/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_01-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 11:08:59,195 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 11:08:59,197 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 11:08:59,216 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 11:08:59,237 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 11:08:59,238 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 11:08:59,238 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 11:08:59,239 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-06 11:08:59,246 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 11:08:59,246 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 11:08:59,247 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 11:08:59,247 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 11:08:59,247 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 11:08:59,247 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 11:08:59,247 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 11:08:59,251 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 11:08:59,251 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 11:08:59,251 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 11:08:59,252 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 11:08:59,252 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 11:08:59,252 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 11:08:59,252 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 11:08:59,252 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 11:08:59,252 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 11:08:59,252 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 11:08:59,253 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 11:08:59,253 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:08:59,253 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 11:08:59,253 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 11:08:59,253 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 11:08:59,253 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 11:08:59,253 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 11:08:59,513 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 11:08:59,528 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 11:08:59,530 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 11:08:59,531 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 11:08:59,531 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 11:08:59,532 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/eureka_01-2.c [2021-05-06 11:08:59,580 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4acb29ac4/9c91df6ca622462497eb0f003475e723/FLAGb9beff8b2 [2021-05-06 11:08:59,900 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 11:08:59,901 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/eureka_01-2.c [2021-05-06 11:08:59,906 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4acb29ac4/9c91df6ca622462497eb0f003475e723/FLAGb9beff8b2 [2021-05-06 11:09:00,308 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4acb29ac4/9c91df6ca622462497eb0f003475e723 [2021-05-06 11:09:00,312 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 11:09:00,314 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 11:09:00,318 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 11:09:00,318 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 11:09:00,321 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 11:09:00,321 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:09:00" (1/1) ... [2021-05-06 11:09:00,323 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@556fbc8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:00, skipping insertion in model container [2021-05-06 11:09:00,323 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:09:00" (1/1) ... [2021-05-06 11:09:00,328 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 11:09:00,339 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 11:09:00,440 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_01-2.c[323,336] [2021-05-06 11:09:00,461 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:09:00,470 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 11:09:00,480 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_01-2.c[323,336] [2021-05-06 11:09:00,509 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:09:00,518 INFO L208 MainTranslator]: Completed translation [2021-05-06 11:09:00,518 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:00 WrapperNode [2021-05-06 11:09:00,519 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 11:09:00,519 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 11:09:00,519 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 11:09:00,519 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 11:09:00,581 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:00" (1/1) ... [2021-05-06 11:09:00,581 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:00" (1/1) ... [2021-05-06 11:09:00,587 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:00" (1/1) ... [2021-05-06 11:09:00,587 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:00" (1/1) ... [2021-05-06 11:09:00,595 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:00" (1/1) ... [2021-05-06 11:09:00,599 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:00" (1/1) ... [2021-05-06 11:09:00,600 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:00" (1/1) ... [2021-05-06 11:09:00,602 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 11:09:00,602 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 11:09:00,602 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 11:09:00,602 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 11:09:00,603 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:00" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:09:00,678 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 11:09:00,678 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 11:09:00,678 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 11:09:00,678 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 11:09:00,678 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 11:09:00,679 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 11:09:00,679 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 11:09:00,679 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 11:09:00,679 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 11:09:00,679 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 11:09:00,679 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 11:09:00,679 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 11:09:00,680 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 11:09:00,680 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 11:09:00,680 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 11:09:00,680 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 11:09:00,680 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 11:09:01,010 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 11:09:01,010 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2021-05-06 11:09:01,011 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:09:01 BoogieIcfgContainer [2021-05-06 11:09:01,011 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 11:09:01,012 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 11:09:01,012 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 11:09:01,015 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 11:09:01,016 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 11:09:00" (1/3) ... [2021-05-06 11:09:01,016 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a8e7d52 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:09:01, skipping insertion in model container [2021-05-06 11:09:01,016 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:09:00" (2/3) ... [2021-05-06 11:09:01,017 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a8e7d52 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:09:01, skipping insertion in model container [2021-05-06 11:09:01,017 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:09:01" (3/3) ... [2021-05-06 11:09:01,018 INFO L111 eAbstractionObserver]: Analyzing ICFG eureka_01-2.c [2021-05-06 11:09:01,022 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 11:09:01,025 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 11:09:01,035 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 11:09:01,052 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 11:09:01,052 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 11:09:01,052 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 11:09:01,052 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 11:09:01,052 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 11:09:01,052 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 11:09:01,052 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 11:09:01,052 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 11:09:01,061 INFO L276 IsEmpty]: Start isEmpty. Operand has 35 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 28 states have internal predecessors, (42), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:09:01,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 11:09:01,066 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:01,066 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:01,066 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:01,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:01,070 INFO L82 PathProgramCache]: Analyzing trace with hash -10776725, now seen corresponding path program 1 times [2021-05-06 11:09:01,075 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:01,075 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [631931031] [2021-05-06 11:09:01,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:01,130 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:01,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:01,265 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:01,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:01,296 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:01,297 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:01,298 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [631931031] [2021-05-06 11:09:01,299 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [631931031] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:01,299 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:01,299 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 11:09:01,299 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369138041] [2021-05-06 11:09:01,302 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 11:09:01,302 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:01,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 11:09:01,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:09:01,311 INFO L87 Difference]: Start difference. First operand has 35 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 28 states have internal predecessors, (42), 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 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:01,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:01,443 INFO L93 Difference]: Finished difference Result 61 states and 85 transitions. [2021-05-06 11:09:01,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 11:09:01,444 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-06 11:09:01,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:01,448 INFO L225 Difference]: With dead ends: 61 [2021-05-06 11:09:01,448 INFO L226 Difference]: Without dead ends: 30 [2021-05-06 11:09:01,450 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 37.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:09:01,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-06 11:09:01,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-06 11:09:01,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 24 states have internal predecessors, (31), 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) [2021-05-06 11:09:01,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2021-05-06 11:09:01,500 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 17 [2021-05-06 11:09:01,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:01,500 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2021-05-06 11:09:01,500 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:01,500 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2021-05-06 11:09:01,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 11:09:01,501 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:01,501 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:01,501 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 11:09:01,501 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:01,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:01,502 INFO L82 PathProgramCache]: Analyzing trace with hash -2004250474, now seen corresponding path program 1 times [2021-05-06 11:09:01,502 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:01,502 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2058189121] [2021-05-06 11:09:01,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:01,505 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:01,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:01,597 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:01,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:01,612 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:01,612 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:01,612 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2058189121] [2021-05-06 11:09:01,613 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2058189121] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:01,613 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:01,613 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 11:09:01,613 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [906590619] [2021-05-06 11:09:01,613 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 11:09:01,613 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:01,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 11:09:01,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 11:09:01,614 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:01,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:01,691 INFO L93 Difference]: Finished difference Result 54 states and 66 transitions. [2021-05-06 11:09:01,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 11:09:01,691 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-06 11:09:01,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:01,692 INFO L225 Difference]: With dead ends: 54 [2021-05-06 11:09:01,692 INFO L226 Difference]: Without dead ends: 33 [2021-05-06 11:09:01,693 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 23.4ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 11:09:01,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-06 11:09:01,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2021-05-06 11:09:01,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 25 states have (on average 1.28) internal successors, (32), 25 states have internal predecessors, (32), 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) [2021-05-06 11:09:01,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2021-05-06 11:09:01,698 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 17 [2021-05-06 11:09:01,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:01,698 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2021-05-06 11:09:01,699 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:01,699 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2021-05-06 11:09:01,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-06 11:09:01,699 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:01,699 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] [2021-05-06 11:09:01,699 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 11:09:01,699 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:01,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:01,700 INFO L82 PathProgramCache]: Analyzing trace with hash 1025073247, now seen corresponding path program 1 times [2021-05-06 11:09:01,700 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:01,700 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1394625081] [2021-05-06 11:09:01,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:01,717 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:01,718 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:01,721 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:01,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:01,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:01,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:01,828 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:01,829 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:01,829 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1394625081] [2021-05-06 11:09:01,829 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1394625081] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:01,829 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:01,829 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 11:09:01,830 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494371623] [2021-05-06 11:09:01,836 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 11:09:01,837 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:01,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 11:09:01,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:09:01,837 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:01,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:01,961 INFO L93 Difference]: Finished difference Result 61 states and 74 transitions. [2021-05-06 11:09:01,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 11:09:01,962 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-06 11:09:01,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:01,965 INFO L225 Difference]: With dead ends: 61 [2021-05-06 11:09:01,965 INFO L226 Difference]: Without dead ends: 46 [2021-05-06 11:09:01,966 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 48.6ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:09:01,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-06 11:09:01,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 32. [2021-05-06 11:09:01,979 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) [2021-05-06 11:09:01,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2021-05-06 11:09:01,983 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 20 [2021-05-06 11:09:01,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:01,983 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2021-05-06 11:09:01,983 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:01,984 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2021-05-06 11:09:01,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-06 11:09:01,984 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:01,984 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] [2021-05-06 11:09:01,984 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 11:09:01,984 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:01,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:01,985 INFO L82 PathProgramCache]: Analyzing trace with hash -315835948, now seen corresponding path program 1 times [2021-05-06 11:09:01,985 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:01,985 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1224606834] [2021-05-06 11:09:01,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:01,987 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:01,987 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:01,988 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:02,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:02,043 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:02,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:02,057 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:02,057 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:02,058 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1224606834] [2021-05-06 11:09:02,058 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1224606834] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:02,058 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:02,058 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 11:09:02,058 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [695675673] [2021-05-06 11:09:02,058 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 11:09:02,058 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:02,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 11:09:02,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:09:02,059 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:02,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:02,121 INFO L93 Difference]: Finished difference Result 55 states and 67 transitions. [2021-05-06 11:09:02,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 11:09:02,122 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-06 11:09:02,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:02,123 INFO L225 Difference]: With dead ends: 55 [2021-05-06 11:09:02,123 INFO L226 Difference]: Without dead ends: 35 [2021-05-06 11:09:02,123 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 22.4ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:09:02,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-06 11:09:02,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2021-05-06 11:09:02,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 27 states have (on average 1.2592592592592593) internal successors, (34), 27 states have internal predecessors, (34), 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) [2021-05-06 11:09:02,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2021-05-06 11:09:02,134 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 23 [2021-05-06 11:09:02,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:02,134 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2021-05-06 11:09:02,134 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:02,134 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2021-05-06 11:09:02,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-06 11:09:02,136 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:02,136 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] [2021-05-06 11:09:02,136 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 11:09:02,136 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:02,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:02,136 INFO L82 PathProgramCache]: Analyzing trace with hash -873463802, now seen corresponding path program 1 times [2021-05-06 11:09:02,136 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:02,136 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1977194984] [2021-05-06 11:09:02,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:02,139 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:02,140 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:02,141 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:02,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:02,230 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:02,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:02,245 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:02,245 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:02,246 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1977194984] [2021-05-06 11:09:02,246 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1977194984] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:02,246 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:02,246 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 11:09:02,246 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346011264] [2021-05-06 11:09:02,247 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 11:09:02,247 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:02,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 11:09:02,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:09:02,247 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:02,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:02,327 INFO L93 Difference]: Finished difference Result 58 states and 69 transitions. [2021-05-06 11:09:02,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 11:09:02,327 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-06 11:09:02,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:02,328 INFO L225 Difference]: With dead ends: 58 [2021-05-06 11:09:02,328 INFO L226 Difference]: Without dead ends: 47 [2021-05-06 11:09:02,329 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 23.0ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:09:02,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-06 11:09:02,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 34. [2021-05-06 11:09:02,335 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) [2021-05-06 11:09:02,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2021-05-06 11:09:02,336 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 26 [2021-05-06 11:09:02,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:02,337 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2021-05-06 11:09:02,337 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:02,337 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2021-05-06 11:09:02,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-06 11:09:02,337 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:02,337 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] [2021-05-06 11:09:02,337 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-06 11:09:02,338 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:02,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:02,338 INFO L82 PathProgramCache]: Analyzing trace with hash -1835268693, now seen corresponding path program 1 times [2021-05-06 11:09:02,338 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:02,340 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [492026786] [2021-05-06 11:09:02,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:02,344 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:02,344 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:02,345 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:02,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:02,429 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:02,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:02,437 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:02,437 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:02,437 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [492026786] [2021-05-06 11:09:02,437 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [492026786] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:02,437 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:02,438 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 11:09:02,438 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732743230] [2021-05-06 11:09:02,438 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 11:09:02,438 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:02,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 11:09:02,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:09:02,439 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 5 states, 5 states have (on average 5.0) internal successors, (25), 4 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:02,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:02,503 INFO L93 Difference]: Finished difference Result 63 states and 76 transitions. [2021-05-06 11:09:02,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 11:09:02,505 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 4 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-06 11:09:02,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:02,507 INFO L225 Difference]: With dead ends: 63 [2021-05-06 11:09:02,507 INFO L226 Difference]: Without dead ends: 39 [2021-05-06 11:09:02,507 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 23.5ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:09:02,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-06 11:09:02,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2021-05-06 11:09:02,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 31 states have internal predecessors, (39), 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) [2021-05-06 11:09:02,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions. [2021-05-06 11:09:02,515 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 29 [2021-05-06 11:09:02,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:02,515 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 44 transitions. [2021-05-06 11:09:02,515 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 4 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:02,516 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions. [2021-05-06 11:09:02,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-06 11:09:02,516 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:02,516 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] [2021-05-06 11:09:02,516 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-06 11:09:02,516 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:02,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:02,517 INFO L82 PathProgramCache]: Analyzing trace with hash 533557236, now seen corresponding path program 2 times [2021-05-06 11:09:02,517 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:02,517 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1287152943] [2021-05-06 11:09:02,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:02,521 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:02,521 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:02,522 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:02,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:02,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:02,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:02,610 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:02,610 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:02,610 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1287152943] [2021-05-06 11:09:02,610 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1287152943] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:02,610 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:02,610 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 11:09:02,612 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849013757] [2021-05-06 11:09:02,612 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 11:09:02,612 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:02,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 11:09:02,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:09:02,613 INFO L87 Difference]: Start difference. First operand 37 states and 44 transitions. Second operand has 5 states, 5 states have (on average 5.6) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:02,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:02,681 INFO L93 Difference]: Finished difference Result 68 states and 82 transitions. [2021-05-06 11:09:02,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 11:09:02,681 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-06 11:09:02,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:02,683 INFO L225 Difference]: With dead ends: 68 [2021-05-06 11:09:02,683 INFO L226 Difference]: Without dead ends: 39 [2021-05-06 11:09:02,683 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 28.7ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:09:02,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-06 11:09:02,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2021-05-06 11:09:02,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 32 states have (on average 1.21875) internal successors, (39), 32 states have internal predecessors, (39), 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) [2021-05-06 11:09:02,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 44 transitions. [2021-05-06 11:09:02,693 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 44 transitions. Word has length 32 [2021-05-06 11:09:02,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:02,694 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 44 transitions. [2021-05-06 11:09:02,694 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:02,694 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 44 transitions. [2021-05-06 11:09:02,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-06 11:09:02,696 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:02,696 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, 1, 1, 1, 1] [2021-05-06 11:09:02,696 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-06 11:09:02,697 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:02,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:02,697 INFO L82 PathProgramCache]: Analyzing trace with hash 752411954, now seen corresponding path program 1 times [2021-05-06 11:09:02,697 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:02,697 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [982245951] [2021-05-06 11:09:02,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:02,703 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:02,703 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:02,704 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:02,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:02,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:02,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:02,770 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:02,770 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:02,770 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [982245951] [2021-05-06 11:09:02,770 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [982245951] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:02,770 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:02,770 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 11:09:02,770 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144513172] [2021-05-06 11:09:02,770 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 11:09:02,771 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:02,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 11:09:02,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:09:02,771 INFO L87 Difference]: Start difference. First operand 38 states and 44 transitions. Second operand has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:02,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:02,833 INFO L93 Difference]: Finished difference Result 66 states and 78 transitions. [2021-05-06 11:09:02,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 11:09:02,833 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-06 11:09:02,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:02,835 INFO L225 Difference]: With dead ends: 66 [2021-05-06 11:09:02,835 INFO L226 Difference]: Without dead ends: 42 [2021-05-06 11:09:02,841 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 24.6ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:09:02,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-06 11:09:02,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2021-05-06 11:09:02,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 34 states have (on average 1.2058823529411764) internal successors, (41), 34 states have internal predecessors, (41), 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) [2021-05-06 11:09:02,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2021-05-06 11:09:02,852 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 32 [2021-05-06 11:09:02,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:02,852 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2021-05-06 11:09:02,852 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:02,853 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2021-05-06 11:09:02,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-06 11:09:02,858 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:02,858 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 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] [2021-05-06 11:09:02,858 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-06 11:09:02,859 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:02,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:02,860 INFO L82 PathProgramCache]: Analyzing trace with hash -240283891, now seen corresponding path program 2 times [2021-05-06 11:09:02,860 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:02,860 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [893087611] [2021-05-06 11:09:02,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:02,867 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:02,867 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:02,868 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:02,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:02,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:02,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:02,948 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:02,948 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:02,948 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [893087611] [2021-05-06 11:09:02,948 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [893087611] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:02,948 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:02,948 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 11:09:02,948 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251691534] [2021-05-06 11:09:02,949 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 11:09:02,949 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:02,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 11:09:02,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:09:02,949 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 6 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:03,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:03,061 INFO L93 Difference]: Finished difference Result 93 states and 113 transitions. [2021-05-06 11:09:03,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 11:09:03,062 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 6 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 35 [2021-05-06 11:09:03,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:03,062 INFO L225 Difference]: With dead ends: 93 [2021-05-06 11:09:03,062 INFO L226 Difference]: Without dead ends: 69 [2021-05-06 11:09:03,062 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 52.9ms TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:09:03,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-06 11:09:03,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 46. [2021-05-06 11:09:03,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 40 states have (on average 1.225) internal successors, (49), 40 states have internal predecessors, (49), 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) [2021-05-06 11:09:03,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2021-05-06 11:09:03,067 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 35 [2021-05-06 11:09:03,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:03,067 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2021-05-06 11:09:03,067 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 6 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:03,067 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2021-05-06 11:09:03,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-06 11:09:03,068 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:03,068 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 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] [2021-05-06 11:09:03,068 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-06 11:09:03,068 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:03,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:03,068 INFO L82 PathProgramCache]: Analyzing trace with hash -1283680124, now seen corresponding path program 3 times [2021-05-06 11:09:03,068 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:03,069 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [360451366] [2021-05-06 11:09:03,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:03,075 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:03,075 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:03,076 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:03,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:03,132 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:03,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:03,136 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:03,136 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:03,136 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [360451366] [2021-05-06 11:09:03,136 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [360451366] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:03,136 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:03,136 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 11:09:03,137 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462517006] [2021-05-06 11:09:03,137 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 11:09:03,137 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:03,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 11:09:03,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:09:03,137 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:03,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:03,217 INFO L93 Difference]: Finished difference Result 86 states and 103 transitions. [2021-05-06 11:09:03,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 11:09:03,217 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 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 41 [2021-05-06 11:09:03,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:03,218 INFO L225 Difference]: With dead ends: 86 [2021-05-06 11:09:03,218 INFO L226 Difference]: Without dead ends: 56 [2021-05-06 11:09:03,218 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 33.3ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:09:03,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-06 11:09:03,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 49. [2021-05-06 11:09:03,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 43 states have (on average 1.2325581395348837) internal successors, (53), 43 states have internal predecessors, (53), 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) [2021-05-06 11:09:03,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 58 transitions. [2021-05-06 11:09:03,222 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 58 transitions. Word has length 41 [2021-05-06 11:09:03,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:03,222 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 58 transitions. [2021-05-06 11:09:03,223 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:03,223 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 58 transitions. [2021-05-06 11:09:03,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-06 11:09:03,223 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:03,223 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 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] [2021-05-06 11:09:03,223 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-06 11:09:03,223 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:03,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:03,223 INFO L82 PathProgramCache]: Analyzing trace with hash -1817586423, now seen corresponding path program 4 times [2021-05-06 11:09:03,224 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:03,224 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [346653593] [2021-05-06 11:09:03,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:03,230 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:03,231 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:03,231 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:03,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:03,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:03,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:03,297 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:03,297 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:03,298 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [346653593] [2021-05-06 11:09:03,298 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [346653593] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:03,298 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:03,298 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 11:09:03,298 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220572767] [2021-05-06 11:09:03,298 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 11:09:03,298 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:03,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 11:09:03,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:09:03,298 INFO L87 Difference]: Start difference. First operand 49 states and 58 transitions. Second operand has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:03,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:03,421 INFO L93 Difference]: Finished difference Result 119 states and 147 transitions. [2021-05-06 11:09:03,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 11:09:03,421 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 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 44 [2021-05-06 11:09:03,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:03,422 INFO L225 Difference]: With dead ends: 119 [2021-05-06 11:09:03,422 INFO L226 Difference]: Without dead ends: 89 [2021-05-06 11:09:03,423 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 58.0ms TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:09:03,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-06 11:09:03,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 55. [2021-05-06 11:09:03,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 49 states have (on average 1.2448979591836735) internal successors, (61), 49 states have internal predecessors, (61), 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) [2021-05-06 11:09:03,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions. [2021-05-06 11:09:03,428 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 44 [2021-05-06 11:09:03,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:03,428 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 66 transitions. [2021-05-06 11:09:03,428 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:03,428 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions. [2021-05-06 11:09:03,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-06 11:09:03,429 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:03,429 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 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] [2021-05-06 11:09:03,429 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-05-06 11:09:03,429 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:03,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:03,429 INFO L82 PathProgramCache]: Analyzing trace with hash 1321273796, now seen corresponding path program 5 times [2021-05-06 11:09:03,429 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:03,429 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1349844433] [2021-05-06 11:09:03,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:03,435 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:03,435 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:03,436 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:03,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:03,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:03,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:03,497 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:03,497 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:03,497 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1349844433] [2021-05-06 11:09:03,497 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1349844433] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:03,497 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:03,497 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 11:09:03,497 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282934603] [2021-05-06 11:09:03,497 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 11:09:03,498 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:03,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 11:09:03,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:09:03,498 INFO L87 Difference]: Start difference. First operand 55 states and 66 transitions. Second operand has 8 states, 8 states have (on average 4.25) internal successors, (34), 7 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:03,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:03,594 INFO L93 Difference]: Finished difference Result 106 states and 129 transitions. [2021-05-06 11:09:03,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:09:03,594 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.25) internal successors, (34), 7 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-06 11:09:03,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:03,595 INFO L225 Difference]: With dead ends: 106 [2021-05-06 11:09:03,595 INFO L226 Difference]: Without dead ends: 70 [2021-05-06 11:09:03,595 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 34.4ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:09:03,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-05-06 11:09:03,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 58. [2021-05-06 11:09:03,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 52 states have (on average 1.25) internal successors, (65), 52 states have internal predecessors, (65), 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) [2021-05-06 11:09:03,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 70 transitions. [2021-05-06 11:09:03,601 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 70 transitions. Word has length 50 [2021-05-06 11:09:03,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:03,601 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 70 transitions. [2021-05-06 11:09:03,601 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.25) internal successors, (34), 7 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:03,601 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 70 transitions. [2021-05-06 11:09:03,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-06 11:09:03,601 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:03,601 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 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] [2021-05-06 11:09:03,602 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-06 11:09:03,602 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:03,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:03,602 INFO L82 PathProgramCache]: Analyzing trace with hash 1910444767, now seen corresponding path program 6 times [2021-05-06 11:09:03,602 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:03,602 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1576984931] [2021-05-06 11:09:03,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:03,611 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:03,611 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:03,612 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:03,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:03,704 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:03,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:03,707 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:03,709 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:03,709 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1576984931] [2021-05-06 11:09:03,709 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1576984931] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:03,709 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:03,709 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:09:03,709 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828349013] [2021-05-06 11:09:03,710 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:09:03,710 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:03,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:09:03,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:09:03,710 INFO L87 Difference]: Start difference. First operand 58 states and 70 transitions. Second operand has 9 states, 9 states have (on average 4.0) internal successors, (36), 8 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) [2021-05-06 11:09:03,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:03,877 INFO L93 Difference]: Finished difference Result 145 states and 181 transitions. [2021-05-06 11:09:03,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:09:03,878 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.0) internal successors, (36), 8 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 53 [2021-05-06 11:09:03,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:03,878 INFO L225 Difference]: With dead ends: 145 [2021-05-06 11:09:03,878 INFO L226 Difference]: Without dead ends: 109 [2021-05-06 11:09:03,879 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 76.1ms TimeCoverageRelationStatistics Valid=55, Invalid=101, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:09:03,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-06 11:09:03,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 64. [2021-05-06 11:09:03,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 58 states have (on average 1.2586206896551724) internal successors, (73), 58 states have internal predecessors, (73), 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) [2021-05-06 11:09:03,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 78 transitions. [2021-05-06 11:09:03,885 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 78 transitions. Word has length 53 [2021-05-06 11:09:03,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:03,885 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 78 transitions. [2021-05-06 11:09:03,885 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.0) internal successors, (36), 8 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) [2021-05-06 11:09:03,885 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 78 transitions. [2021-05-06 11:09:03,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-06 11:09:03,886 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:03,886 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:03,886 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-05-06 11:09:03,886 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:03,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:03,886 INFO L82 PathProgramCache]: Analyzing trace with hash 1365869398, now seen corresponding path program 7 times [2021-05-06 11:09:03,886 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:03,886 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1088226355] [2021-05-06 11:09:03,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:03,895 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:03,895 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:03,896 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:03,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:03,954 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:03,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:03,958 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:03,958 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:03,958 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1088226355] [2021-05-06 11:09:03,959 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1088226355] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:03,959 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:03,959 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 11:09:03,959 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127503540] [2021-05-06 11:09:03,959 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 11:09:03,959 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:03,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 11:09:03,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:09:03,959 INFO L87 Difference]: Start difference. First operand 64 states and 78 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) [2021-05-06 11:09:04,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:04,036 INFO L93 Difference]: Finished difference Result 120 states and 154 transitions. [2021-05-06 11:09:04,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 11:09:04,037 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 59 [2021-05-06 11:09:04,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:04,037 INFO L225 Difference]: With dead ends: 120 [2021-05-06 11:09:04,037 INFO L226 Difference]: Without dead ends: 84 [2021-05-06 11:09:04,038 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 25.3ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:09:04,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-06 11:09:04,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 76. [2021-05-06 11:09:04,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 70 states have (on average 1.2714285714285714) internal successors, (89), 70 states have internal predecessors, (89), 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) [2021-05-06 11:09:04,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 94 transitions. [2021-05-06 11:09:04,045 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 94 transitions. Word has length 59 [2021-05-06 11:09:04,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:04,045 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 94 transitions. [2021-05-06 11:09:04,045 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) [2021-05-06 11:09:04,045 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 94 transitions. [2021-05-06 11:09:04,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-06 11:09:04,045 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:04,045 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 8, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:04,046 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-06 11:09:04,046 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:04,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:04,046 INFO L82 PathProgramCache]: Analyzing trace with hash 2115991730, now seen corresponding path program 8 times [2021-05-06 11:09:04,046 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:04,046 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1397263082] [2021-05-06 11:09:04,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:04,052 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:04,052 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:04,053 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:04,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:04,138 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:04,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:04,143 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:04,143 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:04,143 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1397263082] [2021-05-06 11:09:04,143 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1397263082] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:04,143 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:04,143 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 11:09:04,143 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155717541] [2021-05-06 11:09:04,143 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 11:09:04,143 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:04,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 11:09:04,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:09:04,144 INFO L87 Difference]: Start difference. First operand 76 states and 94 transitions. Second operand has 7 states, 7 states have (on average 4.857142857142857) internal successors, (34), 6 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:04,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:04,208 INFO L93 Difference]: Finished difference Result 141 states and 182 transitions. [2021-05-06 11:09:04,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 11:09:04,208 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.857142857142857) internal successors, (34), 6 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 71 [2021-05-06 11:09:04,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:04,210 INFO L225 Difference]: With dead ends: 141 [2021-05-06 11:09:04,210 INFO L226 Difference]: Without dead ends: 96 [2021-05-06 11:09:04,213 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 29.7ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:09:04,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-06 11:09:04,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 88. [2021-05-06 11:09:04,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 82 states have (on average 1.2804878048780488) internal successors, (105), 82 states have internal predecessors, (105), 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) [2021-05-06 11:09:04,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 110 transitions. [2021-05-06 11:09:04,220 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 110 transitions. Word has length 71 [2021-05-06 11:09:04,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:04,220 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 110 transitions. [2021-05-06 11:09:04,220 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.857142857142857) internal successors, (34), 6 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:04,220 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 110 transitions. [2021-05-06 11:09:04,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-06 11:09:04,221 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:04,221 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 12, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:04,221 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-06 11:09:04,221 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:04,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:04,221 INFO L82 PathProgramCache]: Analyzing trace with hash -1359309354, now seen corresponding path program 9 times [2021-05-06 11:09:04,221 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:04,221 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1585169371] [2021-05-06 11:09:04,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:04,229 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:04,229 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:04,230 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:04,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:04,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:04,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:04,327 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:04,327 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:04,327 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1585169371] [2021-05-06 11:09:04,327 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1585169371] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:04,327 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:04,327 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 11:09:04,327 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1928149443] [2021-05-06 11:09:04,327 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 11:09:04,327 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:04,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 11:09:04,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:09:04,328 INFO L87 Difference]: Start difference. First operand 88 states and 110 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) [2021-05-06 11:09:04,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:04,393 INFO L93 Difference]: Finished difference Result 162 states and 210 transitions. [2021-05-06 11:09:04,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:09:04,393 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 83 [2021-05-06 11:09:04,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:04,394 INFO L225 Difference]: With dead ends: 162 [2021-05-06 11:09:04,394 INFO L226 Difference]: Without dead ends: 108 [2021-05-06 11:09:04,394 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 35.3ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:09:04,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-06 11:09:04,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 100. [2021-05-06 11:09:04,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 94 states have (on average 1.2872340425531914) internal successors, (121), 94 states have internal predecessors, (121), 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) [2021-05-06 11:09:04,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 126 transitions. [2021-05-06 11:09:04,403 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 126 transitions. Word has length 83 [2021-05-06 11:09:04,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:04,403 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 126 transitions. [2021-05-06 11:09:04,403 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) [2021-05-06 11:09:04,403 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 126 transitions. [2021-05-06 11:09:04,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-06 11:09:04,404 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:04,404 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 16, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:04,404 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-05-06 11:09:04,404 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:04,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:04,404 INFO L82 PathProgramCache]: Analyzing trace with hash 346337586, now seen corresponding path program 10 times [2021-05-06 11:09:04,404 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:04,404 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [901440212] [2021-05-06 11:09:04,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:04,410 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:04,410 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:04,411 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:04,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:04,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:04,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:04,509 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:04,509 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:04,509 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [901440212] [2021-05-06 11:09:04,509 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [901440212] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:04,509 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:04,509 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:09:04,509 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729531792] [2021-05-06 11:09:04,509 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:09:04,509 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:04,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:09:04,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:09:04,510 INFO L87 Difference]: Start difference. First operand 100 states and 126 transitions. Second operand has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 8 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:04,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:04,585 INFO L93 Difference]: Finished difference Result 183 states and 238 transitions. [2021-05-06 11:09:04,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:09:04,585 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 8 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 95 [2021-05-06 11:09:04,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:04,586 INFO L225 Difference]: With dead ends: 183 [2021-05-06 11:09:04,586 INFO L226 Difference]: Without dead ends: 120 [2021-05-06 11:09:04,587 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 37.9ms TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:09:04,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-05-06 11:09:04,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 112. [2021-05-06 11:09:04,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 106 states have (on average 1.2924528301886793) internal successors, (137), 106 states have internal predecessors, (137), 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) [2021-05-06 11:09:04,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 142 transitions. [2021-05-06 11:09:04,596 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 142 transitions. Word has length 95 [2021-05-06 11:09:04,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:04,597 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 142 transitions. [2021-05-06 11:09:04,597 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 8 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:04,597 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 142 transitions. [2021-05-06 11:09:04,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-06 11:09:04,597 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:04,598 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 20, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:04,598 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-05-06 11:09:04,598 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:04,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:04,598 INFO L82 PathProgramCache]: Analyzing trace with hash -8943530, now seen corresponding path program 11 times [2021-05-06 11:09:04,598 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:04,598 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2139192108] [2021-05-06 11:09:04,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:04,604 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:04,604 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:04,605 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:04,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:04,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:04,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:04,719 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:04,719 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:04,719 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2139192108] [2021-05-06 11:09:04,719 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2139192108] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:04,719 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:04,720 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:09:04,720 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827485359] [2021-05-06 11:09:04,720 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:09:04,720 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:04,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:09:04,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:09:04,720 INFO L87 Difference]: Start difference. First operand 112 states and 142 transitions. Second operand has 10 states, 10 states have (on average 4.3) internal successors, (43), 9 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:04,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:04,804 INFO L93 Difference]: Finished difference Result 204 states and 266 transitions. [2021-05-06 11:09:04,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 11:09:04,804 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.3) internal successors, (43), 9 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 107 [2021-05-06 11:09:04,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:04,805 INFO L225 Difference]: With dead ends: 204 [2021-05-06 11:09:04,805 INFO L226 Difference]: Without dead ends: 132 [2021-05-06 11:09:04,805 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 49.0ms TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:09:04,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-05-06 11:09:04,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 124. [2021-05-06 11:09:04,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 118 states have (on average 1.2966101694915255) internal successors, (153), 118 states have internal predecessors, (153), 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) [2021-05-06 11:09:04,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 158 transitions. [2021-05-06 11:09:04,826 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 158 transitions. Word has length 107 [2021-05-06 11:09:04,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:04,826 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 158 transitions. [2021-05-06 11:09:04,826 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 4.3) internal successors, (43), 9 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:04,826 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 158 transitions. [2021-05-06 11:09:04,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-05-06 11:09:04,826 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:04,827 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 24, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:04,827 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-06 11:09:04,827 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:04,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:04,827 INFO L82 PathProgramCache]: Analyzing trace with hash -1834710606, now seen corresponding path program 12 times [2021-05-06 11:09:04,827 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:04,827 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1339078632] [2021-05-06 11:09:04,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:04,833 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:04,833 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:04,834 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:04,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:04,968 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:04,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:04,973 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:04,973 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:04,973 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1339078632] [2021-05-06 11:09:04,973 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1339078632] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:04,973 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:04,973 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:09:04,973 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137837353] [2021-05-06 11:09:04,973 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:09:04,973 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:04,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:09:04,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:09:04,974 INFO L87 Difference]: Start difference. First operand 124 states and 158 transitions. Second operand has 11 states, 11 states have (on average 4.181818181818182) internal successors, (46), 10 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:05,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:05,064 INFO L93 Difference]: Finished difference Result 225 states and 294 transitions. [2021-05-06 11:09:05,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:09:05,065 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.181818181818182) internal successors, (46), 10 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 119 [2021-05-06 11:09:05,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:05,065 INFO L225 Difference]: With dead ends: 225 [2021-05-06 11:09:05,065 INFO L226 Difference]: Without dead ends: 144 [2021-05-06 11:09:05,066 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 60.8ms TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:09:05,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-05-06 11:09:05,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 136. [2021-05-06 11:09:05,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 130 states have (on average 1.3) internal successors, (169), 130 states have internal predecessors, (169), 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) [2021-05-06 11:09:05,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 174 transitions. [2021-05-06 11:09:05,076 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 174 transitions. Word has length 119 [2021-05-06 11:09:05,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:05,077 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 174 transitions. [2021-05-06 11:09:05,077 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 4.181818181818182) internal successors, (46), 10 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:05,077 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 174 transitions. [2021-05-06 11:09:05,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-06 11:09:05,077 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:05,077 INFO L523 BasicCegarLoop]: trace histogram [28, 28, 28, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:05,077 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-05-06 11:09:05,078 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:05,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:05,078 INFO L82 PathProgramCache]: Analyzing trace with hash 1613781718, now seen corresponding path program 13 times [2021-05-06 11:09:05,078 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:05,078 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [34635244] [2021-05-06 11:09:05,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:05,083 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:05,083 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:05,084 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:05,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:05,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:05,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:05,210 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:05,210 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:05,210 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [34635244] [2021-05-06 11:09:05,210 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [34635244] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:05,210 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:05,210 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 11:09:05,210 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107997619] [2021-05-06 11:09:05,210 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 11:09:05,210 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:05,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 11:09:05,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:09:05,211 INFO L87 Difference]: Start difference. First operand 136 states and 174 transitions. Second operand has 12 states, 12 states have (on average 4.083333333333333) internal successors, (49), 11 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:05,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:05,324 INFO L93 Difference]: Finished difference Result 246 states and 322 transitions. [2021-05-06 11:09:05,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 11:09:05,325 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.083333333333333) internal successors, (49), 11 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 131 [2021-05-06 11:09:05,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:05,325 INFO L225 Difference]: With dead ends: 246 [2021-05-06 11:09:05,325 INFO L226 Difference]: Without dead ends: 156 [2021-05-06 11:09:05,325 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 65.2ms TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:09:05,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-05-06 11:09:05,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 148. [2021-05-06 11:09:05,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 142 states have (on average 1.3028169014084507) internal successors, (185), 142 states have internal predecessors, (185), 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) [2021-05-06 11:09:05,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 190 transitions. [2021-05-06 11:09:05,338 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 190 transitions. Word has length 131 [2021-05-06 11:09:05,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:05,338 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 190 transitions. [2021-05-06 11:09:05,338 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 4.083333333333333) internal successors, (49), 11 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:05,338 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 190 transitions. [2021-05-06 11:09:05,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-05-06 11:09:05,339 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:05,339 INFO L523 BasicCegarLoop]: trace histogram [32, 32, 32, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:05,339 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-05-06 11:09:05,339 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:05,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:05,339 INFO L82 PathProgramCache]: Analyzing trace with hash -2096168398, now seen corresponding path program 14 times [2021-05-06 11:09:05,340 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:05,340 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1739983093] [2021-05-06 11:09:05,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:05,346 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:05,347 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:05,348 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:05,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:05,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:05,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:05,505 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:05,505 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:05,505 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1739983093] [2021-05-06 11:09:05,505 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1739983093] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:05,505 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:05,505 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:09:05,506 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508641211] [2021-05-06 11:09:05,506 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:09:05,506 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:05,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:09:05,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:09:05,506 INFO L87 Difference]: Start difference. First operand 148 states and 190 transitions. Second operand has 13 states, 13 states have (on average 4.0) internal successors, (52), 12 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:05,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:05,600 INFO L93 Difference]: Finished difference Result 267 states and 350 transitions. [2021-05-06 11:09:05,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:09:05,600 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 4.0) internal successors, (52), 12 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 143 [2021-05-06 11:09:05,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:05,601 INFO L225 Difference]: With dead ends: 267 [2021-05-06 11:09:05,601 INFO L226 Difference]: Without dead ends: 168 [2021-05-06 11:09:05,601 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 76.4ms TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:09:05,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-05-06 11:09:05,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 160. [2021-05-06 11:09:05,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 154 states have (on average 1.3051948051948052) internal successors, (201), 154 states have internal predecessors, (201), 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) [2021-05-06 11:09:05,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 206 transitions. [2021-05-06 11:09:05,615 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 206 transitions. Word has length 143 [2021-05-06 11:09:05,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:05,615 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 206 transitions. [2021-05-06 11:09:05,615 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 4.0) internal successors, (52), 12 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:05,615 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 206 transitions. [2021-05-06 11:09:05,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-05-06 11:09:05,616 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:05,616 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 36, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:05,616 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-05-06 11:09:05,616 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:05,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:05,616 INFO L82 PathProgramCache]: Analyzing trace with hash -529199786, now seen corresponding path program 15 times [2021-05-06 11:09:05,616 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:05,617 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [35629988] [2021-05-06 11:09:05,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:05,623 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:05,623 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:05,624 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:05,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:05,808 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:05,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:05,811 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:05,811 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:05,811 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [35629988] [2021-05-06 11:09:05,811 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [35629988] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:05,811 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:05,811 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:09:05,811 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1378332242] [2021-05-06 11:09:05,811 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:09:05,811 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:05,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:09:05,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:09:05,812 INFO L87 Difference]: Start difference. First operand 160 states and 206 transitions. Second operand has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 13 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:05,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:05,919 INFO L93 Difference]: Finished difference Result 288 states and 378 transitions. [2021-05-06 11:09:05,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 11:09:05,919 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 13 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 155 [2021-05-06 11:09:05,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:05,920 INFO L225 Difference]: With dead ends: 288 [2021-05-06 11:09:05,920 INFO L226 Difference]: Without dead ends: 180 [2021-05-06 11:09:05,921 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 84.3ms TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:09:05,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-05-06 11:09:05,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 172. [2021-05-06 11:09:05,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 166 states have (on average 1.3072289156626506) internal successors, (217), 166 states have internal predecessors, (217), 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) [2021-05-06 11:09:05,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 222 transitions. [2021-05-06 11:09:05,937 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 222 transitions. Word has length 155 [2021-05-06 11:09:05,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:05,937 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 222 transitions. [2021-05-06 11:09:05,937 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 13 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:05,937 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 222 transitions. [2021-05-06 11:09:05,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-05-06 11:09:05,938 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:05,938 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 40, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:05,938 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-05-06 11:09:05,938 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:05,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:05,938 INFO L82 PathProgramCache]: Analyzing trace with hash 517216946, now seen corresponding path program 16 times [2021-05-06 11:09:05,938 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:05,938 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1003194280] [2021-05-06 11:09:05,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:05,944 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:05,944 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:05,944 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:05,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:06,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:06,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:06,140 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:06,140 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:06,140 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1003194280] [2021-05-06 11:09:06,141 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1003194280] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:06,141 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:06,141 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:09:06,141 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122251702] [2021-05-06 11:09:06,141 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:09:06,141 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:06,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:09:06,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:09:06,141 INFO L87 Difference]: Start difference. First operand 172 states and 222 transitions. Second operand has 15 states, 15 states have (on average 3.8666666666666667) internal successors, (58), 14 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:06,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:06,251 INFO L93 Difference]: Finished difference Result 309 states and 406 transitions. [2021-05-06 11:09:06,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:09:06,251 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.8666666666666667) internal successors, (58), 14 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 167 [2021-05-06 11:09:06,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:06,252 INFO L225 Difference]: With dead ends: 309 [2021-05-06 11:09:06,252 INFO L226 Difference]: Without dead ends: 192 [2021-05-06 11:09:06,252 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 96.3ms TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:09:06,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2021-05-06 11:09:06,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 184. [2021-05-06 11:09:06,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 178 states have (on average 1.3089887640449438) internal successors, (233), 178 states have internal predecessors, (233), 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) [2021-05-06 11:09:06,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 238 transitions. [2021-05-06 11:09:06,267 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 238 transitions. Word has length 167 [2021-05-06 11:09:06,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:06,267 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 238 transitions. [2021-05-06 11:09:06,267 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 3.8666666666666667) internal successors, (58), 14 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:06,267 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 238 transitions. [2021-05-06 11:09:06,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2021-05-06 11:09:06,268 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:06,268 INFO L523 BasicCegarLoop]: trace histogram [44, 44, 44, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:06,268 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-05-06 11:09:06,268 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:06,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:06,269 INFO L82 PathProgramCache]: Analyzing trace with hash -2120900650, now seen corresponding path program 17 times [2021-05-06 11:09:06,269 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:06,269 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1012571659] [2021-05-06 11:09:06,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:06,274 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:06,275 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:06,275 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:06,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:06,474 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:06,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:06,477 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:06,477 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:06,477 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1012571659] [2021-05-06 11:09:06,477 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1012571659] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:06,477 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:06,477 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:09:06,477 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886083411] [2021-05-06 11:09:06,478 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:09:06,478 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:06,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:09:06,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:09:06,478 INFO L87 Difference]: Start difference. First operand 184 states and 238 transitions. Second operand has 16 states, 16 states have (on average 3.8125) internal successors, (61), 15 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:06,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:06,639 INFO L93 Difference]: Finished difference Result 330 states and 434 transitions. [2021-05-06 11:09:06,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 11:09:06,639 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.8125) internal successors, (61), 15 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 179 [2021-05-06 11:09:06,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:06,640 INFO L225 Difference]: With dead ends: 330 [2021-05-06 11:09:06,640 INFO L226 Difference]: Without dead ends: 204 [2021-05-06 11:09:06,641 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 105.7ms TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:09:06,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2021-05-06 11:09:06,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 196. [2021-05-06 11:09:06,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 190 states have (on average 1.3105263157894738) internal successors, (249), 190 states have internal predecessors, (249), 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) [2021-05-06 11:09:06,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 254 transitions. [2021-05-06 11:09:06,662 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 254 transitions. Word has length 179 [2021-05-06 11:09:06,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:06,662 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 254 transitions. [2021-05-06 11:09:06,662 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.8125) internal successors, (61), 15 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:06,662 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 254 transitions. [2021-05-06 11:09:06,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-05-06 11:09:06,663 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:06,664 INFO L523 BasicCegarLoop]: trace histogram [48, 48, 48, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:06,664 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-05-06 11:09:06,664 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:06,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:06,664 INFO L82 PathProgramCache]: Analyzing trace with hash 1289999154, now seen corresponding path program 18 times [2021-05-06 11:09:06,664 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:06,664 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [607206840] [2021-05-06 11:09:06,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:06,670 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:06,670 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:06,671 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:06,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:06,880 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:06,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:06,883 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:06,883 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:06,883 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [607206840] [2021-05-06 11:09:06,883 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [607206840] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:06,883 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:06,883 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:09:06,883 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [172396772] [2021-05-06 11:09:06,884 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:09:06,884 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:06,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:09:06,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:09:06,885 INFO L87 Difference]: Start difference. First operand 196 states and 254 transitions. Second operand has 17 states, 17 states have (on average 3.764705882352941) internal successors, (64), 16 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:07,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:07,005 INFO L93 Difference]: Finished difference Result 351 states and 462 transitions. [2021-05-06 11:09:07,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 11:09:07,006 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.764705882352941) internal successors, (64), 16 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 191 [2021-05-06 11:09:07,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:07,007 INFO L225 Difference]: With dead ends: 351 [2021-05-06 11:09:07,007 INFO L226 Difference]: Without dead ends: 216 [2021-05-06 11:09:07,007 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 114.9ms TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:09:07,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2021-05-06 11:09:07,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 208. [2021-05-06 11:09:07,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 202 states have (on average 1.311881188118812) internal successors, (265), 202 states have internal predecessors, (265), 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) [2021-05-06 11:09:07,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 270 transitions. [2021-05-06 11:09:07,027 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 270 transitions. Word has length 191 [2021-05-06 11:09:07,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:07,028 INFO L480 AbstractCegarLoop]: Abstraction has 208 states and 270 transitions. [2021-05-06 11:09:07,028 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 3.764705882352941) internal successors, (64), 16 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:07,028 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 270 transitions. [2021-05-06 11:09:07,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2021-05-06 11:09:07,029 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:07,029 INFO L523 BasicCegarLoop]: trace histogram [52, 52, 52, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:07,029 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-05-06 11:09:07,029 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:07,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:07,030 INFO L82 PathProgramCache]: Analyzing trace with hash 920785494, now seen corresponding path program 19 times [2021-05-06 11:09:07,030 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:07,030 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2007210873] [2021-05-06 11:09:07,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:07,035 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:07,035 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:07,036 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:07,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:07,267 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:07,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:07,270 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:07,270 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:07,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2007210873] [2021-05-06 11:09:07,270 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2007210873] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:07,270 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:07,270 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:09:07,271 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258576871] [2021-05-06 11:09:07,271 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:09:07,271 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:07,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:09:07,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:09:07,271 INFO L87 Difference]: Start difference. First operand 208 states and 270 transitions. Second operand has 18 states, 18 states have (on average 3.7222222222222223) internal successors, (67), 17 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:07,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:07,396 INFO L93 Difference]: Finished difference Result 372 states and 490 transitions. [2021-05-06 11:09:07,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 11:09:07,397 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.7222222222222223) internal successors, (67), 17 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 203 [2021-05-06 11:09:07,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:07,397 INFO L225 Difference]: With dead ends: 372 [2021-05-06 11:09:07,397 INFO L226 Difference]: Without dead ends: 228 [2021-05-06 11:09:07,398 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 124.7ms TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:09:07,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2021-05-06 11:09:07,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 220. [2021-05-06 11:09:07,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 214 states have (on average 1.3130841121495327) internal successors, (281), 214 states have internal predecessors, (281), 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) [2021-05-06 11:09:07,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 286 transitions. [2021-05-06 11:09:07,417 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 286 transitions. Word has length 203 [2021-05-06 11:09:07,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:07,417 INFO L480 AbstractCegarLoop]: Abstraction has 220 states and 286 transitions. [2021-05-06 11:09:07,417 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 3.7222222222222223) internal successors, (67), 17 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:07,417 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 286 transitions. [2021-05-06 11:09:07,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2021-05-06 11:09:07,418 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:07,418 INFO L523 BasicCegarLoop]: trace histogram [56, 56, 56, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:07,418 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-05-06 11:09:07,418 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:07,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:07,418 INFO L82 PathProgramCache]: Analyzing trace with hash -1574032462, now seen corresponding path program 20 times [2021-05-06 11:09:07,419 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:07,419 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [368405543] [2021-05-06 11:09:07,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:07,424 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:07,424 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:07,425 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:07,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:07,690 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:07,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:07,693 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:07,693 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:07,693 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [368405543] [2021-05-06 11:09:07,693 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [368405543] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:07,693 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:07,693 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 11:09:07,693 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334172047] [2021-05-06 11:09:07,693 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 11:09:07,693 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:07,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 11:09:07,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:09:07,694 INFO L87 Difference]: Start difference. First operand 220 states and 286 transitions. Second operand has 19 states, 19 states have (on average 3.6842105263157894) internal successors, (70), 18 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:07,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:07,815 INFO L93 Difference]: Finished difference Result 393 states and 518 transitions. [2021-05-06 11:09:07,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 11:09:07,815 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.6842105263157894) internal successors, (70), 18 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 215 [2021-05-06 11:09:07,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:07,816 INFO L225 Difference]: With dead ends: 393 [2021-05-06 11:09:07,816 INFO L226 Difference]: Without dead ends: 240 [2021-05-06 11:09:07,817 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 156.7ms TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:09:07,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2021-05-06 11:09:07,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 232. [2021-05-06 11:09:07,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 226 states have (on average 1.3141592920353982) internal successors, (297), 226 states have internal predecessors, (297), 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) [2021-05-06 11:09:07,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 302 transitions. [2021-05-06 11:09:07,835 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 302 transitions. Word has length 215 [2021-05-06 11:09:07,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:07,835 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 302 transitions. [2021-05-06 11:09:07,835 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.6842105263157894) internal successors, (70), 18 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:07,835 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 302 transitions. [2021-05-06 11:09:07,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2021-05-06 11:09:07,836 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:07,837 INFO L523 BasicCegarLoop]: trace histogram [60, 60, 60, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:07,837 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-05-06 11:09:07,837 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:07,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:07,837 INFO L82 PathProgramCache]: Analyzing trace with hash -441817898, now seen corresponding path program 21 times [2021-05-06 11:09:07,837 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:07,837 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1818661720] [2021-05-06 11:09:07,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:07,843 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:07,843 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:07,844 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:07,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:08,112 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:08,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:08,115 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:08,115 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:08,115 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1818661720] [2021-05-06 11:09:08,115 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1818661720] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:08,115 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:08,115 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 11:09:08,115 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [986917644] [2021-05-06 11:09:08,116 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 11:09:08,116 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:08,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 11:09:08,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:09:08,117 INFO L87 Difference]: Start difference. First operand 232 states and 302 transitions. Second operand has 20 states, 20 states have (on average 3.65) internal successors, (73), 19 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:08,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:08,252 INFO L93 Difference]: Finished difference Result 414 states and 546 transitions. [2021-05-06 11:09:08,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 11:09:08,253 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.65) internal successors, (73), 19 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 227 [2021-05-06 11:09:08,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:08,254 INFO L225 Difference]: With dead ends: 414 [2021-05-06 11:09:08,254 INFO L226 Difference]: Without dead ends: 252 [2021-05-06 11:09:08,254 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 168.5ms TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:09:08,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2021-05-06 11:09:08,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 244. [2021-05-06 11:09:08,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 238 states have (on average 1.315126050420168) internal successors, (313), 238 states have internal predecessors, (313), 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) [2021-05-06 11:09:08,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 318 transitions. [2021-05-06 11:09:08,274 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 318 transitions. Word has length 227 [2021-05-06 11:09:08,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:08,274 INFO L480 AbstractCegarLoop]: Abstraction has 244 states and 318 transitions. [2021-05-06 11:09:08,274 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 3.65) internal successors, (73), 19 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:08,274 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 318 transitions. [2021-05-06 11:09:08,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 240 [2021-05-06 11:09:08,275 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:08,276 INFO L523 BasicCegarLoop]: trace histogram [64, 64, 64, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:08,276 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-05-06 11:09:08,276 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:08,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:08,276 INFO L82 PathProgramCache]: Analyzing trace with hash 1638081586, now seen corresponding path program 22 times [2021-05-06 11:09:08,276 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:08,276 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1122713573] [2021-05-06 11:09:08,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:08,283 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:08,283 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:08,283 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:08,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:08,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:08,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:08,593 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:08,593 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:08,593 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1122713573] [2021-05-06 11:09:08,593 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1122713573] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:08,593 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:08,594 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:09:08,594 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [784427617] [2021-05-06 11:09:08,594 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:09:08,594 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:08,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:09:08,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:09:08,594 INFO L87 Difference]: Start difference. First operand 244 states and 318 transitions. Second operand has 21 states, 21 states have (on average 3.619047619047619) internal successors, (76), 20 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:08,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:08,753 INFO L93 Difference]: Finished difference Result 435 states and 574 transitions. [2021-05-06 11:09:08,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:09:08,753 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.619047619047619) internal successors, (76), 20 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 239 [2021-05-06 11:09:08,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:08,754 INFO L225 Difference]: With dead ends: 435 [2021-05-06 11:09:08,755 INFO L226 Difference]: Without dead ends: 264 [2021-05-06 11:09:08,756 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 185.1ms TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:09:08,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2021-05-06 11:09:08,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 256. [2021-05-06 11:09:08,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 250 states have (on average 1.316) internal successors, (329), 250 states have internal predecessors, (329), 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) [2021-05-06 11:09:08,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 334 transitions. [2021-05-06 11:09:08,783 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 334 transitions. Word has length 239 [2021-05-06 11:09:08,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:08,783 INFO L480 AbstractCegarLoop]: Abstraction has 256 states and 334 transitions. [2021-05-06 11:09:08,783 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 3.619047619047619) internal successors, (76), 20 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:08,783 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 334 transitions. [2021-05-06 11:09:08,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 252 [2021-05-06 11:09:08,785 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:08,785 INFO L523 BasicCegarLoop]: trace histogram [68, 68, 68, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:08,785 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-05-06 11:09:08,785 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:08,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:08,786 INFO L82 PathProgramCache]: Analyzing trace with hash 1698600790, now seen corresponding path program 23 times [2021-05-06 11:09:08,786 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:08,786 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2118835845] [2021-05-06 11:09:08,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:08,791 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:08,791 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:08,792 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:08,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:09,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:09,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:09,086 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:09,086 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:09,086 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2118835845] [2021-05-06 11:09:09,086 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2118835845] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:09,086 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:09,086 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:09:09,086 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1793242513] [2021-05-06 11:09:09,086 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:09:09,086 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:09,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:09:09,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:09:09,087 INFO L87 Difference]: Start difference. First operand 256 states and 334 transitions. Second operand has 22 states, 22 states have (on average 3.590909090909091) internal successors, (79), 21 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:09,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:09,244 INFO L93 Difference]: Finished difference Result 456 states and 602 transitions. [2021-05-06 11:09:09,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 11:09:09,244 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.590909090909091) internal successors, (79), 21 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 251 [2021-05-06 11:09:09,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:09,245 INFO L225 Difference]: With dead ends: 456 [2021-05-06 11:09:09,245 INFO L226 Difference]: Without dead ends: 276 [2021-05-06 11:09:09,246 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 180.9ms TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:09:09,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2021-05-06 11:09:09,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 268. [2021-05-06 11:09:09,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 268 states, 262 states have (on average 1.316793893129771) internal successors, (345), 262 states have internal predecessors, (345), 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) [2021-05-06 11:09:09,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 350 transitions. [2021-05-06 11:09:09,268 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 350 transitions. Word has length 251 [2021-05-06 11:09:09,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:09,268 INFO L480 AbstractCegarLoop]: Abstraction has 268 states and 350 transitions. [2021-05-06 11:09:09,268 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 3.590909090909091) internal successors, (79), 21 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:09,268 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 350 transitions. [2021-05-06 11:09:09,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 264 [2021-05-06 11:09:09,269 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:09,269 INFO L523 BasicCegarLoop]: trace histogram [72, 72, 72, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:09,269 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-05-06 11:09:09,269 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:09,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:09,270 INFO L82 PathProgramCache]: Analyzing trace with hash 2083699890, now seen corresponding path program 24 times [2021-05-06 11:09:09,270 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:09,270 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [253666846] [2021-05-06 11:09:09,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:09,277 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:09,277 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:09,279 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:09,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:09,615 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:09,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:09,618 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:09,618 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:09,618 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [253666846] [2021-05-06 11:09:09,619 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [253666846] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:09,619 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:09,619 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 11:09:09,619 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44236602] [2021-05-06 11:09:09,619 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 11:09:09,619 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:09,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 11:09:09,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:09:09,619 INFO L87 Difference]: Start difference. First operand 268 states and 350 transitions. Second operand has 23 states, 23 states have (on average 3.5652173913043477) internal successors, (82), 22 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:09,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:09,800 INFO L93 Difference]: Finished difference Result 477 states and 630 transitions. [2021-05-06 11:09:09,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 11:09:09,800 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.5652173913043477) internal successors, (82), 22 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 263 [2021-05-06 11:09:09,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:09,801 INFO L225 Difference]: With dead ends: 477 [2021-05-06 11:09:09,801 INFO L226 Difference]: Without dead ends: 288 [2021-05-06 11:09:09,801 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 214.6ms TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:09:09,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2021-05-06 11:09:09,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 280. [2021-05-06 11:09:09,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 280 states, 274 states have (on average 1.3175182481751824) internal successors, (361), 274 states have internal predecessors, (361), 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) [2021-05-06 11:09:09,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 366 transitions. [2021-05-06 11:09:09,846 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 366 transitions. Word has length 263 [2021-05-06 11:09:09,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:09,847 INFO L480 AbstractCegarLoop]: Abstraction has 280 states and 366 transitions. [2021-05-06 11:09:09,847 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 3.5652173913043477) internal successors, (82), 22 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:09,847 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 366 transitions. [2021-05-06 11:09:09,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2021-05-06 11:09:09,847 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:09,848 INFO L523 BasicCegarLoop]: trace histogram [76, 76, 76, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:09,848 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-05-06 11:09:09,848 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:09,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:09,848 INFO L82 PathProgramCache]: Analyzing trace with hash 2129570262, now seen corresponding path program 25 times [2021-05-06 11:09:09,848 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:09,848 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1307258118] [2021-05-06 11:09:09,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:09,862 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:09,862 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:09,863 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:09,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:10,224 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:10,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:10,230 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:10,231 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:10,231 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1307258118] [2021-05-06 11:09:10,231 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1307258118] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:10,231 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:10,231 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:09:10,231 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250268773] [2021-05-06 11:09:10,231 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:09:10,232 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:10,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:09:10,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:09:10,233 INFO L87 Difference]: Start difference. First operand 280 states and 366 transitions. Second operand has 24 states, 24 states have (on average 3.5416666666666665) internal successors, (85), 23 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:10,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:10,398 INFO L93 Difference]: Finished difference Result 490 states and 646 transitions. [2021-05-06 11:09:10,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 11:09:10,398 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.5416666666666665) internal successors, (85), 23 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 275 [2021-05-06 11:09:10,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:10,399 INFO L225 Difference]: With dead ends: 490 [2021-05-06 11:09:10,399 INFO L226 Difference]: Without dead ends: 292 [2021-05-06 11:09:10,400 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 211.5ms TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:09:10,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2021-05-06 11:09:10,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 292. [2021-05-06 11:09:10,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 286 states have (on average 1.3181818181818181) internal successors, (377), 286 states have internal predecessors, (377), 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) [2021-05-06 11:09:10,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 382 transitions. [2021-05-06 11:09:10,426 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 382 transitions. Word has length 275 [2021-05-06 11:09:10,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:10,426 INFO L480 AbstractCegarLoop]: Abstraction has 292 states and 382 transitions. [2021-05-06 11:09:10,427 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 3.5416666666666665) internal successors, (85), 23 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:10,427 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 382 transitions. [2021-05-06 11:09:10,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2021-05-06 11:09:10,427 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:10,427 INFO L523 BasicCegarLoop]: trace histogram [80, 80, 80, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:10,428 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-05-06 11:09:10,428 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:10,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:10,428 INFO L82 PathProgramCache]: Analyzing trace with hash -1865616078, now seen corresponding path program 26 times [2021-05-06 11:09:10,428 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:10,428 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [285615768] [2021-05-06 11:09:10,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:10,433 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:10,433 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:10,434 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:10,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:10,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:10,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:10,642 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:10,642 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:10,642 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [285615768] [2021-05-06 11:09:10,642 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [285615768] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:10,642 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:10,642 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:09:10,642 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079242582] [2021-05-06 11:09:10,643 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:09:10,643 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:10,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:09:10,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:09:10,643 INFO L87 Difference]: Start difference. First operand 292 states and 382 transitions. Second operand has 9 states, 9 states have (on average 4.888888888888889) internal successors, (44), 8 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:10,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:10,817 INFO L93 Difference]: Finished difference Result 421 states and 545 transitions. [2021-05-06 11:09:10,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:09:10,817 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.888888888888889) internal successors, (44), 8 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 287 [2021-05-06 11:09:10,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:10,819 INFO L225 Difference]: With dead ends: 421 [2021-05-06 11:09:10,819 INFO L226 Difference]: Without dead ends: 405 [2021-05-06 11:09:10,820 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 55.5ms TimeCoverageRelationStatistics Valid=58, Invalid=98, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:09:10,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 405 states. [2021-05-06 11:09:10,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 405 to 355. [2021-05-06 11:09:10,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 355 states, 349 states have (on average 1.320916905444126) internal successors, (461), 349 states have internal predecessors, (461), 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) [2021-05-06 11:09:10,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 355 states to 355 states and 466 transitions. [2021-05-06 11:09:10,861 INFO L78 Accepts]: Start accepts. Automaton has 355 states and 466 transitions. Word has length 287 [2021-05-06 11:09:10,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:10,862 INFO L480 AbstractCegarLoop]: Abstraction has 355 states and 466 transitions. [2021-05-06 11:09:10,862 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.888888888888889) internal successors, (44), 8 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:10,862 INFO L276 IsEmpty]: Start isEmpty. Operand 355 states and 466 transitions. [2021-05-06 11:09:10,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 351 [2021-05-06 11:09:10,863 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:10,864 INFO L523 BasicCegarLoop]: trace histogram [100, 100, 100, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:10,864 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-05-06 11:09:10,864 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:10,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:10,864 INFO L82 PathProgramCache]: Analyzing trace with hash 1824488221, now seen corresponding path program 27 times [2021-05-06 11:09:10,864 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:10,864 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1982702945] [2021-05-06 11:09:10,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:10,870 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:10,870 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:10,870 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:10,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:11,085 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:11,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:11,088 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:11,088 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:11,088 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1982702945] [2021-05-06 11:09:11,089 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1982702945] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:11,089 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:11,089 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 11:09:11,089 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971511951] [2021-05-06 11:09:11,089 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 11:09:11,089 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:11,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 11:09:11,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:09:11,090 INFO L87 Difference]: Start difference. First operand 355 states and 466 transitions. Second operand has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 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) [2021-05-06 11:09:11,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:11,190 INFO L93 Difference]: Finished difference Result 380 states and 494 transitions. [2021-05-06 11:09:11,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 11:09:11,191 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 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 350 [2021-05-06 11:09:11,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:11,192 INFO L225 Difference]: With dead ends: 380 [2021-05-06 11:09:11,192 INFO L226 Difference]: Without dead ends: 369 [2021-05-06 11:09:11,192 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 23.6ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:09:11,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2021-05-06 11:09:11,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 358. [2021-05-06 11:09:11,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 358 states, 352 states have (on average 1.3181818181818181) internal successors, (464), 352 states have internal predecessors, (464), 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) [2021-05-06 11:09:11,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 358 states to 358 states and 469 transitions. [2021-05-06 11:09:11,225 INFO L78 Accepts]: Start accepts. Automaton has 358 states and 469 transitions. Word has length 350 [2021-05-06 11:09:11,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:11,225 INFO L480 AbstractCegarLoop]: Abstraction has 358 states and 469 transitions. [2021-05-06 11:09:11,225 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 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) [2021-05-06 11:09:11,226 INFO L276 IsEmpty]: Start isEmpty. Operand 358 states and 469 transitions. [2021-05-06 11:09:11,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 354 [2021-05-06 11:09:11,227 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:11,227 INFO L523 BasicCegarLoop]: trace histogram [100, 100, 100, 5, 5, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:11,227 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-05-06 11:09:11,227 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:11,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:11,227 INFO L82 PathProgramCache]: Analyzing trace with hash 1130438452, now seen corresponding path program 28 times [2021-05-06 11:09:11,227 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:11,228 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [508780919] [2021-05-06 11:09:11,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:11,233 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:11,233 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:11,233 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:11,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:11,455 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:11,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:11,459 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:11,459 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:11,460 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [508780919] [2021-05-06 11:09:11,460 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [508780919] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:11,460 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:11,460 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 11:09:11,460 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712798424] [2021-05-06 11:09:11,460 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 11:09:11,461 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:11,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 11:09:11,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:09:11,461 INFO L87 Difference]: Start difference. First operand 358 states and 469 transitions. Second operand has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 6 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:11,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:11,594 INFO L93 Difference]: Finished difference Result 391 states and 507 transitions. [2021-05-06 11:09:11,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 11:09:11,594 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 6 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 353 [2021-05-06 11:09:11,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:11,596 INFO L225 Difference]: With dead ends: 391 [2021-05-06 11:09:11,596 INFO L226 Difference]: Without dead ends: 380 [2021-05-06 11:09:11,596 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 27.8ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:09:11,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 380 states. [2021-05-06 11:09:11,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 380 to 361. [2021-05-06 11:09:11,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 361 states, 355 states have (on average 1.315492957746479) internal successors, (467), 355 states have internal predecessors, (467), 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) [2021-05-06 11:09:11,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 361 states to 361 states and 472 transitions. [2021-05-06 11:09:11,630 INFO L78 Accepts]: Start accepts. Automaton has 361 states and 472 transitions. Word has length 353 [2021-05-06 11:09:11,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:11,631 INFO L480 AbstractCegarLoop]: Abstraction has 361 states and 472 transitions. [2021-05-06 11:09:11,631 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 6 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:11,631 INFO L276 IsEmpty]: Start isEmpty. Operand 361 states and 472 transitions. [2021-05-06 11:09:11,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 357 [2021-05-06 11:09:11,632 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:11,632 INFO L523 BasicCegarLoop]: trace histogram [100, 100, 100, 5, 5, 5, 5, 5, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:11,632 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-05-06 11:09:11,632 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:11,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:11,632 INFO L82 PathProgramCache]: Analyzing trace with hash 666333117, now seen corresponding path program 29 times [2021-05-06 11:09:11,632 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:11,633 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1784290502] [2021-05-06 11:09:11,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:11,637 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:11,637 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:11,638 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:11,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:11,852 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:11,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:11,855 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:11,855 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:11,855 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1784290502] [2021-05-06 11:09:11,855 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1784290502] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:11,855 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:11,855 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 11:09:11,855 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872192520] [2021-05-06 11:09:11,855 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 11:09:11,855 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:11,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 11:09:11,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:09:11,856 INFO L87 Difference]: Start difference. First operand 361 states and 472 transitions. Second operand has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:11,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:12,000 INFO L93 Difference]: Finished difference Result 405 states and 524 transitions. [2021-05-06 11:09:12,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:09:12,000 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 356 [2021-05-06 11:09:12,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:12,001 INFO L225 Difference]: With dead ends: 405 [2021-05-06 11:09:12,001 INFO L226 Difference]: Without dead ends: 394 [2021-05-06 11:09:12,002 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 33.3ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:09:12,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2021-05-06 11:09:12,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 364. [2021-05-06 11:09:12,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 364 states, 358 states have (on average 1.312849162011173) internal successors, (470), 358 states have internal predecessors, (470), 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) [2021-05-06 11:09:12,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 475 transitions. [2021-05-06 11:09:12,033 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 475 transitions. Word has length 356 [2021-05-06 11:09:12,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:12,034 INFO L480 AbstractCegarLoop]: Abstraction has 364 states and 475 transitions. [2021-05-06 11:09:12,034 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:12,034 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 475 transitions. [2021-05-06 11:09:12,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 360 [2021-05-06 11:09:12,035 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:12,035 INFO L523 BasicCegarLoop]: trace histogram [100, 100, 100, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:12,035 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-05-06 11:09:12,035 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:12,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:12,035 INFO L82 PathProgramCache]: Analyzing trace with hash 4023956, now seen corresponding path program 30 times [2021-05-06 11:09:12,035 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:12,035 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [726759675] [2021-05-06 11:09:12,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:12,041 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:12,041 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:12,041 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:12,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:12,243 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:12,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:12,247 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:12,247 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:12,247 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [726759675] [2021-05-06 11:09:12,247 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [726759675] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:12,247 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:12,247 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:09:12,247 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512870587] [2021-05-06 11:09:12,248 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:09:12,248 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:12,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:09:12,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:09:12,248 INFO L87 Difference]: Start difference. First operand 364 states and 475 transitions. Second operand has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:12,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:12,410 INFO L93 Difference]: Finished difference Result 484 states and 628 transitions. [2021-05-06 11:09:12,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:09:12,410 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 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 359 [2021-05-06 11:09:12,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:12,412 INFO L225 Difference]: With dead ends: 484 [2021-05-06 11:09:12,412 INFO L226 Difference]: Without dead ends: 473 [2021-05-06 11:09:12,412 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 40.2ms TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:09:12,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 473 states. [2021-05-06 11:09:12,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 473 to 367. [2021-05-06 11:09:12,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 367 states, 361 states have (on average 1.3102493074792243) internal successors, (473), 361 states have internal predecessors, (473), 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) [2021-05-06 11:09:12,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 478 transitions. [2021-05-06 11:09:12,453 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 478 transitions. Word has length 359 [2021-05-06 11:09:12,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:12,453 INFO L480 AbstractCegarLoop]: Abstraction has 367 states and 478 transitions. [2021-05-06 11:09:12,453 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:12,453 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 478 transitions. [2021-05-06 11:09:12,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 363 [2021-05-06 11:09:12,454 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:12,454 INFO L523 BasicCegarLoop]: trace histogram [100, 100, 100, 5, 5, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:12,454 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2021-05-06 11:09:12,454 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:12,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:12,455 INFO L82 PathProgramCache]: Analyzing trace with hash 231566429, now seen corresponding path program 31 times [2021-05-06 11:09:12,455 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:12,455 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [732783298] [2021-05-06 11:09:12,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:12,467 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:12,467 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:12,468 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:12,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:12,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:12,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:12,671 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:12,672 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:12,672 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [732783298] [2021-05-06 11:09:12,672 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [732783298] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:12,672 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:12,672 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-06 11:09:12,672 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827295472] [2021-05-06 11:09:12,673 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 11:09:12,673 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:12,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 11:09:12,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:09:12,673 INFO L87 Difference]: Start difference. First operand 367 states and 478 transitions. Second operand has 10 states, 10 states have (on average 3.8) internal successors, (38), 9 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:12,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:12,868 INFO L93 Difference]: Finished difference Result 567 states and 738 transitions. [2021-05-06 11:09:12,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 11:09:12,869 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 9 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 362 [2021-05-06 11:09:12,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:12,870 INFO L225 Difference]: With dead ends: 567 [2021-05-06 11:09:12,870 INFO L226 Difference]: Without dead ends: 556 [2021-05-06 11:09:12,871 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 45.9ms TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-06 11:09:12,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 556 states. [2021-05-06 11:09:12,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 556 to 370. [2021-05-06 11:09:12,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 370 states, 364 states have (on average 1.3076923076923077) internal successors, (476), 364 states have internal predecessors, (476), 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) [2021-05-06 11:09:12,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 370 states to 370 states and 481 transitions. [2021-05-06 11:09:12,906 INFO L78 Accepts]: Start accepts. Automaton has 370 states and 481 transitions. Word has length 362 [2021-05-06 11:09:12,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:12,906 INFO L480 AbstractCegarLoop]: Abstraction has 370 states and 481 transitions. [2021-05-06 11:09:12,906 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 9 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:12,906 INFO L276 IsEmpty]: Start isEmpty. Operand 370 states and 481 transitions. [2021-05-06 11:09:12,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 366 [2021-05-06 11:09:12,907 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:12,907 INFO L523 BasicCegarLoop]: trace histogram [100, 100, 100, 6, 6, 6, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:12,907 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-05-06 11:09:12,908 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:12,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:12,908 INFO L82 PathProgramCache]: Analyzing trace with hash 1490986484, now seen corresponding path program 32 times [2021-05-06 11:09:12,908 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:12,908 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1120844503] [2021-05-06 11:09:12,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:12,914 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:12,914 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:12,915 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:13,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:13,136 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:13,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:13,138 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:13,138 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:13,139 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1120844503] [2021-05-06 11:09:13,139 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1120844503] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:13,139 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:13,139 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-06 11:09:13,139 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240356411] [2021-05-06 11:09:13,139 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-06 11:09:13,139 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:13,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-06 11:09:13,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:09:13,139 INFO L87 Difference]: Start difference. First operand 370 states and 481 transitions. Second operand has 11 states, 11 states have (on average 3.727272727272727) internal successors, (41), 10 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:13,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:13,365 INFO L93 Difference]: Finished difference Result 650 states and 848 transitions. [2021-05-06 11:09:13,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 11:09:13,365 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.727272727272727) internal successors, (41), 10 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 365 [2021-05-06 11:09:13,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:13,367 INFO L225 Difference]: With dead ends: 650 [2021-05-06 11:09:13,367 INFO L226 Difference]: Without dead ends: 639 [2021-05-06 11:09:13,368 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 52.4ms TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:09:13,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 639 states. [2021-05-06 11:09:13,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 639 to 373. [2021-05-06 11:09:13,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 373 states, 367 states have (on average 1.3051771117166213) internal successors, (479), 367 states have internal predecessors, (479), 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) [2021-05-06 11:09:13,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 373 states to 373 states and 484 transitions. [2021-05-06 11:09:13,405 INFO L78 Accepts]: Start accepts. Automaton has 373 states and 484 transitions. Word has length 365 [2021-05-06 11:09:13,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:13,405 INFO L480 AbstractCegarLoop]: Abstraction has 373 states and 484 transitions. [2021-05-06 11:09:13,405 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.727272727272727) internal successors, (41), 10 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:13,405 INFO L276 IsEmpty]: Start isEmpty. Operand 373 states and 484 transitions. [2021-05-06 11:09:13,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 369 [2021-05-06 11:09:13,406 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:13,406 INFO L523 BasicCegarLoop]: trace histogram [100, 100, 100, 7, 7, 7, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:13,407 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-05-06 11:09:13,407 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:13,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:13,407 INFO L82 PathProgramCache]: Analyzing trace with hash 39547133, now seen corresponding path program 33 times [2021-05-06 11:09:13,407 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:13,407 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2033061984] [2021-05-06 11:09:13,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:13,412 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:13,412 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:13,413 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:13,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:13,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:13,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:13,654 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:13,655 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:13,655 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2033061984] [2021-05-06 11:09:13,655 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2033061984] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:13,655 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:13,655 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-06 11:09:13,655 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283626962] [2021-05-06 11:09:13,655 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 11:09:13,655 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:13,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 11:09:13,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:09:13,655 INFO L87 Difference]: Start difference. First operand 373 states and 484 transitions. Second operand has 12 states, 12 states have (on average 3.6666666666666665) internal successors, (44), 11 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:13,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:13,927 INFO L93 Difference]: Finished difference Result 733 states and 958 transitions. [2021-05-06 11:09:13,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 11:09:13,927 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.6666666666666665) internal successors, (44), 11 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 368 [2021-05-06 11:09:13,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:13,930 INFO L225 Difference]: With dead ends: 733 [2021-05-06 11:09:13,931 INFO L226 Difference]: Without dead ends: 722 [2021-05-06 11:09:13,931 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 61.4ms TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-05-06 11:09:13,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 722 states. [2021-05-06 11:09:13,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 722 to 376. [2021-05-06 11:09:13,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 376 states, 370 states have (on average 1.3027027027027027) internal successors, (482), 370 states have internal predecessors, (482), 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) [2021-05-06 11:09:13,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 376 states to 376 states and 487 transitions. [2021-05-06 11:09:13,972 INFO L78 Accepts]: Start accepts. Automaton has 376 states and 487 transitions. Word has length 368 [2021-05-06 11:09:13,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:13,973 INFO L480 AbstractCegarLoop]: Abstraction has 376 states and 487 transitions. [2021-05-06 11:09:13,973 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.6666666666666665) internal successors, (44), 11 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:13,973 INFO L276 IsEmpty]: Start isEmpty. Operand 376 states and 487 transitions. [2021-05-06 11:09:13,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 372 [2021-05-06 11:09:13,983 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:13,983 INFO L523 BasicCegarLoop]: trace histogram [100, 100, 100, 8, 8, 8, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:13,983 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-05-06 11:09:13,983 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:13,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:13,984 INFO L82 PathProgramCache]: Analyzing trace with hash 1940577620, now seen corresponding path program 34 times [2021-05-06 11:09:13,984 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:13,984 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [773794619] [2021-05-06 11:09:13,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:13,989 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:13,990 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:13,990 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:14,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:14,241 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:14,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:14,247 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:14,247 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:14,247 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [773794619] [2021-05-06 11:09:14,247 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [773794619] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:14,247 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:14,247 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-06 11:09:14,247 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394383833] [2021-05-06 11:09:14,248 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 11:09:14,248 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:14,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 11:09:14,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:09:14,248 INFO L87 Difference]: Start difference. First operand 376 states and 487 transitions. Second operand has 13 states, 13 states have (on average 3.6153846153846154) internal successors, (47), 12 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:14,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:14,554 INFO L93 Difference]: Finished difference Result 816 states and 1068 transitions. [2021-05-06 11:09:14,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-06 11:09:14,554 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.6153846153846154) internal successors, (47), 12 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 371 [2021-05-06 11:09:14,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:14,558 INFO L225 Difference]: With dead ends: 816 [2021-05-06 11:09:14,558 INFO L226 Difference]: Without dead ends: 805 [2021-05-06 11:09:14,558 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 72.9ms TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:09:14,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 805 states. [2021-05-06 11:09:14,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 805 to 379. [2021-05-06 11:09:14,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 379 states, 373 states have (on average 1.3002680965147453) internal successors, (485), 373 states have internal predecessors, (485), 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) [2021-05-06 11:09:14,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 379 states to 379 states and 490 transitions. [2021-05-06 11:09:14,600 INFO L78 Accepts]: Start accepts. Automaton has 379 states and 490 transitions. Word has length 371 [2021-05-06 11:09:14,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:14,601 INFO L480 AbstractCegarLoop]: Abstraction has 379 states and 490 transitions. [2021-05-06 11:09:14,601 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.6153846153846154) internal successors, (47), 12 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:14,601 INFO L276 IsEmpty]: Start isEmpty. Operand 379 states and 490 transitions. [2021-05-06 11:09:14,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 375 [2021-05-06 11:09:14,602 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:14,602 INFO L523 BasicCegarLoop]: trace histogram [100, 100, 100, 9, 9, 9, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:14,602 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-05-06 11:09:14,602 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:14,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:14,602 INFO L82 PathProgramCache]: Analyzing trace with hash 2101050781, now seen corresponding path program 35 times [2021-05-06 11:09:14,602 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:14,603 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2010678997] [2021-05-06 11:09:14,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:14,607 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:14,607 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:14,611 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:14,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:14,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:14,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:14,866 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:14,867 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:14,867 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2010678997] [2021-05-06 11:09:14,867 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2010678997] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:14,867 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:14,867 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-06 11:09:14,867 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927933612] [2021-05-06 11:09:14,867 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 11:09:14,867 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:14,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 11:09:14,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:09:14,868 INFO L87 Difference]: Start difference. First operand 379 states and 490 transitions. Second operand has 14 states, 14 states have (on average 3.5714285714285716) internal successors, (50), 13 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:15,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:15,226 INFO L93 Difference]: Finished difference Result 899 states and 1178 transitions. [2021-05-06 11:09:15,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-06 11:09:15,227 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.5714285714285716) internal successors, (50), 13 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 374 [2021-05-06 11:09:15,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:15,229 INFO L225 Difference]: With dead ends: 899 [2021-05-06 11:09:15,229 INFO L226 Difference]: Without dead ends: 888 [2021-05-06 11:09:15,230 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 84.8ms TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2021-05-06 11:09:15,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 888 states. [2021-05-06 11:09:15,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 888 to 382. [2021-05-06 11:09:15,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 376 states have (on average 1.297872340425532) internal successors, (488), 376 states have internal predecessors, (488), 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) [2021-05-06 11:09:15,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 493 transitions. [2021-05-06 11:09:15,272 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 493 transitions. Word has length 374 [2021-05-06 11:09:15,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:15,281 INFO L480 AbstractCegarLoop]: Abstraction has 382 states and 493 transitions. [2021-05-06 11:09:15,282 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.5714285714285716) internal successors, (50), 13 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:15,282 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 493 transitions. [2021-05-06 11:09:15,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 378 [2021-05-06 11:09:15,283 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:15,283 INFO L523 BasicCegarLoop]: trace histogram [100, 100, 100, 10, 10, 10, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:15,283 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-05-06 11:09:15,283 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:15,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:15,283 INFO L82 PathProgramCache]: Analyzing trace with hash -1836577612, now seen corresponding path program 36 times [2021-05-06 11:09:15,283 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:15,283 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [689913035] [2021-05-06 11:09:15,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:15,289 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:15,289 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:15,291 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:15,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:15,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:15,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:15,541 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:15,541 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:15,541 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [689913035] [2021-05-06 11:09:15,541 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [689913035] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:15,541 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:15,541 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-06 11:09:15,541 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333747211] [2021-05-06 11:09:15,541 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-06 11:09:15,541 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:15,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-06 11:09:15,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:09:15,542 INFO L87 Difference]: Start difference. First operand 382 states and 493 transitions. Second operand has 15 states, 15 states have (on average 3.533333333333333) internal successors, (53), 14 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:15,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:15,952 INFO L93 Difference]: Finished difference Result 982 states and 1288 transitions. [2021-05-06 11:09:15,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 11:09:15,952 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.533333333333333) internal successors, (53), 14 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 377 [2021-05-06 11:09:15,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:15,955 INFO L225 Difference]: With dead ends: 982 [2021-05-06 11:09:15,955 INFO L226 Difference]: Without dead ends: 971 [2021-05-06 11:09:15,957 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 93.1ms TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:09:15,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 971 states. [2021-05-06 11:09:16,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 971 to 385. [2021-05-06 11:09:16,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 385 states, 379 states have (on average 1.2955145118733509) internal successors, (491), 379 states have internal predecessors, (491), 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) [2021-05-06 11:09:16,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 385 states to 385 states and 496 transitions. [2021-05-06 11:09:16,005 INFO L78 Accepts]: Start accepts. Automaton has 385 states and 496 transitions. Word has length 377 [2021-05-06 11:09:16,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:16,006 INFO L480 AbstractCegarLoop]: Abstraction has 385 states and 496 transitions. [2021-05-06 11:09:16,006 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 3.533333333333333) internal successors, (53), 14 states have internal predecessors, (53), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:16,007 INFO L276 IsEmpty]: Start isEmpty. Operand 385 states and 496 transitions. [2021-05-06 11:09:16,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 381 [2021-05-06 11:09:16,008 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:16,008 INFO L523 BasicCegarLoop]: trace histogram [100, 100, 100, 11, 11, 11, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:16,008 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2021-05-06 11:09:16,008 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:16,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:16,008 INFO L82 PathProgramCache]: Analyzing trace with hash 717722173, now seen corresponding path program 37 times [2021-05-06 11:09:16,008 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:16,008 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [124544749] [2021-05-06 11:09:16,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:16,013 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:16,013 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:16,014 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:16,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:16,277 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:16,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:16,280 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:16,280 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:16,280 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [124544749] [2021-05-06 11:09:16,281 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [124544749] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:16,281 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:16,281 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-06 11:09:16,281 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251650882] [2021-05-06 11:09:16,281 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-06 11:09:16,281 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:16,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-06 11:09:16,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:09:16,281 INFO L87 Difference]: Start difference. First operand 385 states and 496 transitions. Second operand has 16 states, 16 states have (on average 3.5) internal successors, (56), 15 states have internal predecessors, (56), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:16,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:16,772 INFO L93 Difference]: Finished difference Result 1065 states and 1398 transitions. [2021-05-06 11:09:16,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-06 11:09:16,772 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.5) internal successors, (56), 15 states have internal predecessors, (56), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 380 [2021-05-06 11:09:16,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:16,775 INFO L225 Difference]: With dead ends: 1065 [2021-05-06 11:09:16,775 INFO L226 Difference]: Without dead ends: 1054 [2021-05-06 11:09:16,776 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 104.3ms TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2021-05-06 11:09:16,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1054 states. [2021-05-06 11:09:16,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1054 to 388. [2021-05-06 11:09:16,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 382 states have (on average 1.293193717277487) internal successors, (494), 382 states have internal predecessors, (494), 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) [2021-05-06 11:09:16,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 499 transitions. [2021-05-06 11:09:16,829 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 499 transitions. Word has length 380 [2021-05-06 11:09:16,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:16,830 INFO L480 AbstractCegarLoop]: Abstraction has 388 states and 499 transitions. [2021-05-06 11:09:16,830 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.5) internal successors, (56), 15 states have internal predecessors, (56), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:16,830 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 499 transitions. [2021-05-06 11:09:16,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 384 [2021-05-06 11:09:16,831 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:16,831 INFO L523 BasicCegarLoop]: trace histogram [100, 100, 100, 12, 12, 12, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:16,831 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2021-05-06 11:09:16,831 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:16,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:16,831 INFO L82 PathProgramCache]: Analyzing trace with hash 1927033876, now seen corresponding path program 38 times [2021-05-06 11:09:16,831 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:16,831 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1504104729] [2021-05-06 11:09:16,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:16,836 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:16,837 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:16,837 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:16,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:17,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:17,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:17,124 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:17,124 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:17,124 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1504104729] [2021-05-06 11:09:17,124 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1504104729] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:17,124 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:17,124 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-05-06 11:09:17,124 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88049769] [2021-05-06 11:09:17,125 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-06 11:09:17,125 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:17,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-06 11:09:17,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:09:17,125 INFO L87 Difference]: Start difference. First operand 388 states and 499 transitions. Second operand has 17 states, 17 states have (on average 3.4705882352941178) internal successors, (59), 16 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:17,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:17,757 INFO L93 Difference]: Finished difference Result 1148 states and 1508 transitions. [2021-05-06 11:09:17,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-06 11:09:17,758 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.4705882352941178) internal successors, (59), 16 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 383 [2021-05-06 11:09:17,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:17,779 INFO L225 Difference]: With dead ends: 1148 [2021-05-06 11:09:17,779 INFO L226 Difference]: Without dead ends: 1137 [2021-05-06 11:09:17,779 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 118.1ms TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2021-05-06 11:09:17,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1137 states. [2021-05-06 11:09:17,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1137 to 391. [2021-05-06 11:09:17,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 385 states have (on average 1.290909090909091) internal successors, (497), 385 states have internal predecessors, (497), 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) [2021-05-06 11:09:17,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 502 transitions. [2021-05-06 11:09:17,883 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 502 transitions. Word has length 383 [2021-05-06 11:09:17,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:17,884 INFO L480 AbstractCegarLoop]: Abstraction has 391 states and 502 transitions. [2021-05-06 11:09:17,884 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 3.4705882352941178) internal successors, (59), 16 states have internal predecessors, (59), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:17,884 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 502 transitions. [2021-05-06 11:09:17,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 387 [2021-05-06 11:09:17,885 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:17,885 INFO L523 BasicCegarLoop]: trace histogram [100, 100, 100, 13, 13, 13, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:17,885 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-05-06 11:09:17,885 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:17,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:17,885 INFO L82 PathProgramCache]: Analyzing trace with hash -1948668195, now seen corresponding path program 39 times [2021-05-06 11:09:17,886 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:17,886 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [283807416] [2021-05-06 11:09:17,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:17,892 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:17,892 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:17,893 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:18,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:18,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:18,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:18,252 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:18,253 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:18,253 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [283807416] [2021-05-06 11:09:18,253 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [283807416] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:18,253 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:18,253 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-05-06 11:09:18,253 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210482093] [2021-05-06 11:09:18,253 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 11:09:18,253 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:18,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 11:09:18,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:09:18,254 INFO L87 Difference]: Start difference. First operand 391 states and 502 transitions. Second operand has 18 states, 18 states have (on average 3.4444444444444446) internal successors, (62), 17 states have internal predecessors, (62), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:18,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:18,817 INFO L93 Difference]: Finished difference Result 1231 states and 1618 transitions. [2021-05-06 11:09:18,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-06 11:09:18,818 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.4444444444444446) internal successors, (62), 17 states have internal predecessors, (62), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 386 [2021-05-06 11:09:18,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:18,821 INFO L225 Difference]: With dead ends: 1231 [2021-05-06 11:09:18,821 INFO L226 Difference]: Without dead ends: 1220 [2021-05-06 11:09:18,822 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 135.4ms TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2021-05-06 11:09:18,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1220 states. [2021-05-06 11:09:18,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1220 to 394. [2021-05-06 11:09:18,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 394 states, 388 states have (on average 1.288659793814433) internal successors, (500), 388 states have internal predecessors, (500), 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) [2021-05-06 11:09:18,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 394 states to 394 states and 505 transitions. [2021-05-06 11:09:18,873 INFO L78 Accepts]: Start accepts. Automaton has 394 states and 505 transitions. Word has length 386 [2021-05-06 11:09:18,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:18,873 INFO L480 AbstractCegarLoop]: Abstraction has 394 states and 505 transitions. [2021-05-06 11:09:18,874 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 3.4444444444444446) internal successors, (62), 17 states have internal predecessors, (62), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:18,874 INFO L276 IsEmpty]: Start isEmpty. Operand 394 states and 505 transitions. [2021-05-06 11:09:18,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2021-05-06 11:09:18,875 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:18,875 INFO L523 BasicCegarLoop]: trace histogram [100, 100, 100, 14, 14, 14, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:18,875 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2021-05-06 11:09:18,875 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:18,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:18,875 INFO L82 PathProgramCache]: Analyzing trace with hash -1383246988, now seen corresponding path program 40 times [2021-05-06 11:09:18,875 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:18,875 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1230639148] [2021-05-06 11:09:18,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:18,881 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:18,881 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:18,881 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:18,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:19,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:19,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:19,204 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:19,204 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:19,204 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1230639148] [2021-05-06 11:09:19,204 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1230639148] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:19,204 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:19,204 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-06 11:09:19,204 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694575196] [2021-05-06 11:09:19,205 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-06 11:09:19,205 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:19,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-06 11:09:19,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:09:19,205 INFO L87 Difference]: Start difference. First operand 394 states and 505 transitions. Second operand has 19 states, 19 states have (on average 3.4210526315789473) internal successors, (65), 18 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:19,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:19,847 INFO L93 Difference]: Finished difference Result 1314 states and 1728 transitions. [2021-05-06 11:09:19,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-06 11:09:19,847 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.4210526315789473) internal successors, (65), 18 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 389 [2021-05-06 11:09:19,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:19,851 INFO L225 Difference]: With dead ends: 1314 [2021-05-06 11:09:19,851 INFO L226 Difference]: Without dead ends: 1303 [2021-05-06 11:09:19,851 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 143.0ms TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-05-06 11:09:19,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1303 states. [2021-05-06 11:09:19,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1303 to 397. [2021-05-06 11:09:19,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 397 states, 391 states have (on average 1.2864450127877238) internal successors, (503), 391 states have internal predecessors, (503), 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) [2021-05-06 11:09:19,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 397 states to 397 states and 508 transitions. [2021-05-06 11:09:19,922 INFO L78 Accepts]: Start accepts. Automaton has 397 states and 508 transitions. Word has length 389 [2021-05-06 11:09:19,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:19,922 INFO L480 AbstractCegarLoop]: Abstraction has 397 states and 508 transitions. [2021-05-06 11:09:19,922 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.4210526315789473) internal successors, (65), 18 states have internal predecessors, (65), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:19,922 INFO L276 IsEmpty]: Start isEmpty. Operand 397 states and 508 transitions. [2021-05-06 11:09:19,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 393 [2021-05-06 11:09:19,923 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:19,924 INFO L523 BasicCegarLoop]: trace histogram [100, 100, 100, 15, 15, 15, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:19,924 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2021-05-06 11:09:19,924 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:19,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:19,924 INFO L82 PathProgramCache]: Analyzing trace with hash -1781804163, now seen corresponding path program 41 times [2021-05-06 11:09:19,924 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:19,924 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1254021347] [2021-05-06 11:09:19,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:19,930 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:19,930 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:19,930 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:20,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:20,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:20,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:20,268 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:20,268 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:20,268 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1254021347] [2021-05-06 11:09:20,268 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1254021347] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:20,268 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:20,268 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-05-06 11:09:20,268 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537547320] [2021-05-06 11:09:20,268 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-06 11:09:20,268 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:20,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-06 11:09:20,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:09:20,269 INFO L87 Difference]: Start difference. First operand 397 states and 508 transitions. Second operand has 20 states, 20 states have (on average 3.4) internal successors, (68), 19 states have internal predecessors, (68), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:20,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:20,971 INFO L93 Difference]: Finished difference Result 1397 states and 1838 transitions. [2021-05-06 11:09:20,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-06 11:09:20,971 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.4) internal successors, (68), 19 states have internal predecessors, (68), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 392 [2021-05-06 11:09:20,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:20,975 INFO L225 Difference]: With dead ends: 1397 [2021-05-06 11:09:20,975 INFO L226 Difference]: Without dead ends: 1386 [2021-05-06 11:09:20,975 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 156.1ms TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2021-05-06 11:09:20,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1386 states. [2021-05-06 11:09:21,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1386 to 400. [2021-05-06 11:09:21,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 400 states, 394 states have (on average 1.284263959390863) internal successors, (506), 394 states have internal predecessors, (506), 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) [2021-05-06 11:09:21,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 511 transitions. [2021-05-06 11:09:21,031 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 511 transitions. Word has length 392 [2021-05-06 11:09:21,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:21,031 INFO L480 AbstractCegarLoop]: Abstraction has 400 states and 511 transitions. [2021-05-06 11:09:21,031 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 3.4) internal successors, (68), 19 states have internal predecessors, (68), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:21,032 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 511 transitions. [2021-05-06 11:09:21,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 396 [2021-05-06 11:09:21,033 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:21,033 INFO L523 BasicCegarLoop]: trace histogram [100, 100, 100, 16, 16, 16, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:21,033 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2021-05-06 11:09:21,033 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:21,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:21,033 INFO L82 PathProgramCache]: Analyzing trace with hash 385968852, now seen corresponding path program 42 times [2021-05-06 11:09:21,033 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:21,033 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [167574731] [2021-05-06 11:09:21,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:21,038 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:21,038 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:21,039 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:21,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:21,388 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:21,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:21,391 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:21,391 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:21,391 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [167574731] [2021-05-06 11:09:21,391 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [167574731] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:21,391 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:21,391 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-05-06 11:09:21,391 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [895884905] [2021-05-06 11:09:21,391 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-06 11:09:21,391 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:21,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-06 11:09:21,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:09:21,392 INFO L87 Difference]: Start difference. First operand 400 states and 511 transitions. Second operand has 21 states, 21 states have (on average 3.380952380952381) internal successors, (71), 20 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:22,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:22,191 INFO L93 Difference]: Finished difference Result 1480 states and 1948 transitions. [2021-05-06 11:09:22,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-06 11:09:22,191 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.380952380952381) internal successors, (71), 20 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 395 [2021-05-06 11:09:22,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:22,195 INFO L225 Difference]: With dead ends: 1480 [2021-05-06 11:09:22,195 INFO L226 Difference]: Without dead ends: 1469 [2021-05-06 11:09:22,195 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 171.8ms TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2021-05-06 11:09:22,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1469 states. [2021-05-06 11:09:22,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1469 to 403. [2021-05-06 11:09:22,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 397 states have (on average 1.2821158690176322) internal successors, (509), 397 states have internal predecessors, (509), 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) [2021-05-06 11:09:22,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 514 transitions. [2021-05-06 11:09:22,255 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 514 transitions. Word has length 395 [2021-05-06 11:09:22,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:22,255 INFO L480 AbstractCegarLoop]: Abstraction has 403 states and 514 transitions. [2021-05-06 11:09:22,255 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 3.380952380952381) internal successors, (71), 20 states have internal predecessors, (71), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:22,255 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 514 transitions. [2021-05-06 11:09:22,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 399 [2021-05-06 11:09:22,256 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:22,257 INFO L523 BasicCegarLoop]: trace histogram [100, 100, 100, 17, 17, 17, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:22,257 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2021-05-06 11:09:22,257 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:22,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:22,257 INFO L82 PathProgramCache]: Analyzing trace with hash 1383596061, now seen corresponding path program 43 times [2021-05-06 11:09:22,257 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:22,257 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [507698597] [2021-05-06 11:09:22,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:22,262 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:22,262 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:22,263 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:22,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:22,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:22,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:22,632 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:22,632 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:22,632 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [507698597] [2021-05-06 11:09:22,632 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [507698597] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:22,632 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:22,632 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2021-05-06 11:09:22,632 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595209042] [2021-05-06 11:09:22,632 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 11:09:22,632 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:22,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 11:09:22,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:09:22,633 INFO L87 Difference]: Start difference. First operand 403 states and 514 transitions. Second operand has 22 states, 22 states have (on average 3.3636363636363638) internal successors, (74), 21 states have internal predecessors, (74), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:23,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:23,500 INFO L93 Difference]: Finished difference Result 1563 states and 2058 transitions. [2021-05-06 11:09:23,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-06 11:09:23,500 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.3636363636363638) internal successors, (74), 21 states have internal predecessors, (74), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 398 [2021-05-06 11:09:23,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:23,504 INFO L225 Difference]: With dead ends: 1563 [2021-05-06 11:09:23,504 INFO L226 Difference]: Without dead ends: 1552 [2021-05-06 11:09:23,504 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 184.7ms TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2021-05-06 11:09:23,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1552 states. [2021-05-06 11:09:23,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1552 to 406. [2021-05-06 11:09:23,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 406 states, 400 states have (on average 1.28) internal successors, (512), 400 states have internal predecessors, (512), 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) [2021-05-06 11:09:23,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 406 states to 406 states and 517 transitions. [2021-05-06 11:09:23,566 INFO L78 Accepts]: Start accepts. Automaton has 406 states and 517 transitions. Word has length 398 [2021-05-06 11:09:23,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:23,566 INFO L480 AbstractCegarLoop]: Abstraction has 406 states and 517 transitions. [2021-05-06 11:09:23,566 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 3.3636363636363638) internal successors, (74), 21 states have internal predecessors, (74), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:23,566 INFO L276 IsEmpty]: Start isEmpty. Operand 406 states and 517 transitions. [2021-05-06 11:09:23,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 402 [2021-05-06 11:09:23,568 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:23,568 INFO L523 BasicCegarLoop]: trace histogram [100, 100, 100, 18, 18, 18, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:23,568 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2021-05-06 11:09:23,568 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:23,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:23,568 INFO L82 PathProgramCache]: Analyzing trace with hash 522091060, now seen corresponding path program 44 times [2021-05-06 11:09:23,569 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:23,569 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [340851141] [2021-05-06 11:09:23,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:23,574 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:23,574 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:23,575 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:23,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:23,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:23,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:23,962 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:23,962 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:23,962 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [340851141] [2021-05-06 11:09:23,962 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [340851141] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:23,962 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:23,962 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-05-06 11:09:23,962 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977414436] [2021-05-06 11:09:23,963 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-06 11:09:23,963 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:23,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-06 11:09:23,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:09:23,963 INFO L87 Difference]: Start difference. First operand 406 states and 517 transitions. Second operand has 23 states, 23 states have (on average 3.347826086956522) internal successors, (77), 22 states have internal predecessors, (77), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:24,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:24,950 INFO L93 Difference]: Finished difference Result 1646 states and 2168 transitions. [2021-05-06 11:09:24,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-06 11:09:24,950 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.347826086956522) internal successors, (77), 22 states have internal predecessors, (77), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 401 [2021-05-06 11:09:24,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:24,955 INFO L225 Difference]: With dead ends: 1646 [2021-05-06 11:09:24,955 INFO L226 Difference]: Without dead ends: 1635 [2021-05-06 11:09:24,955 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 204.2ms TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2021-05-06 11:09:24,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1635 states. [2021-05-06 11:09:25,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1635 to 409. [2021-05-06 11:09:25,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 409 states, 403 states have (on average 1.2779156327543424) internal successors, (515), 403 states have internal predecessors, (515), 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) [2021-05-06 11:09:25,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 409 states to 409 states and 520 transitions. [2021-05-06 11:09:25,021 INFO L78 Accepts]: Start accepts. Automaton has 409 states and 520 transitions. Word has length 401 [2021-05-06 11:09:25,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:25,021 INFO L480 AbstractCegarLoop]: Abstraction has 409 states and 520 transitions. [2021-05-06 11:09:25,022 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 3.347826086956522) internal successors, (77), 22 states have internal predecessors, (77), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:25,022 INFO L276 IsEmpty]: Start isEmpty. Operand 409 states and 520 transitions. [2021-05-06 11:09:25,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 405 [2021-05-06 11:09:25,023 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:25,023 INFO L523 BasicCegarLoop]: trace histogram [100, 100, 100, 19, 19, 19, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:25,023 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2021-05-06 11:09:25,023 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:25,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:25,023 INFO L82 PathProgramCache]: Analyzing trace with hash -2143800131, now seen corresponding path program 45 times [2021-05-06 11:09:25,023 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:25,023 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2079316647] [2021-05-06 11:09:25,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:25,028 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:25,028 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:25,029 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:09:25,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:25,401 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:09:25,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:09:25,405 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:09:25,405 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:09:25,405 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2079316647] [2021-05-06 11:09:25,405 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2079316647] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:09:25,405 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:09:25,405 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-05-06 11:09:25,406 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [82763110] [2021-05-06 11:09:25,406 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-06 11:09:25,406 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:09:25,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-06 11:09:25,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:09:25,407 INFO L87 Difference]: Start difference. First operand 409 states and 520 transitions. Second operand has 24 states, 24 states have (on average 3.3333333333333335) internal successors, (80), 23 states have internal predecessors, (80), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:26,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:09:26,549 INFO L93 Difference]: Finished difference Result 1727 states and 2276 transitions. [2021-05-06 11:09:26,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-06 11:09:26,550 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.3333333333333335) internal successors, (80), 23 states have internal predecessors, (80), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 404 [2021-05-06 11:09:26,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:09:26,555 INFO L225 Difference]: With dead ends: 1727 [2021-05-06 11:09:26,556 INFO L226 Difference]: Without dead ends: 1716 [2021-05-06 11:09:26,556 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 207.0ms TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2021-05-06 11:09:26,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1716 states. [2021-05-06 11:09:26,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1716 to 412. [2021-05-06 11:09:26,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 412 states, 406 states have (on average 1.2758620689655173) internal successors, (518), 406 states have internal predecessors, (518), 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) [2021-05-06 11:09:26,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 412 states to 412 states and 523 transitions. [2021-05-06 11:09:26,626 INFO L78 Accepts]: Start accepts. Automaton has 412 states and 523 transitions. Word has length 404 [2021-05-06 11:09:26,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:09:26,626 INFO L480 AbstractCegarLoop]: Abstraction has 412 states and 523 transitions. [2021-05-06 11:09:26,626 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 3.3333333333333335) internal successors, (80), 23 states have internal predecessors, (80), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:09:26,626 INFO L276 IsEmpty]: Start isEmpty. Operand 412 states and 523 transitions. [2021-05-06 11:09:26,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 408 [2021-05-06 11:09:26,627 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:09:26,627 INFO L523 BasicCegarLoop]: trace histogram [100, 100, 100, 20, 20, 20, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:09:26,627 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2021-05-06 11:09:26,628 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:09:26,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:09:26,628 INFO L82 PathProgramCache]: Analyzing trace with hash 826966420, now seen corresponding path program 46 times [2021-05-06 11:09:26,628 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:09:26,628 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [984410046] [2021-05-06 11:09:26,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:09:26,634 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:09:26,634 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:09:26,635 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:11:49,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:11:50,527 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 123 DAG size of output: 99 [2021-05-06 11:11:50,711 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 133 DAG size of output: 108 [2021-05-06 11:11:50,905 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 144 DAG size of output: 108 [2021-05-06 11:11:51,088 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 107 [2021-05-06 11:11:51,301 WARN L205 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 111 [2021-05-06 11:11:51,521 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 144 DAG size of output: 116 [2021-05-06 11:11:51,749 WARN L205 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 142 DAG size of output: 115 [2021-05-06 11:11:51,930 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 138 DAG size of output: 111 [2021-05-06 11:11:52,122 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 145 DAG size of output: 113 [2021-05-06 11:11:52,332 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 116 [2021-05-06 11:11:52,523 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 112 [2021-05-06 11:11:52,790 WARN L205 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 163 DAG size of output: 116 [2021-05-06 11:11:53,073 WARN L205 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 175 DAG size of output: 116 [2021-05-06 11:11:53,358 WARN L205 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 160 DAG size of output: 112 [2021-05-06 11:11:53,597 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 112 [2021-05-06 11:11:53,945 WARN L205 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 181 DAG size of output: 127 [2021-05-06 11:11:54,171 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 157 DAG size of output: 103 [2021-05-06 11:11:54,395 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 154 DAG size of output: 102 [2021-05-06 11:11:54,710 WARN L205 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 123 [2021-05-06 11:11:54,940 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 99 [2021-05-06 11:11:55,166 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 157 DAG size of output: 108 [2021-05-06 11:11:55,482 WARN L205 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 117 [2021-05-06 11:11:55,766 WARN L205 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 163 DAG size of output: 104 [2021-05-06 11:11:56,009 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 169 DAG size of output: 104 [2021-05-06 11:11:56,337 WARN L205 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 193 DAG size of output: 115 [2021-05-06 11:11:56,579 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 175 DAG size of output: 98 [2021-05-06 11:11:56,881 WARN L205 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 175 DAG size of output: 98 [2021-05-06 11:11:57,220 WARN L205 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 189 DAG size of output: 106 [2021-05-06 11:11:57,516 WARN L205 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 172 DAG size of output: 94 [2021-05-06 11:11:57,794 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 95 [2021-05-06 11:11:58,089 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 102 [2021-05-06 11:11:58,355 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 88 [2021-05-06 11:11:58,627 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 88 [2021-05-06 11:11:58,944 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 172 DAG size of output: 94 [2021-05-06 11:11:59,221 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 78 [2021-05-06 11:11:59,531 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 157 DAG size of output: 81 [2021-05-06 11:11:59,851 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 178 DAG size of output: 91 [2021-05-06 11:12:00,150 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 162 DAG size of output: 78 [2021-05-06 11:12:00,407 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 154 DAG size of output: 77 [2021-05-06 11:12:00,714 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 91 [2021-05-06 11:12:01,266 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 70 [2021-05-06 11:12:01,567 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 58 [2021-05-06 11:12:03,030 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:12:03,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:12:03,040 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:12:03,041 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:12:03,041 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [984410046] [2021-05-06 11:12:03,041 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [984410046] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:12:03,041 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:12:03,041 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2021-05-06 11:12:03,041 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1356193687] [2021-05-06 11:12:03,041 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-06 11:12:03,041 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:12:03,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-06 11:12:03,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1966, Unknown=0, NotChecked=0, Total=2070 [2021-05-06 11:12:03,042 INFO L87 Difference]: Start difference. First operand 412 states and 523 transitions. Second operand has 46 states, 46 states have (on average 1.5869565217391304) internal successors, (73), 45 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:04,058 WARN L205 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 115 [2021-05-06 11:12:04,440 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 110 DAG size of output: 100 [2021-05-06 11:12:04,647 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 102 [2021-05-06 11:12:04,861 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 128 DAG size of output: 104 [2021-05-06 11:12:05,118 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 121 DAG size of output: 106 [2021-05-06 11:12:05,356 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 136 DAG size of output: 108 [2021-05-06 11:12:05,629 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 117 DAG size of output: 105 [2021-05-06 11:12:05,891 WARN L205 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 126 [2021-05-06 11:12:06,135 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 126 DAG size of output: 109 [2021-05-06 11:12:06,387 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 119 DAG size of output: 107 [2021-05-06 11:12:06,630 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 109 [2021-05-06 11:12:06,907 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 139 DAG size of output: 109 [2021-05-06 11:12:07,179 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 117 DAG size of output: 103 [2021-05-06 11:12:07,427 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 124 [2021-05-06 11:12:07,644 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 125 DAG size of output: 103 [2021-05-06 11:12:07,888 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 124 DAG size of output: 108 [2021-05-06 11:12:08,133 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 142 DAG size of output: 120 [2021-05-06 11:12:08,413 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 124 DAG size of output: 108 [2021-05-06 11:12:08,686 WARN L205 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 148 DAG size of output: 128 [2021-05-06 11:12:08,933 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 127 DAG size of output: 107 [2021-05-06 11:12:09,181 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 124 DAG size of output: 107 [2021-05-06 11:12:09,418 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 141 DAG size of output: 109 [2021-05-06 11:12:09,678 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 123 DAG size of output: 103 [2021-05-06 11:12:09,951 WARN L205 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 123 [2021-05-06 11:12:10,211 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 133 DAG size of output: 110 [2021-05-06 11:12:10,469 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 127 DAG size of output: 110 [2021-05-06 11:12:10,755 WARN L205 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 151 DAG size of output: 133 [2021-05-06 11:12:11,013 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 132 DAG size of output: 111 [2021-05-06 11:12:11,275 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 127 DAG size of output: 109 [2021-05-06 11:12:11,520 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 116 [2021-05-06 11:12:11,964 WARN L205 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 117 [2021-05-06 11:12:12,313 WARN L205 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 119 [2021-05-06 11:12:12,689 WARN L205 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 121 [2021-05-06 11:12:13,171 WARN L205 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 166 DAG size of output: 122 [2021-05-06 11:12:13,549 WARN L205 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 181 DAG size of output: 124 [2021-05-06 11:12:13,971 WARN L205 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 163 DAG size of output: 122 [2021-05-06 11:12:14,393 WARN L205 SmtUtils]: Spent 295.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 144 [2021-05-06 11:12:14,790 WARN L205 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 123 [2021-05-06 11:12:15,196 WARN L205 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 124 [2021-05-06 11:12:15,576 WARN L205 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 184 DAG size of output: 126 [2021-05-06 11:12:16,003 WARN L205 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 184 DAG size of output: 126 [2021-05-06 11:12:16,437 WARN L205 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 163 DAG size of output: 120 [2021-05-06 11:12:16,842 WARN L205 SmtUtils]: Spent 289.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 146 [2021-05-06 11:12:17,347 WARN L205 SmtUtils]: Spent 331.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 124 [2021-05-06 11:12:17,739 WARN L205 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 169 DAG size of output: 124 [2021-05-06 11:12:18,144 WARN L205 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 187 DAG size of output: 138 [2021-05-06 11:12:18,586 WARN L205 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 169 DAG size of output: 125 [2021-05-06 11:12:19,016 WARN L205 SmtUtils]: Spent 296.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 146 [2021-05-06 11:12:19,404 WARN L205 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 172 DAG size of output: 124 [2021-05-06 11:12:19,812 WARN L205 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 169 DAG size of output: 123 [2021-05-06 11:12:20,202 WARN L205 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 125 [2021-05-06 11:12:20,628 WARN L205 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 168 DAG size of output: 120 [2021-05-06 11:12:21,103 WARN L205 SmtUtils]: Spent 314.00 ms on a formula simplification. DAG size of input: 190 DAG size of output: 142 [2021-05-06 11:12:21,547 WARN L205 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 129 [2021-05-06 11:12:21,983 WARN L205 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 129 [2021-05-06 11:12:22,452 WARN L205 SmtUtils]: Spent 332.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 151 [2021-05-06 11:12:22,879 WARN L205 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 130 [2021-05-06 11:12:23,308 WARN L205 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 127 [2021-05-06 11:12:23,693 WARN L205 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 178 DAG size of output: 134 [2021-05-06 11:12:24,231 WARN L205 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 108 [2021-05-06 11:12:24,554 WARN L205 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 157 DAG size of output: 115 [2021-05-06 11:12:24,915 WARN L205 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 117 [2021-05-06 11:12:25,363 WARN L205 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 166 DAG size of output: 118 [2021-05-06 11:12:25,721 WARN L205 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 181 DAG size of output: 120 [2021-05-06 11:12:26,121 WARN L205 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 162 DAG size of output: 118 [2021-05-06 11:12:26,527 WARN L205 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 140 [2021-05-06 11:12:26,894 WARN L205 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 119 [2021-05-06 11:12:27,268 WARN L205 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 120 [2021-05-06 11:12:27,641 WARN L205 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 122 [2021-05-06 11:12:28,056 WARN L205 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 184 DAG size of output: 122 [2021-05-06 11:12:28,475 WARN L205 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 162 DAG size of output: 116 [2021-05-06 11:12:28,864 WARN L205 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 142 [2021-05-06 11:12:29,218 WARN L205 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 120 [2021-05-06 11:12:29,599 WARN L205 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 169 DAG size of output: 120 [2021-05-06 11:12:29,990 WARN L205 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 187 DAG size of output: 134 [2021-05-06 11:12:30,398 WARN L205 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 168 DAG size of output: 121 [2021-05-06 11:12:30,807 WARN L205 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 142 [2021-05-06 11:12:31,164 WARN L205 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 120 [2021-05-06 11:12:31,538 WARN L205 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 169 DAG size of output: 119 [2021-05-06 11:12:31,892 WARN L205 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 186 DAG size of output: 121 [2021-05-06 11:12:32,279 WARN L205 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 168 DAG size of output: 116 [2021-05-06 11:12:32,724 WARN L205 SmtUtils]: Spent 296.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 138 [2021-05-06 11:12:33,141 WARN L205 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 178 DAG size of output: 125 [2021-05-06 11:12:33,550 WARN L205 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 171 DAG size of output: 125 [2021-05-06 11:12:33,993 WARN L205 SmtUtils]: Spent 312.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 147 [2021-05-06 11:12:34,393 WARN L205 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 126 [2021-05-06 11:12:34,803 WARN L205 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 172 DAG size of output: 123 [2021-05-06 11:12:35,178 WARN L205 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 130 [2021-05-06 11:12:35,566 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 126 DAG size of output: 102 [2021-05-06 11:12:35,783 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 118 DAG size of output: 113 [2021-05-06 11:12:35,990 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 106 [2021-05-06 11:12:36,208 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 112 [2021-05-06 11:12:36,474 WARN L205 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 133 [2021-05-06 11:12:36,690 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 124 DAG size of output: 107 [2021-05-06 11:12:36,879 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 117 DAG size of output: 105 [2021-05-06 11:12:37,090 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 138 DAG size of output: 107 [2021-05-06 11:12:37,328 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 136 DAG size of output: 116 [2021-05-06 11:12:37,524 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 110 [2021-05-06 11:12:37,749 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 141 DAG size of output: 122 [2021-05-06 11:12:37,939 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 123 DAG size of output: 101 [2021-05-06 11:12:38,138 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 106 [2021-05-06 11:12:38,353 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 118 [2021-05-06 11:12:38,553 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 106 [2021-05-06 11:12:38,800 WARN L205 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 126 [2021-05-06 11:12:39,004 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 125 DAG size of output: 105 [2021-05-06 11:12:39,202 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 105 [2021-05-06 11:12:39,412 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 139 DAG size of output: 107 [2021-05-06 11:12:39,609 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 121 DAG size of output: 101 [2021-05-06 11:12:39,862 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 144 DAG size of output: 121 [2021-05-06 11:12:40,086 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 131 DAG size of output: 108 [2021-05-06 11:12:40,291 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 125 DAG size of output: 108 [2021-05-06 11:12:40,548 WARN L205 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 131 [2021-05-06 11:12:40,773 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 130 DAG size of output: 109 [2021-05-06 11:12:40,977 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 125 DAG size of output: 107 [2021-05-06 11:12:41,196 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 132 DAG size of output: 114 [2021-05-06 11:12:42,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:12:42,367 INFO L93 Difference]: Finished difference Result 1518 states and 1946 transitions. [2021-05-06 11:12:42,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2021-05-06 11:12:42,367 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.5869565217391304) internal successors, (73), 45 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 407 [2021-05-06 11:12:42,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:12:42,370 INFO L225 Difference]: With dead ends: 1518 [2021-05-06 11:12:42,370 INFO L226 Difference]: Without dead ends: 1165 [2021-05-06 11:12:42,372 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 5 SyntacticMatches, 148 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6783 ImplicationChecksByTransitivity, 41210.1ms TimeCoverageRelationStatistics Valid=1033, Invalid=24727, Unknown=0, NotChecked=0, Total=25760 [2021-05-06 11:12:42,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1165 states. [2021-05-06 11:12:42,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1165 to 875. [2021-05-06 11:12:42,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 875 states, 869 states have (on average 1.3014959723820483) internal successors, (1131), 869 states have internal predecessors, (1131), 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) [2021-05-06 11:12:42,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 875 states to 875 states and 1136 transitions. [2021-05-06 11:12:42,588 INFO L78 Accepts]: Start accepts. Automaton has 875 states and 1136 transitions. Word has length 407 [2021-05-06 11:12:42,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:12:42,589 INFO L480 AbstractCegarLoop]: Abstraction has 875 states and 1136 transitions. [2021-05-06 11:12:42,589 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 1.5869565217391304) internal successors, (73), 45 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:12:42,589 INFO L276 IsEmpty]: Start isEmpty. Operand 875 states and 1136 transitions. [2021-05-06 11:12:42,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 408 [2021-05-06 11:12:42,590 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:12:42,591 INFO L523 BasicCegarLoop]: trace histogram [100, 100, 99, 20, 20, 20, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:12:42,591 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2021-05-06 11:12:42,591 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:12:42,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:12:42,591 INFO L82 PathProgramCache]: Analyzing trace with hash 75299478, now seen corresponding path program 1 times [2021-05-06 11:12:42,591 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:12:42,591 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1599354107] [2021-05-06 11:12:42,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:12:42,596 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:12:42,596 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:12:42,597 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:16:31,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:32,930 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 67 [2021-05-06 11:16:33,079 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 67 [2021-05-06 11:16:33,235 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 69 [2021-05-06 11:16:33,385 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 73 [2021-05-06 11:16:33,549 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 68 [2021-05-06 11:16:37,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:16:37,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:16:37,112 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:16:37,113 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:16:37,113 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1599354107] [2021-05-06 11:16:37,113 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1599354107] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:16:37,113 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:16:37,113 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2021-05-06 11:16:37,113 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444068735] [2021-05-06 11:16:37,113 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-06 11:16:37,113 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:16:37,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-06 11:16:37,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=730, Unknown=0, NotChecked=0, Total=812 [2021-05-06 11:16:37,114 INFO L87 Difference]: Start difference. First operand 875 states and 1136 transitions. Second operand has 29 states, 29 states have (on average 3.0) internal successors, (87), 28 states have internal predecessors, (87), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:38,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:16:38,857 INFO L93 Difference]: Finished difference Result 1682 states and 2185 transitions. [2021-05-06 11:16:38,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-06 11:16:38,858 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 3.0) internal successors, (87), 28 states have internal predecessors, (87), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 407 [2021-05-06 11:16:38,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:16:38,860 INFO L225 Difference]: With dead ends: 1682 [2021-05-06 11:16:38,860 INFO L226 Difference]: Without dead ends: 875 [2021-05-06 11:16:38,861 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 21 SyntacticMatches, 164 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 401 ImplicationChecksByTransitivity, 3884.7ms TimeCoverageRelationStatistics Valid=124, Invalid=1136, Unknown=0, NotChecked=0, Total=1260 [2021-05-06 11:16:38,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 875 states. [2021-05-06 11:16:39,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 875 to 875. [2021-05-06 11:16:39,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 875 states, 869 states have (on average 1.284234752589183) internal successors, (1116), 869 states have internal predecessors, (1116), 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) [2021-05-06 11:16:39,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 875 states to 875 states and 1121 transitions. [2021-05-06 11:16:39,102 INFO L78 Accepts]: Start accepts. Automaton has 875 states and 1121 transitions. Word has length 407 [2021-05-06 11:16:39,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:16:39,102 INFO L480 AbstractCegarLoop]: Abstraction has 875 states and 1121 transitions. [2021-05-06 11:16:39,102 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 3.0) internal successors, (87), 28 states have internal predecessors, (87), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:16:39,102 INFO L276 IsEmpty]: Start isEmpty. Operand 875 states and 1121 transitions. [2021-05-06 11:16:39,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 408 [2021-05-06 11:16:39,104 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:16:39,104 INFO L523 BasicCegarLoop]: trace histogram [100, 100, 94, 20, 20, 20, 6, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:16:39,104 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2021-05-06 11:16:39,104 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:16:39,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:16:39,104 INFO L82 PathProgramCache]: Analyzing trace with hash 1717275928, now seen corresponding path program 2 times [2021-05-06 11:16:39,104 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:16:39,104 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [829729967] [2021-05-06 11:16:39,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:16:39,110 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:16:39,110 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:16:39,110 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:19:47,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:48,548 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 91 [2021-05-06 11:19:48,712 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 126 DAG size of output: 91 [2021-05-06 11:19:48,860 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 129 DAG size of output: 92 [2021-05-06 11:19:49,028 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 126 DAG size of output: 96 [2021-05-06 11:19:49,212 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 123 DAG size of output: 90 [2021-05-06 11:19:49,339 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 116 DAG size of output: 83 [2021-05-06 11:19:49,474 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 123 DAG size of output: 85 [2021-05-06 11:19:49,614 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 142 DAG size of output: 97 [2021-05-06 11:19:49,758 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 128 DAG size of output: 93 [2021-05-06 11:19:49,926 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 141 DAG size of output: 97 [2021-05-06 11:19:50,116 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 151 DAG size of output: 106 [2021-05-06 11:19:50,281 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 136 DAG size of output: 93 [2021-05-06 11:19:50,444 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 87 [2021-05-06 11:19:50,651 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 150 DAG size of output: 95 [2021-05-06 11:19:50,825 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 135 DAG size of output: 93 [2021-05-06 11:19:50,994 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 131 DAG size of output: 94 [2021-05-06 11:19:51,171 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 141 DAG size of output: 86 [2021-05-06 11:19:51,539 WARN L205 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 95 [2021-05-06 11:19:51,744 WARN L205 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 83 [2021-05-06 11:19:51,959 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 141 DAG size of output: 91 [2021-05-06 11:19:52,160 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 93 [2021-05-06 11:19:52,343 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 138 DAG size of output: 81 [2021-05-06 11:19:52,525 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 136 DAG size of output: 75 [2021-05-06 11:19:52,743 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 85 [2021-05-06 11:19:53,119 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 75 [2021-05-06 11:19:53,337 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 151 DAG size of output: 85 [2021-05-06 11:19:53,724 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 131 DAG size of output: 71 [2021-05-06 11:19:53,939 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 133 DAG size of output: 81 [2021-05-06 11:19:54,527 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 141 DAG size of output: 82 [2021-05-06 11:19:55,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:19:55,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:19:55,853 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:19:55,853 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:19:55,854 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [829729967] [2021-05-06 11:19:55,854 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [829729967] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:19:55,854 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:19:55,854 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2021-05-06 11:19:55,854 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [185356399] [2021-05-06 11:19:55,854 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-06 11:19:55,854 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:19:55,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-06 11:19:55,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=1610, Unknown=0, NotChecked=0, Total=1722 [2021-05-06 11:19:55,854 INFO L87 Difference]: Start difference. First operand 875 states and 1121 transitions. Second operand has 42 states, 41 states have (on average 1.7317073170731707) internal successors, (71), 40 states have internal predecessors, (71), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:19:56,885 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 110 DAG size of output: 89 [2021-05-06 11:19:57,091 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 110 DAG size of output: 91 [2021-05-06 11:19:57,281 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 126 DAG size of output: 93 [2021-05-06 11:19:57,509 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 93 [2021-05-06 11:19:57,701 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 121 DAG size of output: 95 [2021-05-06 11:19:57,905 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 109 DAG size of output: 91 [2021-05-06 11:19:58,286 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 120 DAG size of output: 90 [2021-05-06 11:19:58,507 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 92 [2021-05-06 11:19:58,709 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 132 DAG size of output: 94 [2021-05-06 11:19:59,086 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 118 DAG size of output: 90 [2021-05-06 11:19:59,290 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 105 DAG size of output: 92 [2021-05-06 11:19:59,477 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 94 [2021-05-06 11:19:59,689 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 105 DAG size of output: 92 [2021-05-06 11:19:59,881 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 121 DAG size of output: 94 [2021-05-06 11:20:00,089 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 91 [2021-05-06 11:20:00,296 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 125 DAG size of output: 107 [2021-05-06 11:20:00,662 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 108 DAG size of output: 93 [2021-05-06 11:20:00,878 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 118 DAG size of output: 101 [2021-05-06 11:20:01,249 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 92 [2021-05-06 11:20:01,479 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 124 DAG size of output: 94 [2021-05-06 11:20:01,738 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 96 [2021-05-06 11:20:02,041 WARN L205 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 99 [2021-05-06 11:20:02,328 WARN L205 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 108 [2021-05-06 11:20:02,644 WARN L205 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 100 [2021-05-06 11:20:02,928 WARN L205 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 154 DAG size of output: 99 [2021-05-06 11:20:03,229 WARN L205 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 142 DAG size of output: 98 [2021-05-06 11:20:03,523 WARN L205 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 136 DAG size of output: 96 [2021-05-06 11:20:03,794 WARN L205 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 96 [2021-05-06 11:20:04,100 WARN L205 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 99 [2021-05-06 11:20:04,402 WARN L205 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 101 [2021-05-06 11:20:04,723 WARN L205 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 135 DAG size of output: 95 [2021-05-06 11:20:04,998 WARN L205 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 151 DAG size of output: 97 [2021-05-06 11:20:05,301 WARN L205 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 138 DAG size of output: 99 [2021-05-06 11:20:05,579 WARN L205 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 101 [2021-05-06 11:20:05,899 WARN L205 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 138 DAG size of output: 99 [2021-05-06 11:20:06,188 WARN L205 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 154 DAG size of output: 100 [2021-05-06 11:20:06,493 WARN L205 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 98 [2021-05-06 11:20:06,805 WARN L205 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 114 [2021-05-06 11:20:07,452 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 92 [2021-05-06 11:20:07,662 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 124 DAG size of output: 94 [2021-05-06 11:20:07,933 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 96 [2021-05-06 11:20:08,207 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 98 [2021-05-06 11:20:08,464 WARN L205 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 100 [2021-05-06 11:20:08,741 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 100 [2021-05-06 11:20:09,015 WARN L205 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 154 DAG size of output: 99 [2021-05-06 11:20:09,291 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 142 DAG size of output: 98 [2021-05-06 11:20:09,559 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 136 DAG size of output: 96 [2021-05-06 11:20:09,809 WARN L205 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 96 [2021-05-06 11:20:10,094 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 99 [2021-05-06 11:20:10,362 WARN L205 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 101 [2021-05-06 11:20:10,641 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 135 DAG size of output: 95 [2021-05-06 11:20:10,891 WARN L205 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 151 DAG size of output: 97 [2021-05-06 11:20:11,168 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 138 DAG size of output: 99 [2021-05-06 11:20:11,430 WARN L205 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 101 [2021-05-06 11:20:11,722 WARN L205 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 138 DAG size of output: 99 [2021-05-06 11:20:11,991 WARN L205 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 154 DAG size of output: 100 [2021-05-06 11:20:12,274 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 98 [2021-05-06 11:20:12,572 WARN L205 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 114 [2021-05-06 11:20:13,390 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 120 DAG size of output: 91 [2021-05-06 11:20:13,713 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 115 DAG size of output: 93 [2021-05-06 11:20:14,174 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 88 [2021-05-06 11:20:14,336 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 90 [2021-05-06 11:20:14,515 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 126 DAG size of output: 92 [2021-05-06 11:20:14,828 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 112 DAG size of output: 88 [2021-05-06 11:20:15,154 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 116 DAG size of output: 92 [2021-05-06 11:20:15,487 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 115 DAG size of output: 92 [2021-05-06 11:20:15,822 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 119 DAG size of output: 105 [2021-05-06 11:20:16,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:20:16,952 INFO L93 Difference]: Finished difference Result 2460 states and 3160 transitions. [2021-05-06 11:20:16,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2021-05-06 11:20:16,953 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 41 states have (on average 1.7317073170731707) internal successors, (71), 40 states have internal predecessors, (71), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 407 [2021-05-06 11:20:16,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:20:16,956 INFO L225 Difference]: With dead ends: 2460 [2021-05-06 11:20:16,956 INFO L226 Difference]: Without dead ends: 1713 [2021-05-06 11:20:16,958 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 3 SyntacticMatches, 120 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4313 ImplicationChecksByTransitivity, 22516.0ms TimeCoverageRelationStatistics Valid=1006, Invalid=15506, Unknown=0, NotChecked=0, Total=16512 [2021-05-06 11:20:16,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1713 states. [2021-05-06 11:20:17,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1713 to 1594. [2021-05-06 11:20:17,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1594 states, 1588 states have (on average 1.2934508816120907) internal successors, (2054), 1588 states have internal predecessors, (2054), 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) [2021-05-06 11:20:17,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1594 states to 1594 states and 2059 transitions. [2021-05-06 11:20:17,431 INFO L78 Accepts]: Start accepts. Automaton has 1594 states and 2059 transitions. Word has length 407 [2021-05-06 11:20:17,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:20:17,431 INFO L480 AbstractCegarLoop]: Abstraction has 1594 states and 2059 transitions. [2021-05-06 11:20:17,431 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 41 states have (on average 1.7317073170731707) internal successors, (71), 40 states have internal predecessors, (71), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:20:17,431 INFO L276 IsEmpty]: Start isEmpty. Operand 1594 states and 2059 transitions. [2021-05-06 11:20:17,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 408 [2021-05-06 11:20:17,433 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:20:17,433 INFO L523 BasicCegarLoop]: trace histogram [100, 100, 94, 20, 20, 20, 6, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:20:17,434 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2021-05-06 11:20:17,434 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:20:17,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:20:17,434 INFO L82 PathProgramCache]: Analyzing trace with hash -776412204, now seen corresponding path program 3 times [2021-05-06 11:20:17,434 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:20:17,434 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1513050107] [2021-05-06 11:20:17,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:20:17,440 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:20:17,440 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-06 11:20:17,440 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation