100.0ms TimeCoverageRelationStatistics Valid=3312, Invalid=10730, Unknown=0, NotChecked=0, Total=14042 [2021-05-06 11:56:20,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2021-05-06 11:56:20,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 114. [2021-05-06 11:56:20,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 107 states have (on average 1.0467289719626167) internal successors, (112), 108 states have internal predecessors, (112), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:56:20,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 118 transitions. [2021-05-06 11:56:20,446 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 118 transitions. Word has length 105 [2021-05-06 11:56:20,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:20,446 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 118 transitions. [2021-05-06 11:56:20,447 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 61 states, 61 states have (on average 1.6557377049180328) internal successors, (101), 60 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 11:56:20,447 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 118 transitions. [2021-05-06 11:56:20,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-06 11:56:20,447 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:20,447 INFO L523 BasicCegarLoop]: trace histogram [39, 38, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:20,447 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2021-05-06 11:56:20,447 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:20,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:20,447 INFO L82 PathProgramCache]: Analyzing trace with hash 2123965111, now seen corresponding path program 20 times [2021-05-06 11:56:20,447 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:20,448 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [499374148] [2021-05-06 11:56:20,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:20,453 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:20,453 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:20,457 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:20,466 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:20,473 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:20,477 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:20,490 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:20,491 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:20,499 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:20,501 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:20,509 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:20,525 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:20,526 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:20,530 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:20,543 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:20,545 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:20,553 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:20,555 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:20,563 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:20,576 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:20,578 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:20,579 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:20,582 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:20,590 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:20,597 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:20,598 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:20,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:20,803 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:20,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:20,806 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:20,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:20,808 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:21,676 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:21,676 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [499374148] [2021-05-06 11:56:21,676 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [499374148] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:21,676 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:21,676 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [64] imperfect sequences [] total 64 [2021-05-06 11:56:21,676 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134018652] [2021-05-06 11:56:21,677 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-06 11:56:21,677 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:21,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-06 11:56:21,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1214, Invalid=2818, Unknown=0, NotChecked=0, Total=4032 [2021-05-06 11:56:21,677 INFO L87 Difference]: Start difference. First operand 114 states and 118 transitions. Second operand has 64 states, 64 states have (on average 1.65625) internal successors, (106), 63 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 11:56:25,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:25,317 INFO L93 Difference]: Finished difference Result 225 states and 238 transitions. [2021-05-06 11:56:25,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-05-06 11:56:25,318 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 1.65625) internal successors, (106), 63 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 11:56:25,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:25,318 INFO L225 Difference]: With dead ends: 225 [2021-05-06 11:56:25,318 INFO L226 Difference]: Without dead ends: 119 [2021-05-06 11:56:25,319 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4309 ImplicationChecksByTransitivity, 3337.1ms TimeCoverageRelationStatistics Valid=3636, Invalid=11864, Unknown=0, NotChecked=0, Total=15500 [2021-05-06 11:56:25,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-05-06 11:56:25,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2021-05-06 11:56:25,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 112 states have (on average 1.0446428571428572) internal successors, (117), 113 states have internal predecessors, (117), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:56:25,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 123 transitions. [2021-05-06 11:56:25,325 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 123 transitions. Word has length 110 [2021-05-06 11:56:25,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:25,326 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 123 transitions. [2021-05-06 11:56:25,326 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 64 states, 64 states have (on average 1.65625) internal successors, (106), 63 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 11:56:25,326 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 123 transitions. [2021-05-06 11:56:25,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-05-06 11:56:25,326 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:25,326 INFO L523 BasicCegarLoop]: trace histogram [41, 40, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:25,326 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2021-05-06 11:56:25,326 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:25,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:25,327 INFO L82 PathProgramCache]: Analyzing trace with hash -875783038, now seen corresponding path program 21 times [2021-05-06 11:56:25,327 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:25,327 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [746602842] [2021-05-06 11:56:25,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:25,333 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:25,333 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:25,337 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:25,345 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:25,352 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:25,355 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:25,368 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:25,370 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:25,388 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:25,390 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:25,397 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:25,411 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:25,412 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:25,426 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:25,441 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:25,443 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:25,450 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:25,452 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:25,460 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:25,473 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:25,475 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:25,476 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:25,479 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:25,488 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:25,494 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:25,499 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:25,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:25,719 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:25,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:25,722 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:25,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:25,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:26,711 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:26,711 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [746602842] [2021-05-06 11:56:26,711 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [746602842] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:26,711 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:26,712 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [67] imperfect sequences [] total 67 [2021-05-06 11:56:26,712 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655983318] [2021-05-06 11:56:26,712 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2021-05-06 11:56:26,712 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:26,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-05-06 11:56:26,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1327, Invalid=3095, Unknown=0, NotChecked=0, Total=4422 [2021-05-06 11:56:26,713 INFO L87 Difference]: Start difference. First operand 119 states and 123 transitions. Second operand has 67 states, 67 states have (on average 1.6567164179104477) internal successors, (111), 66 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 11:56:30,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:30,571 INFO L93 Difference]: Finished difference Result 235 states and 248 transitions. [2021-05-06 11:56:30,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-05-06 11:56:30,572 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 1.6567164179104477) internal successors, (111), 66 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 11:56:30,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:30,572 INFO L225 Difference]: With dead ends: 235 [2021-05-06 11:56:30,572 INFO L226 Difference]: Without dead ends: 124 [2021-05-06 11:56:30,573 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4745 ImplicationChecksByTransitivity, 3591.9ms TimeCoverageRelationStatistics Valid=3975, Invalid=13055, Unknown=0, NotChecked=0, Total=17030 [2021-05-06 11:56:30,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-05-06 11:56:30,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2021-05-06 11:56:30,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 117 states have (on average 1.0427350427350428) internal successors, (122), 118 states have internal predecessors, (122), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:56:30,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 128 transitions. [2021-05-06 11:56:30,580 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 128 transitions. Word has length 115 [2021-05-06 11:56:30,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:30,581 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 128 transitions. [2021-05-06 11:56:30,581 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 67 states, 67 states have (on average 1.6567164179104477) internal successors, (111), 66 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 11:56:30,581 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 128 transitions. [2021-05-06 11:56:30,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-05-06 11:56:30,581 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:30,581 INFO L523 BasicCegarLoop]: trace histogram [43, 42, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:30,582 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2021-05-06 11:56:30,582 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:30,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:30,582 INFO L82 PathProgramCache]: Analyzing trace with hash -43565845, now seen corresponding path program 22 times [2021-05-06 11:56:30,582 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:30,582 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1362312782] [2021-05-06 11:56:30,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:30,591 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:30,591 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:30,595 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:30,604 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:30,610 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:30,614 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:30,627 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:30,628 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:30,638 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:30,640 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:30,647 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:30,662 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:30,663 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:30,665 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:30,666 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:30,667 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:30,676 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:30,678 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:30,698 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:30,714 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:30,716 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:30,717 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:30,720 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:30,729 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:30,736 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:30,736 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:30,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:31,017 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:31,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:31,024 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:31,024 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:31,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:32,085 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:32,085 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1362312782] [2021-05-06 11:56:32,085 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1362312782] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:32,085 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:32,085 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [70] imperfect sequences [] total 70 [2021-05-06 11:56:32,085 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845657154] [2021-05-06 11:56:32,086 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2021-05-06 11:56:32,086 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:32,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-05-06 11:56:32,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1445, Invalid=3385, Unknown=0, NotChecked=0, Total=4830 [2021-05-06 11:56:32,086 INFO L87 Difference]: Start difference. First operand 124 states and 128 transitions. Second operand has 70 states, 70 states have (on average 1.6571428571428573) internal successors, (116), 69 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 11:56:36,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:36,319 INFO L93 Difference]: Finished difference Result 245 states and 258 transitions. [2021-05-06 11:56:36,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-05-06 11:56:36,321 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 1.6571428571428573) internal successors, (116), 69 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 11:56:36,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:36,321 INFO L225 Difference]: With dead ends: 245 [2021-05-06 11:56:36,321 INFO L226 Difference]: Without dead ends: 129 [2021-05-06 11:56:36,322 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5202 ImplicationChecksByTransitivity, 3925.2ms TimeCoverageRelationStatistics Valid=4329, Invalid=14303, Unknown=0, NotChecked=0, Total=18632 [2021-05-06 11:56:36,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-05-06 11:56:36,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2021-05-06 11:56:36,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 122 states have (on average 1.040983606557377) internal successors, (127), 123 states have internal predecessors, (127), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:56:36,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 133 transitions. [2021-05-06 11:56:36,329 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 133 transitions. Word has length 120 [2021-05-06 11:56:36,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:36,329 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 133 transitions. [2021-05-06 11:56:36,330 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 70 states, 70 states have (on average 1.6571428571428573) internal successors, (116), 69 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 11:56:36,330 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 133 transitions. [2021-05-06 11:56:36,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-06 11:56:36,330 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:36,330 INFO L523 BasicCegarLoop]: trace histogram [45, 44, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:36,330 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68 [2021-05-06 11:56:36,330 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:36,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:36,330 INFO L82 PathProgramCache]: Analyzing trace with hash 1490103630, now seen corresponding path program 23 times [2021-05-06 11:56:36,331 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:36,331 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [697219538] [2021-05-06 11:56:36,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:36,337 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:36,343 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:36,346 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:36,350 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:36,357 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:36,359 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:36,372 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:36,373 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:36,382 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:36,383 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:36,391 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:36,404 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:36,405 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:36,407 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:36,408 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:36,409 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:36,416 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:36,418 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:36,436 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:36,449 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:36,451 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:36,457 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:36,460 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:36,464 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:36,470 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:36,471 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:36,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:36,715 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:36,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:36,723 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:36,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:36,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:37,871 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:37,871 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [697219538] [2021-05-06 11:56:37,871 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [697219538] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:37,871 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:37,871 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [73] imperfect sequences [] total 73 [2021-05-06 11:56:37,871 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1783291775] [2021-05-06 11:56:37,871 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2021-05-06 11:56:37,871 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:37,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-05-06 11:56:37,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1568, Invalid=3688, Unknown=0, NotChecked=0, Total=5256 [2021-05-06 11:56:37,872 INFO L87 Difference]: Start difference. First operand 129 states and 133 transitions. Second operand has 73 states, 73 states have (on average 1.6575342465753424) internal successors, (121), 72 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 11:56:42,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:42,375 INFO L93 Difference]: Finished difference Result 255 states and 268 transitions. [2021-05-06 11:56:42,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-05-06 11:56:42,376 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 1.6575342465753424) internal successors, (121), 72 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 11:56:42,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:42,377 INFO L225 Difference]: With dead ends: 255 [2021-05-06 11:56:42,377 INFO L226 Difference]: Without dead ends: 134 [2021-05-06 11:56:42,378 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5680 ImplicationChecksByTransitivity, 4172.9ms TimeCoverageRelationStatistics Valid=4698, Invalid=15608, Unknown=0, NotChecked=0, Total=20306 [2021-05-06 11:56:42,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-06 11:56:42,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 134. [2021-05-06 11:56:42,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 127 states have (on average 1.0393700787401574) internal successors, (132), 128 states have internal predecessors, (132), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:56:42,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 138 transitions. [2021-05-06 11:56:42,385 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 138 transitions. Word has length 125 [2021-05-06 11:56:42,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:42,385 INFO L480 AbstractCegarLoop]: Abstraction has 134 states and 138 transitions. [2021-05-06 11:56:42,385 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 73 states, 73 states have (on average 1.6575342465753424) internal successors, (121), 72 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 11:56:42,385 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 138 transitions. [2021-05-06 11:56:42,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-05-06 11:56:42,385 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:42,385 INFO L523 BasicCegarLoop]: trace histogram [47, 46, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:42,385 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71 [2021-05-06 11:56:42,386 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:42,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:42,386 INFO L82 PathProgramCache]: Analyzing trace with hash 1330655519, now seen corresponding path program 24 times [2021-05-06 11:56:42,386 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:42,386 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1486017289] [2021-05-06 11:56:42,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:42,392 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:42,392 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:42,396 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:42,404 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:42,411 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:42,414 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:42,414 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:42,415 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:42,422 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:42,424 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:42,441 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:42,454 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:42,455 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:42,458 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:42,458 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:42,459 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:42,467 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:42,469 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:42,489 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:42,502 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:42,504 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:42,505 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:42,508 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:42,517 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:42,524 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:42,524 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:42,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:42,803 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:42,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:42,807 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:42,808 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:42,809 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:43,993 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:43,993 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1486017289] [2021-05-06 11:56:43,993 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1486017289] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:43,993 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:43,994 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [76] imperfect sequences [] total 76 [2021-05-06 11:56:43,994 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524339625] [2021-05-06 11:56:43,994 INFO L460 AbstractCegarLoop]: Interpolant automaton has 76 states [2021-05-06 11:56:43,994 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:43,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-05-06 11:56:43,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1696, Invalid=4004, Unknown=0, NotChecked=0, Total=5700 [2021-05-06 11:56:43,995 INFO L87 Difference]: Start difference. First operand 134 states and 138 transitions. Second operand has 76 states, 76 states have (on average 1.6578947368421053) internal successors, (126), 75 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 11:56:49,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:49,044 INFO L93 Difference]: Finished difference Result 265 states and 278 transitions. [2021-05-06 11:56:49,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-05-06 11:56:49,044 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 1.6578947368421053) internal successors, (126), 75 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 11:56:49,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:49,045 INFO L225 Difference]: With dead ends: 265 [2021-05-06 11:56:49,045 INFO L226 Difference]: Without dead ends: 139 [2021-05-06 11:56:49,046 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6179 ImplicationChecksByTransitivity, 4498.0ms TimeCoverageRelationStatistics Valid=5082, Invalid=16970, Unknown=0, NotChecked=0, Total=22052 [2021-05-06 11:56:49,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-05-06 11:56:49,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2021-05-06 11:56:49,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 132 states have (on average 1.0378787878787878) internal successors, (137), 133 states have internal predecessors, (137), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:56:49,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 143 transitions. [2021-05-06 11:56:49,053 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 143 transitions. Word has length 130 [2021-05-06 11:56:49,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:49,054 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 143 transitions. [2021-05-06 11:56:49,054 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 76 states, 76 states have (on average 1.6578947368421053) internal successors, (126), 75 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 11:56:49,054 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 143 transitions. [2021-05-06 11:56:49,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-05-06 11:56:49,054 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:49,054 INFO L523 BasicCegarLoop]: trace histogram [49, 48, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:49,054 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74 [2021-05-06 11:56:49,054 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:49,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:49,055 INFO L82 PathProgramCache]: Analyzing trace with hash 931300378, now seen corresponding path program 25 times [2021-05-06 11:56:49,055 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:49,055 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1574628790] [2021-05-06 11:56:49,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:49,061 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:49,066 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:49,070 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:49,074 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:49,080 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:49,085 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:49,098 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:49,100 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:49,107 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:49,109 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:49,117 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:49,130 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:49,131 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:49,133 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:49,134 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:49,135 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:49,143 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:49,144 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:49,163 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:49,181 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:49,184 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:49,189 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:49,195 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:49,200 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:49,207 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:49,207 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:49,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:49,510 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:49,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:49,514 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:49,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:49,515 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:50,805 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:50,805 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1574628790] [2021-05-06 11:56:50,805 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1574628790] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:50,805 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:50,805 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [79] imperfect sequences [] total 79 [2021-05-06 11:56:50,805 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270834923] [2021-05-06 11:56:50,805 INFO L460 AbstractCegarLoop]: Interpolant automaton has 79 states [2021-05-06 11:56:50,805 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:50,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-05-06 11:56:50,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1829, Invalid=4333, Unknown=0, NotChecked=0, Total=6162 [2021-05-06 11:56:50,806 INFO L87 Difference]: Start difference. First operand 139 states and 143 transitions. Second operand has 79 states, 79 states have (on average 1.6582278481012658) internal successors, (131), 78 states have internal predecessors, (131), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:56,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:56,031 INFO L93 Difference]: Finished difference Result 275 states and 288 transitions. [2021-05-06 11:56:56,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-05-06 11:56:56,031 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 1.6582278481012658) internal successors, (131), 78 states have internal predecessors, (131), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 135 [2021-05-06 11:56:56,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:56,032 INFO L225 Difference]: With dead ends: 275 [2021-05-06 11:56:56,032 INFO L226 Difference]: Without dead ends: 144 [2021-05-06 11:56:56,033 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6699 ImplicationChecksByTransitivity, 4850.2ms TimeCoverageRelationStatistics Valid=5481, Invalid=18389, Unknown=0, NotChecked=0, Total=23870 [2021-05-06 11:56:56,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-05-06 11:56:56,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 144. [2021-05-06 11:56:56,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 137 states have (on average 1.0364963503649636) internal successors, (142), 138 states have internal predecessors, (142), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:56:56,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 148 transitions. [2021-05-06 11:56:56,040 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 148 transitions. Word has length 135 [2021-05-06 11:56:56,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:56,040 INFO L480 AbstractCegarLoop]: Abstraction has 144 states and 148 transitions. [2021-05-06 11:56:56,040 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 79 states, 79 states have (on average 1.6582278481012658) internal successors, (131), 78 states have internal predecessors, (131), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:56,040 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 148 transitions. [2021-05-06 11:56:56,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-05-06 11:56:56,041 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:56,041 INFO L523 BasicCegarLoop]: trace histogram [51, 50, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:56,041 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77 [2021-05-06 11:56:56,041 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:56,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:56,041 INFO L82 PathProgramCache]: Analyzing trace with hash -1737179309, now seen corresponding path program 26 times [2021-05-06 11:56:56,041 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:56,041 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [53041802] [2021-05-06 11:56:56,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:56,048 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:56:56,053 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:56,057 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:56,060 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:56:56,067 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:56,072 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:56,088 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:56,089 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:56,097 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:56,099 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:56,107 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:56,121 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:56,122 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:56,133 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:56:56,134 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:56,136 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:56,144 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:56:56,146 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:56:56,167 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:56:56,182 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:56,184 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:56:56,190 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:56,193 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:56:56,197 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:56:56,204 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:56,204 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:56,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:56,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:56:56,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:56:56,552 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:56:56,553 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:56,554 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:56:57,935 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:56:57,935 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [53041802] [2021-05-06 11:56:57,935 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [53041802] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:56:57,936 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:56:57,936 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [82] imperfect sequences [] total 82 [2021-05-06 11:56:57,936 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [658788551] [2021-05-06 11:56:57,936 INFO L460 AbstractCegarLoop]: Interpolant automaton has 82 states [2021-05-06 11:56:57,936 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:56:57,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-05-06 11:56:57,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1967, Invalid=4675, Unknown=0, NotChecked=0, Total=6642 [2021-05-06 11:56:57,937 INFO L87 Difference]: Start difference. First operand 144 states and 148 transitions. Second operand has 82 states, 82 states have (on average 1.6585365853658536) internal successors, (136), 81 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:03,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:03,515 INFO L93 Difference]: Finished difference Result 285 states and 298 transitions. [2021-05-06 11:57:03,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-05-06 11:57:03,517 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 1.6585365853658536) internal successors, (136), 81 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 140 [2021-05-06 11:57:03,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:03,517 INFO L225 Difference]: With dead ends: 285 [2021-05-06 11:57:03,517 INFO L226 Difference]: Without dead ends: 149 [2021-05-06 11:57:03,519 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7240 ImplicationChecksByTransitivity, 5124.9ms TimeCoverageRelationStatistics Valid=5895, Invalid=19865, Unknown=0, NotChecked=0, Total=25760 [2021-05-06 11:57:03,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-06 11:57:03,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2021-05-06 11:57:03,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 142 states have (on average 1.0352112676056338) internal successors, (147), 143 states have internal predecessors, (147), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:57:03,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 153 transitions. [2021-05-06 11:57:03,526 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 153 transitions. Word has length 140 [2021-05-06 11:57:03,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:03,526 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 153 transitions. [2021-05-06 11:57:03,526 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 82 states, 82 states have (on average 1.6585365853658536) internal successors, (136), 81 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:03,526 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 153 transitions. [2021-05-06 11:57:03,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-05-06 11:57:03,527 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:03,527 INFO L523 BasicCegarLoop]: trace histogram [53, 52, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:03,527 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80 [2021-05-06 11:57:03,527 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:03,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:03,527 INFO L82 PathProgramCache]: Analyzing trace with hash -1277173530, now seen corresponding path program 27 times [2021-05-06 11:57:03,527 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:03,527 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [722291131] [2021-05-06 11:57:03,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:03,533 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:03,533 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:03,537 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:03,545 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:03,552 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:03,554 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:03,567 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:03,569 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:03,576 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:03,578 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:03,585 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:03,599 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:03,600 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:03,603 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:03,616 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:03,617 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:03,625 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:03,627 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:03,635 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:03,649 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:03,652 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:03,658 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:03,663 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:03,668 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:03,676 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:03,677 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:03,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:04,039 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:04,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:04,051 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:04,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:04,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:05,552 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:05,552 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [722291131] [2021-05-06 11:57:05,552 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [722291131] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:05,552 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:05,552 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [85] imperfect sequences [] total 85 [2021-05-06 11:57:05,552 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163646440] [2021-05-06 11:57:05,552 INFO L460 AbstractCegarLoop]: Interpolant automaton has 85 states [2021-05-06 11:57:05,552 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:05,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-05-06 11:57:05,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2110, Invalid=5030, Unknown=0, NotChecked=0, Total=7140 [2021-05-06 11:57:05,553 INFO L87 Difference]: Start difference. First operand 149 states and 153 transitions. Second operand has 85 states, 85 states have (on average 1.6588235294117648) internal successors, (141), 84 states have internal predecessors, (141), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:11,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:11,467 INFO L93 Difference]: Finished difference Result 295 states and 308 transitions. [2021-05-06 11:57:11,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-05-06 11:57:11,468 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 85 states have (on average 1.6588235294117648) internal successors, (141), 84 states have internal predecessors, (141), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 145 [2021-05-06 11:57:11,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:11,469 INFO L225 Difference]: With dead ends: 295 [2021-05-06 11:57:11,469 INFO L226 Difference]: Without dead ends: 154 [2021-05-06 11:57:11,470 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7802 ImplicationChecksByTransitivity, 5483.4ms TimeCoverageRelationStatistics Valid=6324, Invalid=21398, Unknown=0, NotChecked=0, Total=27722 [2021-05-06 11:57:11,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-05-06 11:57:11,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 154. [2021-05-06 11:57:11,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 147 states have (on average 1.034013605442177) internal successors, (152), 148 states have internal predecessors, (152), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:57:11,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 158 transitions. [2021-05-06 11:57:11,477 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 158 transitions. Word has length 145 [2021-05-06 11:57:11,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:11,477 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 158 transitions. [2021-05-06 11:57:11,478 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 85 states, 85 states have (on average 1.6588235294117648) internal successors, (141), 84 states have internal predecessors, (141), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:11,478 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 158 transitions. [2021-05-06 11:57:11,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2021-05-06 11:57:11,478 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:11,478 INFO L523 BasicCegarLoop]: trace histogram [55, 54, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:11,478 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83 [2021-05-06 11:57:11,478 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:11,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:11,479 INFO L82 PathProgramCache]: Analyzing trace with hash 1706403719, now seen corresponding path program 28 times [2021-05-06 11:57:11,479 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:11,479 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1806060110] [2021-05-06 11:57:11,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:11,487 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:11,492 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:11,495 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:11,499 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:11,505 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:11,508 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:11,508 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:11,509 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:11,517 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:11,518 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:11,536 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:11,549 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:11,550 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:11,552 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:11,553 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:11,555 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:11,562 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:11,564 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:11,582 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:11,595 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:11,597 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:11,597 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:11,601 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:11,609 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:11,616 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:11,616 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:11,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:11,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:11,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:12,001 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:12,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:12,002 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:13,592 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:13,592 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1806060110] [2021-05-06 11:57:13,592 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1806060110] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:13,592 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:13,593 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [88] imperfect sequences [] total 88 [2021-05-06 11:57:13,593 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239379659] [2021-05-06 11:57:13,593 INFO L460 AbstractCegarLoop]: Interpolant automaton has 88 states [2021-05-06 11:57:13,593 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:13,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2021-05-06 11:57:13,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2258, Invalid=5398, Unknown=0, NotChecked=0, Total=7656 [2021-05-06 11:57:13,594 INFO L87 Difference]: Start difference. First operand 154 states and 158 transitions. Second operand has 88 states, 88 states have (on average 1.6590909090909092) internal successors, (146), 87 states have internal predecessors, (146), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:19,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:19,873 INFO L93 Difference]: Finished difference Result 305 states and 318 transitions. [2021-05-06 11:57:19,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2021-05-06 11:57:19,873 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 1.6590909090909092) internal successors, (146), 87 states have internal predecessors, (146), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 150 [2021-05-06 11:57:19,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:19,874 INFO L225 Difference]: With dead ends: 305 [2021-05-06 11:57:19,874 INFO L226 Difference]: Without dead ends: 159 [2021-05-06 11:57:19,875 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8385 ImplicationChecksByTransitivity, 5821.0ms TimeCoverageRelationStatistics Valid=6768, Invalid=22988, Unknown=0, NotChecked=0, Total=29756 [2021-05-06 11:57:19,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-05-06 11:57:19,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2021-05-06 11:57:19,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 152 states have (on average 1.0328947368421053) internal successors, (157), 153 states have internal predecessors, (157), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:57:19,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 163 transitions. [2021-05-06 11:57:19,883 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 163 transitions. Word has length 150 [2021-05-06 11:57:19,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:19,883 INFO L480 AbstractCegarLoop]: Abstraction has 159 states and 163 transitions. [2021-05-06 11:57:19,884 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 88 states, 88 states have (on average 1.6590909090909092) internal successors, (146), 87 states have internal predecessors, (146), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:19,884 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 163 transitions. [2021-05-06 11:57:19,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-05-06 11:57:19,884 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:19,884 INFO L523 BasicCegarLoop]: trace histogram [57, 56, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:19,884 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86 [2021-05-06 11:57:19,884 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:19,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:19,885 INFO L82 PathProgramCache]: Analyzing trace with hash 1596490674, now seen corresponding path program 29 times [2021-05-06 11:57:19,885 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:19,885 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [602915077] [2021-05-06 11:57:19,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:19,897 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:19,902 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:19,905 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:19,908 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:19,915 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:19,917 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:19,934 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:19,936 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:19,943 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:19,945 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:19,953 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:19,966 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:19,967 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:19,969 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:19,970 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:19,971 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:19,979 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:19,981 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:19,999 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:20,012 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:20,015 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:20,015 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:20,019 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:20,027 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:20,034 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:20,034 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:20,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:20,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:20,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:20,437 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:20,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:20,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:22,102 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:22,103 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [602915077] [2021-05-06 11:57:22,103 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [602915077] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:22,103 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:22,103 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [91] imperfect sequences [] total 91 [2021-05-06 11:57:22,103 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53843105] [2021-05-06 11:57:22,103 INFO L460 AbstractCegarLoop]: Interpolant automaton has 91 states [2021-05-06 11:57:22,103 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:22,104 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2021-05-06 11:57:22,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2411, Invalid=5779, Unknown=0, NotChecked=0, Total=8190 [2021-05-06 11:57:22,104 INFO L87 Difference]: Start difference. First operand 159 states and 163 transitions. Second operand has 91 states, 91 states have (on average 1.6593406593406594) internal successors, (151), 90 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:28,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:28,845 INFO L93 Difference]: Finished difference Result 315 states and 328 transitions. [2021-05-06 11:57:28,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2021-05-06 11:57:28,845 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 1.6593406593406594) internal successors, (151), 90 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 155 [2021-05-06 11:57:28,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:28,846 INFO L225 Difference]: With dead ends: 315 [2021-05-06 11:57:28,846 INFO L226 Difference]: Without dead ends: 164 [2021-05-06 11:57:28,847 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8989 ImplicationChecksByTransitivity, 6173.2ms TimeCoverageRelationStatistics Valid=7227, Invalid=24635, Unknown=0, NotChecked=0, Total=31862 [2021-05-06 11:57:28,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-05-06 11:57:28,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 164. [2021-05-06 11:57:28,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 157 states have (on average 1.0318471337579618) internal successors, (162), 158 states have internal predecessors, (162), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:57:28,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 168 transitions. [2021-05-06 11:57:28,855 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 168 transitions. Word has length 155 [2021-05-06 11:57:28,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:28,856 INFO L480 AbstractCegarLoop]: Abstraction has 164 states and 168 transitions. [2021-05-06 11:57:28,856 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 91 states, 91 states have (on average 1.6593406593406594) internal successors, (151), 90 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:28,856 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 168 transitions. [2021-05-06 11:57:28,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-05-06 11:57:28,856 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:28,856 INFO L523 BasicCegarLoop]: trace histogram [59, 58, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:28,857 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable89 [2021-05-06 11:57:28,857 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:28,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:28,857 INFO L82 PathProgramCache]: Analyzing trace with hash -793531973, now seen corresponding path program 30 times [2021-05-06 11:57:28,857 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:28,857 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [832023622] [2021-05-06 11:57:28,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:28,863 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:28,863 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:28,866 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:28,874 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:28,881 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:28,884 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:28,900 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:28,902 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:28,908 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:28,910 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:28,918 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:28,931 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:28,932 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:28,934 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:28,934 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:28,936 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:28,943 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:28,945 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:28,963 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:28,976 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:28,978 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:28,979 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:28,982 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:28,991 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:28,998 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:28,998 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:29,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:29,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:29,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:29,437 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:29,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:29,439 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:31,316 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:31,317 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [832023622] [2021-05-06 11:57:31,317 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [832023622] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:31,317 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:31,317 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [94] imperfect sequences [] total 94 [2021-05-06 11:57:31,317 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [102394599] [2021-05-06 11:57:31,331 INFO L460 AbstractCegarLoop]: Interpolant automaton has 94 states [2021-05-06 11:57:31,331 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:31,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2021-05-06 11:57:31,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2569, Invalid=6173, Unknown=0, NotChecked=0, Total=8742 [2021-05-06 11:57:31,332 INFO L87 Difference]: Start difference. First operand 164 states and 168 transitions. Second operand has 94 states, 94 states have (on average 1.6595744680851063) internal successors, (156), 93 states have internal predecessors, (156), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:38,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:38,546 INFO L93 Difference]: Finished difference Result 325 states and 338 transitions. [2021-05-06 11:57:38,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2021-05-06 11:57:38,546 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 1.6595744680851063) internal successors, (156), 93 states have internal predecessors, (156), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 160 [2021-05-06 11:57:38,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:38,547 INFO L225 Difference]: With dead ends: 325 [2021-05-06 11:57:38,547 INFO L226 Difference]: Without dead ends: 169 [2021-05-06 11:57:38,548 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9614 ImplicationChecksByTransitivity, 6723.5ms TimeCoverageRelationStatistics Valid=7701, Invalid=26339, Unknown=0, NotChecked=0, Total=34040 [2021-05-06 11:57:38,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-05-06 11:57:38,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2021-05-06 11:57:38,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 162 states have (on average 1.0308641975308641) internal successors, (167), 163 states have internal predecessors, (167), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:57:38,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 173 transitions. [2021-05-06 11:57:38,557 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 173 transitions. Word has length 160 [2021-05-06 11:57:38,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:38,557 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 173 transitions. [2021-05-06 11:57:38,557 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 94 states, 94 states have (on average 1.6595744680851063) internal successors, (156), 93 states have internal predecessors, (156), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:38,557 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 173 transitions. [2021-05-06 11:57:38,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2021-05-06 11:57:38,558 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:38,558 INFO L523 BasicCegarLoop]: trace histogram [61, 60, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:38,558 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92 [2021-05-06 11:57:38,558 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:38,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:38,558 INFO L82 PathProgramCache]: Analyzing trace with hash -337924994, now seen corresponding path program 31 times [2021-05-06 11:57:38,558 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:38,558 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [860423778] [2021-05-06 11:57:38,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:38,563 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:38,564 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:38,567 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:38,576 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:38,583 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:38,586 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:38,600 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:38,601 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:38,608 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:38,610 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:38,618 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:38,631 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:38,632 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:38,634 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:38,635 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:38,637 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:38,646 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:38,647 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:38,665 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:38,679 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:38,681 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:38,682 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:38,685 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:38,693 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:38,700 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:38,701 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:38,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:39,244 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:39,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:39,257 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:39,258 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:41,180 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:41,180 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [860423778] [2021-05-06 11:57:41,180 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [860423778] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:41,180 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:41,180 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [97] imperfect sequences [] total 97 [2021-05-06 11:57:41,180 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [438289117] [2021-05-06 11:57:41,181 INFO L460 AbstractCegarLoop]: Interpolant automaton has 97 states [2021-05-06 11:57:41,181 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:41,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-05-06 11:57:41,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2871, Invalid=7029, Unknown=0, NotChecked=0, Total=9900 [2021-05-06 11:57:41,182 INFO L87 Difference]: Start difference. First operand 169 states and 173 transitions. Second operand has 97 states, 97 states have (on average 1.6597938144329898) internal successors, (161), 96 states have internal predecessors, (161), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:49,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:49,016 INFO L93 Difference]: Finished difference Result 453 states and 466 transitions. [2021-05-06 11:57:49,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2021-05-06 11:57:49,016 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 1.6597938144329898) internal successors, (161), 96 states have internal predecessors, (161), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 165 [2021-05-06 11:57:49,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:49,017 INFO L225 Difference]: With dead ends: 453 [2021-05-06 11:57:49,017 INFO L226 Difference]: Without dead ends: 292 [2021-05-06 11:57:49,018 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10883 ImplicationChecksByTransitivity, 7068.3ms TimeCoverageRelationStatistics Valid=8334, Invalid=29108, Unknown=0, NotChecked=0, Total=37442 [2021-05-06 11:57:49,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2021-05-06 11:57:49,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 292. [2021-05-06 11:57:49,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 285 states have (on average 1.0210526315789474) internal successors, (291), 286 states have internal predecessors, (291), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:57:49,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 297 transitions. [2021-05-06 11:57:49,033 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 297 transitions. Word has length 165 [2021-05-06 11:57:49,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:49,033 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 297 transitions. [2021-05-06 11:57:49,033 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 97 states, 97 states have (on average 1.6597938144329898) internal successors, (161), 96 states have internal predecessors, (161), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:49,033 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 297 transitions. [2021-05-06 11:57:49,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2021-05-06 11:57:49,033 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:49,034 INFO L523 BasicCegarLoop]: trace histogram [62, 61, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:49,034 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95 [2021-05-06 11:57:49,034 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:49,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:49,034 INFO L82 PathProgramCache]: Analyzing trace with hash 444006698, now seen corresponding path program 32 times [2021-05-06 11:57:49,034 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:49,034 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [716421020] [2021-05-06 11:57:49,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:49,039 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:49,044 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:49,048 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:49,051 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:49,057 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:49,060 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:49,072 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:49,073 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:49,079 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:49,081 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:49,089 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:49,103 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:49,104 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:49,106 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:49,119 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:49,120 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:49,127 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:49,129 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:49,137 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:49,150 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 11:57:49,153 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:49,153 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:49,157 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:49,166 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:49,173 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:49,173 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:49,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:49,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:49,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:49,639 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:49,640 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:49,641 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:51,576 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:51,576 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [716421020] [2021-05-06 11:57:51,576 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [716421020] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:51,576 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:51,576 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [99] imperfect sequences [] total 99 [2021-05-06 11:57:51,576 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820778173] [2021-05-06 11:57:51,576 INFO L460 AbstractCegarLoop]: Interpolant automaton has 99 states [2021-05-06 11:57:51,576 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:51,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2021-05-06 11:57:51,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2864, Invalid=6838, Unknown=0, NotChecked=0, Total=9702 [2021-05-06 11:57:51,577 INFO L87 Difference]: Start difference. First operand 292 states and 297 transitions. Second operand has 99 states, 99 states have (on average 1.6565656565656566) internal successors, (164), 98 states have internal predecessors, (164), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:59,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:59,436 INFO L93 Difference]: Finished difference Result 461 states and 477 transitions. [2021-05-06 11:57:59,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2021-05-06 11:57:59,437 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 99 states have (on average 1.6565656565656566) internal successors, (164), 98 states have internal predecessors, (164), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 168 [2021-05-06 11:57:59,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:59,437 INFO L225 Difference]: With dead ends: 461 [2021-05-06 11:57:59,438 INFO L226 Difference]: Without dead ends: 299 [2021-05-06 11:57:59,439 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10734 ImplicationChecksByTransitivity, 7202.6ms TimeCoverageRelationStatistics Valid=8586, Invalid=29244, Unknown=0, NotChecked=0, Total=37830 [2021-05-06 11:57:59,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2021-05-06 11:57:59,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 177. [2021-05-06 11:57:59,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 170 states have (on average 1.0294117647058822) internal successors, (175), 171 states have internal predecessors, (175), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:57:59,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 181 transitions. [2021-05-06 11:57:59,448 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 181 transitions. Word has length 168 [2021-05-06 11:57:59,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:59,448 INFO L480 AbstractCegarLoop]: Abstraction has 177 states and 181 transitions. [2021-05-06 11:57:59,448 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 99 states, 99 states have (on average 1.6565656565656566) internal successors, (164), 98 states have internal predecessors, (164), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:59,448 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 181 transitions. [2021-05-06 11:57:59,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-05-06 11:57:59,449 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:59,449 INFO L523 BasicCegarLoop]: trace histogram [64, 63, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:59,449 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable98 [2021-05-06 11:57:59,449 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:59,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:59,449 INFO L82 PathProgramCache]: Analyzing trace with hash -332141329, now seen corresponding path program 33 times [2021-05-06 11:57:59,450 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:59,450 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [896223257] [2021-05-06 11:57:59,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:59,454 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:57:59,455 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:59,458 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:59,467 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:57:59,473 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:59,477 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:59,490 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:59,491 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:59,498 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:59,500 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:59,508 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:59,522 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:59,523 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:59,526 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:57:59,527 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:59,528 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:59,536 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:57:59,537 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:57:59,557 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:57:59,570 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:59,573 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:57:59,578 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:59,582 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:57:59,585 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:57:59,592 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:59,593 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:59,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:00,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:00,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:00,087 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:58:00,088 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:00,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:02,139 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:02,139 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [896223257] [2021-05-06 11:58:02,139 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [896223257] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:02,139 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:02,139 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [102] imperfect sequences [] total 102 [2021-05-06 11:58:02,139 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447016640] [2021-05-06 11:58:02,140 INFO L460 AbstractCegarLoop]: Interpolant automaton has 102 states [2021-05-06 11:58:02,140 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:02,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2021-05-06 11:58:02,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3036, Invalid=7266, Unknown=0, NotChecked=0, Total=10302 [2021-05-06 11:58:02,141 INFO L87 Difference]: Start difference. First operand 177 states and 181 transitions. Second operand has 102 states, 102 states have (on average 1.6568627450980393) internal successors, (169), 101 states have internal predecessors, (169), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:10,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:10,426 INFO L93 Difference]: Finished difference Result 351 states and 364 transitions. [2021-05-06 11:58:10,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2021-05-06 11:58:10,426 INFO L78 Accepts]: Start accepts. Automaton has has 102 states, 102 states have (on average 1.6568627450980393) internal successors, (169), 101 states have internal predecessors, (169), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 173 [2021-05-06 11:58:10,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:10,427 INFO L225 Difference]: With dead ends: 351 [2021-05-06 11:58:10,427 INFO L226 Difference]: Without dead ends: 182 [2021-05-06 11:58:10,428 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 199 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11416 ImplicationChecksByTransitivity, 7588.3ms TimeCoverageRelationStatistics Valid=9102, Invalid=31098, Unknown=0, NotChecked=0, Total=40200 [2021-05-06 11:58:10,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-05-06 11:58:10,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 182. [2021-05-06 11:58:10,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 175 states have (on average 1.0285714285714285) internal successors, (180), 176 states have internal predecessors, (180), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:58:10,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 186 transitions. [2021-05-06 11:58:10,437 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 186 transitions. Word has length 173 [2021-05-06 11:58:10,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:10,437 INFO L480 AbstractCegarLoop]: Abstraction has 182 states and 186 transitions. [2021-05-06 11:58:10,437 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 102 states, 102 states have (on average 1.6568627450980393) internal successors, (169), 101 states have internal predecessors, (169), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:10,437 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 186 transitions. [2021-05-06 11:58:10,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2021-05-06 11:58:10,438 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:10,438 INFO L523 BasicCegarLoop]: trace histogram [66, 65, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:10,438 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable101 [2021-05-06 11:58:10,438 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:10,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:10,438 INFO L82 PathProgramCache]: Analyzing trace with hash 1118366110, now seen corresponding path program 34 times [2021-05-06 11:58:10,438 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:10,438 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [530279359] [2021-05-06 11:58:10,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:10,449 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:10,455 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:10,458 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:10,462 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:10,468 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 11:58:10,471 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:10,472 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:10,473 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:10,480 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:10,482 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:10,500 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:10,513 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:10,514 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:10,516 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:10,529 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:10,530 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:10,536 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:10,538 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:10,546 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:10,559 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:10,561 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:10,567 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:10,570 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:10,574 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:10,581 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:10,581 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:10,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:11,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:11,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:11,090 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:58:11,091 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:11,092 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:13,250 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:13,251 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [530279359] [2021-05-06 11:58:13,251 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [530279359] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:13,251 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:13,251 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [105] imperfect sequences [] total 105 [2021-05-06 11:58:13,251 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276021180] [2021-05-06 11:58:13,251 INFO L460 AbstractCegarLoop]: Interpolant automaton has 105 states [2021-05-06 11:58:13,251 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:13,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2021-05-06 11:58:13,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3213, Invalid=7707, Unknown=0, NotChecked=0, Total=10920 [2021-05-06 11:58:13,252 INFO L87 Difference]: Start difference. First operand 182 states and 186 transitions. Second operand has 105 states, 105 states have (on average 1.6571428571428573) internal successors, (174), 104 states have internal predecessors, (174), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:22,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:22,200 INFO L93 Difference]: Finished difference Result 361 states and 374 transitions. [2021-05-06 11:58:22,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2021-05-06 11:58:22,200 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 105 states have (on average 1.6571428571428573) internal successors, (174), 104 states have internal predecessors, (174), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 178 [2021-05-06 11:58:22,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:22,201 INFO L225 Difference]: With dead ends: 361 [2021-05-06 11:58:22,201 INFO L226 Difference]: Without dead ends: 187 [2021-05-06 11:58:22,202 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12119 ImplicationChecksByTransitivity, 8020.1ms TimeCoverageRelationStatistics Valid=9633, Invalid=33009, Unknown=0, NotChecked=0, Total=42642 [2021-05-06 11:58:22,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-05-06 11:58:22,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2021-05-06 11:58:22,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 180 states have (on average 1.0277777777777777) internal successors, (185), 181 states have internal predecessors, (185), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:58:22,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 191 transitions. [2021-05-06 11:58:22,211 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 191 transitions. Word has length 178 [2021-05-06 11:58:22,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:22,211 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 191 transitions. [2021-05-06 11:58:22,211 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 105 states, 105 states have (on average 1.6571428571428573) internal successors, (174), 104 states have internal predecessors, (174), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:22,211 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 191 transitions. [2021-05-06 11:58:22,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2021-05-06 11:58:22,212 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:22,212 INFO L523 BasicCegarLoop]: trace histogram [68, 67, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:22,212 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable104 [2021-05-06 11:58:22,212 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:22,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:22,212 INFO L82 PathProgramCache]: Analyzing trace with hash -630204549, now seen corresponding path program 35 times [2021-05-06 11:58:22,212 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:22,213 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [7003900] [2021-05-06 11:58:22,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:22,218 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:22,224 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:22,227 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:22,231 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:22,237 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:22,240 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:22,252 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:22,253 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:22,261 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:22,263 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:22,271 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:22,284 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:22,285 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:22,292 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:22,293 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:22,294 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:22,301 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:22,303 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:22,323 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:22,337 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:22,339 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:22,345 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:22,349 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:22,353 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:22,360 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:22,361 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:22,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:22,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:22,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:22,899 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:58:22,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:22,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:25,180 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:25,180 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [7003900] [2021-05-06 11:58:25,180 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [7003900] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:25,180 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:25,180 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [108] imperfect sequences [] total 108 [2021-05-06 11:58:25,180 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374757279] [2021-05-06 11:58:25,180 INFO L460 AbstractCegarLoop]: Interpolant automaton has 108 states [2021-05-06 11:58:25,180 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:25,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2021-05-06 11:58:25,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3395, Invalid=8161, Unknown=0, NotChecked=0, Total=11556 [2021-05-06 11:58:25,181 INFO L87 Difference]: Start difference. First operand 187 states and 191 transitions. Second operand has 108 states, 108 states have (on average 1.6574074074074074) internal successors, (179), 107 states have internal predecessors, (179), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:34,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:34,425 INFO L93 Difference]: Finished difference Result 371 states and 384 transitions. [2021-05-06 11:58:34,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2021-05-06 11:58:34,426 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 108 states have (on average 1.6574074074074074) internal successors, (179), 107 states have internal predecessors, (179), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 183 [2021-05-06 11:58:34,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:34,426 INFO L225 Difference]: With dead ends: 371 [2021-05-06 11:58:34,426 INFO L226 Difference]: Without dead ends: 192 [2021-05-06 11:58:34,428 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 75 SyntacticMatches, 1 SemanticMatches, 211 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12843 ImplicationChecksByTransitivity, 8431.9ms TimeCoverageRelationStatistics Valid=10179, Invalid=34977, Unknown=0, NotChecked=0, Total=45156 [2021-05-06 11:58:34,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2021-05-06 11:58:34,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 192. [2021-05-06 11:58:34,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 185 states have (on average 1.027027027027027) internal successors, (190), 186 states have internal predecessors, (190), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:58:34,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 196 transitions. [2021-05-06 11:58:34,437 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 196 transitions. Word has length 183 [2021-05-06 11:58:34,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:34,437 INFO L480 AbstractCegarLoop]: Abstraction has 192 states and 196 transitions. [2021-05-06 11:58:34,437 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 108 states, 108 states have (on average 1.6574074074074074) internal successors, (179), 107 states have internal predecessors, (179), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:34,438 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 196 transitions. [2021-05-06 11:58:34,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2021-05-06 11:58:34,438 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:34,438 INFO L523 BasicCegarLoop]: trace histogram [70, 69, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:34,438 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable107 [2021-05-06 11:58:34,438 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:34,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:34,439 INFO L82 PathProgramCache]: Analyzing trace with hash -100639726, now seen corresponding path program 36 times [2021-05-06 11:58:34,439 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:34,439 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [390948304] [2021-05-06 11:58:34,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:34,444 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:34,444 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:34,448 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:34,459 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:34,466 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:34,471 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:34,472 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:34,473 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:34,480 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:34,482 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:34,501 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:34,515 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:34,516 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:34,518 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:34,531 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:34,532 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:34,539 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:34,541 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:34,549 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:34,562 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:34,564 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:34,565 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:34,568 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:34,577 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:34,584 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:34,584 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:34,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:35,189 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:35,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:35,201 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:58:35,202 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:35,203 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:37,596 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:37,597 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [390948304] [2021-05-06 11:58:37,597 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [390948304] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:37,597 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:37,597 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [111] imperfect sequences [] total 111 [2021-05-06 11:58:37,597 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740244262] [2021-05-06 11:58:37,597 INFO L460 AbstractCegarLoop]: Interpolant automaton has 111 states [2021-05-06 11:58:37,597 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:37,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2021-05-06 11:58:37,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3582, Invalid=8628, Unknown=0, NotChecked=0, Total=12210 [2021-05-06 11:58:37,598 INFO L87 Difference]: Start difference. First operand 192 states and 196 transitions. Second operand has 111 states, 111 states have (on average 1.6576576576576576) internal successors, (184), 110 states have internal predecessors, (184), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:47,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:47,271 INFO L93 Difference]: Finished difference Result 381 states and 394 transitions. [2021-05-06 11:58:47,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2021-05-06 11:58:47,271 INFO L78 Accepts]: Start accepts. Automaton has has 111 states, 111 states have (on average 1.6576576576576576) internal successors, (184), 110 states have internal predecessors, (184), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 188 [2021-05-06 11:58:47,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:47,272 INFO L225 Difference]: With dead ends: 381 [2021-05-06 11:58:47,272 INFO L226 Difference]: Without dead ends: 197 [2021-05-06 11:58:47,274 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 217 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13588 ImplicationChecksByTransitivity, 8885.1ms TimeCoverageRelationStatistics Valid=10740, Invalid=37002, Unknown=0, NotChecked=0, Total=47742 [2021-05-06 11:58:47,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-05-06 11:58:47,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 197. [2021-05-06 11:58:47,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 190 states have (on average 1.0263157894736843) internal successors, (195), 191 states have internal predecessors, (195), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:58:47,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 201 transitions. [2021-05-06 11:58:47,283 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 201 transitions. Word has length 188 [2021-05-06 11:58:47,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:47,283 INFO L480 AbstractCegarLoop]: Abstraction has 197 states and 201 transitions. [2021-05-06 11:58:47,283 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 111 states, 111 states have (on average 1.6576576576576576) internal successors, (184), 110 states have internal predecessors, (184), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:47,283 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 201 transitions. [2021-05-06 11:58:47,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2021-05-06 11:58:47,284 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:47,284 INFO L523 BasicCegarLoop]: trace histogram [72, 71, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:47,284 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable110 [2021-05-06 11:58:47,284 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:47,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:47,284 INFO L82 PathProgramCache]: Analyzing trace with hash 762042375, now seen corresponding path program 37 times [2021-05-06 11:58:47,284 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:47,284 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1518098518] [2021-05-06 11:58:47,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:47,291 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:58:47,291 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:47,295 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:47,303 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:58:47,310 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:47,313 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:47,314 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:47,315 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:47,322 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:47,324 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:47,342 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:47,355 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:47,356 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:47,358 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:58:47,371 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:47,372 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:47,379 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:58:47,381 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:58:47,389 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:58:47,402 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:47,404 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:58:47,405 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:47,408 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:58:47,417 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:58:47,423 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 11:58:47,424 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:47,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:48,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:48,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:48,003 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:58:48,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:48,005 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:50,523 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:50,524 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1518098518] [2021-05-06 11:58:50,524 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1518098518] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:50,524 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:50,524 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [114] imperfect sequences [] total 114 [2021-05-06 11:58:50,524 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186974652] [2021-05-06 11:58:50,524 INFO L460 AbstractCegarLoop]: Interpolant automaton has 114 states [2021-05-06 11:58:50,524 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:50,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2021-05-06 11:58:50,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3774, Invalid=9108, Unknown=0, NotChecked=0, Total=12882 [2021-05-06 11:58:50,525 INFO L87 Difference]: Start difference. First operand 197 states and 201 transitions. Second operand has 114 states, 114 states have (on average 1.6578947368421053) internal successors, (189), 113 states have internal predecessors, (189), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:00,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:00,908 INFO L93 Difference]: Finished difference Result 391 states and 404 transitions. [2021-05-06 11:59:00,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2021-05-06 11:59:00,909 INFO L78 Accepts]: Start accepts. Automaton has has 114 states, 114 states have (on average 1.6578947368421053) internal successors, (189), 113 states have internal predecessors, (189), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 193 [2021-05-06 11:59:00,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:00,910 INFO L225 Difference]: With dead ends: 391 [2021-05-06 11:59:00,910 INFO L226 Difference]: Without dead ends: 202 [2021-05-06 11:59:00,911 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 223 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14317 ImplicationChecksByTransitivity, 9287.4ms TimeCoverageRelationStatistics Valid=11316, Invalid=39084, Unknown=0, NotChecked=0, Total=50400 [2021-05-06 11:59:00,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2021-05-06 11:59:00,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 202. [2021-05-06 11:59:00,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 195 states have (on average 1.0256410256410255) internal successors, (200), 196 states have internal predecessors, (200), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:59:00,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 206 transitions. [2021-05-06 11:59:00,921 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 206 transitions. Word has length 193 [2021-05-06 11:59:00,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:00,921 INFO L480 AbstractCegarLoop]: Abstraction has 202 states and 206 transitions. [2021-05-06 11:59:00,921 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 114 states, 114 states have (on average 1.6578947368421053) internal successors, (189), 113 states have internal predecessors, (189), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:00,921 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 206 transitions. [2021-05-06 11:59:00,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2021-05-06 11:59:00,922 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:00,922 INFO L523 BasicCegarLoop]: trace histogram [74, 73, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:00,922 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable113 [2021-05-06 11:59:00,922 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:00,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:00,922 INFO L82 PathProgramCache]: Analyzing trace with hash 119675014, now seen corresponding path program 38 times [2021-05-06 11:59:00,922 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:00,922 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1360763937] [2021-05-06 11:59:00,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:00,941 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:00,941 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:00,945 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:00,953 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:00,960 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:00,963 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:00,976 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:00,983 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:00,989 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:00,991 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:00,999 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:01,012 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:01,013 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:01,015 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:01,027 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:01,033 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:01,042 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:01,044 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:01,053 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:01,069 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:01,071 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:01,077 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:01,080 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:01,084 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:01,091 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:01,091 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:01,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:01,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:01,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:01,724 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:59:01,725 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:01,726 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:04,397 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:04,397 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1360763937] [2021-05-06 11:59:04,397 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1360763937] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:04,397 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:04,397 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [117] imperfect sequences [] total 117 [2021-05-06 11:59:04,398 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [201230038] [2021-05-06 11:59:04,398 INFO L460 AbstractCegarLoop]: Interpolant automaton has 117 states [2021-05-06 11:59:04,398 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:04,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 117 interpolants. [2021-05-06 11:59:04,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3971, Invalid=9601, Unknown=0, NotChecked=0, Total=13572 [2021-05-06 11:59:04,399 INFO L87 Difference]: Start difference. First operand 202 states and 206 transitions. Second operand has 117 states, 117 states have (on average 1.6581196581196582) internal successors, (194), 116 states have internal predecessors, (194), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:15,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:15,257 INFO L93 Difference]: Finished difference Result 401 states and 414 transitions. [2021-05-06 11:59:15,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2021-05-06 11:59:15,257 INFO L78 Accepts]: Start accepts. Automaton has has 117 states, 117 states have (on average 1.6581196581196582) internal successors, (194), 116 states have internal predecessors, (194), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 198 [2021-05-06 11:59:15,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:15,258 INFO L225 Difference]: With dead ends: 401 [2021-05-06 11:59:15,258 INFO L226 Difference]: Without dead ends: 207 [2021-05-06 11:59:15,260 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 311 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 229 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15141 ImplicationChecksByTransitivity, 9780.9ms TimeCoverageRelationStatistics Valid=11907, Invalid=41223, Unknown=0, NotChecked=0, Total=53130 [2021-05-06 11:59:15,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2021-05-06 11:59:15,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 207. [2021-05-06 11:59:15,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 200 states have (on average 1.025) internal successors, (205), 201 states have internal predecessors, (205), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:59:15,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 211 transitions. [2021-05-06 11:59:15,270 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 211 transitions. Word has length 198 [2021-05-06 11:59:15,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:15,270 INFO L480 AbstractCegarLoop]: Abstraction has 207 states and 211 transitions. [2021-05-06 11:59:15,270 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 117 states, 117 states have (on average 1.6581196581196582) internal successors, (194), 116 states have internal predecessors, (194), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:15,270 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 211 transitions. [2021-05-06 11:59:15,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2021-05-06 11:59:15,271 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:15,271 INFO L523 BasicCegarLoop]: trace histogram [76, 75, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:15,271 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable116 [2021-05-06 11:59:15,271 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:15,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:15,271 INFO L82 PathProgramCache]: Analyzing trace with hash 1159933587, now seen corresponding path program 39 times [2021-05-06 11:59:15,271 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:15,271 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1642955739] [2021-05-06 11:59:15,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:15,280 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:15,281 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:15,284 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:15,293 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:15,299 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:15,302 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:15,317 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:15,318 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:15,326 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:15,328 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:15,335 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:15,349 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:15,350 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:15,352 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:15,352 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:15,353 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:15,360 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:15,362 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:15,383 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:15,396 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:15,400 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:15,400 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:15,404 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:15,412 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:15,419 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:15,420 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:15,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:16,050 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:16,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:16,052 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:59:16,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:16,054 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:18,830 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:18,830 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1642955739] [2021-05-06 11:59:18,830 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1642955739] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:18,830 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:18,830 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [120] imperfect sequences [] total 120 [2021-05-06 11:59:18,831 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1005625131] [2021-05-06 11:59:18,831 INFO L460 AbstractCegarLoop]: Interpolant automaton has 120 states [2021-05-06 11:59:18,831 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:18,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2021-05-06 11:59:18,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4173, Invalid=10107, Unknown=0, NotChecked=0, Total=14280 [2021-05-06 11:59:18,832 INFO L87 Difference]: Start difference. First operand 207 states and 211 transitions. Second operand has 120 states, 120 states have (on average 1.6583333333333334) internal successors, (199), 119 states have internal predecessors, (199), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:30,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:30,519 INFO L93 Difference]: Finished difference Result 411 states and 424 transitions. [2021-05-06 11:59:30,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2021-05-06 11:59:30,519 INFO L78 Accepts]: Start accepts. Automaton has has 120 states, 120 states have (on average 1.6583333333333334) internal successors, (199), 119 states have internal predecessors, (199), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 203 [2021-05-06 11:59:30,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:30,520 INFO L225 Difference]: With dead ends: 411 [2021-05-06 11:59:30,520 INFO L226 Difference]: Without dead ends: 212 [2021-05-06 11:59:30,522 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 235 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15949 ImplicationChecksByTransitivity, 10291.8ms TimeCoverageRelationStatistics Valid=12513, Invalid=43419, Unknown=0, NotChecked=0, Total=55932 [2021-05-06 11:59:30,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-05-06 11:59:30,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 212. [2021-05-06 11:59:30,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 205 states have (on average 1.024390243902439) internal successors, (210), 206 states have internal predecessors, (210), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:59:30,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 216 transitions. [2021-05-06 11:59:30,532 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 216 transitions. Word has length 203 [2021-05-06 11:59:30,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:30,532 INFO L480 AbstractCegarLoop]: Abstraction has 212 states and 216 transitions. [2021-05-06 11:59:30,532 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 120 states, 120 states have (on average 1.6583333333333334) internal successors, (199), 119 states have internal predecessors, (199), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:30,532 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 216 transitions. [2021-05-06 11:59:30,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2021-05-06 11:59:30,533 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:30,533 INFO L523 BasicCegarLoop]: trace histogram [78, 77, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:30,533 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable119 [2021-05-06 11:59:30,533 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:30,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:30,533 INFO L82 PathProgramCache]: Analyzing trace with hash -1133322502, now seen corresponding path program 40 times [2021-05-06 11:59:30,533 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:30,533 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [443512077] [2021-05-06 11:59:30,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:30,544 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:30,544 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:30,548 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:30,556 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:30,562 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:30,565 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:30,566 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:30,567 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:30,579 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:30,581 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:30,598 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:30,612 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:30,613 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:30,616 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:30,629 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:30,630 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:30,639 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:30,641 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:30,649 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:30,662 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:30,665 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:30,672 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:30,676 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:30,681 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:30,689 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:30,690 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:30,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:31,358 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:31,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:31,360 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:59:31,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:31,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:34,272 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:34,272 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [443512077] [2021-05-06 11:59:34,272 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [443512077] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:34,272 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:34,272 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [123] imperfect sequences [] total 123 [2021-05-06 11:59:34,272 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605765086] [2021-05-06 11:59:34,272 INFO L460 AbstractCegarLoop]: Interpolant automaton has 123 states [2021-05-06 11:59:34,272 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:34,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2021-05-06 11:59:34,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4380, Invalid=10626, Unknown=0, NotChecked=0, Total=15006 [2021-05-06 11:59:34,274 INFO L87 Difference]: Start difference. First operand 212 states and 216 transitions. Second operand has 123 states, 123 states have (on average 1.6585365853658536) internal successors, (204), 122 states have internal predecessors, (204), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:46,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:46,257 INFO L93 Difference]: Finished difference Result 421 states and 434 transitions. [2021-05-06 11:59:46,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2021-05-06 11:59:46,258 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 1.6585365853658536) internal successors, (204), 122 states have internal predecessors, (204), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 208 [2021-05-06 11:59:46,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:46,259 INFO L225 Difference]: With dead ends: 421 [2021-05-06 11:59:46,259 INFO L226 Difference]: Without dead ends: 217 [2021-05-06 11:59:46,261 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 85 SyntacticMatches, 1 SemanticMatches, 241 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16778 ImplicationChecksByTransitivity, 10789.8ms TimeCoverageRelationStatistics Valid=13134, Invalid=45672, Unknown=0, NotChecked=0, Total=58806 [2021-05-06 11:59:46,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2021-05-06 11:59:46,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 217. [2021-05-06 11:59:46,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 210 states have (on average 1.0238095238095237) internal successors, (215), 211 states have internal predecessors, (215), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 11:59:46,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 221 transitions. [2021-05-06 11:59:46,271 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 221 transitions. Word has length 208 [2021-05-06 11:59:46,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:46,271 INFO L480 AbstractCegarLoop]: Abstraction has 217 states and 221 transitions. [2021-05-06 11:59:46,271 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 123 states, 123 states have (on average 1.6585365853658536) internal successors, (204), 122 states have internal predecessors, (204), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:46,271 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 221 transitions. [2021-05-06 11:59:46,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2021-05-06 11:59:46,272 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:46,272 INFO L523 BasicCegarLoop]: trace histogram [80, 79, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:46,272 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable122 [2021-05-06 11:59:46,272 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:46,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:46,273 INFO L82 PathProgramCache]: Analyzing trace with hash -2083448033, now seen corresponding path program 41 times [2021-05-06 11:59:46,273 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:46,273 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [946232431] [2021-05-06 11:59:46,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:46,278 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 11:59:46,283 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:46,286 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:46,290 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 11:59:46,297 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:46,301 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:46,301 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:46,302 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:46,309 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:46,311 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:46,329 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:46,342 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:46,343 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:46,345 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 11:59:46,346 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:46,347 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:46,354 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 11:59:46,356 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 11:59:46,373 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 11:59:46,387 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:46,389 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 11:59:46,389 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:46,393 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 11:59:46,401 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 11:59:46,408 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:46,409 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:46,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:47,192 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:47,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:47,209 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:59:47,212 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:50,277 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:50,277 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [946232431] [2021-05-06 11:59:50,277 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [946232431] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:50,277 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:50,277 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [126] imperfect sequences [] total 126 [2021-05-06 11:59:50,277 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1832050768] [2021-05-06 11:59:50,277 INFO L460 AbstractCegarLoop]: Interpolant automaton has 126 states [2021-05-06 11:59:50,277 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:50,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 126 interpolants. [2021-05-06 11:59:50,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4770, Invalid=11742, Unknown=0, NotChecked=0, Total=16512 [2021-05-06 11:59:50,278 INFO L87 Difference]: Start difference. First operand 217 states and 221 transitions. Second operand has 126 states, 126 states have (on average 1.6587301587301588) internal successors, (209), 125 states have internal predecessors, (209), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:02,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:02,781 INFO L93 Difference]: Finished difference Result 587 states and 600 transitions. [2021-05-06 12:00:02,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2021-05-06 12:00:02,781 INFO L78 Accepts]: Start accepts. Automaton has has 126 states, 126 states have (on average 1.6587301587301588) internal successors, (209), 125 states have internal predecessors, (209), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 213 [2021-05-06 12:00:02,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:02,782 INFO L225 Difference]: With dead ends: 587 [2021-05-06 12:00:02,782 INFO L226 Difference]: Without dead ends: 378 [2021-05-06 12:00:02,785 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 86 SyntacticMatches, 1 SemanticMatches, 250 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18443 ImplicationChecksByTransitivity, 11362.4ms TimeCoverageRelationStatistics Valid=13953, Invalid=49299, Unknown=0, NotChecked=0, Total=63252 [2021-05-06 12:00:02,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2021-05-06 12:00:02,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 378. [2021-05-06 12:00:02,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 378 states, 371 states have (on average 1.0161725067385445) internal successors, (377), 372 states have internal predecessors, (377), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:00:02,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 383 transitions. [2021-05-06 12:00:02,804 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 383 transitions. Word has length 213 [2021-05-06 12:00:02,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:02,804 INFO L480 AbstractCegarLoop]: Abstraction has 378 states and 383 transitions. [2021-05-06 12:00:02,804 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 126 states, 126 states have (on average 1.6587301587301588) internal successors, (209), 125 states have internal predecessors, (209), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:02,805 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 383 transitions. [2021-05-06 12:00:02,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2021-05-06 12:00:02,805 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:02,805 INFO L523 BasicCegarLoop]: trace histogram [81, 80, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:02,806 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable125 [2021-05-06 12:00:02,806 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:02,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:02,806 INFO L82 PathProgramCache]: Analyzing trace with hash 1249077417, now seen corresponding path program 42 times [2021-05-06 12:00:02,806 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:02,806 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2001817524] [2021-05-06 12:00:02,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:02,811 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:00:02,812 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:02,815 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:02,823 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:00:02,829 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:02,832 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:02,833 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:02,834 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:02,841 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:02,842 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:02,859 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:02,872 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:02,873 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:02,875 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:02,887 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:02,889 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:02,896 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:02,897 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:02,905 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:02,917 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:02,920 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:00:02,920 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:02,923 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:02,938 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:00:02,944 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:02,945 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:02,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:03,663 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:03,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:03,681 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:00:03,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:03,683 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:06,875 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:06,876 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2001817524] [2021-05-06 12:00:06,876 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2001817524] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:06,876 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:06,876 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [128] imperfect sequences [] total 128 [2021-05-06 12:00:06,876 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775409167] [2021-05-06 12:00:06,876 INFO L460 AbstractCegarLoop]: Interpolant automaton has 128 states [2021-05-06 12:00:06,876 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:06,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2021-05-06 12:00:06,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4763, Invalid=11493, Unknown=0, NotChecked=0, Total=16256 [2021-05-06 12:00:06,878 INFO L87 Difference]: Start difference. First operand 378 states and 383 transitions. Second operand has 128 states, 128 states have (on average 1.65625) internal successors, (212), 127 states have internal predecessors, (212), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:20,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:20,048 INFO L93 Difference]: Finished difference Result 595 states and 611 transitions. [2021-05-06 12:00:20,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2021-05-06 12:00:20,048 INFO L78 Accepts]: Start accepts. Automaton has has 128 states, 128 states have (on average 1.65625) internal successors, (212), 127 states have internal predecessors, (212), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 216 [2021-05-06 12:00:20,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:20,049 INFO L225 Difference]: With dead ends: 595 [2021-05-06 12:00:20,049 INFO L226 Difference]: Without dead ends: 385 [2021-05-06 12:00:20,051 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 88 SyntacticMatches, 1 SemanticMatches, 251 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18247 ImplicationChecksByTransitivity, 11788.5ms TimeCoverageRelationStatistics Valid=14283, Invalid=49473, Unknown=0, NotChecked=0, Total=63756 [2021-05-06 12:00:20,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2021-05-06 12:00:20,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 225. [2021-05-06 12:00:20,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 218 states have (on average 1.0229357798165137) internal successors, (223), 219 states have internal predecessors, (223), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:00:20,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 229 transitions. [2021-05-06 12:00:20,063 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 229 transitions. Word has length 216 [2021-05-06 12:00:20,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:20,063 INFO L480 AbstractCegarLoop]: Abstraction has 225 states and 229 transitions. [2021-05-06 12:00:20,063 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 128 states, 128 states have (on average 1.65625) internal successors, (212), 127 states have internal predecessors, (212), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:20,064 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 229 transitions. [2021-05-06 12:00:20,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2021-05-06 12:00:20,064 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:20,064 INFO L523 BasicCegarLoop]: trace histogram [83, 82, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:20,064 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable128 [2021-05-06 12:00:20,065 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:20,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:20,065 INFO L82 PathProgramCache]: Analyzing trace with hash 131494224, now seen corresponding path program 43 times [2021-05-06 12:00:20,065 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:20,065 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [908285778] [2021-05-06 12:00:20,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:20,070 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:00:20,075 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:20,079 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:20,083 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:00:20,090 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:20,096 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:20,110 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:20,111 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:20,120 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:20,122 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:20,130 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:20,144 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:20,145 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:20,148 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:20,148 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:20,149 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:20,158 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:20,159 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:20,179 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:20,194 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:20,196 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:00:20,197 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:20,202 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:20,212 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:00:20,219 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 12:00:20,220 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:20,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:21,128 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:21,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:21,142 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:00:21,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:24,500 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:24,500 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [908285778] [2021-05-06 12:00:24,500 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [908285778] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:24,500 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:24,500 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [131] imperfect sequences [] total 131 [2021-05-06 12:00:24,500 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1880694181] [2021-05-06 12:00:24,500 INFO L460 AbstractCegarLoop]: Interpolant automaton has 131 states [2021-05-06 12:00:24,500 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:24,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2021-05-06 12:00:24,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5169, Invalid=12653, Unknown=0, NotChecked=0, Total=17822 [2021-05-06 12:00:24,502 INFO L87 Difference]: Start difference. First operand 225 states and 229 transitions. Second operand has 131 states, 131 states have (on average 1.6564885496183206) internal successors, (217), 130 states have internal predecessors, (217), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:38,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:38,256 INFO L93 Difference]: Finished difference Result 609 states and 622 transitions. [2021-05-06 12:00:38,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 131 states. [2021-05-06 12:00:38,257 INFO L78 Accepts]: Start accepts. Automaton has has 131 states, 131 states have (on average 1.6564885496183206) internal successors, (217), 130 states have internal predecessors, (217), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 221 [2021-05-06 12:00:38,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:38,258 INFO L225 Difference]: With dead ends: 609 [2021-05-06 12:00:38,258 INFO L226 Difference]: Without dead ends: 392 [2021-05-06 12:00:38,260 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 89 SyntacticMatches, 1 SemanticMatches, 260 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19980 ImplicationChecksByTransitivity, 12501.3ms TimeCoverageRelationStatistics Valid=15136, Invalid=53246, Unknown=0, NotChecked=0, Total=68382 [2021-05-06 12:00:38,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 392 states. [2021-05-06 12:00:38,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 392 to 392. [2021-05-06 12:00:38,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 392 states, 385 states have (on average 1.0155844155844156) internal successors, (391), 386 states have internal predecessors, (391), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:00:38,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 392 states to 392 states and 397 transitions. [2021-05-06 12:00:38,280 INFO L78 Accepts]: Start accepts. Automaton has 392 states and 397 transitions. Word has length 221 [2021-05-06 12:00:38,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:38,280 INFO L480 AbstractCegarLoop]: Abstraction has 392 states and 397 transitions. [2021-05-06 12:00:38,280 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 131 states, 131 states have (on average 1.6564885496183206) internal successors, (217), 130 states have internal predecessors, (217), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:38,280 INFO L276 IsEmpty]: Start isEmpty. Operand 392 states and 397 transitions. [2021-05-06 12:00:38,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2021-05-06 12:00:38,281 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:38,281 INFO L523 BasicCegarLoop]: trace histogram [84, 83, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:38,281 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable131 [2021-05-06 12:00:38,281 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:38,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:38,281 INFO L82 PathProgramCache]: Analyzing trace with hash 1446708120, now seen corresponding path program 44 times [2021-05-06 12:00:38,281 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:38,281 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1420422225] [2021-05-06 12:00:38,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:38,286 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:00:38,292 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:38,295 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:38,298 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:00:38,305 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 12:00:38,308 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:38,321 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:38,323 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:38,329 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:38,331 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:38,339 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:38,353 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:38,354 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:38,356 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:38,369 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:38,370 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:38,378 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:38,380 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:38,388 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:38,401 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 12:00:38,408 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:00:38,408 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:38,412 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:38,420 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:00:38,428 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:38,429 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:38,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:39,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:39,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:39,253 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:00:39,254 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:39,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:42,711 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:42,711 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1420422225] [2021-05-06 12:00:42,711 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1420422225] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:42,711 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:42,711 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [133] imperfect sequences [] total 133 [2021-05-06 12:00:42,712 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760194493] [2021-05-06 12:00:42,712 INFO L460 AbstractCegarLoop]: Interpolant automaton has 133 states [2021-05-06 12:00:42,712 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:42,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2021-05-06 12:00:42,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5162, Invalid=12394, Unknown=0, NotChecked=0, Total=17556 [2021-05-06 12:00:42,713 INFO L87 Difference]: Start difference. First operand 392 states and 397 transitions. Second operand has 133 states, 133 states have (on average 1.6541353383458646) internal successors, (220), 132 states have internal predecessors, (220), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:56,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:56,954 INFO L93 Difference]: Finished difference Result 617 states and 633 transitions. [2021-05-06 12:00:56,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2021-05-06 12:00:56,955 INFO L78 Accepts]: Start accepts. Automaton has has 133 states, 133 states have (on average 1.6541353383458646) internal successors, (220), 132 states have internal predecessors, (220), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 224 [2021-05-06 12:00:56,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:56,956 INFO L225 Difference]: With dead ends: 617 [2021-05-06 12:00:56,956 INFO L226 Difference]: Without dead ends: 399 [2021-05-06 12:00:56,958 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 353 GetRequests, 91 SyntacticMatches, 1 SemanticMatches, 261 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19777 ImplicationChecksByTransitivity, 12628.6ms TimeCoverageRelationStatistics Valid=15480, Invalid=53426, Unknown=0, NotChecked=0, Total=68906 [2021-05-06 12:00:56,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 399 states. [2021-05-06 12:00:56,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 399 to 233. [2021-05-06 12:00:56,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 226 states have (on average 1.0221238938053097) internal successors, (231), 227 states have internal predecessors, (231), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:00:56,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 237 transitions. [2021-05-06 12:00:56,970 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 237 transitions. Word has length 224 [2021-05-06 12:00:56,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:56,970 INFO L480 AbstractCegarLoop]: Abstraction has 233 states and 237 transitions. [2021-05-06 12:00:56,970 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 133 states, 133 states have (on average 1.6541353383458646) internal successors, (220), 132 states have internal predecessors, (220), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:56,970 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 237 transitions. [2021-05-06 12:00:56,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2021-05-06 12:00:56,971 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:56,971 INFO L523 BasicCegarLoop]: trace histogram [86, 85, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:56,971 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable134 [2021-05-06 12:00:56,971 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:56,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:56,972 INFO L82 PathProgramCache]: Analyzing trace with hash 78437953, now seen corresponding path program 45 times [2021-05-06 12:00:56,972 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:56,972 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [162479466] [2021-05-06 12:00:56,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:56,977 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:00:56,977 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:56,980 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:56,989 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:00:56,996 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 12:00:56,998 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:57,015 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:57,016 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:57,023 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:57,025 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:57,033 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:57,046 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:57,046 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:57,049 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:00:57,061 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:57,062 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:57,069 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:00:57,071 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:00:57,079 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:00:57,093 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:57,095 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:00:57,100 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:57,104 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:00:57,108 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:00:57,115 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:57,115 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:57,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:57,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:57,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:57,952 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:00:57,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:57,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:01,501 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:01:01,502 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [162479466] [2021-05-06 12:01:01,502 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [162479466] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:01:01,502 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:01:01,502 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [136] imperfect sequences [] total 136 [2021-05-06 12:01:01,502 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453544609] [2021-05-06 12:01:01,502 INFO L460 AbstractCegarLoop]: Interpolant automaton has 136 states [2021-05-06 12:01:01,502 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:01:01,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2021-05-06 12:01:01,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5392, Invalid=12968, Unknown=0, NotChecked=0, Total=18360 [2021-05-06 12:01:01,504 INFO L87 Difference]: Start difference. First operand 233 states and 237 transitions. Second operand has 136 states, 136 states have (on average 1.6544117647058822) internal successors, (225), 135 states have internal predecessors, (225), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:15,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:01:15,890 INFO L93 Difference]: Finished difference Result 463 states and 476 transitions. [2021-05-06 12:01:15,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 136 states. [2021-05-06 12:01:15,891 INFO L78 Accepts]: Start accepts. Automaton has has 136 states, 136 states have (on average 1.6544117647058822) internal successors, (225), 135 states have internal predecessors, (225), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 229 [2021-05-06 12:01:15,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:01:15,891 INFO L225 Difference]: With dead ends: 463 [2021-05-06 12:01:15,891 INFO L226 Difference]: Without dead ends: 238 [2021-05-06 12:01:15,894 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 93 SyntacticMatches, 1 SemanticMatches, 267 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20699 ImplicationChecksByTransitivity, 13046.2ms TimeCoverageRelationStatistics Valid=16170, Invalid=55922, Unknown=0, NotChecked=0, Total=72092 [2021-05-06 12:01:15,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2021-05-06 12:01:15,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 238. [2021-05-06 12:01:15,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 238 states, 231 states have (on average 1.0216450216450217) internal successors, (236), 232 states have internal predecessors, (236), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:01:15,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 242 transitions. [2021-05-06 12:01:15,905 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 242 transitions. Word has length 229 [2021-05-06 12:01:15,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:01:15,905 INFO L480 AbstractCegarLoop]: Abstraction has 238 states and 242 transitions. [2021-05-06 12:01:15,905 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 136 states, 136 states have (on average 1.6544117647058822) internal successors, (225), 135 states have internal predecessors, (225), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:15,905 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 242 transitions. [2021-05-06 12:01:15,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2021-05-06 12:01:15,906 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:01:15,906 INFO L523 BasicCegarLoop]: trace histogram [88, 87, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:01:15,906 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable137 [2021-05-06 12:01:15,906 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:01:15,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:01:15,907 INFO L82 PathProgramCache]: Analyzing trace with hash -1752613748, now seen corresponding path program 46 times [2021-05-06 12:01:15,907 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:01:15,907 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1701789269] [2021-05-06 12:01:15,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:01:15,912 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:01:15,917 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:15,920 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:15,924 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:01:15,931 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:15,934 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:15,946 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:15,947 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:15,954 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:15,955 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:15,963 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:15,976 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:15,977 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:15,979 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:15,979 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:15,980 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:15,987 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:15,989 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:16,006 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:16,019 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:16,021 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:01:16,027 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:16,031 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:16,034 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:01:16,041 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:16,042 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:16,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:16,896 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:01:16,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:16,901 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:01:16,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:16,903 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:20,593 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:01:20,593 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1701789269] [2021-05-06 12:01:20,593 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1701789269] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:01:20,594 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:01:20,594 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [139] imperfect sequences [] total 139 [2021-05-06 12:01:20,594 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182142422] [2021-05-06 12:01:20,594 INFO L460 AbstractCegarLoop]: Interpolant automaton has 139 states [2021-05-06 12:01:20,594 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:01:20,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2021-05-06 12:01:20,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5627, Invalid=13555, Unknown=0, NotChecked=0, Total=19182 [2021-05-06 12:01:20,595 INFO L87 Difference]: Start difference. First operand 238 states and 242 transitions. Second operand has 139 states, 139 states have (on average 1.6546762589928057) internal successors, (230), 138 states have internal predecessors, (230), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:35,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:01:35,707 INFO L93 Difference]: Finished difference Result 473 states and 486 transitions. [2021-05-06 12:01:35,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2021-05-06 12:01:35,708 INFO L78 Accepts]: Start accepts. Automaton has has 139 states, 139 states have (on average 1.6546762589928057) internal successors, (230), 138 states have internal predecessors, (230), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 234 [2021-05-06 12:01:35,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:01:35,709 INFO L225 Difference]: With dead ends: 473 [2021-05-06 12:01:35,709 INFO L226 Difference]: Without dead ends: 243 [2021-05-06 12:01:35,711 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 369 GetRequests, 95 SyntacticMatches, 1 SemanticMatches, 273 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21642 ImplicationChecksByTransitivity, 13570.1ms TimeCoverageRelationStatistics Valid=16875, Invalid=58475, Unknown=0, NotChecked=0, Total=75350 [2021-05-06 12:01:35,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2021-05-06 12:01:35,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 243. [2021-05-06 12:01:35,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 236 states have (on average 1.021186440677966) internal successors, (241), 237 states have internal predecessors, (241), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:01:35,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 247 transitions. [2021-05-06 12:01:35,722 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 247 transitions. Word has length 234 [2021-05-06 12:01:35,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:01:35,722 INFO L480 AbstractCegarLoop]: Abstraction has 243 states and 247 transitions. [2021-05-06 12:01:35,723 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 139 states, 139 states have (on average 1.6546762589928057) internal successors, (230), 138 states have internal predecessors, (230), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:35,723 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 247 transitions. [2021-05-06 12:01:35,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 240 [2021-05-06 12:01:35,723 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:01:35,723 INFO L523 BasicCegarLoop]: trace histogram [90, 89, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:01:35,723 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable140 [2021-05-06 12:01:35,724 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:01:35,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:01:35,724 INFO L82 PathProgramCache]: Analyzing trace with hash -834729907, now seen corresponding path program 47 times [2021-05-06 12:01:35,724 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:01:35,724 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [620403801] [2021-05-06 12:01:35,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:01:35,729 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:01:35,734 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:35,738 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:35,742 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:01:35,748 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:35,751 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:35,751 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:35,752 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:35,760 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:35,761 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:35,779 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:35,792 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 12:01:35,793 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:35,795 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:35,796 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:35,797 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:35,804 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:35,806 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:35,824 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:35,838 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:35,840 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:01:35,840 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:35,844 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:35,852 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:01:35,859 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:35,860 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:35,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:36,746 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:01:36,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:36,749 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:01:36,750 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:36,751 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:40,568 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:01:40,568 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [620403801] [2021-05-06 12:01:40,569 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [620403801] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:01:40,569 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:01:40,569 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [142] imperfect sequences [] total 142 [2021-05-06 12:01:40,569 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1266694436] [2021-05-06 12:01:40,569 INFO L460 AbstractCegarLoop]: Interpolant automaton has 142 states [2021-05-06 12:01:40,569 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:01:40,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 142 interpolants. [2021-05-06 12:01:40,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5867, Invalid=14155, Unknown=0, NotChecked=0, Total=20022 [2021-05-06 12:01:40,570 INFO L87 Difference]: Start difference. First operand 243 states and 247 transitions. Second operand has 142 states, 142 states have (on average 1.6549295774647887) internal successors, (235), 141 states have internal predecessors, (235), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:56,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:01:56,423 INFO L93 Difference]: Finished difference Result 483 states and 496 transitions. [2021-05-06 12:01:56,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2021-05-06 12:01:56,424 INFO L78 Accepts]: Start accepts. Automaton has has 142 states, 142 states have (on average 1.6549295774647887) internal successors, (235), 141 states have internal predecessors, (235), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 239 [2021-05-06 12:01:56,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:01:56,424 INFO L225 Difference]: With dead ends: 483 [2021-05-06 12:01:56,424 INFO L226 Difference]: Without dead ends: 248 [2021-05-06 12:01:56,427 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 377 GetRequests, 97 SyntacticMatches, 1 SemanticMatches, 279 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22606 ImplicationChecksByTransitivity, 14108.9ms TimeCoverageRelationStatistics Valid=17595, Invalid=61085, Unknown=0, NotChecked=0, Total=78680 [2021-05-06 12:01:56,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2021-05-06 12:01:56,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 248. [2021-05-06 12:01:56,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 248 states, 241 states have (on average 1.020746887966805) internal successors, (246), 242 states have internal predecessors, (246), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:01:56,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 252 transitions. [2021-05-06 12:01:56,440 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 252 transitions. Word has length 239 [2021-05-06 12:01:56,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:01:56,440 INFO L480 AbstractCegarLoop]: Abstraction has 248 states and 252 transitions. [2021-05-06 12:01:56,441 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 142 states, 142 states have (on average 1.6549295774647887) internal successors, (235), 141 states have internal predecessors, (235), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:01:56,441 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 252 transitions. [2021-05-06 12:01:56,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2021-05-06 12:01:56,441 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:01:56,441 INFO L523 BasicCegarLoop]: trace histogram [92, 91, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:01:56,442 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable143 [2021-05-06 12:01:56,442 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:01:56,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:01:56,442 INFO L82 PathProgramCache]: Analyzing trace with hash -893788288, now seen corresponding path program 48 times [2021-05-06 12:01:56,442 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:01:56,442 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1017474529] [2021-05-06 12:01:56,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:01:56,447 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:01:56,447 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:56,454 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:56,462 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:01:56,469 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:56,471 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:56,472 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:56,473 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:56,497 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:56,499 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:56,518 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:56,532 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:56,533 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:56,535 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:01:56,549 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:56,550 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:56,558 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:01:56,560 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:01:56,567 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:01:56,581 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:56,583 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:01:56,584 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:56,587 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:01:56,595 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:01:56,602 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:56,603 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:56,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:57,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:01:57,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:57,687 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:01:57,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:01,713 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:02:01,713 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1017474529] [2021-05-06 12:02:01,713 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1017474529] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:02:01,713 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:02:01,713 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [145] imperfect sequences [] total 145 [2021-05-06 12:02:01,713 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503775001] [2021-05-06 12:02:01,714 INFO L460 AbstractCegarLoop]: Interpolant automaton has 145 states [2021-05-06 12:02:01,714 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:02:01,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 145 interpolants. [2021-05-06 12:02:01,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6316, Invalid=15440, Unknown=0, NotChecked=0, Total=21756 [2021-05-06 12:02:01,715 INFO L87 Difference]: Start difference. First operand 248 states and 252 transitions. Second operand has 145 states, 145 states have (on average 1.6551724137931034) internal successors, (240), 144 states have internal predecessors, (240), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:18,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:02:18,651 INFO L93 Difference]: Finished difference Result 673 states and 686 transitions. [2021-05-06 12:02:18,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 145 states. [2021-05-06 12:02:18,651 INFO L78 Accepts]: Start accepts. Automaton has has 145 states, 145 states have (on average 1.6551724137931034) internal successors, (240), 144 states have internal predecessors, (240), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 244 [2021-05-06 12:02:18,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:02:18,653 INFO L225 Difference]: With dead ends: 673 [2021-05-06 12:02:18,653 INFO L226 Difference]: Without dead ends: 433 [2021-05-06 12:02:18,656 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 387 GetRequests, 98 SyntacticMatches, 1 SemanticMatches, 288 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24530 ImplicationChecksByTransitivity, 15041.9ms TimeCoverageRelationStatistics Valid=18539, Invalid=65271, Unknown=0, NotChecked=0, Total=83810 [2021-05-06 12:02:18,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 433 states. [2021-05-06 12:02:18,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 433 to 433. [2021-05-06 12:02:18,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 433 states, 426 states have (on average 1.0140845070422535) internal successors, (432), 427 states have internal predecessors, (432), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:02:18,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 438 transitions. [2021-05-06 12:02:18,678 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 438 transitions. Word has length 244 [2021-05-06 12:02:18,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:02:18,678 INFO L480 AbstractCegarLoop]: Abstraction has 433 states and 438 transitions. [2021-05-06 12:02:18,678 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 145 states, 145 states have (on average 1.6551724137931034) internal successors, (240), 144 states have internal predecessors, (240), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:18,679 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 438 transitions. [2021-05-06 12:02:18,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2021-05-06 12:02:18,680 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:02:18,680 INFO L523 BasicCegarLoop]: trace histogram [93, 92, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:02:18,680 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable146 [2021-05-06 12:02:18,680 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:02:18,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:02:18,680 INFO L82 PathProgramCache]: Analyzing trace with hash -1605105730, now seen corresponding path program 49 times [2021-05-06 12:02:18,680 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:02:18,680 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [960178185] [2021-05-06 12:02:18,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:02:18,686 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:02:18,686 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:18,690 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:18,698 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:02:18,707 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:18,711 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:18,711 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:18,712 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:18,721 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:18,723 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:18,744 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:18,760 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:18,761 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:18,763 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:18,764 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:18,765 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:18,773 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:18,775 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:18,796 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:18,812 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:18,814 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:02:18,815 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:18,819 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:18,830 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:02:18,838 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:18,838 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:18,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:19,893 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:02:19,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:19,897 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:02:19,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:19,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:24,131 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:02:24,131 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [960178185] [2021-05-06 12:02:24,131 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [960178185] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:02:24,131 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:02:24,131 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [147] imperfect sequences [] total 147 [2021-05-06 12:02:24,131 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914852159] [2021-05-06 12:02:24,132 INFO L460 AbstractCegarLoop]: Interpolant automaton has 147 states [2021-05-06 12:02:24,132 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:02:24,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 147 interpolants. [2021-05-06 12:02:24,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6309, Invalid=15153, Unknown=0, NotChecked=0, Total=21462 [2021-05-06 12:02:24,133 INFO L87 Difference]: Start difference. First operand 433 states and 438 transitions. Second operand has 147 states, 147 states have (on average 1.653061224489796) internal successors, (243), 146 states have internal predecessors, (243), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:40,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:02:40,708 INFO L93 Difference]: Finished difference Result 681 states and 697 transitions. [2021-05-06 12:02:40,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 147 states. [2021-05-06 12:02:40,708 INFO L78 Accepts]: Start accepts. Automaton has has 147 states, 147 states have (on average 1.653061224489796) internal successors, (243), 146 states have internal predecessors, (243), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 247 [2021-05-06 12:02:40,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:02:40,709 INFO L225 Difference]: With dead ends: 681 [2021-05-06 12:02:40,709 INFO L226 Difference]: Without dead ends: 440 [2021-05-06 12:02:40,712 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 390 GetRequests, 100 SyntacticMatches, 1 SemanticMatches, 289 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24305 ImplicationChecksByTransitivity, 15200.9ms TimeCoverageRelationStatistics Valid=18921, Invalid=65469, Unknown=0, NotChecked=0, Total=84390 [2021-05-06 12:02:40,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 440 states. [2021-05-06 12:02:40,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 440 to 256. [2021-05-06 12:02:40,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 249 states have (on average 1.0200803212851406) internal successors, (254), 250 states have internal predecessors, (254), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:02:40,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 260 transitions. [2021-05-06 12:02:40,724 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 260 transitions. Word has length 247 [2021-05-06 12:02:40,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:02:40,724 INFO L480 AbstractCegarLoop]: Abstraction has 256 states and 260 transitions. [2021-05-06 12:02:40,724 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 147 states, 147 states have (on average 1.653061224489796) internal successors, (243), 146 states have internal predecessors, (243), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:02:40,725 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 260 transitions. [2021-05-06 12:02:40,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2021-05-06 12:02:40,725 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:02:40,725 INFO L523 BasicCegarLoop]: trace histogram [95, 94, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:02:40,726 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable149 [2021-05-06 12:02:40,726 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:02:40,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:02:40,726 INFO L82 PathProgramCache]: Analyzing trace with hash -1254431697, now seen corresponding path program 50 times [2021-05-06 12:02:40,726 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:02:40,726 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1413231251] [2021-05-06 12:02:40,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:02:40,731 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:02:40,736 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:40,739 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:40,743 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:02:40,749 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:40,752 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:40,753 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:40,754 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:40,761 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:40,763 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:40,781 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:40,794 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 12:02:40,795 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:40,797 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:02:40,810 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:40,813 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:40,820 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:02:40,822 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:02:40,829 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:02:40,843 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:40,845 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:02:40,845 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:02:40,848 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:02:40,857 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:02:40,864 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:02:40,864 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:02:40,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:41,845 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:02:41,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:02:41,847 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:02:41,848 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:41,849 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:45,978 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:02:45,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1413231251] [2021-05-06 12:02:45,979 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1413231251] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:02:45,979 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:02:45,979 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [150] imperfect sequences [] total 150 [2021-05-06 12:02:45,979 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1420424942] [2021-05-06 12:02:45,979 INFO L460 AbstractCegarLoop]: Interpolant automaton has 150 states [2021-05-06 12:02:45,979 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:02:45,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 150 interpolants. [2021-05-06 12:02:45,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6563, Invalid=15787, Unknown=0, NotChecked=0, Total=22350 [2021-05-06 12:02:45,981 INFO L87 Difference]: Start difference. First operand 256 states and 260 transitions. Second operand has 150 states, 150 states have (on average 1.6533333333333333) internal successors, (248), 149 states have internal predecessors, (248), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:02,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:02,915 INFO L93 Difference]: Finished difference Result 509 states and 522 transitions. [2021-05-06 12:03:02,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 150 states. [2021-05-06 12:03:02,916 INFO L78 Accepts]: Start accepts. Automaton has has 150 states, 150 states have (on average 1.6533333333333333) internal successors, (248), 149 states have internal predecessors, (248), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 252 [2021-05-06 12:03:02,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:02,916 INFO L225 Difference]: With dead ends: 509 [2021-05-06 12:03:02,916 INFO L226 Difference]: Without dead ends: 261 [2021-05-06 12:03:02,919 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 102 SyntacticMatches, 1 SemanticMatches, 295 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25326 ImplicationChecksByTransitivity, 15278.5ms TimeCoverageRelationStatistics Valid=19683, Invalid=68229, Unknown=0, NotChecked=0, Total=87912 [2021-05-06 12:03:02,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2021-05-06 12:03:02,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 261. [2021-05-06 12:03:02,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 254 states have (on average 1.0196850393700787) internal successors, (259), 255 states have internal predecessors, (259), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:02,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 265 transitions. [2021-05-06 12:03:02,939 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 265 transitions. Word has length 252 [2021-05-06 12:03:02,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:02,939 INFO L480 AbstractCegarLoop]: Abstraction has 261 states and 265 transitions. [2021-05-06 12:03:02,940 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 150 states, 150 states have (on average 1.6533333333333333) internal successors, (248), 149 states have internal predecessors, (248), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:02,940 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 265 transitions. [2021-05-06 12:03:02,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2021-05-06 12:03:02,940 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:02,940 INFO L523 BasicCegarLoop]: trace histogram [97, 96, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:02,941 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable152 [2021-05-06 12:03:02,941 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:02,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:02,941 INFO L82 PathProgramCache]: Analyzing trace with hash -1999133814, now seen corresponding path program 51 times [2021-05-06 12:03:02,941 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:02,941 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1330347848] [2021-05-06 12:03:02,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:02,946 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:03:02,951 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:02,954 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:02,958 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:03:02,964 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:02,967 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:03:02,980 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:02,981 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:02,987 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:02,989 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:02,997 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:03:03,010 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:03,011 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:03,013 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:03:03,026 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:03,027 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:03,034 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:03,036 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:03,043 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:03:03,057 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:03,059 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:03:03,064 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:03,067 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:03,071 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:03:03,078 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:03,078 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:03,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:04,208 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:04,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:04,210 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:04,211 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:08,517 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:08,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1330347848] [2021-05-06 12:03:08,517 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1330347848] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:08,517 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:08,517 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [153] imperfect sequences [] total 153 [2021-05-06 12:03:08,517 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1580043751] [2021-05-06 12:03:08,517 INFO L460 AbstractCegarLoop]: Interpolant automaton has 153 states [2021-05-06 12:03:08,517 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:08,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 153 interpolants. [2021-05-06 12:03:08,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7037, Invalid=17143, Unknown=0, NotChecked=0, Total=24180 [2021-05-06 12:03:08,519 INFO L87 Difference]: Start difference. First operand 261 states and 265 transitions. Second operand has 153 states, 153 states have (on average 1.65359477124183) internal successors, (253), 152 states have internal predecessors, (253), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:26,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:26,555 INFO L93 Difference]: Finished difference Result 709 states and 722 transitions. [2021-05-06 12:03:26,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 153 states. [2021-05-06 12:03:26,555 INFO L78 Accepts]: Start accepts. Automaton has has 153 states, 153 states have (on average 1.65359477124183) internal successors, (253), 152 states have internal predecessors, (253), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 257 [2021-05-06 12:03:26,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:26,556 INFO L225 Difference]: With dead ends: 709 [2021-05-06 12:03:26,557 INFO L226 Difference]: Without dead ends: 456 [2021-05-06 12:03:26,559 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 304 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27359 ImplicationChecksByTransitivity, 16014.8ms TimeCoverageRelationStatistics Valid=20680, Invalid=72650, Unknown=0, NotChecked=0, Total=93330 [2021-05-06 12:03:26,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 456 states. [2021-05-06 12:03:26,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 456 to 456. [2021-05-06 12:03:26,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 456 states, 449 states have (on average 1.0133630289532294) internal successors, (455), 450 states have internal predecessors, (455), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:26,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 461 transitions. [2021-05-06 12:03:26,580 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 461 transitions. Word has length 257 [2021-05-06 12:03:26,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:26,580 INFO L480 AbstractCegarLoop]: Abstraction has 456 states and 461 transitions. [2021-05-06 12:03:26,580 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 153 states, 153 states have (on average 1.65359477124183) internal successors, (253), 152 states have internal predecessors, (253), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:26,580 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 461 transitions. [2021-05-06 12:03:26,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 261 [2021-05-06 12:03:26,581 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:26,581 INFO L523 BasicCegarLoop]: trace histogram [98, 97, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:26,581 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable155 [2021-05-06 12:03:26,581 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:26,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:26,581 INFO L82 PathProgramCache]: Analyzing trace with hash 1287895582, now seen corresponding path program 52 times [2021-05-06 12:03:26,582 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:26,582 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [612743323] [2021-05-06 12:03:26,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:26,592 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:03:26,593 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:26,596 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:26,603 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:03:26,609 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:26,612 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:03:26,612 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:26,613 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:26,619 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:26,621 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:26,637 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:03:26,649 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:26,650 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:26,652 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:03:26,663 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:26,665 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:26,671 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:26,672 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:26,680 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:03:26,692 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:26,694 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:03:26,699 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:26,702 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:26,706 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:03:26,712 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:26,713 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:26,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:27,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:27,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:27,797 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:27,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:27,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:32,221 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:32,222 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [612743323] [2021-05-06 12:03:32,222 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [612743323] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:32,222 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:32,222 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [155] imperfect sequences [] total 155 [2021-05-06 12:03:32,222 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069651090] [2021-05-06 12:03:32,222 INFO L460 AbstractCegarLoop]: Interpolant automaton has 155 states [2021-05-06 12:03:32,222 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:32,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2021-05-06 12:03:32,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7030, Invalid=16840, Unknown=0, NotChecked=0, Total=23870 [2021-05-06 12:03:32,224 INFO L87 Difference]: Start difference. First operand 456 states and 461 transitions. Second operand has 155 states, 155 states have (on average 1.6516129032258065) internal successors, (256), 154 states have internal predecessors, (256), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:50,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:03:50,625 INFO L93 Difference]: Finished difference Result 717 states and 733 transitions. [2021-05-06 12:03:50,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 155 states. [2021-05-06 12:03:50,626 INFO L78 Accepts]: Start accepts. Automaton has has 155 states, 155 states have (on average 1.6516129032258065) internal successors, (256), 154 states have internal predecessors, (256), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 260 [2021-05-06 12:03:50,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:03:50,627 INFO L225 Difference]: With dead ends: 717 [2021-05-06 12:03:50,627 INFO L226 Difference]: Without dead ends: 463 [2021-05-06 12:03:50,630 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 305 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27070 ImplicationChecksByTransitivity, 16369.6ms TimeCoverageRelationStatistics Valid=21084, Invalid=72858, Unknown=0, NotChecked=0, Total=93942 [2021-05-06 12:03:50,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 463 states. [2021-05-06 12:03:50,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 463 to 269. [2021-05-06 12:03:50,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 269 states, 262 states have (on average 1.0190839694656488) internal successors, (267), 263 states have internal predecessors, (267), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:03:50,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 273 transitions. [2021-05-06 12:03:50,668 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 273 transitions. Word has length 260 [2021-05-06 12:03:50,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:03:50,668 INFO L480 AbstractCegarLoop]: Abstraction has 269 states and 273 transitions. [2021-05-06 12:03:50,668 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 155 states, 155 states have (on average 1.6516129032258065) internal successors, (256), 154 states have internal predecessors, (256), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:50,668 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 273 transitions. [2021-05-06 12:03:50,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2021-05-06 12:03:50,669 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:03:50,669 INFO L523 BasicCegarLoop]: trace histogram [100, 99, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:03:50,669 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable158 [2021-05-06 12:03:50,670 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:03:50,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:03:50,670 INFO L82 PathProgramCache]: Analyzing trace with hash -679004805, now seen corresponding path program 53 times [2021-05-06 12:03:50,670 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:03:50,670 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1659823792] [2021-05-06 12:03:50,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:03:50,675 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:03:50,681 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:50,684 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:50,688 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:03:50,694 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:50,697 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:03:50,697 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:50,698 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:50,705 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:50,707 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:50,723 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:03:50,735 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:50,736 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:50,738 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:03:50,749 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:50,750 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:50,757 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:03:50,759 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:03:50,766 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:03:50,777 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:03:50,779 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:03:50,780 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:03:50,783 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:03:50,790 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:03:50,797 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 12:03:50,797 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:03:50,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:52,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:03:52,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:03:52,041 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:03:52,042 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:52,042 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:56,627 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:56,627 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1659823792] [2021-05-06 12:03:56,627 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1659823792] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:56,627 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:56,627 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [158] imperfect sequences [] total 158 [2021-05-06 12:03:56,627 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729311767] [2021-05-06 12:03:56,628 INFO L460 AbstractCegarLoop]: Interpolant automaton has 158 states [2021-05-06 12:03:56,628 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:56,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2021-05-06 12:03:56,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7298, Invalid=17508, Unknown=0, NotChecked=0, Total=24806 [2021-05-06 12:03:56,629 INFO L87 Difference]: Start difference. First operand 269 states and 273 transitions. Second operand has 158 states, 158 states have (on average 1.6518987341772151) internal successors, (261), 157 states have internal predecessors, (261), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:15,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:15,390 INFO L93 Difference]: Finished difference Result 535 states and 548 transitions. [2021-05-06 12:04:15,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 158 states. [2021-05-06 12:04:15,391 INFO L78 Accepts]: Start accepts. Automaton has has 158 states, 158 states have (on average 1.6518987341772151) internal successors, (261), 157 states have internal predecessors, (261), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 265 [2021-05-06 12:04:15,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:15,392 INFO L225 Difference]: With dead ends: 535 [2021-05-06 12:04:15,392 INFO L226 Difference]: Without dead ends: 274 [2021-05-06 12:04:15,395 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 107 SyntacticMatches, 1 SemanticMatches, 311 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28200 ImplicationChecksByTransitivity, 17003.6ms TimeCoverageRelationStatistics Valid=21888, Invalid=75768, Unknown=0, NotChecked=0, Total=97656 [2021-05-06 12:04:15,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2021-05-06 12:04:15,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 274. [2021-05-06 12:04:15,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 274 states, 267 states have (on average 1.0187265917602997) internal successors, (272), 268 states have internal predecessors, (272), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:15,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 278 transitions. [2021-05-06 12:04:15,407 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 278 transitions. Word has length 265 [2021-05-06 12:04:15,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:15,407 INFO L480 AbstractCegarLoop]: Abstraction has 274 states and 278 transitions. [2021-05-06 12:04:15,407 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 158 states, 158 states have (on average 1.6518987341772151) internal successors, (261), 157 states have internal predecessors, (261), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:15,407 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 278 transitions. [2021-05-06 12:04:15,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 271 [2021-05-06 12:04:15,408 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:15,408 INFO L523 BasicCegarLoop]: trace histogram [102, 101, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:15,408 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable161 [2021-05-06 12:04:15,408 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:15,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:15,409 INFO L82 PathProgramCache]: Analyzing trace with hash -1899253870, now seen corresponding path program 54 times [2021-05-06 12:04:15,409 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:15,409 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1222828210] [2021-05-06 12:04:15,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:15,420 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:04:15,420 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:15,424 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:15,432 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:04:15,439 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:15,442 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:04:15,455 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:15,456 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:15,464 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:15,467 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:15,476 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:04:15,489 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:15,490 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:15,492 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:04:15,505 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:15,506 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:15,513 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:15,515 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:15,523 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:04:15,537 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:15,546 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:04:15,552 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:15,555 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:15,559 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:04:15,566 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 12:04:15,566 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:15,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:16,690 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:16,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:16,693 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:16,693 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:16,694 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:21,490 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:21,490 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1222828210] [2021-05-06 12:04:21,490 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1222828210] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:21,490 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:21,490 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [161] imperfect sequences [] total 161 [2021-05-06 12:04:21,490 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024262841] [2021-05-06 12:04:21,491 INFO L460 AbstractCegarLoop]: Interpolant automaton has 161 states [2021-05-06 12:04:21,491 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:21,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 161 interpolants. [2021-05-06 12:04:21,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7571, Invalid=18189, Unknown=0, NotChecked=0, Total=25760 [2021-05-06 12:04:21,492 INFO L87 Difference]: Start difference. First operand 274 states and 278 transitions. Second operand has 161 states, 161 states have (on average 1.6521739130434783) internal successors, (266), 160 states have internal predecessors, (266), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:40,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:40,905 INFO L93 Difference]: Finished difference Result 545 states and 558 transitions. [2021-05-06 12:04:40,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 161 states. [2021-05-06 12:04:40,906 INFO L78 Accepts]: Start accepts. Automaton has has 161 states, 161 states have (on average 1.6521739130434783) internal successors, (266), 160 states have internal predecessors, (266), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 270 [2021-05-06 12:04:40,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:40,906 INFO L225 Difference]: With dead ends: 545 [2021-05-06 12:04:40,906 INFO L226 Difference]: Without dead ends: 279 [2021-05-06 12:04:40,910 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 427 GetRequests, 109 SyntacticMatches, 1 SemanticMatches, 317 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29299 ImplicationChecksByTransitivity, 17477.2ms TimeCoverageRelationStatistics Valid=22707, Invalid=78735, Unknown=0, NotChecked=0, Total=101442 [2021-05-06 12:04:40,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2021-05-06 12:04:40,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 279. [2021-05-06 12:04:40,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 272 states have (on average 1.0183823529411764) internal successors, (277), 273 states have internal predecessors, (277), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:04:40,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 283 transitions. [2021-05-06 12:04:40,922 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 283 transitions. Word has length 270 [2021-05-06 12:04:40,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:40,922 INFO L480 AbstractCegarLoop]: Abstraction has 279 states and 283 transitions. [2021-05-06 12:04:40,922 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 161 states, 161 states have (on average 1.6521739130434783) internal successors, (266), 160 states have internal predecessors, (266), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:40,922 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 283 transitions. [2021-05-06 12:04:40,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2021-05-06 12:04:40,923 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:40,923 INFO L523 BasicCegarLoop]: trace histogram [104, 103, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:40,924 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable164 [2021-05-06 12:04:40,924 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:40,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:40,924 INFO L82 PathProgramCache]: Analyzing trace with hash 1194259207, now seen corresponding path program 55 times [2021-05-06 12:04:40,924 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:40,924 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [223987084] [2021-05-06 12:04:40,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:40,930 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:04:40,936 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,939 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:40,943 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:04:40,950 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:40,953 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:04:40,965 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,966 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,973 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:40,974 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:40,982 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:04:40,995 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:40,996 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:40,998 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:04:41,011 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:41,013 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:41,020 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:04:41,022 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:04:41,029 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:04:41,043 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 12:04:41,045 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:04:41,045 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:41,050 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:04:41,060 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:04:41,068 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:41,069 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:41,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:42,380 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:42,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:42,383 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:42,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:47,322 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:47,322 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [223987084] [2021-05-06 12:04:47,322 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [223987084] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:47,322 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:47,322 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [164] imperfect sequences [] total 164 [2021-05-06 12:04:47,322 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671372371] [2021-05-06 12:04:47,323 INFO L460 AbstractCegarLoop]: Interpolant automaton has 164 states [2021-05-06 12:04:47,323 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:47,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 164 interpolants. [2021-05-06 12:04:47,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8079, Invalid=19643, Unknown=0, NotChecked=0, Total=27722 [2021-05-06 12:04:47,325 INFO L87 Difference]: Start difference. First operand 279 states and 283 transitions. Second operand has 164 states, 164 states have (on average 1.6524390243902438) internal successors, (271), 163 states have internal predecessors, (271), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:07,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:07,969 INFO L93 Difference]: Finished difference Result 759 states and 772 transitions. [2021-05-06 12:05:07,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 164 states. [2021-05-06 12:05:07,970 INFO L78 Accepts]: Start accepts. Automaton has has 164 states, 164 states have (on average 1.6524390243902438) internal successors, (271), 163 states have internal predecessors, (271), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 275 [2021-05-06 12:05:07,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:07,971 INFO L225 Difference]: With dead ends: 759 [2021-05-06 12:05:07,971 INFO L226 Difference]: Without dead ends: 488 [2021-05-06 12:05:07,985 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 110 SyntacticMatches, 1 SemanticMatches, 326 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31482 ImplicationChecksByTransitivity, 18369.8ms TimeCoverageRelationStatistics Valid=23776, Invalid=83480, Unknown=0, NotChecked=0, Total=107256 [2021-05-06 12:05:07,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 488 states. [2021-05-06 12:05:08,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 488 to 488. [2021-05-06 12:05:08,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 488 states, 481 states have (on average 1.0124740124740124) internal successors, (487), 482 states have internal predecessors, (487), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:08,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 488 states to 488 states and 493 transitions. [2021-05-06 12:05:08,007 INFO L78 Accepts]: Start accepts. Automaton has 488 states and 493 transitions. Word has length 275 [2021-05-06 12:05:08,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:08,008 INFO L480 AbstractCegarLoop]: Abstraction has 488 states and 493 transitions. [2021-05-06 12:05:08,008 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 164 states, 164 states have (on average 1.6524390243902438) internal successors, (271), 163 states have internal predecessors, (271), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:08,008 INFO L276 IsEmpty]: Start isEmpty. Operand 488 states and 493 transitions. [2021-05-06 12:05:08,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 279 [2021-05-06 12:05:08,009 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:08,009 INFO L523 BasicCegarLoop]: trace histogram [105, 104, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:08,009 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable167 [2021-05-06 12:05:08,009 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:08,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:08,009 INFO L82 PathProgramCache]: Analyzing trace with hash 1118511873, now seen corresponding path program 56 times [2021-05-06 12:05:08,009 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:08,010 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [309449568] [2021-05-06 12:05:08,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:08,022 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:05:08,029 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:08,033 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:08,038 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:05:08,046 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:08,049 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:05:08,063 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:08,064 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:08,073 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:08,075 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:08,083 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:05:08,096 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:08,097 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:08,099 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:05:08,112 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:08,113 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:08,121 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:08,122 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:08,130 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:05:08,144 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:08,146 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:05:08,146 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:08,150 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:08,160 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:05:08,167 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:08,167 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:08,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:09,414 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:09,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:09,416 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:09,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:09,418 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:14,453 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:14,454 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [309449568] [2021-05-06 12:05:14,454 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [309449568] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:14,454 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:14,454 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [166] imperfect sequences [] total 166 [2021-05-06 12:05:14,454 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782990949] [2021-05-06 12:05:14,454 INFO L460 AbstractCegarLoop]: Interpolant automaton has 166 states [2021-05-06 12:05:14,454 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:14,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 166 interpolants. [2021-05-06 12:05:14,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8072, Invalid=19318, Unknown=0, NotChecked=0, Total=27390 [2021-05-06 12:05:14,456 INFO L87 Difference]: Start difference. First operand 488 states and 493 transitions. Second operand has 166 states, 166 states have (on average 1.6506024096385543) internal successors, (274), 165 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 12:05:35,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:35,063 INFO L93 Difference]: Finished difference Result 767 states and 783 transitions. [2021-05-06 12:05:35,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 166 states. [2021-05-06 12:05:35,064 INFO L78 Accepts]: Start accepts. Automaton has has 166 states, 166 states have (on average 1.6506024096385543) internal successors, (274), 165 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 12:05:35,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:35,065 INFO L225 Difference]: With dead ends: 767 [2021-05-06 12:05:35,065 INFO L226 Difference]: Without dead ends: 495 [2021-05-06 12:05:35,088 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 112 SyntacticMatches, 1 SemanticMatches, 327 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31228 ImplicationChecksByTransitivity, 18574.9ms TimeCoverageRelationStatistics Valid=24210, Invalid=83702, Unknown=0, NotChecked=0, Total=107912 [2021-05-06 12:05:35,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 495 states. [2021-05-06 12:05:35,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 495 to 287. [2021-05-06 12:05:35,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 287 states, 280 states have (on average 1.0178571428571428) internal successors, (285), 281 states have internal predecessors, (285), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:05:35,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 291 transitions. [2021-05-06 12:05:35,102 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 291 transitions. Word has length 278 [2021-05-06 12:05:35,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:35,102 INFO L480 AbstractCegarLoop]: Abstraction has 287 states and 291 transitions. [2021-05-06 12:05:35,102 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 166 states, 166 states have (on average 1.6506024096385543) internal successors, (274), 165 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 12:05:35,102 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 291 transitions. [2021-05-06 12:05:35,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 284 [2021-05-06 12:05:35,103 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:35,103 INFO L523 BasicCegarLoop]: trace histogram [107, 106, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:35,104 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable170 [2021-05-06 12:05:35,104 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:35,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:35,104 INFO L82 PathProgramCache]: Analyzing trace with hash -66775176, now seen corresponding path program 57 times [2021-05-06 12:05:35,104 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:35,104 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [631973566] [2021-05-06 12:05:35,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:35,112 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:05:35,112 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:35,116 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:35,124 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:05:35,131 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:35,133 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:05:35,146 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:35,147 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:35,154 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:35,156 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:35,164 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:05:35,177 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 12:05:35,178 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:35,184 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:05:35,184 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:35,185 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:35,192 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:05:35,194 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:05:35,212 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:05:35,226 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:35,228 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:05:35,229 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:35,232 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:05:35,241 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:05:35,248 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 12:05:35,248 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:35,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:36,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:36,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:36,604 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:36,604 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:36,605 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:41,850 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:41,850 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [631973566] [2021-05-06 12:05:41,850 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [631973566] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:41,851 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:41,851 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [169] imperfect sequences [] total 169 [2021-05-06 12:05:41,851 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677484580] [2021-05-06 12:05:41,851 INFO L460 AbstractCegarLoop]: Interpolant automaton has 169 states [2021-05-06 12:05:41,851 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:41,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 169 interpolants. [2021-05-06 12:05:41,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8359, Invalid=20033, Unknown=0, NotChecked=0, Total=28392 [2021-05-06 12:05:41,853 INFO L87 Difference]: Start difference. First operand 287 states and 291 transitions. Second operand has 169 states, 169 states have (on average 1.650887573964497) internal successors, (279), 168 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 12:06:03,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:03,412 INFO L93 Difference]: Finished difference Result 571 states and 584 transitions. [2021-05-06 12:06:03,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 169 states. [2021-05-06 12:06:03,412 INFO L78 Accepts]: Start accepts. Automaton has has 169 states, 169 states have (on average 1.650887573964497) internal successors, (279), 168 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 12:06:03,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:03,413 INFO L225 Difference]: With dead ends: 571 [2021-05-06 12:06:03,413 INFO L226 Difference]: Without dead ends: 292 [2021-05-06 12:06:03,417 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 448 GetRequests, 114 SyntacticMatches, 1 SemanticMatches, 333 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32384 ImplicationChecksByTransitivity, 19431.4ms TimeCoverageRelationStatistics Valid=25071, Invalid=86819, Unknown=0, NotChecked=0, Total=111890 [2021-05-06 12:06:03,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2021-05-06 12:06:03,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 292. [2021-05-06 12:06:03,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 285 states have (on average 1.0175438596491229) internal successors, (290), 286 states have internal predecessors, (290), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:03,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 296 transitions. [2021-05-06 12:06:03,430 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 296 transitions. Word has length 283 [2021-05-06 12:06:03,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:03,431 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 296 transitions. [2021-05-06 12:06:03,431 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 169 states, 169 states have (on average 1.650887573964497) internal successors, (279), 168 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 12:06:03,431 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 296 transitions. [2021-05-06 12:06:03,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 289 [2021-05-06 12:06:03,432 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:03,432 INFO L523 BasicCegarLoop]: trace histogram [109, 108, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:03,432 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable173 [2021-05-06 12:06:03,432 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:03,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:03,432 INFO L82 PathProgramCache]: Analyzing trace with hash -1595216203, now seen corresponding path program 58 times [2021-05-06 12:06:03,432 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:03,432 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [608544928] [2021-05-06 12:06:03,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:03,439 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:06:03,445 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:03,448 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:03,452 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:06:03,459 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:03,461 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:06:03,474 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:03,476 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:03,483 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:03,485 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:03,492 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:06:03,505 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 12:06:03,506 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:03,508 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:06:03,509 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:03,510 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:03,517 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:03,519 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:03,538 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:06:03,551 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:03,553 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:06:03,564 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:03,567 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:03,571 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:06:03,578 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:03,578 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:03,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:04,893 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:04,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:04,896 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:04,896 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:04,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:10,367 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:10,368 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [608544928] [2021-05-06 12:06:10,368 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [608544928] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:10,368 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:10,368 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [172] imperfect sequences [] total 172 [2021-05-06 12:06:10,368 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [906732923] [2021-05-06 12:06:10,368 INFO L460 AbstractCegarLoop]: Interpolant automaton has 172 states [2021-05-06 12:06:10,368 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:10,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 172 interpolants. [2021-05-06 12:06:10,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8651, Invalid=20761, Unknown=0, NotChecked=0, Total=29412 [2021-05-06 12:06:10,370 INFO L87 Difference]: Start difference. First operand 292 states and 296 transitions. Second operand has 172 states, 172 states have (on average 1.6511627906976745) internal successors, (284), 171 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 12:06:32,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:32,447 INFO L93 Difference]: Finished difference Result 581 states and 594 transitions. [2021-05-06 12:06:32,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 172 states. [2021-05-06 12:06:32,447 INFO L78 Accepts]: Start accepts. Automaton has has 172 states, 172 states have (on average 1.6511627906976745) internal successors, (284), 171 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 12:06:32,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:32,448 INFO L225 Difference]: With dead ends: 581 [2021-05-06 12:06:32,448 INFO L226 Difference]: Without dead ends: 297 [2021-05-06 12:06:32,451 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 456 GetRequests, 116 SyntacticMatches, 1 SemanticMatches, 339 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33561 ImplicationChecksByTransitivity, 19945.2ms TimeCoverageRelationStatistics Valid=25947, Invalid=89993, Unknown=0, NotChecked=0, Total=115940 [2021-05-06 12:06:32,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2021-05-06 12:06:32,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 297. [2021-05-06 12:06:32,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 297 states, 290 states have (on average 1.0172413793103448) internal successors, (295), 291 states have internal predecessors, (295), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:06:32,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 301 transitions. [2021-05-06 12:06:32,465 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 301 transitions. Word has length 288 [2021-05-06 12:06:32,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:32,465 INFO L480 AbstractCegarLoop]: Abstraction has 297 states and 301 transitions. [2021-05-06 12:06:32,465 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 172 states, 172 states have (on average 1.6511627906976745) internal successors, (284), 171 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 12:06:32,465 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 301 transitions. [2021-05-06 12:06:32,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 294 [2021-05-06 12:06:32,466 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:32,466 INFO L523 BasicCegarLoop]: trace histogram [111, 110, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:32,466 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable176 [2021-05-06 12:06:32,467 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:32,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:32,467 INFO L82 PathProgramCache]: Analyzing trace with hash -353917244, now seen corresponding path program 59 times [2021-05-06 12:06:32,467 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:32,467 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1819822577] [2021-05-06 12:06:32,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:32,480 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:06:32,481 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:32,484 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:32,493 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:06:32,499 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:32,502 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:06:32,503 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:32,504 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:32,511 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:32,512 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:32,530 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:06:32,543 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:32,544 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:32,546 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:06:32,559 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:32,560 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:32,568 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:06:32,570 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:06:32,578 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:06:32,591 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:32,593 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:06:32,599 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:32,603 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:06:32,606 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:06:32,613 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:32,614 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:32,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:33,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:33,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:33,971 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:33,971 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:33,972 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:39,588 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:39,588 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1819822577] [2021-05-06 12:06:39,588 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1819822577] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:39,588 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:39,588 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [175] imperfect sequences [] total 175 [2021-05-06 12:06:39,588 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717250049] [2021-05-06 12:06:39,589 INFO L460 AbstractCegarLoop]: Interpolant automaton has 175 states [2021-05-06 12:06:39,589 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:39,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 175 interpolants. [2021-05-06 12:06:39,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8948, Invalid=21502, Unknown=0, NotChecked=0, Total=30450 [2021-05-06 12:06:39,591 INFO L87 Difference]: Start difference. First operand 297 states and 301 transitions. Second operand has 175 states, 175 states have (on average 1.6514285714285715) internal successors, (289), 174 states have internal predecessors, (289), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:02,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:02,400 INFO L93 Difference]: Finished difference Result 591 states and 604 transitions. [2021-05-06 12:07:02,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 175 states. [2021-05-06 12:07:02,401 INFO L78 Accepts]: Start accepts. Automaton has has 175 states, 175 states have (on average 1.6514285714285715) internal successors, (289), 174 states have internal predecessors, (289), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 293 [2021-05-06 12:07:02,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:02,402 INFO L225 Difference]: With dead ends: 591 [2021-05-06 12:07:02,402 INFO L226 Difference]: Without dead ends: 302 [2021-05-06 12:07:02,405 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 464 GetRequests, 118 SyntacticMatches, 1 SemanticMatches, 345 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34759 ImplicationChecksByTransitivity, 20506.8ms TimeCoverageRelationStatistics Valid=26838, Invalid=93224, Unknown=0, NotChecked=0, Total=120062 [2021-05-06 12:07:02,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2021-05-06 12:07:02,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 302. [2021-05-06 12:07:02,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 302 states, 295 states have (on average 1.0169491525423728) internal successors, (300), 296 states have internal predecessors, (300), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:02,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 306 transitions. [2021-05-06 12:07:02,419 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 306 transitions. Word has length 293 [2021-05-06 12:07:02,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:02,419 INFO L480 AbstractCegarLoop]: Abstraction has 302 states and 306 transitions. [2021-05-06 12:07:02,419 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 175 states, 175 states have (on average 1.6514285714285715) internal successors, (289), 174 states have internal predecessors, (289), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:02,419 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 306 transitions. [2021-05-06 12:07:02,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2021-05-06 12:07:02,420 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:02,420 INFO L523 BasicCegarLoop]: trace histogram [113, 112, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:02,420 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable179 [2021-05-06 12:07:02,420 INFO L428 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:02,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:02,421 INFO L82 PathProgramCache]: Analyzing trace with hash -309578647, now seen corresponding path program 60 times [2021-05-06 12:07:02,421 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:02,421 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1287144984] [2021-05-06 12:07:02,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:02,428 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:07:02,429 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:02,432 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:07:02,441 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:07:02,447 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 12:07:02,450 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:07:02,463 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:02,464 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:02,472 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:02,473 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:02,481 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:07:02,494 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:02,495 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:02,497 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:07:02,498 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:02,499 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:02,513 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:02,515 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:02,534 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:07:02,547 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:02,550 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:07:02,550 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:02,553 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:07:02,562 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:07:02,568 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:02,569 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:02,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:04,078 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:04,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:04,080 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:04,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:09,881 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:09,881 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1287144984] [2021-05-06 12:07:09,881 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1287144984] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:09,881 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:09,882 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [178] imperfect sequences [] total 178 [2021-05-06 12:07:09,882 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940178238] [2021-05-06 12:07:09,882 INFO L460 AbstractCegarLoop]: Interpolant automaton has 178 states [2021-05-06 12:07:09,882 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:09,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 178 interpolants. [2021-05-06 12:07:09,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9499, Invalid=23081, Unknown=0, NotChecked=0, Total=32580 [2021-05-06 12:07:09,884 INFO L87 Difference]: Start difference. First operand 302 states and 306 transitions. Second operand has 178 states, 178 states have (on average 1.651685393258427) internal successors, (294), 177 states have internal predecessors, (294), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:33,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:33,708 INFO L93 Difference]: Finished difference Result 823 states and 836 transitions. [2021-05-06 12:07:33,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 178 states. [2021-05-06 12:07:33,709 INFO L78 Accepts]: Start accepts. Automaton has has 178 states, 178 states have (on average 1.651685393258427) internal successors, (294), 177 states have internal predecessors, (294), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 298 [2021-05-06 12:07:33,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:33,710 INFO L225 Difference]: With dead ends: 823 [2021-05-06 12:07:33,710 INFO L226 Difference]: Without dead ends: 529 [2021-05-06 12:07:33,714 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 474 GetRequests, 119 SyntacticMatches, 1 SemanticMatches, 354 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37133 ImplicationChecksByTransitivity, 21350.1ms TimeCoverageRelationStatistics Valid=27998, Invalid=98382, Unknown=0, NotChecked=0, Total=126380 [2021-05-06 12:07:33,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 529 states. [2021-05-06 12:07:33,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 529 to 529. [2021-05-06 12:07:33,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 529 states, 522 states have (on average 1.0114942528735633) internal successors, (528), 523 states have internal predecessors, (528), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 12:07:33,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 529 states to 529 states and 534 transitions. [2021-05-06 12:07:33,738 INFO L78 Accepts]: Start accepts. Automaton has 529 states and 534 transitions. Word has length 298 [2021-05-06 12:07:33,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:33,739 INFO L480 AbstractCegarLoop]: Abstraction has 529 states and 534 transitions. [2021-05-06 12:07:33,739 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 178 states, 178 states have (on average 1.651685393258427) internal successors, (294), 177 states have internal predecessors, (294), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:33,739 INFO L276 IsEmpty]: Start isEmpty. Operand 529 states and 534 transitions. [2021-05-06 12:07:33,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 302 [2021-05-06 12:07:33,740 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:33,740 INFO L523 BasicCegarLoop]: trace histogram [114, 113, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:33,740 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable182 [2021-05-06 12:07:33,740 INFO L428 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:33,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:33,740 INFO L82 PathProgramCache]: Analyzing trace with hash -308257355, now seen corresponding path program 61 times [2021-05-06 12:07:33,740 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:33,740 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1987507758] [2021-05-06 12:07:33,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:33,756 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size [2021-05-06 12:07:33,763 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:33,767 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:07:33,771 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 93.3 percent of original size 42 [2021-05-06 12:07:33,780 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:33,782 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:07:33,796 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:33,797 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:33,804 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:33,806 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:33,815 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:07:33,830 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:33,831 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:33,833 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size [2021-05-06 12:07:33,834 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:33,835 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:33,844 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 31 [2021-05-06 12:07:33,846 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-05-06 12:07:33,865 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.3 percent of original size 66 [2021-05-06 12:07:33,879 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 12:07:33,882 WARN L240 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size [2021-05-06 12:07:33,887 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:33,891 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 15 [2021-05-06 12:07:33,895 WARN L245 tifierPushTermWalker]: treesize reduction 17, result has 71.2 percent of original size 42 [2021-05-06 12:07:33,902 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:33,902 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:33,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:35,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:35,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:35,360 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:35,365 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:35,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:41,231 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:41,231 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1987507758] [2021-05-06 12:07:41,231 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1987507758] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:41,231 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:41,231 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [180] imperfect sequences [] total 180 [2021-05-06 12:07:41,231 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153186340] [2021-05-06 12:07:41,232 INFO L460 AbstractCegarLoop]: Interpolant automaton has 180 states [2021-05-06 12:07:41,232 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:41,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 180 interpolants. [2021-05-06 12:07:41,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9492, Invalid=22728, Unknown=0, NotChecked=0, Total=32220 [2021-05-06 12:07:41,234 INFO L87 Difference]: Start difference. First operand 529 states and 534 transitions. Second operand has 180 states, 180 states have (on average 1.65) internal successors, (297), 179 states have internal predecessors, (297), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)