/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_11.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 11:54:58,616 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 11:54:58,618 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 11:54:58,650 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 11:54:58,692 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 11:54:58,692 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 11:54:58,693 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 11:54:58,696 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 11:54:58,708 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 11:54:58,708 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 11:54:58,710 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 11:54:58,711 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 11:54:58,711 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 11:54:58,711 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 11:54:58,711 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 11:54:58,711 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 11:54:58,711 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 11:54:58,711 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 11:54:58,712 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 11:54:58,712 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 11:54:58,712 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 11:54:58,712 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 11:54:58,712 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 11:54:58,713 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 11:54:58,713 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 11:54:58,713 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 11:54:58,713 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:54:58,713 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 11:54:58,713 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 11:54:58,713 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 11:54:58,713 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 11:54:58,713 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 11:54:58,949 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 11:54:58,968 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 11:54:58,970 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 11:54:58,971 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 11:54:58,971 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 11:54:58,972 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_11.c [2021-05-06 11:54:59,013 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fdd1e4b02/68b550112db5486082ef0845cf733221/FLAG05e13f97d [2021-05-06 11:54:59,394 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 11:54:59,395 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_11.c [2021-05-06 11:54:59,399 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fdd1e4b02/68b550112db5486082ef0845cf733221/FLAG05e13f97d [2021-05-06 11:54:59,412 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fdd1e4b02/68b550112db5486082ef0845cf733221 [2021-05-06 11:54:59,413 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 11:54:59,415 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 11:54:59,418 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 11:54:59,419 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 11:54:59,421 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 11:54:59,422 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:54:59" (1/1) ... [2021-05-06 11:54:59,422 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5ccce79e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:54:59, skipping insertion in model container [2021-05-06 11:54:59,422 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:54:59" (1/1) ... [2021-05-06 11:54:59,426 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 11:54:59,435 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 11:54:59,541 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_11.c[319,332] [2021-05-06 11:54:59,553 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:54:59,559 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 11:54:59,582 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_11.c[319,332] [2021-05-06 11:54:59,583 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:54:59,607 INFO L208 MainTranslator]: Completed translation [2021-05-06 11:54:59,607 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:54:59 WrapperNode [2021-05-06 11:54:59,608 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 11:54:59,608 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 11:54:59,609 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 11:54:59,609 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 11:54:59,616 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:54:59" (1/1) ... [2021-05-06 11:54:59,616 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:54:59" (1/1) ... [2021-05-06 11:54:59,621 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:54:59" (1/1) ... [2021-05-06 11:54:59,622 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:54:59" (1/1) ... [2021-05-06 11:54:59,631 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:54:59" (1/1) ... [2021-05-06 11:54:59,635 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:54:59" (1/1) ... [2021-05-06 11:54:59,637 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:54:59" (1/1) ... [2021-05-06 11:54:59,640 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 11:54:59,641 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 11:54:59,641 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 11:54:59,641 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 11:54:59,641 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:54:59" (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 11:54:59,821 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 11:54:59,821 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 11:54:59,821 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 11:54:59,821 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 11:54:59,821 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 11:54:59,821 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 11:54:59,822 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 11:54:59,822 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 11:54:59,822 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 11:54:59,822 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 11:54:59,823 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 11:54:59,823 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 11:54:59,823 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 11:54:59,823 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 11:54:59,823 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 11:54:59,823 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 11:54:59,823 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 11:55:00,032 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 11:55:00,035 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 11:55:00,036 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:55:00 BoogieIcfgContainer [2021-05-06 11:55:00,036 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 11:55:00,037 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 11:55:00,038 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 11:55:00,039 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 11:55:00,040 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 11:54:59" (1/3) ... [2021-05-06 11:55:00,040 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7169b3ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:55:00, skipping insertion in model container [2021-05-06 11:55:00,040 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:54:59" (2/3) ... [2021-05-06 11:55:00,040 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7169b3ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:55:00, skipping insertion in model container [2021-05-06 11:55:00,040 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:55:00" (3/3) ... [2021-05-06 11:55:00,041 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_11.c [2021-05-06 11:55:00,045 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 11:55:00,047 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 11:55:00,079 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 11:55:00,104 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 11:55:00,104 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 11:55:00,104 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 11:55:00,104 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 11:55:00,104 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 11:55:00,104 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 11:55:00,105 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 11:55:00,105 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 11:55:00,129 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:55:00,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 11:55:00,134 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:00,134 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:00,135 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:00,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:00,138 INFO L82 PathProgramCache]: Analyzing trace with hash 1325153485, now seen corresponding path program 1 times [2021-05-06 11:55:00,143 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:00,143 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [60572568] [2021-05-06 11:55:00,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:00,199 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:55:00,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:00,347 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:00,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:00,370 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:00,371 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:00,372 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [60572568] [2021-05-06 11:55:00,373 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [60572568] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:00,373 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:00,373 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 11:55:00,374 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1251070316] [2021-05-06 11:55:00,377 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 11:55:00,377 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:00,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 11:55:00,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:55:00,386 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:00,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:00,444 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2021-05-06 11:55:00,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 11:55:00,446 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-06 11:55:00,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:00,449 INFO L225 Difference]: With dead ends: 32 [2021-05-06 11:55:00,450 INFO L226 Difference]: Without dead ends: 13 [2021-05-06 11:55:00,452 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 41.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:55:00,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-05-06 11:55:00,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-05-06 11:55:00,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:00,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-05-06 11:55:00,478 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2021-05-06 11:55:00,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:00,479 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-05-06 11:55:00,479 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:00,479 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-05-06 11:55:00,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 11:55:00,480 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:00,480 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:00,481 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 11:55:00,481 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:00,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:00,481 INFO L82 PathProgramCache]: Analyzing trace with hash 1315918275, now seen corresponding path program 1 times [2021-05-06 11:55:00,482 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:00,482 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [763739590] [2021-05-06 11:55:00,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:00,490 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:55:00,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:00,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:00,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:00,591 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:00,591 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:00,592 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [763739590] [2021-05-06 11:55:00,592 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [763739590] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:00,593 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:00,593 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 11:55:00,593 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936369034] [2021-05-06 11:55:00,593 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 11:55:00,594 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:00,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 11:55:00,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 11:55:00,595 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:00,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:00,649 INFO L93 Difference]: Finished difference Result 22 states and 26 transitions. [2021-05-06 11:55:00,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 11:55:00,650 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-06 11:55:00,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:00,650 INFO L225 Difference]: With dead ends: 22 [2021-05-06 11:55:00,650 INFO L226 Difference]: Without dead ends: 15 [2021-05-06 11:55:00,652 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 42.8ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:55:00,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-06 11:55:00,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-05-06 11:55:00,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:00,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-05-06 11:55:00,665 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2021-05-06 11:55:00,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:00,665 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-05-06 11:55:00,665 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:00,666 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-05-06 11:55:00,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-06 11:55:00,667 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:00,667 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:00,668 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 11:55:00,668 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:00,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:00,668 INFO L82 PathProgramCache]: Analyzing trace with hash -1372110560, now seen corresponding path program 1 times [2021-05-06 11:55:00,669 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:00,669 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1177613923] [2021-05-06 11:55:00,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:00,707 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:55:00,724 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:00,753 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:55:00,767 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:55:00,787 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:00,794 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2021-05-06 11:55:00,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:00,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:00,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:00,897 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 11:55:00,958 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:00,958 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1177613923] [2021-05-06 11:55:00,958 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1177613923] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:00,958 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:00,959 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 11:55:00,959 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105818938] [2021-05-06 11:55:00,959 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 11:55:00,959 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:00,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 11:55:00,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:55:00,960 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:01,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:01,066 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2021-05-06 11:55:01,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 11:55:01,067 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-05-06 11:55:01,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:01,067 INFO L225 Difference]: With dead ends: 22 [2021-05-06 11:55:01,067 INFO L226 Difference]: Without dead ends: 17 [2021-05-06 11:55:01,068 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 151.3ms TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:55:01,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-06 11:55:01,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-06 11:55:01,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:01,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-05-06 11:55:01,074 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 13 [2021-05-06 11:55:01,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:01,075 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-05-06 11:55:01,075 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:01,075 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-05-06 11:55:01,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-06 11:55:01,075 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:01,075 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:01,075 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 11:55:01,075 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:01,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:01,076 INFO L82 PathProgramCache]: Analyzing trace with hash 1059749499, now seen corresponding path program 1 times [2021-05-06 11:55:01,076 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:01,076 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [332213001] [2021-05-06 11:55:01,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:01,090 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:55:01,093 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:01,108 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:55:01,134 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:55:01,149 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:01,165 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:55:01,176 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:01,183 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:05,241 WARN L205 SmtUtils]: Spent 4.04 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:55:09,356 WARN L205 SmtUtils]: Spent 4.11 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:55:13,388 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:55:17,403 WARN L205 SmtUtils]: Spent 4.01 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:55:21,420 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification that was a NOOP. DAG size: 22 [2021-05-06 11:55:25,449 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 11:55:29,463 WARN L205 SmtUtils]: Spent 4.01 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:55:29,605 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:55:29,689 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:55:29,740 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:55:29,820 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:29,822 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:29,826 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:55:29,841 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:29,844 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:32,547 WARN L205 SmtUtils]: Spent 2.62 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:55:32,565 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:55:32,569 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:55:32,580 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:55:32,607 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:32,608 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:32,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:32,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:32,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:32,843 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:32,848 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:33,016 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:33,016 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [332213001] [2021-05-06 11:55:33,016 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [332213001] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:33,016 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:33,016 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:55:33,017 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [617810888] [2021-05-06 11:55:33,017 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:55:33,017 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:33,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:55:33,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:55:33,017 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:33,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:33,308 INFO L93 Difference]: Finished difference Result 31 states and 38 transitions. [2021-05-06 11:55:33,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:55:33,308 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-06 11:55:33,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:33,309 INFO L225 Difference]: With dead ends: 31 [2021-05-06 11:55:33,309 INFO L226 Difference]: Without dead ends: 21 [2021-05-06 11:55:33,309 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 392.2ms TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:55:33,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-06 11:55:33,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-05-06 11:55:33,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.25) internal successors, (20), 16 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:33,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2021-05-06 11:55:33,313 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 15 [2021-05-06 11:55:33,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:33,313 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2021-05-06 11:55:33,313 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:33,313 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2021-05-06 11:55:33,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-06 11:55:33,314 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:33,314 INFO L523 BasicCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:33,314 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-06 11:55:33,314 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:33,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:33,314 INFO L82 PathProgramCache]: Analyzing trace with hash -1662437453, now seen corresponding path program 2 times [2021-05-06 11:55:33,314 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:33,314 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1274589340] [2021-05-06 11:55:33,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:33,323 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:55:33,324 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:33,335 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:55:33,353 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:55:33,366 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:33,375 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:55:33,377 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:33,379 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:33,486 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:55:33,490 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:55:33,528 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:55:33,575 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:33,587 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:33,592 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 11:55:33,603 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:33,608 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:33,947 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 11:55:33,981 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 11:55:34,273 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 11:55:34,594 WARN L205 SmtUtils]: Spent 320.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:55:34,595 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:34,599 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:55:34,600 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:34,602 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:34,699 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:55:34,703 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:55:34,726 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:55:34,740 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:34,741 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:34,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:34,878 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:34,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:34,888 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:34,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:35,107 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:35,108 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1274589340] [2021-05-06 11:55:35,108 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1274589340] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:35,108 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:35,108 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:55:35,108 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398484585] [2021-05-06 11:55:35,108 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:55:35,108 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:35,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:55:35,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:55:35,109 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 10 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 11:55:35,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:55:35,376 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2021-05-06 11:55:35,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:55:35,382 INFO L78 Accepts]: Start accepts. Automaton has has 10 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 11:55:35,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:55:35,383 INFO L225 Difference]: With dead ends: 30 [2021-05-06 11:55:35,383 INFO L226 Difference]: Without dead ends: 23 [2021-05-06 11:55:35,383 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 6 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 434.7ms TimeCoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:55:35,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-06 11:55:35,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-06 11:55:35,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 18 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:35,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2021-05-06 11:55:35,387 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 19 [2021-05-06 11:55:35,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:55:35,387 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2021-05-06 11:55:35,387 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 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 11:55:35,387 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2021-05-06 11:55:35,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-06 11:55:35,388 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:55:35,388 INFO L523 BasicCegarLoop]: trace histogram [5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:55:35,388 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-06 11:55:35,388 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:55:35,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:55:35,388 INFO L82 PathProgramCache]: Analyzing trace with hash 361874638, now seen corresponding path program 3 times [2021-05-06 11:55:35,388 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:55:35,389 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [658599364] [2021-05-06 11:55:35,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:55:35,397 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:55:35,398 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:35,408 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:55:35,429 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:55:35,440 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:35,448 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:55:35,458 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:35,460 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:35,913 WARN L205 SmtUtils]: Spent 449.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:55:35,956 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:55:35,960 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:55:35,984 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:55:36,037 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:36,039 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:36,046 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 11:55:36,047 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:36,049 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:38,131 WARN L205 SmtUtils]: Spent 2.08 s on a formula simplification that was a NOOP. DAG size: 22 [2021-05-06 11:55:38,622 WARN L205 SmtUtils]: Spent 278.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:55:39,059 WARN L205 SmtUtils]: Spent 312.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:55:39,122 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 11:55:39,200 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 11:55:39,362 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 11:55:39,663 WARN L205 SmtUtils]: Spent 300.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:55:39,664 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:39,690 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:55:39,692 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:39,696 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:55:39,729 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:55:39,733 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:55:39,758 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:55:39,771 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:55:39,772 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:55:39,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:39,954 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:55:39,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:55:39,960 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:55:39,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:42,756 WARN L205 SmtUtils]: Spent 2.79 s on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:55:53,356 WARN L205 SmtUtils]: Spent 2.10 s on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:55:53,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:55:57,901 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 23 [2021-05-06 11:55:58,345 WARN L205 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:55:58,647 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:55:58,767 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:55:58,767 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [658599364] [2021-05-06 11:55:58,767 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [658599364] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:55:58,767 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:55:58,768 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 11:55:58,768 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302066745] [2021-05-06 11:55:58,768 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 11:55:58,768 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:55:58,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 11:55:58,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=136, Unknown=5, NotChecked=0, Total=182 [2021-05-06 11:55:58,769 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 12 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:55:59,301 WARN L205 SmtUtils]: Spent 401.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 48 [2021-05-06 11:56:04,137 WARN L205 SmtUtils]: Spent 187.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:56:08,925 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:56:09,182 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:56:09,540 WARN L205 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:56:09,776 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 11:56:09,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:56:09,872 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2021-05-06 11:56:09,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:56:09,873 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-05-06 11:56:09,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:56:09,873 INFO L225 Difference]: With dead ends: 32 [2021-05-06 11:56:09,873 INFO L226 Difference]: Without dead ends: 25 [2021-05-06 11:56:09,874 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 6 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 20065.5ms TimeCoverageRelationStatistics Valid=81, Invalid=293, Unknown=6, NotChecked=0, Total=380 [2021-05-06 11:56:09,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-06 11:56:09,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-05-06 11:56:09,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.2) internal successors, (24), 20 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:09,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-05-06 11:56:09,893 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 21 [2021-05-06 11:56:09,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:56:09,893 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-05-06 11:56:09,894 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:56:09,894 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-05-06 11:56:09,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-06 11:56:09,894 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:56:09,894 INFO L523 BasicCegarLoop]: trace histogram [6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:56:09,894 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-06 11:56:09,894 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:56:09,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:56:09,895 INFO L82 PathProgramCache]: Analyzing trace with hash 105609001, now seen corresponding path program 4 times [2021-05-06 11:56:09,895 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:56:09,895 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [819670794] [2021-05-06 11:56:09,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:56:09,941 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:56:09,982 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:10,025 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:56:10,055 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:56:10,136 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:10,152 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:56:10,153 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:10,155 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:14,178 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification that was a NOOP. DAG size: 23 [2021-05-06 11:56:18,207 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:56:22,236 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:56:26,258 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:56:30,285 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 23 DAG size of output: 1 [2021-05-06 11:56:30,402 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:56:30,770 WARN L205 SmtUtils]: Spent 336.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 11:56:30,771 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:56:30,871 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:56:31,079 WARN L205 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 11:56:31,080 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:31,081 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:56:31,087 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 11:56:31,334 WARN L205 SmtUtils]: Spent 225.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2021-05-06 11:56:31,344 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:31,345 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:35,373 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:56:39,393 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:56:43,413 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:56:47,501 WARN L205 SmtUtils]: Spent 4.09 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:56:49,668 WARN L205 SmtUtils]: Spent 2.07 s on a formula simplification that was a NOOP. DAG size: 22 [2021-05-06 11:56:50,108 WARN L205 SmtUtils]: Spent 439.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 11:56:50,361 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 11:56:50,661 WARN L205 SmtUtils]: Spent 299.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2021-05-06 11:56:50,683 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 11:56:50,821 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2021-05-06 11:56:50,938 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 11:56:51,394 WARN L205 SmtUtils]: Spent 455.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:56:51,394 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:56:51,401 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:56:51,457 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:51,459 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:56:55,477 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:56:58,667 WARN L205 SmtUtils]: Spent 3.19 s on a formula simplification that was a NOOP. DAG size: 15 [2021-05-06 11:57:02,682 WARN L205 SmtUtils]: Spent 4.01 s on a formula simplification. DAG size of input: 15 DAG size of output: 1 [2021-05-06 11:57:02,728 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:57:02,746 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:57:02,777 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:57:02,857 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:02,858 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:02,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:03,123 WARN L205 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 16 [2021-05-06 11:57:03,275 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2021-05-06 11:57:03,536 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:03,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:03,545 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:03,547 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:03,673 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 13 [2021-05-06 11:57:04,091 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 23 [2021-05-06 11:57:04,619 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:57:04,918 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:57:05,037 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:05,037 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [819670794] [2021-05-06 11:57:05,038 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [819670794] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:05,038 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:05,038 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 11:57:05,038 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666319027] [2021-05-06 11:57:05,038 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 11:57:05,038 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:05,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 11:57:05,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:57:05,039 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:05,300 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-06 11:57:05,559 WARN L205 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-06 11:57:05,835 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:57:06,115 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:57:06,413 WARN L205 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:57:06,683 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:57:06,921 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 11:57:07,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:07,059 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2021-05-06 11:57:07,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 11:57:07,059 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-06 11:57:07,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:07,060 INFO L225 Difference]: With dead ends: 34 [2021-05-06 11:57:07,060 INFO L226 Difference]: Without dead ends: 27 [2021-05-06 11:57:07,060 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 8 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 3318.9ms TimeCoverageRelationStatistics Valid=86, Invalid=334, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:57:07,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-06 11:57:07,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-05-06 11:57:07,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 22 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:07,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2021-05-06 11:57:07,064 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 23 [2021-05-06 11:57:07,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:07,064 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2021-05-06 11:57:07,064 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:07,064 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2021-05-06 11:57:07,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-06 11:57:07,065 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:07,065 INFO L523 BasicCegarLoop]: trace histogram [7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:07,065 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-06 11:57:07,065 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:07,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:07,065 INFO L82 PathProgramCache]: Analyzing trace with hash -1352532284, now seen corresponding path program 5 times [2021-05-06 11:57:07,065 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:07,065 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [953862174] [2021-05-06 11:57:07,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:07,118 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:57:07,118 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:07,158 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:57:07,228 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:57:07,310 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 11:57:07,317 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:57:07,362 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:07,364 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:11,395 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:57:15,421 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:57:19,458 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:57:23,480 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 23 DAG size of output: 1 [2021-05-06 11:57:27,499 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification that was a NOOP. DAG size: 23 [2021-05-06 11:57:27,783 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:57:27,784 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:57:27,916 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2021-05-06 11:57:28,822 WARN L205 SmtUtils]: Spent 905.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 11:57:28,823 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:57:28,895 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:57:29,071 WARN L205 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2021-05-06 11:57:29,071 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:29,077 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:29,081 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 11:57:29,102 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:29,104 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:29,324 WARN L205 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:57:29,465 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 1 [2021-05-06 11:57:29,630 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 1 [2021-05-06 11:57:29,880 WARN L205 SmtUtils]: Spent 196.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2021-05-06 11:57:30,145 WARN L205 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:57:30,349 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:57:30,610 WARN L205 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:57:30,639 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 11:57:30,681 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 11:57:30,884 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2021-05-06 11:57:30,994 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 11:57:31,232 WARN L205 SmtUtils]: Spent 237.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:57:31,232 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:31,236 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:57:31,290 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:31,292 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:35,315 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:57:39,332 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 15 DAG size of output: 1 [2021-05-06 11:57:41,763 WARN L205 SmtUtils]: Spent 2.43 s on a formula simplification that was a NOOP. DAG size: 15 [2021-05-06 11:57:41,807 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:57:41,823 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:57:41,856 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:57:41,929 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:41,930 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:41,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:42,090 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 14 [2021-05-06 11:57:42,219 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 11 [2021-05-06 11:57:42,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:42,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:42,479 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:42,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:42,626 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 13 [2021-05-06 11:57:42,993 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 23 [2021-05-06 11:57:43,493 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:57:44,216 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:44,216 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [953862174] [2021-05-06 11:57:44,217 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [953862174] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:44,217 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:44,217 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:57:44,217 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628852806] [2021-05-06 11:57:44,217 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:57:44,217 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:44,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:57:44,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:57:44,218 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 13 states, 12 states have (on average 1.75) internal successors, (21), 11 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:44,495 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2021-05-06 11:57:44,740 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:57:45,062 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:57:45,356 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:57:45,640 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:57:45,932 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:57:46,217 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:57:46,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:57:46,691 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2021-05-06 11:57:46,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:57:46,691 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.75) internal successors, (21), 11 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-05-06 11:57:46,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:57:46,692 INFO L225 Difference]: With dead ends: 36 [2021-05-06 11:57:46,692 INFO L226 Difference]: Without dead ends: 29 [2021-05-06 11:57:46,692 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 9 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 3534.2ms TimeCoverageRelationStatistics Valid=97, Invalid=409, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:57:46,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-06 11:57:46,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-05-06 11:57:46,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.1666666666666667) internal successors, (28), 24 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:46,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2021-05-06 11:57:46,696 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 25 [2021-05-06 11:57:46,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:57:46,696 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2021-05-06 11:57:46,696 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 1.75) internal successors, (21), 11 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:46,696 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2021-05-06 11:57:46,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-06 11:57:46,698 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:57:46,698 INFO L523 BasicCegarLoop]: trace histogram [8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:57:46,698 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-05-06 11:57:46,698 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:57:46,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:57:46,698 INFO L82 PathProgramCache]: Analyzing trace with hash 1827998623, now seen corresponding path program 6 times [2021-05-06 11:57:46,699 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:57:46,699 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1995973057] [2021-05-06 11:57:46,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:57:46,723 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:57:46,755 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:46,789 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:57:46,818 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:57:46,894 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:46,902 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:57:46,904 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:46,905 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:47,473 WARN L205 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:57:47,479 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:57:47,490 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:57:47,581 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:57:47,789 WARN L205 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 11:57:47,789 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:47,790 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:47,793 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 11:57:47,793 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:47,797 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:48,242 WARN L205 SmtUtils]: Spent 408.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 1 [2021-05-06 11:57:48,492 WARN L205 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 1 [2021-05-06 11:57:48,714 WARN L205 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:57:48,841 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2021-05-06 11:57:51,303 WARN L205 SmtUtils]: Spent 2.46 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:57:52,222 WARN L205 SmtUtils]: Spent 918.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:57:52,626 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:57:52,627 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 11:57:52,706 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 11:57:52,900 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 11:57:53,305 WARN L205 SmtUtils]: Spent 404.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:57:53,305 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:57:53,308 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:57:53,309 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:53,310 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:57:55,739 WARN L205 SmtUtils]: Spent 2.37 s on a formula simplification. DAG size of input: 14 DAG size of output: 1 [2021-05-06 11:57:55,849 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:57:55,857 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:57:55,868 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:57:55,952 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:57:56,034 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 11:57:56,036 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:57:56,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:56,348 WARN L205 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2021-05-06 11:57:56,502 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2021-05-06 11:57:56,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:57:56,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:57:56,756 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:57:56,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:57:57,062 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 16 [2021-05-06 11:57:57,301 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2021-05-06 11:57:58,790 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:57:58,791 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1995973057] [2021-05-06 11:57:58,791 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1995973057] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:57:58,791 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:57:58,791 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:57:58,791 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1752510173] [2021-05-06 11:57:58,791 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:57:58,791 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:57:58,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:57:58,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:57:58,792 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand has 14 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:57:59,199 WARN L205 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 44 [2021-05-06 11:57:59,442 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:57:59,730 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:58:00,037 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:58:00,353 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:58:00,647 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:58:00,949 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:58:01,269 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 11:58:01,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:01,663 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2021-05-06 11:58:01,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 11:58:01,663 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2021-05-06 11:58:01,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:01,664 INFO L225 Difference]: With dead ends: 38 [2021-05-06 11:58:01,664 INFO L226 Difference]: Without dead ends: 31 [2021-05-06 11:58:01,665 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 10 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 4387.1ms TimeCoverageRelationStatistics Valid=108, Invalid=492, Unknown=0, NotChecked=0, Total=600 [2021-05-06 11:58:01,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-06 11:58:01,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-05-06 11:58:01,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 26 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:01,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2021-05-06 11:58:01,670 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 27 [2021-05-06 11:58:01,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:01,670 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2021-05-06 11:58:01,670 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:01,670 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2021-05-06 11:58:01,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-06 11:58:01,670 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:01,670 INFO L523 BasicCegarLoop]: trace histogram [9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:01,670 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-05-06 11:58:01,671 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:01,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:01,671 INFO L82 PathProgramCache]: Analyzing trace with hash 301485498, now seen corresponding path program 7 times [2021-05-06 11:58:01,671 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:01,671 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1010247621] [2021-05-06 11:58:01,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:01,697 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:58:01,698 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:01,736 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:58:01,800 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:58:01,875 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:01,882 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:58:01,916 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:01,920 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:05,950 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 11:58:09,969 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:58:13,985 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:58:18,007 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:58:22,026 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:58:26,049 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification that was a NOOP. DAG size: 22 [2021-05-06 11:58:30,071 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:58:30,838 WARN L205 SmtUtils]: Spent 682.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2021-05-06 11:58:30,877 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:58:31,943 WARN L205 SmtUtils]: Spent 1.05 s on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 11:58:31,944 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:58:32,003 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:58:32,115 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 11:58:32,116 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:32,117 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:32,119 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 11:58:32,120 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:32,137 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:36,166 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 23 DAG size of output: 1 [2021-05-06 11:58:36,314 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:58:38,492 WARN L205 SmtUtils]: Spent 2.18 s on a formula simplification that was a NOOP. DAG size: 24 [2021-05-06 11:58:38,718 WARN L205 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:58:38,846 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:58:39,038 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 11:58:39,096 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 11:58:39,405 WARN L205 SmtUtils]: Spent 271.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2021-05-06 11:58:39,576 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 11:58:39,888 WARN L205 SmtUtils]: Spent 311.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:58:39,888 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:39,892 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:58:39,892 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:39,901 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:43,916 WARN L205 SmtUtils]: Spent 4.01 s on a formula simplification that was a NOOP. DAG size: 15 [2021-05-06 11:58:47,934 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 15 DAG size of output: 1 [2021-05-06 11:58:51,965 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:58:52,029 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:58:52,045 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:58:52,121 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:58:52,197 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:52,198 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:52,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:52,360 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 11:58:52,512 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2021-05-06 11:58:52,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:58:52,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:58:52,762 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:58:52,764 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:58:52,897 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2021-05-06 11:58:53,273 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 23 [2021-05-06 11:58:53,775 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:58:54,071 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:58:54,392 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:58:54,750 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:58:55,268 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:58:55,268 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1010247621] [2021-05-06 11:58:55,268 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1010247621] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:58:55,268 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:58:55,268 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:58:55,268 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537502363] [2021-05-06 11:58:55,268 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:58:55,268 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:58:55,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:58:55,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:58:55,269 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand has 15 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 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 11:58:55,540 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-06 11:58:55,787 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-06 11:58:56,083 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:58:56,421 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:58:56,735 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:58:57,039 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:58:57,352 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:58:57,666 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:58:57,970 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:58:58,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:58:58,338 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2021-05-06 11:58:58,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:58:58,338 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 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 11:58:58,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:58:58,339 INFO L225 Difference]: With dead ends: 40 [2021-05-06 11:58:58,339 INFO L226 Difference]: Without dead ends: 33 [2021-05-06 11:58:58,340 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 11 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 4810.4ms TimeCoverageRelationStatistics Valid=119, Invalid=583, Unknown=0, NotChecked=0, Total=702 [2021-05-06 11:58:58,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-06 11:58:58,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-05-06 11:58:58,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 28 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:58:58,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 36 transitions. [2021-05-06 11:58:58,344 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 36 transitions. Word has length 29 [2021-05-06 11:58:58,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:58:58,344 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 36 transitions. [2021-05-06 11:58:58,344 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 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 11:58:58,344 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 36 transitions. [2021-05-06 11:58:58,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-06 11:58:58,344 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:58:58,344 INFO L523 BasicCegarLoop]: trace histogram [10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:58:58,344 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-05-06 11:58:58,345 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:58:58,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:58:58,345 INFO L82 PathProgramCache]: Analyzing trace with hash -2093779691, now seen corresponding path program 8 times [2021-05-06 11:58:58,345 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:58:58,345 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2058652140] [2021-05-06 11:58:58,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:58:58,373 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:58:58,411 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:58,448 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:58:58,480 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:58:58,554 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:58,561 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:58:58,562 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:58,563 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:58,991 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 11:58:59,003 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 11:58:59,105 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 11:58:59,224 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 11:58:59,224 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:58:59,226 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:58:59,229 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 11:58:59,236 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:58:59,238 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:03,277 WARN L205 SmtUtils]: Spent 4.04 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:59:07,336 WARN L205 SmtUtils]: Spent 4.06 s on a formula simplification that was a NOOP. DAG size: 23 [2021-05-06 11:59:11,361 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:59:15,388 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:59:19,412 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 23 DAG size of output: 1 [2021-05-06 11:59:19,526 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:59:19,739 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 1 [2021-05-06 11:59:19,863 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:59:19,864 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 11:59:20,237 WARN L205 SmtUtils]: Spent 373.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2021-05-06 11:59:20,347 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2021-05-06 11:59:20,348 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 11:59:22,573 WARN L205 SmtUtils]: Spent 2.02 s on a formula simplification that was a NOOP. DAG size: 7 [2021-05-06 11:59:22,606 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 11:59:22,925 WARN L205 SmtUtils]: Spent 318.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 11:59:22,925 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:22,929 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 11:59:22,978 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:22,980 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:27,003 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 15 DAG size of output: 1 [2021-05-06 11:59:31,017 WARN L205 SmtUtils]: Spent 4.01 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 11:59:33,510 WARN L205 SmtUtils]: Spent 2.49 s on a formula simplification that was a NOOP. DAG size: 15 [2021-05-06 11:59:33,547 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 11:59:33,564 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 11:59:33,595 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 11:59:33,669 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:33,670 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 11:59:33,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:33,866 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 14 [2021-05-06 11:59:34,008 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2021-05-06 11:59:34,244 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:59:34,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:59:34,247 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:59:34,249 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 11:59:34,403 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2021-05-06 11:59:34,747 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 22 [2021-05-06 11:59:35,012 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:59:35,567 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:59:36,270 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:59:36,664 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 11:59:37,213 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:59:37,214 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2058652140] [2021-05-06 11:59:37,214 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2058652140] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:59:37,214 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:59:37,214 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:59:37,214 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229751341] [2021-05-06 11:59:37,214 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:59:37,214 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:59:37,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:59:37,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:59:37,215 INFO L87 Difference]: Start difference. First operand 33 states and 36 transitions. Second operand has 16 states, 15 states have (on average 1.8) internal successors, (27), 14 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:37,519 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-06 11:59:37,760 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-06 11:59:38,054 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:59:38,390 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:59:38,711 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:59:39,021 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:59:39,358 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:59:39,678 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:59:40,034 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:59:40,360 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 11:59:40,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:59:40,756 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2021-05-06 11:59:40,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 11:59:40,756 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.8) internal successors, (27), 14 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-06 11:59:40,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:59:40,757 INFO L225 Difference]: With dead ends: 42 [2021-05-06 11:59:40,757 INFO L226 Difference]: Without dead ends: 35 [2021-05-06 11:59:40,757 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 12 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 5526.7ms TimeCoverageRelationStatistics Valid=130, Invalid=682, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:59:40,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-06 11:59:40,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-06 11:59:40,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 30 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:40,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2021-05-06 11:59:40,761 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 31 [2021-05-06 11:59:40,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:59:40,761 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2021-05-06 11:59:40,761 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 1.8) internal successors, (27), 14 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:59:40,761 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2021-05-06 11:59:40,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-06 11:59:40,762 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:59:40,762 INFO L523 BasicCegarLoop]: trace histogram [11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:59:40,762 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-05-06 11:59:40,762 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:59:40,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:59:40,762 INFO L82 PathProgramCache]: Analyzing trace with hash -1841155664, now seen corresponding path program 9 times [2021-05-06 11:59:40,762 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:59:40,762 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1647911729] [2021-05-06 11:59:40,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:59:40,791 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 11:59:40,792 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:40,833 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 11:59:40,902 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 11:59:40,976 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 11:59:40,983 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 11:59:41,016 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:41,018 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 11:59:45,047 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:59:49,080 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 11:59:53,100 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 11:59:57,125 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:00:01,141 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 12:00:05,160 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification that was a NOOP. DAG size: 22 [2021-05-06 12:00:09,193 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:00:09,388 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 12:00:09,428 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 12:00:09,490 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 12:00:09,665 WARN L205 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:00:09,665 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:09,667 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:09,681 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 12:00:09,803 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:09,805 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:13,842 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 12:00:14,007 WARN L205 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 1 [2021-05-06 12:00:16,328 WARN L205 SmtUtils]: Spent 2.32 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:00:17,599 WARN L205 SmtUtils]: Spent 1.27 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:00:17,918 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2021-05-06 12:00:18,142 WARN L205 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 12:00:18,160 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 12:00:18,203 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 12:00:18,379 WARN L205 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 7 [2021-05-06 12:00:18,543 WARN L205 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2021-05-06 12:00:18,680 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 12:00:19,153 WARN L205 SmtUtils]: Spent 472.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 12:00:19,153 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:19,157 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 12:00:19,208 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:19,209 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:21,290 WARN L205 SmtUtils]: Spent 2.08 s on a formula simplification that was a NOOP. DAG size: 15 [2021-05-06 12:00:25,310 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 12:00:29,344 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 15 DAG size of output: 1 [2021-05-06 12:00:29,397 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 12:00:29,413 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 12:00:29,448 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 12:00:29,544 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:00:29,545 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:00:29,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:29,789 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 14 [2021-05-06 12:00:30,224 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:00:30,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:00:30,227 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:00:30,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:00:30,334 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2021-05-06 12:00:30,748 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 23 [2021-05-06 12:00:31,040 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:00:31,357 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:00:31,677 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:00:32,020 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:00:32,381 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:00:32,787 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:00:33,226 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:00:33,712 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:00:33,888 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:00:33,888 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1647911729] [2021-05-06 12:00:33,888 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1647911729] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:00:33,888 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:00:33,888 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 12:00:33,888 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1211115875] [2021-05-06 12:00:33,888 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 12:00:33,888 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:00:33,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 12:00:33,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2021-05-06 12:00:33,889 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand has 17 states, 16 states have (on average 1.8125) internal successors, (29), 15 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:34,234 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2021-05-06 12:00:34,491 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:00:34,828 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:00:35,263 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:00:35,674 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:00:36,054 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:00:36,484 WARN L205 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:00:36,865 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:00:37,267 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:00:37,640 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:00:38,044 WARN L205 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:00:38,466 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 12:00:38,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:00:38,571 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2021-05-06 12:00:38,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 12:00:38,572 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.8125) internal successors, (29), 15 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-05-06 12:00:38,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:00:38,573 INFO L225 Difference]: With dead ends: 44 [2021-05-06 12:00:38,573 INFO L226 Difference]: Without dead ends: 37 [2021-05-06 12:00:38,573 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 13 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 180 ImplicationChecksByTransitivity, 6963.7ms TimeCoverageRelationStatistics Valid=141, Invalid=789, Unknown=0, NotChecked=0, Total=930 [2021-05-06 12:00:38,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-06 12:00:38,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-05-06 12:00:38,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.125) internal successors, (36), 32 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:38,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2021-05-06 12:00:38,578 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 33 [2021-05-06 12:00:38,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:00:38,578 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2021-05-06 12:00:38,578 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 1.8125) internal successors, (29), 15 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:00:38,578 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2021-05-06 12:00:38,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-06 12:00:38,578 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:00:38,579 INFO L523 BasicCegarLoop]: trace histogram [12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:00:38,579 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-05-06 12:00:38,579 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:00:38,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:00:38,579 INFO L82 PathProgramCache]: Analyzing trace with hash 412365707, now seen corresponding path program 10 times [2021-05-06 12:00:38,579 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:00:38,579 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1903050788] [2021-05-06 12:00:38,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:00:38,632 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 12:00:38,674 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:38,723 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:00:38,758 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 12:00:38,876 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2021-05-06 12:00:38,877 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 12:00:38,885 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 12:00:38,936 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:38,938 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:00:42,985 WARN L205 SmtUtils]: Spent 4.04 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:00:47,003 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 12:00:51,024 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:00:55,062 WARN L205 SmtUtils]: Spent 4.04 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:00:59,088 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 12:01:03,110 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification that was a NOOP. DAG size: 22 [2021-05-06 12:01:07,137 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:01:07,365 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 12:01:07,412 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 12:01:07,482 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 12:01:07,672 WARN L205 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:01:07,673 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:07,674 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:07,676 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 12:01:07,704 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:07,706 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:07,922 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2021-05-06 12:01:08,322 WARN L205 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 1 [2021-05-06 12:01:08,772 WARN L205 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 12:01:08,924 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:01:09,039 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 12:01:09,145 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 12:01:09,428 WARN L205 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2021-05-06 12:01:09,528 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 12:01:09,964 WARN L205 SmtUtils]: Spent 435.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-06 12:01:09,964 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:09,974 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 12:01:10,027 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:10,028 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:01:14,047 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 15 DAG size of output: 1 [2021-05-06 12:01:16,978 WARN L205 SmtUtils]: Spent 2.93 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 12:01:17,014 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 12:01:17,026 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 12:01:17,061 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 12:01:17,146 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:01:17,147 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:01:17,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:17,419 WARN L205 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 14 [2021-05-06 12:01:17,827 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2021-05-06 12:01:17,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:01:17,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:01:17,847 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 12:01:17,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:20,193 WARN L205 SmtUtils]: Spent 2.34 s on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 12:01:25,858 WARN L205 SmtUtils]: Spent 2.26 s on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 12:01:25,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:28,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:34,858 WARN L205 SmtUtils]: Spent 4.16 s on a formula simplification that was a NOOP. DAG size: 64 [2021-05-06 12:01:34,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:37,030 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:41,650 WARN L205 SmtUtils]: Spent 4.49 s on a formula simplification. DAG size of input: 69 DAG size of output: 67 [2021-05-06 12:01:41,652 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:41,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:46,486 WARN L205 SmtUtils]: Spent 4.48 s on a formula simplification. DAG size of input: 70 DAG size of output: 66 [2021-05-06 12:01:46,488 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:46,664 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:56,373 WARN L205 SmtUtils]: Spent 5.38 s on a formula simplification. DAG size of input: 70 DAG size of output: 66 [2021-05-06 12:01:56,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:01:58,550 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:03,496 WARN L205 SmtUtils]: Spent 4.66 s on a formula simplification. DAG size of input: 70 DAG size of output: 66 [2021-05-06 12:02:03,498 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:05,758 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:13,111 WARN L205 SmtUtils]: Spent 4.90 s on a formula simplification. DAG size of input: 70 DAG size of output: 66 [2021-05-06 12:02:13,112 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:13,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:22,893 WARN L205 SmtUtils]: Spent 4.62 s on a formula simplification. DAG size of input: 70 DAG size of output: 66 [2021-05-06 12:02:22,894 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:23,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:28,282 WARN L205 SmtUtils]: Spent 4.56 s on a formula simplification. DAG size of input: 70 DAG size of output: 66 [2021-05-06 12:02:28,283 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:28,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:40,143 WARN L205 SmtUtils]: Spent 4.67 s on a formula simplification. DAG size of input: 70 DAG size of output: 66 [2021-05-06 12:02:40,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:47,161 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:56,692 WARN L205 SmtUtils]: Spent 4.92 s on a formula simplification. DAG size of input: 70 DAG size of output: 66 [2021-05-06 12:02:56,693 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:02:59,202 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:12,749 WARN L205 SmtUtils]: Spent 4.92 s on a formula simplification. DAG size of input: 70 DAG size of output: 66 [2021-05-06 12:03:12,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:17,672 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:03:17,682 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:03:17,682 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1903050788] [2021-05-06 12:03:17,682 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1903050788] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:03:17,682 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:03:17,682 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 12:03:17,683 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [676185453] [2021-05-06 12:03:17,683 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 12:03:17,683 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:03:17,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 12:03:17,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=335, Unknown=16, NotChecked=0, Total=420 [2021-05-06 12:03:17,683 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand has 18 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 16 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:03:18,812 WARN L205 SmtUtils]: Spent 326.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 48 [2021-05-06 12:03:26,037 WARN L205 SmtUtils]: Spent 2.32 s on a formula simplification that was a NOOP. DAG size: 94 [2021-05-06 12:03:36,373 WARN L205 SmtUtils]: Spent 2.69 s on a formula simplification that was a NOOP. DAG size: 96 [2021-05-06 12:03:41,641 WARN L205 SmtUtils]: Spent 2.30 s on a formula simplification that was a NOOP. DAG size: 96 [2021-05-06 12:03:44,504 WARN L205 SmtUtils]: Spent 2.26 s on a formula simplification that was a NOOP. DAG size: 96 [2021-05-06 12:03:50,105 WARN L205 SmtUtils]: Spent 2.72 s on a formula simplification that was a NOOP. DAG size: 96 [2021-05-06 12:03:53,632 WARN L205 SmtUtils]: Spent 2.85 s on a formula simplification that was a NOOP. DAG size: 96 [2021-05-06 12:03:59,401 WARN L205 SmtUtils]: Spent 2.62 s on a formula simplification that was a NOOP. DAG size: 96 [2021-05-06 12:04:06,617 WARN L205 SmtUtils]: Spent 2.38 s on a formula simplification that was a NOOP. DAG size: 96 [2021-05-06 12:04:09,828 WARN L205 SmtUtils]: Spent 2.46 s on a formula simplification that was a NOOP. DAG size: 96 [2021-05-06 12:04:12,666 WARN L205 SmtUtils]: Spent 2.25 s on a formula simplification that was a NOOP. DAG size: 96 [2021-05-06 12:04:20,398 WARN L205 SmtUtils]: Spent 2.60 s on a formula simplification that was a NOOP. DAG size: 96 [2021-05-06 12:04:21,448 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 12:04:21,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:21,797 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2021-05-06 12:04:21,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 12:04:21,797 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 16 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-06 12:04:21,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:21,798 INFO L225 Difference]: With dead ends: 46 [2021-05-06 12:04:21,798 INFO L226 Difference]: Without dead ends: 39 [2021-05-06 12:04:21,798 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 13 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 162177.7ms TimeCoverageRelationStatistics Valid=158, Invalid=942, Unknown=22, NotChecked=0, Total=1122 [2021-05-06 12:04:21,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-06 12:04:21,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-05-06 12:04:21,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 34 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:21,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2021-05-06 12:04:21,808 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 35 [2021-05-06 12:04:21,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:21,809 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2021-05-06 12:04:21,809 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 16 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:21,809 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2021-05-06 12:04:21,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 12:04:21,809 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:21,809 INFO L523 BasicCegarLoop]: trace histogram [13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:21,809 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-05-06 12:04:21,810 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:21,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:21,810 INFO L82 PathProgramCache]: Analyzing trace with hash 1382886054, now seen corresponding path program 11 times [2021-05-06 12:04:21,810 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:21,810 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1943459120] [2021-05-06 12:04:21,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:21,841 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 12:04:21,842 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:21,881 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:04:21,960 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 12:04:22,062 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2021-05-06 12:04:22,062 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:22,069 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 12:04:22,070 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:22,071 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:22,321 WARN L205 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 12:04:22,511 WARN L205 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:04:24,542 WARN L205 SmtUtils]: Spent 2.03 s on a formula simplification that was a NOOP. DAG size: 23 [2021-05-06 12:04:24,659 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:04:24,890 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 12:04:24,896 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 12:04:24,908 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 12:04:25,024 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 12:04:25,224 WARN L205 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:04:25,225 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:25,226 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:25,228 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 12:04:25,228 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:25,230 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:27,307 WARN L205 SmtUtils]: Spent 2.08 s on a formula simplification that was a NOOP. DAG size: 23 [2021-05-06 12:04:30,043 WARN L205 SmtUtils]: Spent 2.74 s on a formula simplification. DAG size of input: 23 DAG size of output: 1 [2021-05-06 12:04:34,073 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:04:38,098 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:04:38,364 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 12:04:38,967 WARN L205 SmtUtils]: Spent 601.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2021-05-06 12:04:39,003 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 12:04:39,234 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 12:04:39,853 WARN L205 SmtUtils]: Spent 619.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 12:04:39,854 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:39,857 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 12:04:39,908 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:39,910 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:40,025 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 12:04:40,038 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 12:04:40,075 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 12:04:40,170 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:40,171 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:40,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:40,490 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2021-05-06 12:04:40,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:40,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:40,764 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:40,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:40,899 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2021-05-06 12:04:41,314 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 23 [2021-05-06 12:04:41,591 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:04:41,887 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:04:42,222 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:04:42,574 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:04:42,966 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:04:43,395 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:04:43,853 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:04:44,365 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:04:44,903 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:04:45,457 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:04:45,678 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:04:45,678 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1943459120] [2021-05-06 12:04:45,678 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1943459120] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:04:45,678 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:04:45,678 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 12:04:45,678 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488998993] [2021-05-06 12:04:45,679 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 12:04:45,679 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:04:45,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 12:04:45,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2021-05-06 12:04:45,679 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 17 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:46,055 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2021-05-06 12:04:46,372 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:04:46,844 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:04:47,293 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:04:47,734 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:04:48,165 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:04:48,588 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:04:49,024 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:04:49,467 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:04:49,914 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:04:50,336 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:04:50,777 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:04:51,176 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:04:51,553 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 12:04:51,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:04:51,838 INFO L93 Difference]: Finished difference Result 48 states and 53 transitions. [2021-05-06 12:04:51,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 12:04:51,838 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 17 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-05-06 12:04:51,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:04:51,839 INFO L225 Difference]: With dead ends: 48 [2021-05-06 12:04:51,839 INFO L226 Difference]: Without dead ends: 41 [2021-05-06 12:04:51,839 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 4 SyntacticMatches, 15 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 225 ImplicationChecksByTransitivity, 8732.4ms TimeCoverageRelationStatistics Valid=163, Invalid=1027, Unknown=0, NotChecked=0, Total=1190 [2021-05-06 12:04:51,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-06 12:04:51,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-05-06 12:04:51,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.1111111111111112) internal successors, (40), 36 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:51,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2021-05-06 12:04:51,846 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 37 [2021-05-06 12:04:51,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:04:51,846 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2021-05-06 12:04:51,846 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 17 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:04:51,846 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2021-05-06 12:04:51,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-06 12:04:51,846 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:04:51,846 INFO L523 BasicCegarLoop]: trace histogram [14, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:04:51,846 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2021-05-06 12:04:51,846 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:04:51,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:04:51,847 INFO L82 PathProgramCache]: Analyzing trace with hash 2045036289, now seen corresponding path program 12 times [2021-05-06 12:04:51,847 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:04:51,847 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1672716158] [2021-05-06 12:04:51,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:04:51,887 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 12:04:51,922 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:51,961 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:04:51,995 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 12:04:52,077 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:52,084 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 12:04:52,085 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:52,086 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:52,248 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 12:04:52,262 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 12:04:52,373 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 12:04:52,763 WARN L205 SmtUtils]: Spent 389.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:04:52,764 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:52,765 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:52,767 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 12:04:52,767 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:52,768 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:53,333 WARN L205 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:04:53,917 WARN L205 SmtUtils]: Spent 506.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2021-05-06 12:04:54,069 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 12:04:54,070 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 12:04:54,129 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 12:04:54,454 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2021-05-06 12:04:54,491 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 12:04:54,977 WARN L205 SmtUtils]: Spent 485.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 12:04:54,978 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:54,989 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 12:04:55,041 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:55,043 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:04:55,099 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 12:04:55,113 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 12:04:55,151 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 12:04:55,235 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:04:55,236 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:04:55,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:55,461 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 19 [2021-05-06 12:04:55,696 WARN L205 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 15 [2021-05-06 12:04:55,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:04:55,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:04:55,979 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:04:55,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:04:56,089 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 13 [2021-05-06 12:04:56,302 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 16 [2021-05-06 12:04:56,550 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2021-05-06 12:04:56,797 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:04:57,106 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:04:57,435 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:04:57,781 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:04:58,183 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:04:58,982 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:04:59,417 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:04:59,898 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:05:00,387 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:05:00,894 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:05:01,108 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:01,108 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1672716158] [2021-05-06 12:05:01,109 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1672716158] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:01,109 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:01,109 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 12:05:01,109 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652280035] [2021-05-06 12:05:01,109 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 12:05:01,109 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:01,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 12:05:01,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=390, Unknown=0, NotChecked=0, Total=462 [2021-05-06 12:05:01,110 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 18 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 12:05:01,641 WARN L205 SmtUtils]: Spent 341.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 44 [2021-05-06 12:05:01,911 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:02,307 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:02,755 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:03,201 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:03,655 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:04,075 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:04,548 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:04,988 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:05,430 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:05,914 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:06,391 WARN L205 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:06,834 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:07,303 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:07,813 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 12:05:07,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:07,956 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2021-05-06 12:05:07,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 12:05:07,956 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 18 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 12:05:07,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:07,956 INFO L225 Difference]: With dead ends: 50 [2021-05-06 12:05:07,957 INFO L226 Difference]: Without dead ends: 43 [2021-05-06 12:05:07,957 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 4 SyntacticMatches, 16 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 249 ImplicationChecksByTransitivity, 9603.0ms TimeCoverageRelationStatistics Valid=174, Invalid=1158, Unknown=0, NotChecked=0, Total=1332 [2021-05-06 12:05:07,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-06 12:05:07,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-05-06 12:05:07,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.105263157894737) internal successors, (42), 38 states have internal predecessors, (42), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:07,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2021-05-06 12:05:07,963 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 39 [2021-05-06 12:05:07,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:07,963 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2021-05-06 12:05:07,964 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 18 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 12:05:07,964 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2021-05-06 12:05:07,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-06 12:05:07,964 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:07,964 INFO L523 BasicCegarLoop]: trace histogram [15, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:07,964 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2021-05-06 12:05:07,964 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:07,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:07,965 INFO L82 PathProgramCache]: Analyzing trace with hash -1578714980, now seen corresponding path program 13 times [2021-05-06 12:05:07,966 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:07,966 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [555082170] [2021-05-06 12:05:07,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:08,001 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 12:05:08,043 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:08,086 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:05:08,137 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 12:05:08,234 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:08,241 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 12:05:08,242 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:08,243 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:08,358 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 12:05:08,374 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 12:05:08,533 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 12:05:08,752 WARN L205 SmtUtils]: Spent 218.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:05:08,753 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:08,754 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:08,756 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 12:05:08,797 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:08,798 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:10,903 WARN L205 SmtUtils]: Spent 2.10 s on a formula simplification. DAG size of input: 23 DAG size of output: 1 [2021-05-06 12:05:12,966 WARN L205 SmtUtils]: Spent 2.06 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 12:05:15,036 WARN L205 SmtUtils]: Spent 2.07 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:05:17,080 WARN L205 SmtUtils]: Spent 2.04 s on a formula simplification that was a NOOP. DAG size: 23 [2021-05-06 12:05:17,561 WARN L205 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 12:05:17,693 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 12:05:17,754 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 12:05:17,968 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 12:05:18,412 WARN L205 SmtUtils]: Spent 442.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 12:05:18,412 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:18,429 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 12:05:18,430 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:18,431 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:18,573 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 12:05:18,587 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 12:05:18,674 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 12:05:18,773 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:18,774 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:18,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:19,065 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 11 [2021-05-06 12:05:19,333 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:19,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:19,365 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:19,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:19,487 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2021-05-06 12:05:20,040 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:05:20,327 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:05:20,687 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:05:21,012 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:05:21,356 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:05:22,163 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:05:22,612 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:05:23,085 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:05:23,572 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:05:24,091 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:05:24,608 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:05:24,847 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:24,847 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [555082170] [2021-05-06 12:05:24,847 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [555082170] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:24,847 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:24,848 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 12:05:24,848 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304425636] [2021-05-06 12:05:24,848 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 12:05:24,848 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:24,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 12:05:24,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=430, Unknown=0, NotChecked=0, Total=506 [2021-05-06 12:05:24,848 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand has 21 states, 20 states have (on average 1.85) internal successors, (37), 19 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:25,169 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2021-05-06 12:05:25,431 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2021-05-06 12:05:25,877 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:26,348 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:26,817 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:27,304 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:27,754 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:28,193 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:28,653 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:29,115 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:29,555 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:29,990 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:30,471 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:30,935 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:31,384 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:05:31,782 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 12:05:31,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:31,946 INFO L93 Difference]: Finished difference Result 52 states and 57 transitions. [2021-05-06 12:05:31,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 12:05:31,946 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.85) internal successors, (37), 19 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-06 12:05:31,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:31,947 INFO L225 Difference]: With dead ends: 52 [2021-05-06 12:05:31,947 INFO L226 Difference]: Without dead ends: 45 [2021-05-06 12:05:31,947 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 4 SyntacticMatches, 17 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 9782.3ms TimeCoverageRelationStatistics Valid=185, Invalid=1297, Unknown=0, NotChecked=0, Total=1482 [2021-05-06 12:05:31,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-06 12:05:31,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-05-06 12:05:31,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.1) internal successors, (44), 40 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:31,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2021-05-06 12:05:31,964 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 41 [2021-05-06 12:05:31,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:31,964 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2021-05-06 12:05:31,964 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 1.85) internal successors, (37), 19 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:31,964 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2021-05-06 12:05:31,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-06 12:05:31,965 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:31,965 INFO L523 BasicCegarLoop]: trace histogram [16, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:31,965 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2021-05-06 12:05:31,965 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:31,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:31,965 INFO L82 PathProgramCache]: Analyzing trace with hash -785207433, now seen corresponding path program 14 times [2021-05-06 12:05:31,965 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:31,965 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [18657583] [2021-05-06 12:05:31,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:31,994 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 12:05:32,029 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:32,065 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:05:32,096 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 12:05:32,177 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:32,184 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 12:05:32,184 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:32,186 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:33,566 WARN L205 SmtUtils]: Spent 1.38 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:05:33,697 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 12:05:33,712 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 12:05:33,857 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 12:05:34,021 WARN L205 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:05:34,022 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:34,023 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:34,027 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 12:05:34,027 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:34,061 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:34,175 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 12:05:34,315 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 12:05:36,653 WARN L205 SmtUtils]: Spent 2.27 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:05:36,841 WARN L205 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:05:37,042 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 12:05:37,161 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 12:05:37,469 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 12:05:37,973 WARN L205 SmtUtils]: Spent 503.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 12:05:37,973 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:37,990 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 12:05:38,044 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:38,045 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:38,181 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 1 [2021-05-06 12:05:38,225 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 12:05:38,244 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 12:05:38,291 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 12:05:38,380 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 12:05:38,381 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:38,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:38,557 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 11 [2021-05-06 12:05:38,709 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 11 [2021-05-06 12:05:38,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:05:38,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:05:38,987 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:05:38,990 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:05:39,116 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 13 [2021-05-06 12:05:39,707 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:05:40,053 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:05:40,404 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:05:40,778 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:05:41,192 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:05:41,610 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:05:42,069 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:05:42,560 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:05:43,080 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:05:43,634 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:05:44,234 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:05:44,897 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:05:45,598 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:05:45,894 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:05:45,894 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [18657583] [2021-05-06 12:05:45,894 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [18657583] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:05:45,894 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:05:45,894 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 12:05:45,894 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27169808] [2021-05-06 12:05:45,894 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 12:05:45,894 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:05:45,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 12:05:45,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2021-05-06 12:05:45,895 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand has 22 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 20 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:46,216 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-06 12:05:46,481 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-06 12:05:46,914 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:05:47,434 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:05:47,941 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:05:48,458 WARN L205 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:05:48,971 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:05:49,545 WARN L205 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:05:50,112 WARN L205 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:05:50,646 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:05:51,167 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:05:51,683 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:05:52,190 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:05:52,672 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:05:53,165 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:05:53,619 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:05:54,088 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 12:05:54,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:05:54,196 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2021-05-06 12:05:54,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 12:05:54,196 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 20 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2021-05-06 12:05:54,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:05:54,197 INFO L225 Difference]: With dead ends: 54 [2021-05-06 12:05:54,197 INFO L226 Difference]: Without dead ends: 47 [2021-05-06 12:05:54,197 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 4 SyntacticMatches, 18 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 11899.1ms TimeCoverageRelationStatistics Valid=196, Invalid=1444, Unknown=0, NotChecked=0, Total=1640 [2021-05-06 12:05:54,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-06 12:05:54,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-05-06 12:05:54,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0952380952380953) internal successors, (46), 42 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:54,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions. [2021-05-06 12:05:54,206 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 43 [2021-05-06 12:05:54,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:05:54,206 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 50 transitions. [2021-05-06 12:05:54,206 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 20 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:05:54,206 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions. [2021-05-06 12:05:54,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-06 12:05:54,207 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:05:54,207 INFO L523 BasicCegarLoop]: trace histogram [17, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:05:54,207 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2021-05-06 12:05:54,207 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:05:54,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:05:54,207 INFO L82 PathProgramCache]: Analyzing trace with hash 1566333842, now seen corresponding path program 15 times [2021-05-06 12:05:54,207 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:05:54,208 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [114235568] [2021-05-06 12:05:54,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:05:54,248 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 12:05:54,298 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:54,343 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:05:54,381 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 12:05:54,476 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:54,483 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 12:05:54,522 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:54,524 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:56,581 WARN L205 SmtUtils]: Spent 2.05 s on a formula simplification that was a NOOP. DAG size: 23 [2021-05-06 12:05:58,910 WARN L205 SmtUtils]: Spent 2.33 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:05:58,997 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 12:05:59,010 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 12:05:59,077 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 12:05:59,268 WARN L205 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:05:59,269 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:05:59,270 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:05:59,272 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 12:05:59,272 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:59,274 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:05:59,486 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:05:59,907 WARN L205 SmtUtils]: Spent 291.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:06:00,131 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 12:06:00,236 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 12:06:00,472 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 12:06:02,266 WARN L205 SmtUtils]: Spent 1.79 s on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 12:06:02,266 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:02,269 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 12:06:02,314 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:02,316 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:02,378 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 12:06:02,399 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 12:06:02,432 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 12:06:02,514 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:02,515 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:02,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:02,825 WARN L205 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 16 [2021-05-06 12:06:03,070 WARN L205 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 20 [2021-05-06 12:06:03,369 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:03,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:03,386 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:03,395 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:03,499 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 13 [2021-05-06 12:06:03,914 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 23 [2021-05-06 12:06:04,188 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:06:04,491 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:06:04,833 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:06:05,205 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:06:05,612 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:06:06,034 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:06:06,548 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:06:07,058 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:06:07,642 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:06:08,216 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:06:08,797 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:06:09,416 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:06:10,054 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:06:10,726 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:06:11,002 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:11,002 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [114235568] [2021-05-06 12:06:11,002 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [114235568] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:11,002 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:11,002 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 12:06:11,002 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245753627] [2021-05-06 12:06:11,002 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 12:06:11,002 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:11,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 12:06:11,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=516, Unknown=0, NotChecked=0, Total=600 [2021-05-06 12:06:11,003 INFO L87 Difference]: Start difference. First operand 47 states and 50 transitions. Second operand has 23 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 21 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:11,591 WARN L205 SmtUtils]: Spent 341.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 51 [2021-05-06 12:06:11,936 WARN L205 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-06 12:06:12,453 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:06:12,967 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:06:13,485 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:06:13,985 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:06:14,496 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:06:15,016 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:06:15,550 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:06:16,064 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:06:16,593 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:06:17,100 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:06:17,593 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:06:18,114 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:06:18,621 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:06:19,130 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:06:19,650 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:06:20,148 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2021-05-06 12:06:20,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:20,403 INFO L93 Difference]: Finished difference Result 56 states and 61 transitions. [2021-05-06 12:06:20,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 12:06:20,404 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 21 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2021-05-06 12:06:20,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:20,404 INFO L225 Difference]: With dead ends: 56 [2021-05-06 12:06:20,404 INFO L226 Difference]: Without dead ends: 49 [2021-05-06 12:06:20,405 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 4 SyntacticMatches, 19 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 13440.6ms TimeCoverageRelationStatistics Valid=207, Invalid=1599, Unknown=0, NotChecked=0, Total=1806 [2021-05-06 12:06:20,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-06 12:06:20,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-05-06 12:06:20,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.0909090909090908) internal successors, (48), 44 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:20,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2021-05-06 12:06:20,412 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 45 [2021-05-06 12:06:20,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:20,412 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2021-05-06 12:06:20,412 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 21 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:20,413 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2021-05-06 12:06:20,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-06 12:06:20,416 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:20,416 INFO L523 BasicCegarLoop]: trace histogram [18, 16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:20,416 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2021-05-06 12:06:20,416 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:20,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:20,417 INFO L82 PathProgramCache]: Analyzing trace with hash -2050265875, now seen corresponding path program 16 times [2021-05-06 12:06:20,417 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:20,417 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [714522873] [2021-05-06 12:06:20,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:20,448 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 12:06:20,448 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:20,494 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:06:20,558 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 12:06:20,642 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:20,650 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 12:06:20,684 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:20,686 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:22,608 WARN L205 SmtUtils]: Spent 1.92 s on a formula simplification. DAG size of input: 23 DAG size of output: 1 [2021-05-06 12:06:22,687 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 12:06:22,699 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 12:06:22,765 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 12:06:23,116 WARN L205 SmtUtils]: Spent 351.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:06:23,116 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:23,118 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:23,119 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 12:06:23,160 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:23,161 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:23,400 WARN L205 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 1 [2021-05-06 12:06:23,641 WARN L205 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:06:24,039 WARN L205 SmtUtils]: Spent 351.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:06:24,391 WARN L205 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 1 [2021-05-06 12:06:24,391 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 12:06:24,620 WARN L205 SmtUtils]: Spent 189.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2021-05-06 12:06:24,620 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 12:06:24,958 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2021-05-06 12:06:24,960 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 12:06:25,501 WARN L205 SmtUtils]: Spent 540.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 12:06:25,502 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:25,508 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 12:06:25,560 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:25,562 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:25,679 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 12:06:25,721 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 12:06:25,735 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 12:06:25,772 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 12:06:25,860 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:25,861 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:25,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:26,204 WARN L205 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 11 [2021-05-06 12:06:26,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:26,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:26,486 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:26,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:26,608 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2021-05-06 12:06:26,992 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2021-05-06 12:06:27,236 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:06:27,537 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:06:27,845 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:06:28,171 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:06:28,556 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:06:28,951 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:06:29,378 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:06:29,819 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:06:30,294 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:06:30,798 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:06:31,301 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:06:31,836 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:06:32,400 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:06:32,982 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:06:33,649 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:06:33,920 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:06:33,920 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [714522873] [2021-05-06 12:06:33,920 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [714522873] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:06:33,920 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:06:33,920 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 12:06:33,920 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172719097] [2021-05-06 12:06:33,920 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 12:06:33,920 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:06:33,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 12:06:33,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=562, Unknown=0, NotChecked=0, Total=650 [2021-05-06 12:06:33,921 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand has 24 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 22 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:34,297 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:06:34,612 WARN L205 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:06:35,053 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:06:35,583 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:06:36,100 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:06:36,646 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:06:37,197 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:06:37,732 WARN L205 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:06:38,237 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:06:38,743 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:06:39,252 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:06:39,776 WARN L205 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:06:40,276 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:06:40,785 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:06:41,281 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:06:41,748 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:06:42,232 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:06:42,695 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:06:43,157 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 12:06:43,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:06:43,247 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2021-05-06 12:06:43,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 12:06:43,247 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 22 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-05-06 12:06:43,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:06:43,248 INFO L225 Difference]: With dead ends: 58 [2021-05-06 12:06:43,248 INFO L226 Difference]: Without dead ends: 51 [2021-05-06 12:06:43,248 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 4 SyntacticMatches, 20 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 13004.4ms TimeCoverageRelationStatistics Valid=218, Invalid=1762, Unknown=0, NotChecked=0, Total=1980 [2021-05-06 12:06:43,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-06 12:06:43,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-05-06 12:06:43,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.0869565217391304) internal successors, (50), 46 states have internal predecessors, (50), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:43,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2021-05-06 12:06:43,255 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 47 [2021-05-06 12:06:43,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:06:43,255 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2021-05-06 12:06:43,255 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 22 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:06:43,255 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2021-05-06 12:06:43,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-06 12:06:43,256 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:06:43,256 INFO L523 BasicCegarLoop]: trace histogram [19, 17, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:06:43,256 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2021-05-06 12:06:43,256 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:06:43,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:06:43,256 INFO L82 PathProgramCache]: Analyzing trace with hash 1320915848, now seen corresponding path program 17 times [2021-05-06 12:06:43,256 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:06:43,256 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1291103760] [2021-05-06 12:06:43,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:06:43,283 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 12:06:43,284 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:43,320 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:06:43,384 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 12:06:43,477 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:43,483 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 12:06:43,519 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:43,522 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:43,856 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 12:06:43,862 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 12:06:43,877 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 12:06:43,954 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 12:06:44,129 WARN L205 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:06:44,129 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:44,130 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:44,132 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 12:06:44,173 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:44,175 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:46,217 WARN L205 SmtUtils]: Spent 2.04 s on a formula simplification. DAG size of input: 23 DAG size of output: 1 [2021-05-06 12:06:50,251 WARN L205 SmtUtils]: Spent 4.03 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 12:06:50,666 WARN L205 SmtUtils]: Spent 413.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:06:52,953 WARN L205 SmtUtils]: Spent 2.29 s on a formula simplification that was a NOOP. DAG size: 23 [2021-05-06 12:06:55,562 WARN L205 SmtUtils]: Spent 2.61 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:06:55,799 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:06:55,800 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 12:06:55,880 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 12:06:56,038 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2021-05-06 12:06:56,142 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 7 [2021-05-06 12:06:56,217 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 12:06:57,779 WARN L205 SmtUtils]: Spent 1.56 s on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 12:06:57,780 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:57,783 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 12:06:57,783 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:57,784 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:06:57,867 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 12:06:57,879 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 12:06:57,965 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 12:06:58,054 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:06:58,055 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:06:58,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:58,269 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 9 [2021-05-06 12:06:58,456 WARN L205 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2021-05-06 12:06:58,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:06:58,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:06:58,719 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:06:58,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:06:58,826 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2021-05-06 12:06:59,223 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2021-05-06 12:06:59,767 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:07:00,090 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:07:00,437 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:07:00,803 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:07:01,213 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:07:01,639 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:07:02,108 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:07:02,576 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:07:03,073 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:07:03,620 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:07:04,751 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:07:05,967 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:07:06,907 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:06,907 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1291103760] [2021-05-06 12:07:06,907 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1291103760] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:06,907 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:06,907 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-06 12:07:06,908 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058050744] [2021-05-06 12:07:06,908 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-06 12:07:06,908 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:06,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-06 12:07:06,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=610, Unknown=0, NotChecked=0, Total=702 [2021-05-06 12:07:06,908 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand has 25 states, 24 states have (on average 1.875) internal successors, (45), 23 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 12:07:07,320 WARN L205 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:07:07,611 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:07:08,029 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:07:08,535 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:07:09,057 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:07:09,551 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:07:10,051 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:07:10,536 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:07:11,029 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:07:11,513 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:07:11,985 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:07:12,463 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:07:12,931 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:07:13,390 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:07:13,848 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:07:14,317 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:07:14,801 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:07:15,280 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:07:15,752 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:07:16,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:16,320 INFO L93 Difference]: Finished difference Result 60 states and 65 transitions. [2021-05-06 12:07:16,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 12:07:16,320 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.875) internal successors, (45), 23 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 12:07:16,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:16,321 INFO L225 Difference]: With dead ends: 60 [2021-05-06 12:07:16,321 INFO L226 Difference]: Without dead ends: 53 [2021-05-06 12:07:16,321 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 4 SyntacticMatches, 21 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 384 ImplicationChecksByTransitivity, 13817.9ms TimeCoverageRelationStatistics Valid=229, Invalid=1933, Unknown=0, NotChecked=0, Total=2162 [2021-05-06 12:07:16,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-06 12:07:16,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-05-06 12:07:16,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0833333333333333) internal successors, (52), 48 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:16,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2021-05-06 12:07:16,329 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 49 [2021-05-06 12:07:16,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:16,329 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2021-05-06 12:07:16,329 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 24 states have (on average 1.875) internal successors, (45), 23 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 12:07:16,329 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2021-05-06 12:07:16,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-06 12:07:16,329 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:16,330 INFO L523 BasicCegarLoop]: trace histogram [20, 18, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:16,330 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69 [2021-05-06 12:07:16,330 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:16,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:16,330 INFO L82 PathProgramCache]: Analyzing trace with hash -1673756829, now seen corresponding path program 18 times [2021-05-06 12:07:16,330 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:16,330 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [582137370] [2021-05-06 12:07:16,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:16,355 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 12:07:16,387 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:16,427 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:07:16,460 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 12:07:16,556 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:16,563 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 12:07:16,597 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:16,601 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:16,763 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 12:07:16,777 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 12:07:16,841 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 12:07:17,028 WARN L205 SmtUtils]: Spent 187.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:07:17,029 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:17,030 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:17,031 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 12:07:17,032 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:17,033 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:19,085 WARN L205 SmtUtils]: Spent 2.05 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:07:21,135 WARN L205 SmtUtils]: Spent 2.02 s on a formula simplification. DAG size of input: 23 DAG size of output: 1 [2021-05-06 12:07:23,163 WARN L205 SmtUtils]: Spent 2.03 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 12:07:23,435 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 12:07:23,493 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 12:07:23,681 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2021-05-06 12:07:23,851 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 12:07:24,521 WARN L205 SmtUtils]: Spent 670.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 12:07:24,522 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:24,525 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 12:07:24,570 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:24,575 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:24,738 WARN L205 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 1 [2021-05-06 12:07:24,802 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 12:07:24,814 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 12:07:24,848 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 12:07:24,941 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:24,942 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:24,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:25,335 WARN L205 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2021-05-06 12:07:25,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:25,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:25,624 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:25,625 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:25,738 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2021-05-06 12:07:26,154 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 23 [2021-05-06 12:07:26,489 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:26,785 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:27,140 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:27,519 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:27,928 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:28,377 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:28,848 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:29,508 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:30,060 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:30,607 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:31,186 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:31,790 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:32,442 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:33,075 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:33,765 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:34,470 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:35,235 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:35,584 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:07:35,584 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [582137370] [2021-05-06 12:07:35,584 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [582137370] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:07:35,584 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:07:35,584 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2021-05-06 12:07:35,584 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526135898] [2021-05-06 12:07:35,585 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-06 12:07:35,585 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:07:35,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-06 12:07:35,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=660, Unknown=0, NotChecked=0, Total=756 [2021-05-06 12:07:35,585 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand has 26 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:35,987 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2021-05-06 12:07:36,301 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:07:36,813 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:07:37,419 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:07:38,016 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:07:38,628 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:07:39,208 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:07:39,790 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:07:40,381 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:07:40,961 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:07:41,504 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:07:42,051 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:07:42,606 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:07:43,183 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:07:43,736 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:07:44,258 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:07:44,786 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:07:45,333 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:07:45,913 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:07:46,464 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:07:46,997 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2021-05-06 12:07:47,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:07:47,124 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2021-05-06 12:07:47,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 12:07:47,125 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-06 12:07:47,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:07:47,127 INFO L225 Difference]: With dead ends: 62 [2021-05-06 12:07:47,127 INFO L226 Difference]: Without dead ends: 55 [2021-05-06 12:07:47,128 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 4 SyntacticMatches, 22 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 414 ImplicationChecksByTransitivity, 16487.9ms TimeCoverageRelationStatistics Valid=240, Invalid=2112, Unknown=0, NotChecked=0, Total=2352 [2021-05-06 12:07:47,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-06 12:07:47,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-06 12:07:47,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.08) internal successors, (54), 50 states have internal predecessors, (54), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:47,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2021-05-06 12:07:47,134 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 51 [2021-05-06 12:07:47,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:07:47,134 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2021-05-06 12:07:47,134 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:07:47,134 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2021-05-06 12:07:47,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-06 12:07:47,135 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:07:47,135 INFO L523 BasicCegarLoop]: trace histogram [21, 19, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:07:47,135 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73 [2021-05-06 12:07:47,135 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:07:47,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:07:47,135 INFO L82 PathProgramCache]: Analyzing trace with hash -1926111106, now seen corresponding path program 19 times [2021-05-06 12:07:47,135 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:07:47,135 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [914670145] [2021-05-06 12:07:47,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:07:47,167 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 12:07:47,201 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:47,240 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:07:47,275 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 12:07:47,366 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:47,373 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 12:07:47,410 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:47,411 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:47,721 WARN L205 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 12:07:47,725 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 12:07:47,738 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 12:07:47,804 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 12:07:48,012 WARN L205 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:07:48,012 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:48,013 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:48,015 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 12:07:48,016 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:48,017 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:48,183 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:07:48,464 WARN L205 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:07:49,013 WARN L205 SmtUtils]: Spent 499.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2021-05-06 12:07:49,360 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 1 [2021-05-06 12:07:49,361 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 12:07:49,437 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 12:07:49,556 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 7 [2021-05-06 12:07:49,780 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2021-05-06 12:07:49,908 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 12:07:50,962 WARN L205 SmtUtils]: Spent 1.05 s on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 12:07:50,962 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:07:50,965 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 12:07:50,970 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:50,971 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:07:51,039 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 12:07:51,052 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 12:07:51,131 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 12:07:51,211 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 12:07:51,212 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:07:51,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:51,397 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 14 [2021-05-06 12:07:51,588 WARN L205 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 17 [2021-05-06 12:07:51,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:07:51,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:07:51,888 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:07:51,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:07:52,082 WARN L205 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 13 [2021-05-06 12:07:52,492 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 23 [2021-05-06 12:07:52,759 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:53,069 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:53,385 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:53,740 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:54,117 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:54,514 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:54,969 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:55,443 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:55,955 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:56,483 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:57,057 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:57,668 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:58,281 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:58,929 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:07:59,613 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:08:00,321 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:08:01,101 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:08:01,863 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-06 12:08:02,203 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:02,203 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [914670145] [2021-05-06 12:08:02,203 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [914670145] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:02,203 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:02,203 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2021-05-06 12:08:02,203 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308619944] [2021-05-06 12:08:02,204 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-06 12:08:02,204 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:02,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-06 12:08:02,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=712, Unknown=0, NotChecked=0, Total=812 [2021-05-06 12:08:02,204 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand has 27 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 25 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:08:02,812 WARN L205 SmtUtils]: Spent 281.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 49 [2021-05-06 12:08:03,179 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:08:03,856 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:08:04,478 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:08:05,086 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:08:05,692 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:08:06,260 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:08:06,864 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:08:07,501 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:08:08,129 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:08:08,719 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:08:09,326 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:08:09,925 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:08:10,526 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:08:11,137 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:08:11,688 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:08:12,235 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:08:12,804 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:08:13,346 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:08:13,901 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:08:14,448 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-06 12:08:15,061 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2021-05-06 12:08:15,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:15,520 INFO L93 Difference]: Finished difference Result 64 states and 69 transitions. [2021-05-06 12:08:15,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 12:08:15,521 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 25 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-05-06 12:08:15,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:15,521 INFO L225 Difference]: With dead ends: 64 [2021-05-06 12:08:15,521 INFO L226 Difference]: Without dead ends: 57 [2021-05-06 12:08:15,522 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 4 SyntacticMatches, 23 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 17258.1ms TimeCoverageRelationStatistics Valid=251, Invalid=2299, Unknown=0, NotChecked=0, Total=2550 [2021-05-06 12:08:15,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-06 12:08:15,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-05-06 12:08:15,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.0769230769230769) internal successors, (56), 52 states have internal predecessors, (56), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:08:15,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2021-05-06 12:08:15,528 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 53 [2021-05-06 12:08:15,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:15,528 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2021-05-06 12:08:15,529 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 25 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:08:15,529 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2021-05-06 12:08:15,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 12:08:15,529 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:15,529 INFO L523 BasicCegarLoop]: trace histogram [22, 20, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:15,529 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77 [2021-05-06 12:08:15,529 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:15,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:15,529 INFO L82 PathProgramCache]: Analyzing trace with hash 374564569, now seen corresponding path program 20 times [2021-05-06 12:08:15,530 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:15,530 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1503086319] [2021-05-06 12:08:15,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:15,556 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 12:08:15,557 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:15,593 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:08:15,661 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 12:08:15,743 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:15,750 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 12:08:15,784 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:15,785 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:17,915 WARN L205 SmtUtils]: Spent 2.13 s on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 12:08:18,018 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 12:08:18,032 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 12:08:18,102 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 12:08:18,257 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-06 12:08:18,257 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:18,258 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:18,260 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 12:08:18,261 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:18,262 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:18,786 WARN L205 SmtUtils]: Spent 498.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:08:19,232 WARN L205 SmtUtils]: Spent 444.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 12:08:19,568 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 12:08:19,677 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 12:08:19,989 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 12:08:20,405 WARN L205 SmtUtils]: Spent 415.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-06 12:08:20,405 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:20,410 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 12:08:20,455 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:20,457 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:20,528 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 12:08:20,539 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 12:08:20,576 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 12:08:20,656 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:20,657 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:08:20,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:20,853 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 18 [2021-05-06 12:08:21,036 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2021-05-06 12:08:21,208 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 15 [2021-05-06 12:08:21,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:08:21,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:08:21,443 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:08:21,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:08:27,805 WARN L205 SmtUtils]: Spent 6.36 s on a formula simplification. DAG size of input: 62 DAG size of output: 58 [2021-05-06 12:08:28,029 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 15 [2021-05-06 12:08:28,264 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 16 [2021-05-06 12:08:28,524 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:08:31,576 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:08:33,114 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:08:35,557 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:08:36,990 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2021-05-06 12:08:38,054 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:08:38,054 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1503086319] [2021-05-06 12:08:38,054 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1503086319] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:08:38,054 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:08:38,054 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2021-05-06 12:08:38,054 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270280783] [2021-05-06 12:08:38,054 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-06 12:08:38,055 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:08:38,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-06 12:08:38,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=767, Unknown=0, NotChecked=0, Total=870 [2021-05-06 12:08:38,055 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand has 28 states, 27 states have (on average 1.8888888888888888) internal successors, (51), 26 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:08:38,434 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-06 12:08:38,815 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-06 12:08:39,465 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:08:40,038 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:08:40,636 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:08:41,202 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:08:41,774 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:08:42,328 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:08:42,890 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:08:43,457 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:08:43,997 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:08:44,561 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:08:45,124 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:08:45,676 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:08:46,217 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:08:46,755 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:08:47,308 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:08:47,870 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:08:48,453 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:08:49,002 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:08:49,559 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:08:50,066 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-06 12:08:50,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:08:50,763 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2021-05-06 12:08:50,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-06 12:08:50,763 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 1.8888888888888888) internal successors, (51), 26 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2021-05-06 12:08:50,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:08:50,764 INFO L225 Difference]: With dead ends: 66 [2021-05-06 12:08:50,764 INFO L226 Difference]: Without dead ends: 59 [2021-05-06 12:08:50,765 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 5 SyntacticMatches, 24 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 429 ImplicationChecksByTransitivity, 16903.0ms TimeCoverageRelationStatistics Valid=235, Invalid=2417, Unknown=0, NotChecked=0, Total=2652 [2021-05-06 12:08:50,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-06 12:08:50,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-05-06 12:08:50,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.0740740740740742) internal successors, (58), 54 states have internal predecessors, (58), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:08:50,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2021-05-06 12:08:50,771 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 55 [2021-05-06 12:08:50,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:08:50,771 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2021-05-06 12:08:50,771 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 27 states have (on average 1.8888888888888888) internal successors, (51), 26 states have internal predecessors, (51), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 12:08:50,771 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2021-05-06 12:08:50,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-06 12:08:50,772 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:08:50,772 INFO L523 BasicCegarLoop]: trace histogram [23, 21, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:08:50,772 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81 [2021-05-06 12:08:50,772 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:08:50,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:08:50,772 INFO L82 PathProgramCache]: Analyzing trace with hash -584269196, now seen corresponding path program 21 times [2021-05-06 12:08:50,772 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:08:50,772 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [365729238] [2021-05-06 12:08:50,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:08:50,797 WARN L240 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size [2021-05-06 12:08:50,829 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:50,859 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 17 [2021-05-06 12:08:50,905 WARN L245 tifierPushTermWalker]: treesize reduction 3, result has 94.1 percent of original size 48 [2021-05-06 12:08:51,010 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2021-05-06 12:08:51,010 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:08:51,016 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size [2021-05-06 12:08:51,017 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:51,018 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:08:55,045 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 12:08:57,124 WARN L205 SmtUtils]: Spent 2.08 s on a formula simplification. DAG size of input: 22 DAG size of output: 1 [2021-05-06 12:09:01,142 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:09:05,161 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:09:08,828 WARN L205 SmtUtils]: Spent 3.67 s on a formula simplification. DAG size of input: 13 DAG size of output: 1 [2021-05-06 12:09:08,923 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 39 [2021-05-06 12:09:08,988 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 29 [2021-05-06 12:09:09,120 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.6 percent of original size 70 [2021-05-06 12:09:09,296 WARN L205 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2021-05-06 12:09:09,296 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:09,297 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:09,299 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size [2021-05-06 12:09:09,300 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:09,301 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:09,593 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-05-06 12:09:09,681 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 30 [2021-05-06 12:09:09,916 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.9 percent of original size 75 [2021-05-06 12:09:10,643 WARN L205 SmtUtils]: Spent 726.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 69 [2021-05-06 12:09:10,643 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:10,646 WARN L240 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size [2021-05-06 12:09:10,647 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:10,648 WARN L240 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size [2021-05-06 12:09:12,792 WARN L205 SmtUtils]: Spent 2.14 s on a formula simplification. DAG size of input: 3 DAG size of output: 1 [2021-05-06 12:09:16,813 WARN L205 SmtUtils]: Spent 4.02 s on a formula simplification that was a NOOP. DAG size: 15 [2021-05-06 12:09:18,990 WARN L205 SmtUtils]: Spent 2.18 s on a formula simplification. DAG size of input: 15 DAG size of output: 1 [2021-05-06 12:09:19,024 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 36 [2021-05-06 12:09:19,071 WARN L245 tifierPushTermWalker]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-05-06 12:09:19,219 WARN L245 tifierPushTermWalker]: treesize reduction 4, result has 94.7 percent of original size 72 [2021-05-06 12:09:19,361 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2021-05-06 12:09:19,361 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2021-05-06 12:09:19,362 INFO L212 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-05-06 12:09:19,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:19,611 WARN L205 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 12 [2021-05-06 12:09:19,812 WARN L205 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 11 [2021-05-06 12:09:20,088 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:09:20,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:09:20,090 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 12:09:20,092 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 12:09:20,244 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 16 [2021-05-06 12:09:20,565 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2021-05-06 12:09:20,963 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 23 [2021-05-06 12:09:21,513 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2021-05-06 12:09:22,078 WARN L205 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 30 [2021-05-06 12:09:22,427 WARN L205 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 30 [2021-05-06 12:09:22,733 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 26 [2021-05-06 12:09:23,073 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2021-05-06 12:09:23,397 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 26 [2021-05-06 12:09:24,088 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 26 [2021-05-06 12:09:24,514 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2021-05-06 12:09:25,304 WARN L205 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 30 [2021-05-06 12:09:25,791 WARN L205 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 30 [2021-05-06 12:09:26,356 WARN L205 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 30 [2021-05-06 12:09:27,177 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 26 [2021-05-06 12:09:27,639 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 26 [2021-05-06 12:09:28,612 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 26 [2021-05-06 12:09:30,060 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2021-05-06 12:09:30,866 WARN L205 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 26 [2021-05-06 12:09:31,996 WARN L205 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 22 [2021-05-06 12:09:35,477 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2021-05-06 12:09:36,794 WARN L205 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 30 [2021-05-06 12:09:37,497 WARN L205 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 30 [2021-05-06 12:09:38,310 WARN L205 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 30 [2021-05-06 12:09:39,075 WARN L205 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 26 [2021-05-06 12:09:39,802 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2021-05-06 12:09:40,596 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 26