/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/eureka_01-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 23:01:36,577 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 23:01:36,579 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 23:01:36,612 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 23:01:36,673 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 23:01:36,674 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 23:01:36,674 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 23:01:36,678 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-02 23:01:36,699 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 23:01:36,699 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 23:01:36,702 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 23:01:36,702 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 23:01:36,703 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 23:01:36,703 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 23:01:36,703 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 23:01:36,703 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 23:01:36,704 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 23:01:36,704 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 23:01:36,704 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 23:01:36,704 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 23:01:36,705 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 23:01:36,705 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 23:01:36,705 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 23:01:36,705 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 23:01:36,705 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 23:01:36,705 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 23:01:36,705 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 23:01:36,706 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 23:01:36,706 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-02 23:01:36,706 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 23:01:36,706 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-02 23:01:36,706 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 23:01:37,037 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 23:01:37,061 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 23:01:37,063 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 23:01:37,064 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 23:01:37,065 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 23:01:37,066 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/eureka_01-1.c [2021-05-02 23:01:37,125 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a2fc2af67/773097cfb7444e74b013ee8dce2bfd83/FLAGf6da5a49f [2021-05-02 23:01:37,631 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 23:01:37,631 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/eureka_01-1.c [2021-05-02 23:01:37,639 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a2fc2af67/773097cfb7444e74b013ee8dce2bfd83/FLAGf6da5a49f [2021-05-02 23:01:38,109 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a2fc2af67/773097cfb7444e74b013ee8dce2bfd83 [2021-05-02 23:01:38,114 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 23:01:38,115 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 23:01:38,118 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 23:01:38,119 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 23:01:38,122 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 23:01:38,124 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:01:38" (1/1) ... [2021-05-02 23:01:38,128 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@52c890ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:01:38, skipping insertion in model container [2021-05-02 23:01:38,128 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:01:38" (1/1) ... [2021-05-02 23:01:38,135 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 23:01:38,150 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 23:01:38,270 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/eureka_01-1.c[446,459] [2021-05-02 23:01:38,310 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 23:01:38,341 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 23:01:38,356 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/eureka_01-1.c[446,459] [2021-05-02 23:01:38,398 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 23:01:38,423 INFO L208 MainTranslator]: Completed translation [2021-05-02 23:01:38,423 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:01:38 WrapperNode [2021-05-02 23:01:38,423 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 23:01:38,424 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 23:01:38,424 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 23:01:38,424 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 23:01:38,432 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:01:38" (1/1) ... [2021-05-02 23:01:38,433 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:01:38" (1/1) ... [2021-05-02 23:01:38,446 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:01:38" (1/1) ... [2021-05-02 23:01:38,447 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:01:38" (1/1) ... [2021-05-02 23:01:38,457 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:01:38" (1/1) ... [2021-05-02 23:01:38,471 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:01:38" (1/1) ... [2021-05-02 23:01:38,473 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:01:38" (1/1) ... [2021-05-02 23:01:38,475 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 23:01:38,476 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 23:01:38,476 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 23:01:38,476 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 23:01:38,477 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:01:38" (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 [2021-05-02 23:01:38,535 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 23:01:38,535 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 23:01:38,535 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 23:01:38,535 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 23:01:38,535 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 23:01:38,535 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 23:01:38,536 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 23:01:38,536 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 23:01:38,536 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 23:01:38,536 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 23:01:38,536 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 23:01:38,536 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 23:01:38,536 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 23:01:38,536 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 23:01:38,536 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 23:01:38,537 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 23:01:38,537 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 23:01:38,537 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 23:01:38,537 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 23:01:38,537 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 23:01:38,927 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 23:01:38,928 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2021-05-02 23:01:38,929 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:01:38 BoogieIcfgContainer [2021-05-02 23:01:38,929 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 23:01:38,931 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 23:01:38,931 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 23:01:38,933 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 23:01:38,933 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 11:01:38" (1/3) ... [2021-05-02 23:01:38,934 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@541e2035 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:01:38, skipping insertion in model container [2021-05-02 23:01:38,934 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:01:38" (2/3) ... [2021-05-02 23:01:38,935 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@541e2035 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:01:38, skipping insertion in model container [2021-05-02 23:01:38,935 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:01:38" (3/3) ... [2021-05-02 23:01:38,936 INFO L111 eAbstractionObserver]: Analyzing ICFG eureka_01-1.c [2021-05-02 23:01:38,941 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-02 23:01:38,944 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 23:01:38,959 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 23:01:38,977 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 23:01:38,977 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 23:01:38,977 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-02 23:01:38,978 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 23:01:38,978 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 23:01:38,978 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 23:01:38,978 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 23:01:38,978 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 23:01:38,993 INFO L276 IsEmpty]: Start isEmpty. Operand has 37 states, 29 states have (on average 1.5862068965517242) internal successors, (46), 30 states have internal predecessors, (46), 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) [2021-05-02 23:01:39,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 23:01:39,002 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:39,003 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:39,003 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:39,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:39,009 INFO L82 PathProgramCache]: Analyzing trace with hash -1703238628, now seen corresponding path program 1 times [2021-05-02 23:01:39,016 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:39,016 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1035777645] [2021-05-02 23:01:39,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:39,075 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:39,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:39,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:39,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:39,296 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:39,298 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:39,298 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1035777645] [2021-05-02 23:01:39,300 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1035777645] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:39,300 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:39,300 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 23:01:39,300 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1746667174] [2021-05-02 23:01:39,314 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 23:01:39,314 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:39,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 23:01:39,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 23:01:39,328 INFO L87 Difference]: Start difference. First operand has 37 states, 29 states have (on average 1.5862068965517242) internal successors, (46), 30 states have internal predecessors, (46), 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 5.0) internal successors, (15), 2 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) [2021-05-02 23:01:39,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:39,482 INFO L93 Difference]: Finished difference Result 65 states and 91 transitions. [2021-05-02 23:01:39,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 23:01:39,484 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 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 [2021-05-02 23:01:39,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:39,488 INFO L225 Difference]: With dead ends: 65 [2021-05-02 23:01:39,489 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 23:01:39,491 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 42.5ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 23:01:39,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 23:01:39,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 23:01:39,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 26 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:39,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2021-05-02 23:01:39,520 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 19 [2021-05-02 23:01:39,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:39,520 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2021-05-02 23:01:39,521 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 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) [2021-05-02 23:01:39,521 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2021-05-02 23:01:39,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 23:01:39,521 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:39,522 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:39,522 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 23:01:39,522 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:39,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:39,523 INFO L82 PathProgramCache]: Analyzing trace with hash -779965392, now seen corresponding path program 1 times [2021-05-02 23:01:39,523 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:39,523 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2025804331] [2021-05-02 23:01:39,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:39,530 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:39,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:39,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:39,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:39,692 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:39,692 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:39,692 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2025804331] [2021-05-02 23:01:39,692 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2025804331] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:39,693 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:39,693 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 23:01:39,693 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [277594501] [2021-05-02 23:01:39,694 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 23:01:39,694 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:39,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 23:01:39,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 23:01:39,694 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 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) [2021-05-02 23:01:39,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:39,842 INFO L93 Difference]: Finished difference Result 80 states and 100 transitions. [2021-05-02 23:01:39,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 23:01:39,842 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 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 [2021-05-02 23:01:39,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:39,845 INFO L225 Difference]: With dead ends: 80 [2021-05-02 23:01:39,845 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 23:01:39,846 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 60.8ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 23:01:39,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 23:01:39,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 34. [2021-05-02 23:01:39,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 28 states have (on average 1.25) internal successors, (35), 28 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:39,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2021-05-02 23:01:39,855 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 19 [2021-05-02 23:01:39,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:39,855 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2021-05-02 23:01:39,855 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 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) [2021-05-02 23:01:39,856 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2021-05-02 23:01:39,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 23:01:39,856 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:39,857 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:39,857 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 23:01:39,857 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:39,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:39,858 INFO L82 PathProgramCache]: Analyzing trace with hash 470194446, now seen corresponding path program 1 times [2021-05-02 23:01:39,858 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:39,858 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1898509024] [2021-05-02 23:01:39,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:39,873 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:39,875 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:39,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:40,113 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:40,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:40,140 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:40,141 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:40,141 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1898509024] [2021-05-02 23:01:40,141 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1898509024] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:40,141 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:40,141 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-02 23:01:40,141 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369098859] [2021-05-02 23:01:40,142 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 23:01:40,142 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:40,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 23:01:40,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 23:01:40,143 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 9 states, 8 states have (on average 2.625) internal successors, (21), 7 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) [2021-05-02 23:01:40,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:40,443 INFO L93 Difference]: Finished difference Result 78 states and 97 transitions. [2021-05-02 23:01:40,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 23:01:40,444 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.625) internal successors, (21), 7 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 [2021-05-02 23:01:40,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:40,448 INFO L225 Difference]: With dead ends: 78 [2021-05-02 23:01:40,448 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 23:01:40,451 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 173.8ms TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-05-02 23:01:40,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 23:01:40,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 55. [2021-05-02 23:01:40,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 47 states have (on average 1.2765957446808511) internal successors, (60), 48 states have internal predecessors, (60), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:40,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 67 transitions. [2021-05-02 23:01:40,472 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 67 transitions. Word has length 25 [2021-05-02 23:01:40,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:40,473 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 67 transitions. [2021-05-02 23:01:40,473 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 2.625) internal successors, (21), 7 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) [2021-05-02 23:01:40,474 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 67 transitions. [2021-05-02 23:01:40,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 23:01:40,475 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:40,475 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:40,475 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 23:01:40,476 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:40,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:40,476 INFO L82 PathProgramCache]: Analyzing trace with hash -550873908, now seen corresponding path program 1 times [2021-05-02 23:01:40,476 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:40,477 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1593798538] [2021-05-02 23:01:40,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:40,480 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:40,482 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:40,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:40,555 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:40,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:40,563 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:40,564 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:40,564 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1593798538] [2021-05-02 23:01:40,564 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1593798538] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:40,564 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:40,564 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 23:01:40,564 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [365625736] [2021-05-02 23:01:40,565 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 23:01:40,565 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:40,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 23:01:40,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 23:01:40,566 INFO L87 Difference]: Start difference. First operand 55 states and 67 transitions. Second operand has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 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) [2021-05-02 23:01:40,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:40,656 INFO L93 Difference]: Finished difference Result 82 states and 101 transitions. [2021-05-02 23:01:40,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 23:01:40,657 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 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 [2021-05-02 23:01:40,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:40,658 INFO L225 Difference]: With dead ends: 82 [2021-05-02 23:01:40,658 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 23:01:40,659 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 28.2ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 23:01:40,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 23:01:40,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2021-05-02 23:01:40,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 48 states have (on average 1.2708333333333333) internal successors, (61), 49 states have internal predecessors, (61), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:40,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 68 transitions. [2021-05-02 23:01:40,667 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 68 transitions. Word has length 25 [2021-05-02 23:01:40,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:40,667 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 68 transitions. [2021-05-02 23:01:40,668 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 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) [2021-05-02 23:01:40,668 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 68 transitions. [2021-05-02 23:01:40,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 23:01:40,669 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:40,669 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:40,669 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 23:01:40,669 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:40,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:40,669 INFO L82 PathProgramCache]: Analyzing trace with hash -1439064257, now seen corresponding path program 1 times [2021-05-02 23:01:40,670 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:40,670 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1880469162] [2021-05-02 23:01:40,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:40,673 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:40,674 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:40,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:40,750 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:40,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:40,764 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:40,765 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:40,765 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1880469162] [2021-05-02 23:01:40,765 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1880469162] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:40,765 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:40,765 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-02 23:01:40,765 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900056323] [2021-05-02 23:01:40,766 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 23:01:40,766 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:40,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 23:01:40,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 23:01:40,767 INFO L87 Difference]: Start difference. First operand 56 states and 68 transitions. Second operand has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:01:40,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:40,923 INFO L93 Difference]: Finished difference Result 130 states and 165 transitions. [2021-05-02 23:01:40,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 23:01:40,924 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-05-02 23:01:40,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:40,925 INFO L225 Difference]: With dead ends: 130 [2021-05-02 23:01:40,925 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 23:01:40,926 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 44.5ms TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 23:01:40,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 23:01:40,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 68. [2021-05-02 23:01:40,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 60 states have (on average 1.2833333333333334) internal successors, (77), 61 states have internal predecessors, (77), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:40,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 84 transitions. [2021-05-02 23:01:40,952 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 84 transitions. Word has length 28 [2021-05-02 23:01:40,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:40,953 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 84 transitions. [2021-05-02 23:01:40,953 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:01:40,953 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 84 transitions. [2021-05-02 23:01:40,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 23:01:40,959 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:40,959 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:40,959 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-02 23:01:40,960 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:40,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:40,960 INFO L82 PathProgramCache]: Analyzing trace with hash 244787668, now seen corresponding path program 1 times [2021-05-02 23:01:40,961 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:40,964 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1458351319] [2021-05-02 23:01:40,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:40,971 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:40,973 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:40,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:41,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:41,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:41,080 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:41,081 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:41,081 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1458351319] [2021-05-02 23:01:41,081 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1458351319] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:41,081 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:41,081 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-02 23:01:41,081 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235320334] [2021-05-02 23:01:41,082 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 23:01:41,082 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:41,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 23:01:41,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-05-02 23:01:41,083 INFO L87 Difference]: Start difference. First operand 68 states and 84 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:01:41,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:41,357 INFO L93 Difference]: Finished difference Result 178 states and 225 transitions. [2021-05-02 23:01:41,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 23:01:41,357 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-05-02 23:01:41,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:41,359 INFO L225 Difference]: With dead ends: 178 [2021-05-02 23:01:41,360 INFO L226 Difference]: Without dead ends: 148 [2021-05-02 23:01:41,360 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 79.3ms TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2021-05-02 23:01:41,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-05-02 23:01:41,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 87. [2021-05-02 23:01:41,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 79 states have (on average 1.3037974683544304) internal successors, (103), 80 states have internal predecessors, (103), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:41,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 110 transitions. [2021-05-02 23:01:41,395 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 110 transitions. Word has length 28 [2021-05-02 23:01:41,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:41,395 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 110 transitions. [2021-05-02 23:01:41,395 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:01:41,395 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 110 transitions. [2021-05-02 23:01:41,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 23:01:41,398 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:41,398 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:41,398 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-02 23:01:41,399 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:41,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:41,399 INFO L82 PathProgramCache]: Analyzing trace with hash 777875589, now seen corresponding path program 1 times [2021-05-02 23:01:41,399 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:41,399 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [309441245] [2021-05-02 23:01:41,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:41,407 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:41,408 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:41,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:42,053 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:42,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:42,060 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:42,061 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:42,061 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [309441245] [2021-05-02 23:01:42,062 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [309441245] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:42,062 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:42,062 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-02 23:01:42,062 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228905802] [2021-05-02 23:01:42,064 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 23:01:42,064 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:42,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 23:01:42,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2021-05-02 23:01:42,065 INFO L87 Difference]: Start difference. First operand 87 states and 110 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) [2021-05-02 23:01:42,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:42,695 INFO L93 Difference]: Finished difference Result 177 states and 227 transitions. [2021-05-02 23:01:42,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 23:01:42,695 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 [2021-05-02 23:01:42,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:42,697 INFO L225 Difference]: With dead ends: 177 [2021-05-02 23:01:42,698 INFO L226 Difference]: Without dead ends: 175 [2021-05-02 23:01:42,698 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 607.1ms TimeCoverageRelationStatistics Valid=141, Invalid=459, Unknown=0, NotChecked=0, Total=600 [2021-05-02 23:01:42,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2021-05-02 23:01:42,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 89. [2021-05-02 23:01:42,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 81 states have (on average 1.3209876543209877) internal successors, (107), 82 states have internal predecessors, (107), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:42,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 114 transitions. [2021-05-02 23:01:42,715 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 114 transitions. Word has length 31 [2021-05-02 23:01:42,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:42,715 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 114 transitions. [2021-05-02 23:01:42,715 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) [2021-05-02 23:01:42,715 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 114 transitions. [2021-05-02 23:01:42,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 23:01:42,716 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:42,716 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:42,716 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-02 23:01:42,716 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:42,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:42,717 INFO L82 PathProgramCache]: Analyzing trace with hash 1819082994, now seen corresponding path program 2 times [2021-05-02 23:01:42,717 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:42,717 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1516584246] [2021-05-02 23:01:42,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:42,724 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:42,725 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:42,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:42,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:42,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:42,875 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:42,875 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:42,876 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1516584246] [2021-05-02 23:01:42,876 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1516584246] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:42,876 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:42,876 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-02 23:01:42,876 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771307709] [2021-05-02 23:01:42,876 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 23:01:42,876 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:42,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 23:01:42,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 23:01:42,877 INFO L87 Difference]: Start difference. First operand 89 states and 114 transitions. Second operand has 11 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:01:43,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:43,291 INFO L93 Difference]: Finished difference Result 218 states and 287 transitions. [2021-05-02 23:01:43,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 23:01:43,292 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have 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 [2021-05-02 23:01:43,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:43,294 INFO L225 Difference]: With dead ends: 218 [2021-05-02 23:01:43,294 INFO L226 Difference]: Without dead ends: 216 [2021-05-02 23:01:43,295 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 217.3ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-02 23:01:43,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2021-05-02 23:01:43,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 112. [2021-05-02 23:01:43,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 104 states have (on average 1.3557692307692308) internal successors, (141), 105 states have internal predecessors, (141), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:43,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 148 transitions. [2021-05-02 23:01:43,318 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 148 transitions. Word has length 31 [2021-05-02 23:01:43,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:43,318 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 148 transitions. [2021-05-02 23:01:43,318 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:01:43,318 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 148 transitions. [2021-05-02 23:01:43,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 23:01:43,320 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:43,320 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:43,321 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-02 23:01:43,321 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:43,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:43,322 INFO L82 PathProgramCache]: Analyzing trace with hash -12240024, now seen corresponding path program 1 times [2021-05-02 23:01:43,322 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:43,322 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [45679407] [2021-05-02 23:01:43,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:43,326 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:43,327 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:43,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:43,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:43,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:43,408 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-05-02 23:01:43,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:43,419 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:43,419 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:43,419 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [45679407] [2021-05-02 23:01:43,419 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [45679407] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:43,420 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:43,420 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-02 23:01:43,420 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229695616] [2021-05-02 23:01:43,420 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 23:01:43,420 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:43,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 23:01:43,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 23:01:43,421 INFO L87 Difference]: Start difference. First operand 112 states and 148 transitions. Second operand has 8 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:43,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:43,616 INFO L93 Difference]: Finished difference Result 254 states and 333 transitions. [2021-05-02 23:01:43,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 23:01:43,617 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 33 [2021-05-02 23:01:43,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:43,619 INFO L225 Difference]: With dead ends: 254 [2021-05-02 23:01:43,619 INFO L226 Difference]: Without dead ends: 185 [2021-05-02 23:01:43,619 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 55.9ms TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-05-02 23:01:43,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-05-02 23:01:43,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 131. [2021-05-02 23:01:43,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 122 states have (on average 1.3442622950819672) internal successors, (164), 124 states have internal predecessors, (164), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:43,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 172 transitions. [2021-05-02 23:01:43,652 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 172 transitions. Word has length 33 [2021-05-02 23:01:43,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:43,653 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 172 transitions. [2021-05-02 23:01:43,653 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:43,653 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 172 transitions. [2021-05-02 23:01:43,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 23:01:43,654 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:43,654 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:43,654 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-02 23:01:43,654 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:43,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:43,655 INFO L82 PathProgramCache]: Analyzing trace with hash -1882894858, now seen corresponding path program 2 times [2021-05-02 23:01:43,655 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:43,655 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [602485756] [2021-05-02 23:01:43,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:43,658 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:43,659 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:43,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:43,733 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:43,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:43,740 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:43,740 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:43,740 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [602485756] [2021-05-02 23:01:43,740 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [602485756] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:43,740 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:43,740 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-02 23:01:43,741 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [363413996] [2021-05-02 23:01:43,742 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 23:01:43,742 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:43,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 23:01:43,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 23:01:43,743 INFO L87 Difference]: Start difference. First operand 131 states and 172 transitions. Second operand has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:01:44,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:44,009 INFO L93 Difference]: Finished difference Result 240 states and 310 transitions. [2021-05-02 23:01:44,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 23:01:44,010 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-02 23:01:44,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:44,014 INFO L225 Difference]: With dead ends: 240 [2021-05-02 23:01:44,014 INFO L226 Difference]: Without dead ends: 219 [2021-05-02 23:01:44,018 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 90.3ms TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2021-05-02 23:01:44,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2021-05-02 23:01:44,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 174. [2021-05-02 23:01:44,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 165 states have (on average 1.3393939393939394) internal successors, (221), 167 states have internal predecessors, (221), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:44,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 229 transitions. [2021-05-02 23:01:44,042 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 229 transitions. Word has length 34 [2021-05-02 23:01:44,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:44,043 INFO L480 AbstractCegarLoop]: Abstraction has 174 states and 229 transitions. [2021-05-02 23:01:44,043 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:01:44,043 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 229 transitions. [2021-05-02 23:01:44,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 23:01:44,044 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:44,044 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:44,044 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-02 23:01:44,044 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:44,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:44,045 INFO L82 PathProgramCache]: Analyzing trace with hash -1856507910, now seen corresponding path program 3 times [2021-05-02 23:01:44,045 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:44,045 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [484131259] [2021-05-02 23:01:44,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:44,052 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:44,054 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:44,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:44,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:44,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:44,113 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:44,113 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:44,113 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [484131259] [2021-05-02 23:01:44,113 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [484131259] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:44,113 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:44,113 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 23:01:44,114 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728364437] [2021-05-02 23:01:44,114 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 23:01:44,114 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:44,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 23:01:44,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 23:01:44,116 INFO L87 Difference]: Start difference. First operand 174 states and 229 transitions. Second operand has 5 states, 5 states have (on average 5.2) internal successors, (26), 4 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:01:44,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:44,228 INFO L93 Difference]: Finished difference Result 248 states and 320 transitions. [2021-05-02 23:01:44,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 23:01:44,229 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.2) internal successors, (26), 4 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-02 23:01:44,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:44,230 INFO L225 Difference]: With dead ends: 248 [2021-05-02 23:01:44,230 INFO L226 Difference]: Without dead ends: 143 [2021-05-02 23:01:44,231 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 29.7ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 23:01:44,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-05-02 23:01:44,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 140. [2021-05-02 23:01:44,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 131 states have (on average 1.297709923664122) internal successors, (170), 133 states have internal predecessors, (170), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:44,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 178 transitions. [2021-05-02 23:01:44,250 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 178 transitions. Word has length 34 [2021-05-02 23:01:44,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:44,250 INFO L480 AbstractCegarLoop]: Abstraction has 140 states and 178 transitions. [2021-05-02 23:01:44,250 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 5.2) internal successors, (26), 4 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:01:44,250 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 178 transitions. [2021-05-02 23:01:44,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 23:01:44,251 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:44,252 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:44,252 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-05-02 23:01:44,252 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:44,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:44,252 INFO L82 PathProgramCache]: Analyzing trace with hash -1637653192, now seen corresponding path program 4 times [2021-05-02 23:01:44,253 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:44,253 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1420192682] [2021-05-02 23:01:44,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:44,265 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:44,267 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:44,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:44,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:44,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:44,390 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:44,390 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:44,390 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1420192682] [2021-05-02 23:01:44,390 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1420192682] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:44,391 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:44,391 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-02 23:01:44,391 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134449646] [2021-05-02 23:01:44,391 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 23:01:44,391 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:44,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 23:01:44,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 23:01:44,392 INFO L87 Difference]: Start difference. First operand 140 states and 178 transitions. Second operand has 10 states, 10 states have (on average 3.0) internal successors, (30), 9 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:01:44,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:44,809 INFO L93 Difference]: Finished difference Result 346 states and 441 transitions. [2021-05-02 23:01:44,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 23:01:44,810 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 9 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-02 23:01:44,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:44,813 INFO L225 Difference]: With dead ends: 346 [2021-05-02 23:01:44,813 INFO L226 Difference]: Without dead ends: 308 [2021-05-02 23:01:44,814 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 126.2ms TimeCoverageRelationStatistics Valid=52, Invalid=158, Unknown=0, NotChecked=0, Total=210 [2021-05-02 23:01:44,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2021-05-02 23:01:44,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 173. [2021-05-02 23:01:44,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 164 states have (on average 1.3048780487804879) internal successors, (214), 166 states have internal predecessors, (214), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:44,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 222 transitions. [2021-05-02 23:01:44,839 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 222 transitions. Word has length 34 [2021-05-02 23:01:44,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:44,839 INFO L480 AbstractCegarLoop]: Abstraction has 173 states and 222 transitions. [2021-05-02 23:01:44,840 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 9 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:01:44,841 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 222 transitions. [2021-05-02 23:01:44,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 23:01:44,841 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:44,841 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:44,842 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-02 23:01:44,842 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:44,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:44,842 INFO L82 PathProgramCache]: Analyzing trace with hash -1470221714, now seen corresponding path program 3 times [2021-05-02 23:01:44,842 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:44,842 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2056665999] [2021-05-02 23:01:44,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:44,849 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:44,850 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:44,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:45,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:45,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:45,525 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:45,526 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:45,526 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2056665999] [2021-05-02 23:01:45,526 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2056665999] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:45,526 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:45,526 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-02 23:01:45,526 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [993926038] [2021-05-02 23:01:45,526 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 23:01:45,526 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:45,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 23:01:45,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-02 23:01:45,527 INFO L87 Difference]: Start difference. First operand 173 states and 222 transitions. Second operand has 18 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 16 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) [2021-05-02 23:01:46,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:46,017 INFO L93 Difference]: Finished difference Result 200 states and 252 transitions. [2021-05-02 23:01:46,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 23:01:46,018 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 16 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 [2021-05-02 23:01:46,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:46,019 INFO L225 Difference]: With dead ends: 200 [2021-05-02 23:01:46,019 INFO L226 Difference]: Without dead ends: 181 [2021-05-02 23:01:46,020 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 683.3ms TimeCoverageRelationStatistics Valid=116, Invalid=484, Unknown=0, NotChecked=0, Total=600 [2021-05-02 23:01:46,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2021-05-02 23:01:46,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 176. [2021-05-02 23:01:46,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 167 states have (on average 1.3053892215568863) internal successors, (218), 169 states have internal predecessors, (218), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:46,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 226 transitions. [2021-05-02 23:01:46,041 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 226 transitions. Word has length 37 [2021-05-02 23:01:46,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:46,041 INFO L480 AbstractCegarLoop]: Abstraction has 176 states and 226 transitions. [2021-05-02 23:01:46,041 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 16 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) [2021-05-02 23:01:46,041 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 226 transitions. [2021-05-02 23:01:46,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 23:01:46,042 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:46,042 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:46,042 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-05-02 23:01:46,043 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:46,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:46,043 INFO L82 PathProgramCache]: Analyzing trace with hash -651731607, now seen corresponding path program 1 times [2021-05-02 23:01:46,043 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:46,043 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1022674207] [2021-05-02 23:01:46,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:46,049 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:46,050 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:46,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:46,103 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:46,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:46,108 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:46,108 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:46,108 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1022674207] [2021-05-02 23:01:46,109 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1022674207] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:46,109 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:46,109 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 23:01:46,109 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087791030] [2021-05-02 23:01:46,109 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 23:01:46,109 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:46,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 23:01:46,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 23:01:46,110 INFO L87 Difference]: Start difference. First operand 176 states and 226 transitions. Second operand has 6 states, 6 states have (on average 5.166666666666667) internal successors, (31), 5 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) [2021-05-02 23:01:46,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:46,221 INFO L93 Difference]: Finished difference Result 280 states and 361 transitions. [2021-05-02 23:01:46,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 23:01:46,221 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.166666666666667) internal successors, (31), 5 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 37 [2021-05-02 23:01:46,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:46,223 INFO L225 Difference]: With dead ends: 280 [2021-05-02 23:01:46,223 INFO L226 Difference]: Without dead ends: 200 [2021-05-02 23:01:46,223 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 31.8ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 23:01:46,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-05-02 23:01:46,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 178. [2021-05-02 23:01:46,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 169 states have (on average 1.2840236686390532) internal successors, (217), 171 states have internal predecessors, (217), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:46,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 225 transitions. [2021-05-02 23:01:46,245 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 225 transitions. Word has length 37 [2021-05-02 23:01:46,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:46,245 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 225 transitions. [2021-05-02 23:01:46,245 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 5.166666666666667) internal successors, (31), 5 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) [2021-05-02 23:01:46,246 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 225 transitions. [2021-05-02 23:01:46,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 23:01:46,246 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:46,246 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:46,246 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-02 23:01:46,247 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:46,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:46,247 INFO L82 PathProgramCache]: Analyzing trace with hash 1411406606, now seen corresponding path program 5 times [2021-05-02 23:01:46,247 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:46,247 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [247818086] [2021-05-02 23:01:46,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:46,254 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:46,255 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:46,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:46,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:46,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:46,466 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:46,467 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:46,467 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [247818086] [2021-05-02 23:01:46,467 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [247818086] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:46,467 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:46,467 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-02 23:01:46,467 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2017855659] [2021-05-02 23:01:46,467 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 23:01:46,468 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:46,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 23:01:46,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-05-02 23:01:46,468 INFO L87 Difference]: Start difference. First operand 178 states and 225 transitions. Second operand has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 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) [2021-05-02 23:01:46,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:46,871 INFO L93 Difference]: Finished difference Result 268 states and 341 transitions. [2021-05-02 23:01:46,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 23:01:46,872 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 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 37 [2021-05-02 23:01:46,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:46,874 INFO L225 Difference]: With dead ends: 268 [2021-05-02 23:01:46,874 INFO L226 Difference]: Without dead ends: 266 [2021-05-02 23:01:46,877 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 242.7ms TimeCoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-05-02 23:01:46,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2021-05-02 23:01:46,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 162. [2021-05-02 23:01:46,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 153 states have (on average 1.2810457516339868) internal successors, (196), 155 states have internal predecessors, (196), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:46,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 204 transitions. [2021-05-02 23:01:46,905 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 204 transitions. Word has length 37 [2021-05-02 23:01:46,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:46,907 INFO L480 AbstractCegarLoop]: Abstraction has 162 states and 204 transitions. [2021-05-02 23:01:46,907 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 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) [2021-05-02 23:01:46,907 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 204 transitions. [2021-05-02 23:01:46,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 23:01:46,908 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:46,908 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:46,908 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-02 23:01:46,908 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:46,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:46,908 INFO L82 PathProgramCache]: Analyzing trace with hash 524779340, now seen corresponding path program 1 times [2021-05-02 23:01:46,909 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:46,909 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1662212354] [2021-05-02 23:01:46,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:46,914 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:46,915 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:46,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:47,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:47,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:47,113 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-05-02 23:01:47,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:47,119 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:47,120 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:47,120 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1662212354] [2021-05-02 23:01:47,120 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1662212354] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:47,120 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:47,120 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-02 23:01:47,120 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715258743] [2021-05-02 23:01:47,121 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 23:01:47,121 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:47,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 23:01:47,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-05-02 23:01:47,121 INFO L87 Difference]: Start difference. First operand 162 states and 204 transitions. Second operand has 12 states, 11 states have (on average 2.727272727272727) internal successors, (30), 10 states have internal predecessors, (30), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:47,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:47,657 INFO L93 Difference]: Finished difference Result 312 states and 399 transitions. [2021-05-02 23:01:47,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 23:01:47,657 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.727272727272727) internal successors, (30), 10 states have internal predecessors, (30), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 39 [2021-05-02 23:01:47,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:47,659 INFO L225 Difference]: With dead ends: 312 [2021-05-02 23:01:47,659 INFO L226 Difference]: Without dead ends: 310 [2021-05-02 23:01:47,659 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 261.0ms TimeCoverageRelationStatistics Valid=77, Invalid=303, Unknown=0, NotChecked=0, Total=380 [2021-05-02 23:01:47,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2021-05-02 23:01:47,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 231. [2021-05-02 23:01:47,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 231 states, 219 states have (on average 1.2831050228310503) internal successors, (281), 222 states have internal predecessors, (281), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 23:01:47,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 293 transitions. [2021-05-02 23:01:47,697 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 293 transitions. Word has length 39 [2021-05-02 23:01:47,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:47,698 INFO L480 AbstractCegarLoop]: Abstraction has 231 states and 293 transitions. [2021-05-02 23:01:47,698 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 2.727272727272727) internal successors, (30), 10 states have internal predecessors, (30), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:47,698 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 293 transitions. [2021-05-02 23:01:47,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 23:01:47,699 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:47,699 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:47,700 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-05-02 23:01:47,700 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:47,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:47,700 INFO L82 PathProgramCache]: Analyzing trace with hash 994866975, now seen corresponding path program 4 times [2021-05-02 23:01:47,700 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:47,700 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [7423026] [2021-05-02 23:01:47,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:47,703 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:47,704 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:47,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:47,797 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:47,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:47,805 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:47,805 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:47,805 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [7423026] [2021-05-02 23:01:47,805 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [7423026] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:47,805 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:47,805 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-02 23:01:47,806 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007349059] [2021-05-02 23:01:47,806 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 23:01:47,806 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:47,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 23:01:47,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 23:01:47,807 INFO L87 Difference]: Start difference. First operand 231 states and 293 transitions. Second operand has 10 states, 10 states have (on average 3.6) internal successors, (36), 9 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:01:48,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:48,253 INFO L93 Difference]: Finished difference Result 498 states and 642 transitions. [2021-05-02 23:01:48,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 23:01:48,254 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.6) internal successors, (36), 9 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2021-05-02 23:01:48,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:48,256 INFO L225 Difference]: With dead ends: 498 [2021-05-02 23:01:48,256 INFO L226 Difference]: Without dead ends: 466 [2021-05-02 23:01:48,257 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 129.3ms TimeCoverageRelationStatistics Valid=86, Invalid=256, Unknown=0, NotChecked=0, Total=342 [2021-05-02 23:01:48,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2021-05-02 23:01:48,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 315. [2021-05-02 23:01:48,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 315 states, 303 states have (on average 1.3135313531353134) internal successors, (398), 306 states have internal predecessors, (398), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 23:01:48,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 410 transitions. [2021-05-02 23:01:48,311 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 410 transitions. Word has length 40 [2021-05-02 23:01:48,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:48,311 INFO L480 AbstractCegarLoop]: Abstraction has 315 states and 410 transitions. [2021-05-02 23:01:48,311 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.6) internal successors, (36), 9 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:01:48,311 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 410 transitions. [2021-05-02 23:01:48,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 23:01:48,312 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:48,312 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:48,312 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-05-02 23:01:48,312 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:48,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:48,313 INFO L82 PathProgramCache]: Analyzing trace with hash -1497733084, now seen corresponding path program 2 times [2021-05-02 23:01:48,313 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:48,313 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [608379611] [2021-05-02 23:01:48,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:48,318 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:48,320 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:48,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:48,895 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:48,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:48,905 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:48,905 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:48,905 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [608379611] [2021-05-02 23:01:48,905 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [608379611] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:48,906 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:48,906 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-02 23:01:48,906 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897106978] [2021-05-02 23:01:48,906 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 23:01:48,906 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:48,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 23:01:48,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-02 23:01:48,907 INFO L87 Difference]: Start difference. First operand 315 states and 410 transitions. Second operand has 16 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 14 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) [2021-05-02 23:01:49,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:49,901 INFO L93 Difference]: Finished difference Result 734 states and 962 transitions. [2021-05-02 23:01:49,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 23:01:49,902 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 14 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 40 [2021-05-02 23:01:49,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:49,905 INFO L225 Difference]: With dead ends: 734 [2021-05-02 23:01:49,905 INFO L226 Difference]: Without dead ends: 732 [2021-05-02 23:01:49,906 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 756.6ms TimeCoverageRelationStatistics Valid=142, Invalid=560, Unknown=0, NotChecked=0, Total=702 [2021-05-02 23:01:49,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 732 states. [2021-05-02 23:01:49,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 732 to 490. [2021-05-02 23:01:49,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 490 states, 478 states have (on average 1.3577405857740585) internal successors, (649), 481 states have internal predecessors, (649), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 23:01:49,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 661 transitions. [2021-05-02 23:01:49,989 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 661 transitions. Word has length 40 [2021-05-02 23:01:49,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:49,990 INFO L480 AbstractCegarLoop]: Abstraction has 490 states and 661 transitions. [2021-05-02 23:01:49,990 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 14 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) [2021-05-02 23:01:49,990 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 661 transitions. [2021-05-02 23:01:49,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 23:01:49,991 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:49,991 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:49,991 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-02 23:01:49,991 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:49,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:49,992 INFO L82 PathProgramCache]: Analyzing trace with hash -1909650267, now seen corresponding path program 5 times [2021-05-02 23:01:49,992 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:49,992 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1407338943] [2021-05-02 23:01:49,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:49,994 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:49,995 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:50,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:51,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:51,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:51,009 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:51,010 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:51,010 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1407338943] [2021-05-02 23:01:51,010 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1407338943] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:51,010 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:51,010 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-02 23:01:51,010 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236222680] [2021-05-02 23:01:51,010 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 23:01:51,010 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:51,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 23:01:51,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=347, Unknown=0, NotChecked=0, Total=420 [2021-05-02 23:01:51,011 INFO L87 Difference]: Start difference. First operand 490 states and 661 transitions. Second operand has 21 states, 20 states have (on average 1.8) internal successors, (36), 19 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:01:51,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:51,741 INFO L93 Difference]: Finished difference Result 520 states and 694 transitions. [2021-05-02 23:01:51,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 23:01:51,745 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.8) internal successors, (36), 19 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have 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 [2021-05-02 23:01:51,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:51,747 INFO L225 Difference]: With dead ends: 520 [2021-05-02 23:01:51,747 INFO L226 Difference]: Without dead ends: 498 [2021-05-02 23:01:51,747 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 1131.9ms TimeCoverageRelationStatistics Valid=152, Invalid=718, Unknown=0, NotChecked=0, Total=870 [2021-05-02 23:01:51,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 498 states. [2021-05-02 23:01:51,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 498 to 493. [2021-05-02 23:01:51,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 493 states, 481 states have (on average 1.3575883575883576) internal successors, (653), 484 states have internal predecessors, (653), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 23:01:51,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 493 states to 493 states and 665 transitions. [2021-05-02 23:01:51,826 INFO L78 Accepts]: Start accepts. Automaton has 493 states and 665 transitions. Word has length 43 [2021-05-02 23:01:51,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:51,826 INFO L480 AbstractCegarLoop]: Abstraction has 493 states and 665 transitions. [2021-05-02 23:01:51,826 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 1.8) internal successors, (36), 19 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:01:51,826 INFO L276 IsEmpty]: Start isEmpty. Operand 493 states and 665 transitions. [2021-05-02 23:01:51,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 23:01:51,827 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:51,827 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:51,828 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-05-02 23:01:51,828 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:51,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:51,828 INFO L82 PathProgramCache]: Analyzing trace with hash -383539670, now seen corresponding path program 2 times [2021-05-02 23:01:51,828 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:51,828 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1691485031] [2021-05-02 23:01:51,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:51,835 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:51,836 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:51,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:51,910 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:51,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:51,914 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-05-02 23:01:51,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:51,917 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:51,917 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:51,917 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1691485031] [2021-05-02 23:01:51,917 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1691485031] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:51,917 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:51,917 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-02 23:01:51,917 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488244581] [2021-05-02 23:01:51,918 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 23:01:51,918 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:51,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 23:01:51,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-05-02 23:01:51,918 INFO L87 Difference]: Start difference. First operand 493 states and 665 transitions. Second operand has 10 states, 10 states have (on average 3.2) internal successors, (32), 9 states have internal predecessors, (32), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:52,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:52,222 INFO L93 Difference]: Finished difference Result 844 states and 1125 transitions. [2021-05-02 23:01:52,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 23:01:52,222 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.2) internal successors, (32), 9 states have internal predecessors, (32), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 45 [2021-05-02 23:01:52,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:52,225 INFO L225 Difference]: With dead ends: 844 [2021-05-02 23:01:52,225 INFO L226 Difference]: Without dead ends: 535 [2021-05-02 23:01:52,226 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 103.6ms TimeCoverageRelationStatistics Valid=68, Invalid=172, Unknown=0, NotChecked=0, Total=240 [2021-05-02 23:01:52,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 535 states. [2021-05-02 23:01:52,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 535 to 407. [2021-05-02 23:01:52,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 407 states, 395 states have (on average 1.3341772151898734) internal successors, (527), 398 states have internal predecessors, (527), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 23:01:52,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 407 states to 407 states and 539 transitions. [2021-05-02 23:01:52,295 INFO L78 Accepts]: Start accepts. Automaton has 407 states and 539 transitions. Word has length 45 [2021-05-02 23:01:52,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:52,295 INFO L480 AbstractCegarLoop]: Abstraction has 407 states and 539 transitions. [2021-05-02 23:01:52,295 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.2) internal successors, (32), 9 states have internal predecessors, (32), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:52,295 INFO L276 IsEmpty]: Start isEmpty. Operand 407 states and 539 transitions. [2021-05-02 23:01:52,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 23:01:52,296 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:52,296 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:52,296 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-05-02 23:01:52,297 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:52,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:52,297 INFO L82 PathProgramCache]: Analyzing trace with hash 651363238, now seen corresponding path program 3 times [2021-05-02 23:01:52,297 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:52,297 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1301160589] [2021-05-02 23:01:52,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:52,303 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:52,304 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:52,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:52,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:52,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:52,387 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-05-02 23:01:52,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:52,389 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-05-02 23:01:52,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:52,391 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:52,392 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:52,392 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1301160589] [2021-05-02 23:01:52,392 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1301160589] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:52,392 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:52,392 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-02 23:01:52,392 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [622954573] [2021-05-02 23:01:52,392 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 23:01:52,392 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:52,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 23:01:52,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-05-02 23:01:52,393 INFO L87 Difference]: Start difference. First operand 407 states and 539 transitions. Second operand has 10 states, 10 states have (on average 3.3) internal successors, (33), 9 states have internal predecessors, (33), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:52,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:52,832 INFO L93 Difference]: Finished difference Result 775 states and 1004 transitions. [2021-05-02 23:01:52,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 23:01:52,832 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 9 states have internal predecessors, (33), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 47 [2021-05-02 23:01:52,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:52,835 INFO L225 Difference]: With dead ends: 775 [2021-05-02 23:01:52,835 INFO L226 Difference]: Without dead ends: 595 [2021-05-02 23:01:52,836 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 126.3ms TimeCoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2021-05-02 23:01:52,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 595 states. [2021-05-02 23:01:52,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 595 to 440. [2021-05-02 23:01:52,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 440 states, 426 states have (on average 1.307511737089202) internal successors, (557), 430 states have internal predecessors, (557), 9 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (7), 4 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 23:01:52,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 440 states to 440 states and 573 transitions. [2021-05-02 23:01:52,910 INFO L78 Accepts]: Start accepts. Automaton has 440 states and 573 transitions. Word has length 47 [2021-05-02 23:01:52,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:52,910 INFO L480 AbstractCegarLoop]: Abstraction has 440 states and 573 transitions. [2021-05-02 23:01:52,910 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 9 states have internal predecessors, (33), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:01:52,910 INFO L276 IsEmpty]: Start isEmpty. Operand 440 states and 573 transitions. [2021-05-02 23:01:52,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 23:01:52,911 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:52,911 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:52,911 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-05-02 23:01:52,911 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:52,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:52,912 INFO L82 PathProgramCache]: Analyzing trace with hash 1904691350, now seen corresponding path program 6 times [2021-05-02 23:01:52,912 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:52,912 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1115595102] [2021-05-02 23:01:52,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:52,914 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:52,915 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:52,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:53,009 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:53,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:53,013 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:53,013 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:53,013 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1115595102] [2021-05-02 23:01:53,014 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1115595102] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:53,014 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:53,014 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-02 23:01:53,014 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892239514] [2021-05-02 23:01:53,014 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 23:01:53,014 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:53,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 23:01:53,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-02 23:01:53,015 INFO L87 Difference]: Start difference. First operand 440 states and 573 transitions. Second operand has 12 states, 12 states have (on average 3.5) internal successors, (42), 11 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:01:53,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:53,571 INFO L93 Difference]: Finished difference Result 1037 states and 1338 transitions. [2021-05-02 23:01:53,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 23:01:53,571 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.5) internal successors, (42), 11 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2021-05-02 23:01:53,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:53,575 INFO L225 Difference]: With dead ends: 1037 [2021-05-02 23:01:53,575 INFO L226 Difference]: Without dead ends: 997 [2021-05-02 23:01:53,576 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 175.4ms TimeCoverageRelationStatistics Valid=139, Invalid=413, Unknown=0, NotChecked=0, Total=552 [2021-05-02 23:01:53,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 997 states. [2021-05-02 23:01:53,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 997 to 597. [2021-05-02 23:01:53,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 597 states, 583 states have (on average 1.3379073756432247) internal successors, (780), 587 states have internal predecessors, (780), 9 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (7), 4 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 23:01:53,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 597 states to 597 states and 796 transitions. [2021-05-02 23:01:53,699 INFO L78 Accepts]: Start accepts. Automaton has 597 states and 796 transitions. Word has length 46 [2021-05-02 23:01:53,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:53,699 INFO L480 AbstractCegarLoop]: Abstraction has 597 states and 796 transitions. [2021-05-02 23:01:53,699 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.5) internal successors, (42), 11 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:01:53,700 INFO L276 IsEmpty]: Start isEmpty. Operand 597 states and 796 transitions. [2021-05-02 23:01:53,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 23:01:53,701 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:53,701 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:53,701 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-05-02 23:01:53,701 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:53,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:53,702 INFO L82 PathProgramCache]: Analyzing trace with hash 1776596685, now seen corresponding path program 3 times [2021-05-02 23:01:53,702 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:53,702 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1977502466] [2021-05-02 23:01:53,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:53,706 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:53,707 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:53,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:53,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:53,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:53,769 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:53,770 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:53,770 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1977502466] [2021-05-02 23:01:53,770 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1977502466] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:53,770 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:53,770 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-02 23:01:53,770 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [245551389] [2021-05-02 23:01:53,770 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 23:01:53,770 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:53,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 23:01:53,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 23:01:53,771 INFO L87 Difference]: Start difference. First operand 597 states and 796 transitions. Second operand has 8 states, 8 states have (on average 4.625) internal successors, (37), 7 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) [2021-05-02 23:01:54,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:54,022 INFO L93 Difference]: Finished difference Result 1132 states and 1484 transitions. [2021-05-02 23:01:54,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 23:01:54,023 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.625) internal successors, (37), 7 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 46 [2021-05-02 23:01:54,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:54,025 INFO L225 Difference]: With dead ends: 1132 [2021-05-02 23:01:54,026 INFO L226 Difference]: Without dead ends: 849 [2021-05-02 23:01:54,026 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 54.1ms TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-05-02 23:01:54,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 849 states. [2021-05-02 23:01:54,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 849 to 687. [2021-05-02 23:01:54,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 687 states, 673 states have (on average 1.325408618127786) internal successors, (892), 677 states have internal predecessors, (892), 9 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (7), 4 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 23:01:54,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 687 states to 687 states and 908 transitions. [2021-05-02 23:01:54,153 INFO L78 Accepts]: Start accepts. Automaton has 687 states and 908 transitions. Word has length 46 [2021-05-02 23:01:54,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:54,153 INFO L480 AbstractCegarLoop]: Abstraction has 687 states and 908 transitions. [2021-05-02 23:01:54,153 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.625) internal successors, (37), 7 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) [2021-05-02 23:01:54,153 INFO L276 IsEmpty]: Start isEmpty. Operand 687 states and 908 transitions. [2021-05-02 23:01:54,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 23:01:54,155 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:54,155 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:54,155 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-05-02 23:01:54,155 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:54,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:54,156 INFO L82 PathProgramCache]: Analyzing trace with hash -218065925, now seen corresponding path program 4 times [2021-05-02 23:01:54,156 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:54,156 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1573211039] [2021-05-02 23:01:54,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:54,161 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:54,162 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:54,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:54,229 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:54,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:54,232 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:54,232 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:54,233 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1573211039] [2021-05-02 23:01:54,233 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1573211039] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:54,233 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:54,233 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-02 23:01:54,233 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140061450] [2021-05-02 23:01:54,233 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 23:01:54,233 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:54,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 23:01:54,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-05-02 23:01:54,234 INFO L87 Difference]: Start difference. First operand 687 states and 908 transitions. Second operand has 8 states, 8 states have (on average 4.625) internal successors, (37), 7 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) [2021-05-02 23:01:54,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:54,481 INFO L93 Difference]: Finished difference Result 883 states and 1130 transitions. [2021-05-02 23:01:54,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 23:01:54,482 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.625) internal successors, (37), 7 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 46 [2021-05-02 23:01:54,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:54,484 INFO L225 Difference]: With dead ends: 883 [2021-05-02 23:01:54,484 INFO L226 Difference]: Without dead ends: 680 [2021-05-02 23:01:54,485 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 63.2ms TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2021-05-02 23:01:54,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 680 states. [2021-05-02 23:01:54,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 680 to 620. [2021-05-02 23:01:54,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 620 states, 606 states have (on average 1.297029702970297) internal successors, (786), 610 states have internal predecessors, (786), 9 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (7), 4 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 23:01:54,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 620 states to 620 states and 802 transitions. [2021-05-02 23:01:54,612 INFO L78 Accepts]: Start accepts. Automaton has 620 states and 802 transitions. Word has length 46 [2021-05-02 23:01:54,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:54,612 INFO L480 AbstractCegarLoop]: Abstraction has 620 states and 802 transitions. [2021-05-02 23:01:54,612 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.625) internal successors, (37), 7 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) [2021-05-02 23:01:54,612 INFO L276 IsEmpty]: Start isEmpty. Operand 620 states and 802 transitions. [2021-05-02 23:01:54,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-02 23:01:54,613 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:54,613 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:54,614 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-05-02 23:01:54,614 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:54,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:54,614 INFO L82 PathProgramCache]: Analyzing trace with hash 983274622, now seen corresponding path program 1 times [2021-05-02 23:01:54,614 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:54,614 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1403861049] [2021-05-02 23:01:54,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:54,619 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:54,620 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:54,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:55,387 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 109 DAG size of output: 62 [2021-05-02 23:01:55,552 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 56 [2021-05-02 23:01:55,939 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:01:55,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:55,954 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-05-02 23:01:55,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:01:55,995 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 23:01:55,996 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:01:55,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1403861049] [2021-05-02 23:01:55,996 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1403861049] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:01:55,996 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:01:55,996 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-02 23:01:55,996 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481395185] [2021-05-02 23:01:55,996 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 23:01:55,996 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:01:55,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 23:01:55,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=299, Unknown=0, NotChecked=0, Total=342 [2021-05-02 23:01:55,997 INFO L87 Difference]: Start difference. First operand 620 states and 802 transitions. Second operand has 19 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 18 states have internal predecessors, (42), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:56,368 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 62 [2021-05-02 23:01:57,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:01:57,383 INFO L93 Difference]: Finished difference Result 773 states and 988 transitions. [2021-05-02 23:01:57,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 23:01:57,384 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 18 states have internal predecessors, (42), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 48 [2021-05-02 23:01:57,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:01:57,385 INFO L225 Difference]: With dead ends: 773 [2021-05-02 23:01:57,385 INFO L226 Difference]: Without dead ends: 724 [2021-05-02 23:01:57,386 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 6 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 1811.2ms TimeCoverageRelationStatistics Valid=108, Invalid=762, Unknown=0, NotChecked=0, Total=870 [2021-05-02 23:01:57,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 724 states. [2021-05-02 23:01:57,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 724 to 642. [2021-05-02 23:01:57,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 642 states, 628 states have (on average 1.2961783439490446) internal successors, (814), 632 states have internal predecessors, (814), 9 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (7), 4 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 23:01:57,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 642 states to 642 states and 830 transitions. [2021-05-02 23:01:57,506 INFO L78 Accepts]: Start accepts. Automaton has 642 states and 830 transitions. Word has length 48 [2021-05-02 23:01:57,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:01:57,507 INFO L480 AbstractCegarLoop]: Abstraction has 642 states and 830 transitions. [2021-05-02 23:01:57,507 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 18 states have internal predecessors, (42), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 23:01:57,507 INFO L276 IsEmpty]: Start isEmpty. Operand 642 states and 830 transitions. [2021-05-02 23:01:57,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-02 23:01:57,508 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:01:57,508 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:01:57,508 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-05-02 23:01:57,508 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:01:57,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:01:57,509 INFO L82 PathProgramCache]: Analyzing trace with hash 849261116, now seen corresponding path program 1 times [2021-05-02 23:01:57,509 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:01:57,509 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [650488308] [2021-05-02 23:01:57,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:01:57,514 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:01:57,515 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:01:57,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 23:01:57,556 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 23:01:57,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 23:01:57,595 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 23:01:57,625 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2021-05-02 23:01:57,625 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-02 23:01:57,626 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-05-02 23:01:57,642 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 11:01:57 BoogieIcfgContainer [2021-05-02 23:01:57,642 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 23:01:57,643 INFO L168 Benchmark]: Toolchain (without parser) took 19527.76 ms. Allocated memory was 186.6 MB in the beginning and 467.7 MB in the end (delta: 281.0 MB). Free memory was 150.5 MB in the beginning and 254.6 MB in the end (delta: -104.0 MB). Peak memory consumption was 177.5 MB. Max. memory is 8.0 GB. [2021-05-02 23:01:57,643 INFO L168 Benchmark]: CDTParser took 0.14 ms. Allocated memory is still 186.6 MB. Free memory is still 167.3 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 23:01:57,643 INFO L168 Benchmark]: CACSL2BoogieTranslator took 305.30 ms. Allocated memory is still 186.6 MB. Free memory was 150.3 MB in the beginning and 168.1 MB in the end (delta: -17.7 MB). Peak memory consumption was 8.9 MB. Max. memory is 8.0 GB. [2021-05-02 23:01:57,643 INFO L168 Benchmark]: Boogie Preprocessor took 51.34 ms. Allocated memory is still 186.6 MB. Free memory was 168.1 MB in the beginning and 166.0 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-02 23:01:57,643 INFO L168 Benchmark]: RCFGBuilder took 452.98 ms. Allocated memory is still 186.6 MB. Free memory was 166.0 MB in the beginning and 142.9 MB in the end (delta: 23.1 MB). Peak memory consumption was 23.1 MB. Max. memory is 8.0 GB. [2021-05-02 23:01:57,643 INFO L168 Benchmark]: TraceAbstraction took 18711.43 ms. Allocated memory was 186.6 MB in the beginning and 467.7 MB in the end (delta: 281.0 MB). Free memory was 142.6 MB in the beginning and 254.6 MB in the end (delta: -112.0 MB). Peak memory consumption was 169.7 MB. Max. memory is 8.0 GB. [2021-05-02 23:01:57,643 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14 ms. Allocated memory is still 186.6 MB. Free memory is still 167.3 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 305.30 ms. Allocated memory is still 186.6 MB. Free memory was 150.3 MB in the beginning and 168.1 MB in the end (delta: -17.7 MB). Peak memory consumption was 8.9 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 51.34 ms. Allocated memory is still 186.6 MB. Free memory was 168.1 MB in the beginning and 166.0 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 452.98 ms. Allocated memory is still 186.6 MB. Free memory was 166.0 MB in the beginning and 142.9 MB in the end (delta: 23.1 MB). Peak memory consumption was 23.1 MB. Max. memory is 8.0 GB. * TraceAbstraction took 18711.43 ms. Allocated memory was 186.6 MB in the beginning and 467.7 MB in the end (delta: 281.0 MB). Free memory was 142.6 MB in the beginning and 254.6 MB in the end (delta: -112.0 MB). Peak memory consumption was 169.7 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 12]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L16] int INFINITY = 899; [L18] int nodecount = __VERIFIER_nondet_int(); [L19] int edgecount = __VERIFIER_nondet_int(); [L20] COND FALSE !(!(0 <= nodecount && nodecount <= 4)) [L21] COND FALSE !(!(0 <= edgecount && edgecount <= 19)) [L22] int source = 0; [L23] int Source[20] = {0,4,1,1,0,0,1,3,4,4,2,2,3,0,0,3,1,2,2,3}; [L24] int Dest[20] = {1,3,4,1,1,4,3,4,3,0,0,0,0,2,3,0,2,1,0,4}; [L25] int Weight[20] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19}; [L26] int distance[5]; [L27] int x,y; [L28] int i,j; [L30] i = 0 [L30] COND TRUE i < nodecount [L31] COND TRUE i == source [L32] distance[i] = 0 [L30] i++ [L30] COND TRUE i < nodecount [L31] COND FALSE !(i == source) [L35] distance[i] = INFINITY [L30] i++ [L30] COND FALSE !(i < nodecount) [L39] i = 0 [L39] COND TRUE i < nodecount [L41] j = 0 [L41] COND TRUE j < edgecount [L43] EXPR Dest[j] [L43] x = Dest[j] [L44] EXPR Source[j] [L44] y = Source[j] [L45] EXPR distance[x] [L45] EXPR distance[y] [L45] EXPR Weight[j] [L45] COND TRUE distance[x] > distance[y] + Weight[j] [L47] distance[x] = -1 [L41] j++ [L41] COND FALSE !(j < edgecount) [L39] i++ [L39] COND TRUE i < nodecount [L41] j = 0 [L41] COND TRUE j < edgecount [L43] EXPR Dest[j] [L43] x = Dest[j] [L44] EXPR Source[j] [L44] y = Source[j] [L45] EXPR distance[x] [L45] EXPR distance[y] [L45] EXPR Weight[j] [L45] COND FALSE !(distance[x] > distance[y] + Weight[j]) [L41] j++ [L41] COND FALSE !(j < edgecount) [L39] i++ [L39] COND FALSE !(i < nodecount) [L51] i = 0 [L51] COND TRUE i < edgecount [L53] EXPR Dest[i] [L53] x = Dest[i] [L54] EXPR Source[i] [L54] y = Source[i] [L55] EXPR distance[x] [L55] EXPR distance[y] [L55] EXPR Weight[i] [L55] COND FALSE !(distance[x] > distance[y] + Weight[i]) [L51] i++ [L51] COND FALSE !(i < edgecount) [L61] i = 0 [L61] COND TRUE i < nodecount [L63] EXPR distance[i] [L63] CALL __VERIFIER_assert(distance[i]>=0) [L11] COND FALSE !(!(cond)) [L63] RET __VERIFIER_assert(distance[i]>=0) [L61] i++ [L61] COND TRUE i < nodecount [L63] EXPR distance[i] [L63] CALL __VERIFIER_assert(distance[i]>=0) [L11] COND TRUE !(cond) [L12] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 44 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 18651.3ms, OverallIterations: 26, TraceHistogramMax: 4, EmptinessCheckTime: 45.6ms, AutomataDifference: 10185.2ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 9.9ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 1003 SDtfs, 2086 SDslu, 2981 SDs, 0 SdLazy, 6397 SolverSat, 921 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 4134.5ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 430 GetRequests, 92 SyntacticMatches, 7 SemanticMatches, 331 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1065 ImplicationChecksByTransitivity, 7127.1ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=687occurred in iteration=23, InterpolantAutomatonStates: 279, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 1219.8ms AutomataMinimizationTime, 25 MinimizatonAttempts, 2145 StatesRemovedByMinimization, 24 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...