/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loops/heavy-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-7d8eed3 [2020-11-07 06:35:02,297 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-07 06:35:02,300 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-07 06:35:02,337 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-07 06:35:02,338 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-07 06:35:02,339 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-07 06:35:02,341 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-07 06:35:02,343 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-07 06:35:02,345 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-07 06:35:02,346 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-07 06:35:02,348 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-07 06:35:02,349 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-07 06:35:02,349 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-07 06:35:02,351 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-07 06:35:02,352 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-07 06:35:02,353 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-07 06:35:02,354 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-07 06:35:02,355 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-07 06:35:02,357 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-07 06:35:02,360 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-07 06:35:02,361 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-07 06:35:02,363 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-07 06:35:02,364 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-07 06:35:02,365 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-07 06:35:02,368 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-11-07 06:35:02,398 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-07 06:35:02,401 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-07 06:35:02,402 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-07 06:35:02,404 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-11-07 06:35:02,422 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-07 06:35:02,422 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-07 06:35:02,426 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-07 06:35:02,426 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-07 06:35:02,426 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-07 06:35:02,427 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-07 06:35:02,427 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-07 06:35:02,428 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-07 06:35:02,428 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-07 06:35:02,428 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-07 06:35:02,429 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-07 06:35:02,430 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-07 06:35:02,430 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-07 06:35:02,430 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-07 06:35:02,430 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-07 06:35:02,430 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-11-07 06:35:02,431 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-07 06:35:02,431 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-07 06:35:02,431 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-07 06:35:02,431 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-07 06:35:02,431 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-11-07 06:35:02,432 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-07 06:35:02,432 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-11-07 06:35:02,820 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-07 06:35:02,848 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-07 06:35:02,851 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-07 06:35:02,852 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-07 06:35:02,853 INFO L275 PluginConnector]: CDTParser initialized [2020-11-07 06:35:02,854 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-2.c [2020-11-07 06:35:02,952 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/43d4f3155/da6b7341e1984b4e9af9e3e0a471b9ec/FLAG9878c0c71 [2020-11-07 06:35:03,605 INFO L306 CDTParser]: Found 1 translation units. [2020-11-07 06:35:03,605 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/heavy-2.c [2020-11-07 06:35:03,613 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/43d4f3155/da6b7341e1984b4e9af9e3e0a471b9ec/FLAG9878c0c71 [2020-11-07 06:35:03,955 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/43d4f3155/da6b7341e1984b4e9af9e3e0a471b9ec [2020-11-07 06:35:03,958 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-07 06:35:03,970 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-11-07 06:35:03,981 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-07 06:35:03,981 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-07 06:35:03,985 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-07 06:35:03,986 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 06:35:03" (1/1) ... [2020-11-07 06:35:03,991 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@24e39eee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:35:03, skipping insertion in model container [2020-11-07 06:35:03,991 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 06:35:03" (1/1) ... [2020-11-07 06:35:04,000 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-07 06:35:04,017 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-07 06:35:04,175 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-07 06:35:04,238 INFO L203 MainTranslator]: Completed pre-run [2020-11-07 06:35:04,257 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-07 06:35:04,364 INFO L208 MainTranslator]: Completed translation [2020-11-07 06:35:04,365 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:35:04 WrapperNode [2020-11-07 06:35:04,365 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-07 06:35:04,367 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-07 06:35:04,367 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-07 06:35:04,367 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-07 06:35:04,380 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:35:04" (1/1) ... [2020-11-07 06:35:04,380 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:35:04" (1/1) ... [2020-11-07 06:35:04,388 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:35:04" (1/1) ... [2020-11-07 06:35:04,388 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:35:04" (1/1) ... [2020-11-07 06:35:04,397 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:35:04" (1/1) ... [2020-11-07 06:35:04,404 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:35:04" (1/1) ... [2020-11-07 06:35:04,405 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:35:04" (1/1) ... [2020-11-07 06:35:04,408 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-07 06:35:04,409 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-07 06:35:04,409 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-07 06:35:04,409 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-07 06:35:04,410 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:35:04" (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 [2020-11-07 06:35:04,496 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-11-07 06:35:04,496 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-07 06:35:04,496 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-11-07 06:35:04,497 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-11-07 06:35:04,497 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-11-07 06:35:04,497 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-11-07 06:35:04,497 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-11-07 06:35:04,497 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-07 06:35:04,498 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-11-07 06:35:04,498 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-07 06:35:04,498 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-07 06:35:04,498 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-11-07 06:35:04,498 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-07 06:35:04,499 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2020-11-07 06:35:04,499 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-07 06:35:04,499 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-07 06:35:04,840 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-07 06:35:04,840 INFO L298 CfgBuilder]: Removed 3 assume(true) statements. [2020-11-07 06:35:04,842 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 06:35:04 BoogieIcfgContainer [2020-11-07 06:35:04,842 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-07 06:35:04,845 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-07 06:35:04,845 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-07 06:35:04,849 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-07 06:35:04,850 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 06:35:03" (1/3) ... [2020-11-07 06:35:04,851 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75ebd9f9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 06:35:04, skipping insertion in model container [2020-11-07 06:35:04,851 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:35:04" (2/3) ... [2020-11-07 06:35:04,852 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75ebd9f9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 06:35:04, skipping insertion in model container [2020-11-07 06:35:04,852 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 06:35:04" (3/3) ... [2020-11-07 06:35:04,854 INFO L111 eAbstractionObserver]: Analyzing ICFG heavy-2.c [2020-11-07 06:35:04,874 INFO L179 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-11-07 06:35:04,878 INFO L191 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-07 06:35:04,893 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-07 06:35:04,920 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-07 06:35:04,921 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-07 06:35:04,921 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-11-07 06:35:04,921 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-07 06:35:04,921 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-07 06:35:04,921 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-07 06:35:04,922 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-07 06:35:04,922 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-07 06:35:04,941 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states. [2020-11-07 06:35:04,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-11-07 06:35:04,951 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:04,952 INFO L422 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] [2020-11-07 06:35:04,953 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:04,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:04,960 INFO L82 PathProgramCache]: Analyzing trace with hash 1977025665, now seen corresponding path program 1 times [2020-11-07 06:35:04,980 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:04,981 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1335031292] [2020-11-07 06:35:04,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:05,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:05,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:05,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:05,340 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:05,341 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1335031292] [2020-11-07 06:35:05,343 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-07 06:35:05,343 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-07 06:35:05,346 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747757098] [2020-11-07 06:35:05,353 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-07 06:35:05,354 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:05,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-07 06:35:05,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-07 06:35:05,385 INFO L87 Difference]: Start difference. First operand 56 states. Second operand 3 states. [2020-11-07 06:35:05,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:05,638 INFO L93 Difference]: Finished difference Result 107 states and 128 transitions. [2020-11-07 06:35:05,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-07 06:35:05,641 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-11-07 06:35:05,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:05,652 INFO L225 Difference]: With dead ends: 107 [2020-11-07 06:35:05,652 INFO L226 Difference]: Without dead ends: 61 [2020-11-07 06:35:05,656 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-07 06:35:05,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-11-07 06:35:05,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 45. [2020-11-07 06:35:05,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-11-07 06:35:05,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2020-11-07 06:35:05,715 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 26 [2020-11-07 06:35:05,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:05,716 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2020-11-07 06:35:05,716 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-07 06:35:05,716 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2020-11-07 06:35:05,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-11-07 06:35:05,718 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:05,718 INFO L422 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] [2020-11-07 06:35:05,718 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-07 06:35:05,719 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:05,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:05,720 INFO L82 PathProgramCache]: Analyzing trace with hash 1975744652, now seen corresponding path program 1 times [2020-11-07 06:35:05,720 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:05,721 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [587573326] [2020-11-07 06:35:05,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:05,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:05,890 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:05,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:05,939 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:05,940 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [587573326] [2020-11-07 06:35:05,941 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-07 06:35:05,942 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-11-07 06:35:05,942 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590255375] [2020-11-07 06:35:05,945 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-07 06:35:05,946 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:05,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-07 06:35:05,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-07 06:35:05,947 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand 4 states. [2020-11-07 06:35:06,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:06,314 INFO L93 Difference]: Finished difference Result 94 states and 103 transitions. [2020-11-07 06:35:06,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-07 06:35:06,315 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 26 [2020-11-07 06:35:06,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:06,317 INFO L225 Difference]: With dead ends: 94 [2020-11-07 06:35:06,317 INFO L226 Difference]: Without dead ends: 90 [2020-11-07 06:35:06,318 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-11-07 06:35:06,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-11-07 06:35:06,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 46. [2020-11-07 06:35:06,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-11-07 06:35:06,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-11-07 06:35:06,331 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 26 [2020-11-07 06:35:06,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:06,332 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-11-07 06:35:06,332 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-07 06:35:06,332 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-11-07 06:35:06,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-11-07 06:35:06,333 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:06,333 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:06,334 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-07 06:35:06,334 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:06,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:06,335 INFO L82 PathProgramCache]: Analyzing trace with hash -1044572084, now seen corresponding path program 1 times [2020-11-07 06:35:06,335 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:06,335 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1446519985] [2020-11-07 06:35:06,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:06,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:06,426 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:06,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:06,445 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:06,445 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1446519985] [2020-11-07 06:35:06,446 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-07 06:35:06,446 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-11-07 06:35:06,446 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [814792563] [2020-11-07 06:35:06,447 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-07 06:35:06,447 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:06,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-07 06:35:06,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-07 06:35:06,448 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 4 states. [2020-11-07 06:35:06,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:06,687 INFO L93 Difference]: Finished difference Result 106 states and 117 transitions. [2020-11-07 06:35:06,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-07 06:35:06,687 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 32 [2020-11-07 06:35:06,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:06,689 INFO L225 Difference]: With dead ends: 106 [2020-11-07 06:35:06,690 INFO L226 Difference]: Without dead ends: 83 [2020-11-07 06:35:06,691 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-11-07 06:35:06,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-11-07 06:35:06,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 47. [2020-11-07 06:35:06,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-11-07 06:35:06,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2020-11-07 06:35:06,703 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 32 [2020-11-07 06:35:06,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:06,704 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2020-11-07 06:35:06,704 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-07 06:35:06,704 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2020-11-07 06:35:06,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-11-07 06:35:06,705 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:06,705 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:06,706 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-11-07 06:35:06,706 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:06,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:06,707 INFO L82 PathProgramCache]: Analyzing trace with hash 2007761789, now seen corresponding path program 1 times [2020-11-07 06:35:06,707 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:06,707 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [844947688] [2020-11-07 06:35:06,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:06,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:06,795 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:06,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:06,812 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:06,812 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [844947688] [2020-11-07 06:35:06,813 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-07 06:35:06,813 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-11-07 06:35:06,813 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418581950] [2020-11-07 06:35:06,814 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-07 06:35:06,814 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:06,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-07 06:35:06,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-07 06:35:06,815 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand 4 states. [2020-11-07 06:35:07,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:07,011 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-11-07 06:35:07,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-07 06:35:07,011 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 38 [2020-11-07 06:35:07,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:07,013 INFO L225 Difference]: With dead ends: 86 [2020-11-07 06:35:07,013 INFO L226 Difference]: Without dead ends: 62 [2020-11-07 06:35:07,014 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-11-07 06:35:07,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-11-07 06:35:07,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 48. [2020-11-07 06:35:07,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-11-07 06:35:07,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-11-07 06:35:07,024 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 38 [2020-11-07 06:35:07,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:07,024 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-11-07 06:35:07,025 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-07 06:35:07,025 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-11-07 06:35:07,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-11-07 06:35:07,026 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:07,026 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:07,027 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-11-07 06:35:07,027 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:07,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:07,028 INFO L82 PathProgramCache]: Analyzing trace with hash 1905643360, now seen corresponding path program 1 times [2020-11-07 06:35:07,028 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:07,028 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1449289971] [2020-11-07 06:35:07,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:07,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:07,215 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:07,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:07,236 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:07,237 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1449289971] [2020-11-07 06:35:07,240 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:07,240 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-11-07 06:35:07,240 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345982129] [2020-11-07 06:35:07,241 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-07 06:35:07,242 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:07,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-07 06:35:07,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-11-07 06:35:07,252 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 6 states. [2020-11-07 06:35:07,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:07,483 INFO L93 Difference]: Finished difference Result 96 states and 101 transitions. [2020-11-07 06:35:07,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-07 06:35:07,484 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 47 [2020-11-07 06:35:07,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:07,485 INFO L225 Difference]: With dead ends: 96 [2020-11-07 06:35:07,486 INFO L226 Difference]: Without dead ends: 71 [2020-11-07 06:35:07,487 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2020-11-07 06:35:07,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-11-07 06:35:07,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 57. [2020-11-07 06:35:07,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-11-07 06:35:07,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2020-11-07 06:35:07,500 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 47 [2020-11-07 06:35:07,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:07,501 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2020-11-07 06:35:07,501 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-07 06:35:07,501 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2020-11-07 06:35:07,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-11-07 06:35:07,503 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:07,503 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:07,504 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-11-07 06:35:07,504 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:07,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:07,505 INFO L82 PathProgramCache]: Analyzing trace with hash 1738519261, now seen corresponding path program 2 times [2020-11-07 06:35:07,505 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:07,505 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [707287667] [2020-11-07 06:35:07,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:07,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:07,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:07,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:07,690 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:07,691 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [707287667] [2020-11-07 06:35:07,691 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:07,691 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-11-07 06:35:07,692 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132173839] [2020-11-07 06:35:07,692 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-07 06:35:07,692 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:07,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-07 06:35:07,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-11-07 06:35:07,694 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand 8 states. [2020-11-07 06:35:08,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:08,003 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-11-07 06:35:08,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-07 06:35:08,004 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 56 [2020-11-07 06:35:08,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:08,005 INFO L225 Difference]: With dead ends: 114 [2020-11-07 06:35:08,005 INFO L226 Difference]: Without dead ends: 80 [2020-11-07 06:35:08,006 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2020-11-07 06:35:08,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-11-07 06:35:08,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 66. [2020-11-07 06:35:08,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-11-07 06:35:08,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-11-07 06:35:08,019 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 56 [2020-11-07 06:35:08,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:08,020 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-11-07 06:35:08,020 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-07 06:35:08,020 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-11-07 06:35:08,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-11-07 06:35:08,022 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:08,022 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:08,022 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-11-07 06:35:08,022 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:08,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:08,023 INFO L82 PathProgramCache]: Analyzing trace with hash -1830720512, now seen corresponding path program 3 times [2020-11-07 06:35:08,023 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:08,023 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1895779003] [2020-11-07 06:35:08,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:08,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:08,277 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:08,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:08,296 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:08,297 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1895779003] [2020-11-07 06:35:08,298 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:08,298 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-11-07 06:35:08,298 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [365705044] [2020-11-07 06:35:08,300 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-07 06:35:08,300 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:08,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-07 06:35:08,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2020-11-07 06:35:08,302 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 10 states. [2020-11-07 06:35:08,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:08,673 INFO L93 Difference]: Finished difference Result 132 states and 137 transitions. [2020-11-07 06:35:08,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-11-07 06:35:08,673 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 65 [2020-11-07 06:35:08,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:08,675 INFO L225 Difference]: With dead ends: 132 [2020-11-07 06:35:08,675 INFO L226 Difference]: Without dead ends: 89 [2020-11-07 06:35:08,676 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-11-07 06:35:08,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-11-07 06:35:08,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 75. [2020-11-07 06:35:08,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-11-07 06:35:08,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 77 transitions. [2020-11-07 06:35:08,688 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 77 transitions. Word has length 65 [2020-11-07 06:35:08,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:08,688 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 77 transitions. [2020-11-07 06:35:08,689 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-07 06:35:08,689 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 77 transitions. [2020-11-07 06:35:08,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-11-07 06:35:08,690 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:08,690 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:08,690 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-11-07 06:35:08,691 INFO L429 AbstractCegarLoop]: === Iteration 8 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:08,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:08,691 INFO L82 PathProgramCache]: Analyzing trace with hash -108377539, now seen corresponding path program 4 times [2020-11-07 06:35:08,692 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:08,692 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [8014542] [2020-11-07 06:35:08,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:08,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:08,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:08,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:08,923 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 2 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:08,923 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [8014542] [2020-11-07 06:35:08,924 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:08,924 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-11-07 06:35:08,924 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079684556] [2020-11-07 06:35:08,925 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-11-07 06:35:08,925 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:08,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-11-07 06:35:08,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2020-11-07 06:35:08,926 INFO L87 Difference]: Start difference. First operand 75 states and 77 transitions. Second operand 12 states. [2020-11-07 06:35:09,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:09,395 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2020-11-07 06:35:09,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-11-07 06:35:09,395 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 74 [2020-11-07 06:35:09,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:09,397 INFO L225 Difference]: With dead ends: 150 [2020-11-07 06:35:09,397 INFO L226 Difference]: Without dead ends: 98 [2020-11-07 06:35:09,398 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=70, Invalid=350, Unknown=0, NotChecked=0, Total=420 [2020-11-07 06:35:09,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-11-07 06:35:09,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 84. [2020-11-07 06:35:09,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-11-07 06:35:09,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-11-07 06:35:09,410 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 74 [2020-11-07 06:35:09,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:09,410 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-11-07 06:35:09,410 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-11-07 06:35:09,410 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-11-07 06:35:09,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-11-07 06:35:09,412 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:09,412 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:09,412 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-11-07 06:35:09,412 INFO L429 AbstractCegarLoop]: === Iteration 9 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:09,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:09,413 INFO L82 PathProgramCache]: Analyzing trace with hash 1971003552, now seen corresponding path program 5 times [2020-11-07 06:35:09,413 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:09,414 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [351208983] [2020-11-07 06:35:09,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:09,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:09,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:09,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:09,710 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 2 proven. 95 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:09,710 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [351208983] [2020-11-07 06:35:09,710 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:09,710 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-11-07 06:35:09,711 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572929330] [2020-11-07 06:35:09,711 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-11-07 06:35:09,711 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:09,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-11-07 06:35:09,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=152, Unknown=0, NotChecked=0, Total=182 [2020-11-07 06:35:09,712 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 14 states. [2020-11-07 06:35:10,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:10,459 INFO L93 Difference]: Finished difference Result 168 states and 173 transitions. [2020-11-07 06:35:10,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-11-07 06:35:10,459 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 83 [2020-11-07 06:35:10,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:10,461 INFO L225 Difference]: With dead ends: 168 [2020-11-07 06:35:10,461 INFO L226 Difference]: Without dead ends: 107 [2020-11-07 06:35:10,462 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=85, Invalid=515, Unknown=0, NotChecked=0, Total=600 [2020-11-07 06:35:10,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-11-07 06:35:10,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 93. [2020-11-07 06:35:10,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-11-07 06:35:10,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2020-11-07 06:35:10,478 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 83 [2020-11-07 06:35:10,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:10,478 INFO L481 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2020-11-07 06:35:10,478 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-11-07 06:35:10,479 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2020-11-07 06:35:10,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-11-07 06:35:10,481 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:10,481 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:10,482 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-11-07 06:35:10,482 INFO L429 AbstractCegarLoop]: === Iteration 10 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:10,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:10,484 INFO L82 PathProgramCache]: Analyzing trace with hash 1149356445, now seen corresponding path program 6 times [2020-11-07 06:35:10,484 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:10,484 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1207848389] [2020-11-07 06:35:10,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:10,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:10,876 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:10,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:10,933 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 2 proven. 141 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:10,933 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1207848389] [2020-11-07 06:35:10,934 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:10,934 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-11-07 06:35:10,934 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745646212] [2020-11-07 06:35:10,937 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-11-07 06:35:10,938 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:10,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-11-07 06:35:10,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=205, Unknown=0, NotChecked=0, Total=240 [2020-11-07 06:35:10,939 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand 16 states. [2020-11-07 06:35:11,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:11,797 INFO L93 Difference]: Finished difference Result 186 states and 191 transitions. [2020-11-07 06:35:11,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-11-07 06:35:11,800 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 92 [2020-11-07 06:35:11,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:11,802 INFO L225 Difference]: With dead ends: 186 [2020-11-07 06:35:11,802 INFO L226 Difference]: Without dead ends: 116 [2020-11-07 06:35:11,803 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=100, Invalid=712, Unknown=0, NotChecked=0, Total=812 [2020-11-07 06:35:11,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-11-07 06:35:11,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 102. [2020-11-07 06:35:11,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-11-07 06:35:11,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 104 transitions. [2020-11-07 06:35:11,818 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 104 transitions. Word has length 92 [2020-11-07 06:35:11,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:11,819 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 104 transitions. [2020-11-07 06:35:11,819 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-11-07 06:35:11,819 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 104 transitions. [2020-11-07 06:35:11,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2020-11-07 06:35:11,820 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:11,821 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:11,821 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-11-07 06:35:11,821 INFO L429 AbstractCegarLoop]: === Iteration 11 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:11,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:11,822 INFO L82 PathProgramCache]: Analyzing trace with hash -1693651648, now seen corresponding path program 7 times [2020-11-07 06:35:11,822 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:11,822 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [813995259] [2020-11-07 06:35:11,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:11,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:12,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:12,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:12,228 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 2 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:12,228 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [813995259] [2020-11-07 06:35:12,229 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:12,229 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-11-07 06:35:12,229 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534001165] [2020-11-07 06:35:12,230 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-11-07 06:35:12,230 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:12,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-11-07 06:35:12,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=266, Unknown=0, NotChecked=0, Total=306 [2020-11-07 06:35:12,233 INFO L87 Difference]: Start difference. First operand 102 states and 104 transitions. Second operand 18 states. [2020-11-07 06:35:13,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:13,173 INFO L93 Difference]: Finished difference Result 204 states and 209 transitions. [2020-11-07 06:35:13,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-11-07 06:35:13,174 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 101 [2020-11-07 06:35:13,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:13,175 INFO L225 Difference]: With dead ends: 204 [2020-11-07 06:35:13,175 INFO L226 Difference]: Without dead ends: 125 [2020-11-07 06:35:13,178 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=115, Invalid=941, Unknown=0, NotChecked=0, Total=1056 [2020-11-07 06:35:13,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2020-11-07 06:35:13,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 111. [2020-11-07 06:35:13,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-11-07 06:35:13,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 113 transitions. [2020-11-07 06:35:13,210 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 113 transitions. Word has length 101 [2020-11-07 06:35:13,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:13,211 INFO L481 AbstractCegarLoop]: Abstraction has 111 states and 113 transitions. [2020-11-07 06:35:13,211 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-11-07 06:35:13,211 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 113 transitions. [2020-11-07 06:35:13,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-11-07 06:35:13,213 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:13,213 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:13,213 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-11-07 06:35:13,213 INFO L429 AbstractCegarLoop]: === Iteration 12 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:13,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:13,214 INFO L82 PathProgramCache]: Analyzing trace with hash 102510845, now seen corresponding path program 8 times [2020-11-07 06:35:13,214 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:13,214 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [34422031] [2020-11-07 06:35:13,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:13,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:13,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:13,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:13,650 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 2 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:13,651 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [34422031] [2020-11-07 06:35:13,651 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:13,651 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-11-07 06:35:13,651 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703517078] [2020-11-07 06:35:13,652 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-11-07 06:35:13,652 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:13,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-11-07 06:35:13,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=335, Unknown=0, NotChecked=0, Total=380 [2020-11-07 06:35:13,654 INFO L87 Difference]: Start difference. First operand 111 states and 113 transitions. Second operand 20 states. [2020-11-07 06:35:14,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:14,677 INFO L93 Difference]: Finished difference Result 222 states and 227 transitions. [2020-11-07 06:35:14,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-11-07 06:35:14,681 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 110 [2020-11-07 06:35:14,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:14,684 INFO L225 Difference]: With dead ends: 222 [2020-11-07 06:35:14,684 INFO L226 Difference]: Without dead ends: 134 [2020-11-07 06:35:14,685 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=130, Invalid=1202, Unknown=0, NotChecked=0, Total=1332 [2020-11-07 06:35:14,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2020-11-07 06:35:14,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 120. [2020-11-07 06:35:14,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-11-07 06:35:14,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 122 transitions. [2020-11-07 06:35:14,710 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 122 transitions. Word has length 110 [2020-11-07 06:35:14,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:14,712 INFO L481 AbstractCegarLoop]: Abstraction has 120 states and 122 transitions. [2020-11-07 06:35:14,712 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-11-07 06:35:14,712 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 122 transitions. [2020-11-07 06:35:14,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2020-11-07 06:35:14,719 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:14,719 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:14,719 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-11-07 06:35:14,719 INFO L429 AbstractCegarLoop]: === Iteration 13 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:14,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:14,720 INFO L82 PathProgramCache]: Analyzing trace with hash 784388576, now seen corresponding path program 9 times [2020-11-07 06:35:14,720 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:14,725 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [998867289] [2020-11-07 06:35:14,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:14,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:15,332 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:15,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:15,389 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 2 proven. 333 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:15,393 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [998867289] [2020-11-07 06:35:15,393 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:15,393 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-11-07 06:35:15,394 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532533988] [2020-11-07 06:35:15,395 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-11-07 06:35:15,395 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:15,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-11-07 06:35:15,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=412, Unknown=0, NotChecked=0, Total=462 [2020-11-07 06:35:15,401 INFO L87 Difference]: Start difference. First operand 120 states and 122 transitions. Second operand 22 states. [2020-11-07 06:35:16,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:16,665 INFO L93 Difference]: Finished difference Result 240 states and 245 transitions. [2020-11-07 06:35:16,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-11-07 06:35:16,665 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 119 [2020-11-07 06:35:16,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:16,667 INFO L225 Difference]: With dead ends: 240 [2020-11-07 06:35:16,667 INFO L226 Difference]: Without dead ends: 143 [2020-11-07 06:35:16,669 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=145, Invalid=1495, Unknown=0, NotChecked=0, Total=1640 [2020-11-07 06:35:16,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2020-11-07 06:35:16,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 129. [2020-11-07 06:35:16,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2020-11-07 06:35:16,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 131 transitions. [2020-11-07 06:35:16,681 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 131 transitions. Word has length 119 [2020-11-07 06:35:16,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:16,681 INFO L481 AbstractCegarLoop]: Abstraction has 129 states and 131 transitions. [2020-11-07 06:35:16,681 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-11-07 06:35:16,681 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 131 transitions. [2020-11-07 06:35:16,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2020-11-07 06:35:16,683 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:16,683 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:16,683 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-11-07 06:35:16,683 INFO L429 AbstractCegarLoop]: === Iteration 14 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:16,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:16,684 INFO L82 PathProgramCache]: Analyzing trace with hash 40861789, now seen corresponding path program 10 times [2020-11-07 06:35:16,684 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:16,684 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [481649430] [2020-11-07 06:35:16,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:16,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:17,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:17,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:17,355 INFO L134 CoverageAnalysis]: Checked inductivity of 417 backedges. 2 proven. 415 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:17,355 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [481649430] [2020-11-07 06:35:17,356 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:17,356 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-11-07 06:35:17,356 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [403778825] [2020-11-07 06:35:17,357 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-11-07 06:35:17,357 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:17,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-11-07 06:35:17,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=497, Unknown=0, NotChecked=0, Total=552 [2020-11-07 06:35:17,359 INFO L87 Difference]: Start difference. First operand 129 states and 131 transitions. Second operand 24 states. [2020-11-07 06:35:18,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:18,803 INFO L93 Difference]: Finished difference Result 258 states and 263 transitions. [2020-11-07 06:35:18,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-11-07 06:35:18,804 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 128 [2020-11-07 06:35:18,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:18,806 INFO L225 Difference]: With dead ends: 258 [2020-11-07 06:35:18,806 INFO L226 Difference]: Without dead ends: 152 [2020-11-07 06:35:18,808 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=160, Invalid=1820, Unknown=0, NotChecked=0, Total=1980 [2020-11-07 06:35:18,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2020-11-07 06:35:18,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 138. [2020-11-07 06:35:18,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2020-11-07 06:35:18,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 140 transitions. [2020-11-07 06:35:18,820 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 140 transitions. Word has length 128 [2020-11-07 06:35:18,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:18,820 INFO L481 AbstractCegarLoop]: Abstraction has 138 states and 140 transitions. [2020-11-07 06:35:18,821 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-11-07 06:35:18,821 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 140 transitions. [2020-11-07 06:35:18,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2020-11-07 06:35:18,822 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:18,822 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:18,822 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-11-07 06:35:18,823 INFO L429 AbstractCegarLoop]: === Iteration 15 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:18,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:18,823 INFO L82 PathProgramCache]: Analyzing trace with hash -1522479488, now seen corresponding path program 11 times [2020-11-07 06:35:18,823 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:18,824 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1644496274] [2020-11-07 06:35:18,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:18,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:19,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:19,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:19,473 INFO L134 CoverageAnalysis]: Checked inductivity of 508 backedges. 2 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:19,473 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1644496274] [2020-11-07 06:35:19,473 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:19,473 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-11-07 06:35:19,473 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [191187774] [2020-11-07 06:35:19,474 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-11-07 06:35:19,474 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:19,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-11-07 06:35:19,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=590, Unknown=0, NotChecked=0, Total=650 [2020-11-07 06:35:19,475 INFO L87 Difference]: Start difference. First operand 138 states and 140 transitions. Second operand 26 states. [2020-11-07 06:35:21,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:21,184 INFO L93 Difference]: Finished difference Result 276 states and 281 transitions. [2020-11-07 06:35:21,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-11-07 06:35:21,184 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 137 [2020-11-07 06:35:21,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:21,186 INFO L225 Difference]: With dead ends: 276 [2020-11-07 06:35:21,186 INFO L226 Difference]: Without dead ends: 161 [2020-11-07 06:35:21,189 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 254 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=175, Invalid=2177, Unknown=0, NotChecked=0, Total=2352 [2020-11-07 06:35:21,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2020-11-07 06:35:21,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 147. [2020-11-07 06:35:21,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2020-11-07 06:35:21,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 149 transitions. [2020-11-07 06:35:21,202 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 149 transitions. Word has length 137 [2020-11-07 06:35:21,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:21,203 INFO L481 AbstractCegarLoop]: Abstraction has 147 states and 149 transitions. [2020-11-07 06:35:21,203 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-11-07 06:35:21,203 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 149 transitions. [2020-11-07 06:35:21,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2020-11-07 06:35:21,204 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:21,205 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:21,205 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-11-07 06:35:21,206 INFO L429 AbstractCegarLoop]: === Iteration 16 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:21,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:21,207 INFO L82 PathProgramCache]: Analyzing trace with hash 1678882749, now seen corresponding path program 12 times [2020-11-07 06:35:21,207 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:21,209 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [343928781] [2020-11-07 06:35:21,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:21,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:21,881 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:21,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:21,936 INFO L134 CoverageAnalysis]: Checked inductivity of 608 backedges. 2 proven. 606 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:21,937 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [343928781] [2020-11-07 06:35:21,940 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:21,941 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-11-07 06:35:21,941 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712633688] [2020-11-07 06:35:21,941 INFO L461 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-11-07 06:35:21,942 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:21,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-11-07 06:35:21,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=691, Unknown=0, NotChecked=0, Total=756 [2020-11-07 06:35:21,943 INFO L87 Difference]: Start difference. First operand 147 states and 149 transitions. Second operand 28 states. [2020-11-07 06:35:23,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:23,800 INFO L93 Difference]: Finished difference Result 294 states and 299 transitions. [2020-11-07 06:35:23,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-11-07 06:35:23,805 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 146 [2020-11-07 06:35:23,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:23,807 INFO L225 Difference]: With dead ends: 294 [2020-11-07 06:35:23,807 INFO L226 Difference]: Without dead ends: 170 [2020-11-07 06:35:23,809 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 301 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=190, Invalid=2566, Unknown=0, NotChecked=0, Total=2756 [2020-11-07 06:35:23,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2020-11-07 06:35:23,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 156. [2020-11-07 06:35:23,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2020-11-07 06:35:23,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 158 transitions. [2020-11-07 06:35:23,821 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 158 transitions. Word has length 146 [2020-11-07 06:35:23,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:23,822 INFO L481 AbstractCegarLoop]: Abstraction has 156 states and 158 transitions. [2020-11-07 06:35:23,822 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-11-07 06:35:23,822 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 158 transitions. [2020-11-07 06:35:23,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2020-11-07 06:35:23,823 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:23,824 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:23,824 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-11-07 06:35:23,824 INFO L429 AbstractCegarLoop]: === Iteration 17 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:23,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:23,825 INFO L82 PathProgramCache]: Analyzing trace with hash 1555489568, now seen corresponding path program 13 times [2020-11-07 06:35:23,825 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:23,825 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [294108736] [2020-11-07 06:35:23,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:23,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:24,591 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:24,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:24,639 INFO L134 CoverageAnalysis]: Checked inductivity of 717 backedges. 2 proven. 715 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:24,639 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [294108736] [2020-11-07 06:35:24,639 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:24,640 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-11-07 06:35:24,640 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167139967] [2020-11-07 06:35:24,640 INFO L461 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-11-07 06:35:24,640 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:24,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-11-07 06:35:24,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=800, Unknown=0, NotChecked=0, Total=870 [2020-11-07 06:35:24,642 INFO L87 Difference]: Start difference. First operand 156 states and 158 transitions. Second operand 30 states. [2020-11-07 06:35:26,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:26,972 INFO L93 Difference]: Finished difference Result 312 states and 317 transitions. [2020-11-07 06:35:26,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-11-07 06:35:26,976 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 155 [2020-11-07 06:35:26,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:26,978 INFO L225 Difference]: With dead ends: 312 [2020-11-07 06:35:26,978 INFO L226 Difference]: Without dead ends: 179 [2020-11-07 06:35:26,980 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=205, Invalid=2987, Unknown=0, NotChecked=0, Total=3192 [2020-11-07 06:35:26,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2020-11-07 06:35:26,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 165. [2020-11-07 06:35:26,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2020-11-07 06:35:26,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 167 transitions. [2020-11-07 06:35:26,996 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 167 transitions. Word has length 155 [2020-11-07 06:35:26,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:26,996 INFO L481 AbstractCegarLoop]: Abstraction has 165 states and 167 transitions. [2020-11-07 06:35:26,996 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-11-07 06:35:26,996 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 167 transitions. [2020-11-07 06:35:26,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2020-11-07 06:35:26,998 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:26,999 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:26,999 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-11-07 06:35:26,999 INFO L429 AbstractCegarLoop]: === Iteration 18 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:26,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:27,000 INFO L82 PathProgramCache]: Analyzing trace with hash 471389981, now seen corresponding path program 14 times [2020-11-07 06:35:27,000 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:27,000 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1811518603] [2020-11-07 06:35:27,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:27,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:27,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:27,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:27,993 INFO L134 CoverageAnalysis]: Checked inductivity of 835 backedges. 2 proven. 833 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:27,994 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1811518603] [2020-11-07 06:35:27,994 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:27,994 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-11-07 06:35:27,994 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367049986] [2020-11-07 06:35:27,995 INFO L461 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-11-07 06:35:27,995 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:27,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-11-07 06:35:27,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=917, Unknown=0, NotChecked=0, Total=992 [2020-11-07 06:35:27,996 INFO L87 Difference]: Start difference. First operand 165 states and 167 transitions. Second operand 32 states. [2020-11-07 06:35:30,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:30,582 INFO L93 Difference]: Finished difference Result 330 states and 335 transitions. [2020-11-07 06:35:30,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-11-07 06:35:30,585 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 164 [2020-11-07 06:35:30,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:30,589 INFO L225 Difference]: With dead ends: 330 [2020-11-07 06:35:30,589 INFO L226 Difference]: Without dead ends: 188 [2020-11-07 06:35:30,592 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 407 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=220, Invalid=3440, Unknown=0, NotChecked=0, Total=3660 [2020-11-07 06:35:30,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2020-11-07 06:35:30,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 174. [2020-11-07 06:35:30,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2020-11-07 06:35:30,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 176 transitions. [2020-11-07 06:35:30,607 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 176 transitions. Word has length 164 [2020-11-07 06:35:30,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:30,607 INFO L481 AbstractCegarLoop]: Abstraction has 174 states and 176 transitions. [2020-11-07 06:35:30,608 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-11-07 06:35:30,608 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 176 transitions. [2020-11-07 06:35:30,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2020-11-07 06:35:30,610 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:30,610 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:30,610 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-11-07 06:35:30,610 INFO L429 AbstractCegarLoop]: === Iteration 19 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:30,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:30,611 INFO L82 PathProgramCache]: Analyzing trace with hash 1020071872, now seen corresponding path program 15 times [2020-11-07 06:35:30,611 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:30,611 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1395403256] [2020-11-07 06:35:30,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:30,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:31,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:31,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:31,729 INFO L134 CoverageAnalysis]: Checked inductivity of 962 backedges. 2 proven. 960 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:31,729 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1395403256] [2020-11-07 06:35:31,729 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:31,730 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-11-07 06:35:31,730 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366329215] [2020-11-07 06:35:31,730 INFO L461 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-11-07 06:35:31,731 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:31,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-11-07 06:35:31,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=1042, Unknown=0, NotChecked=0, Total=1122 [2020-11-07 06:35:31,732 INFO L87 Difference]: Start difference. First operand 174 states and 176 transitions. Second operand 34 states. [2020-11-07 06:35:34,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:34,593 INFO L93 Difference]: Finished difference Result 348 states and 353 transitions. [2020-11-07 06:35:34,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-11-07 06:35:34,593 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 173 [2020-11-07 06:35:34,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:34,595 INFO L225 Difference]: With dead ends: 348 [2020-11-07 06:35:34,595 INFO L226 Difference]: Without dead ends: 197 [2020-11-07 06:35:34,597 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 466 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=235, Invalid=3925, Unknown=0, NotChecked=0, Total=4160 [2020-11-07 06:35:34,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2020-11-07 06:35:34,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 183. [2020-11-07 06:35:34,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2020-11-07 06:35:34,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 185 transitions. [2020-11-07 06:35:34,610 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 185 transitions. Word has length 173 [2020-11-07 06:35:34,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:34,610 INFO L481 AbstractCegarLoop]: Abstraction has 183 states and 185 transitions. [2020-11-07 06:35:34,610 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-11-07 06:35:34,611 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 185 transitions. [2020-11-07 06:35:34,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2020-11-07 06:35:34,613 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:34,613 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:34,613 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-11-07 06:35:34,613 INFO L429 AbstractCegarLoop]: === Iteration 20 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:34,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:34,614 INFO L82 PathProgramCache]: Analyzing trace with hash 1109057149, now seen corresponding path program 16 times [2020-11-07 06:35:34,614 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:34,614 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1782570855] [2020-11-07 06:35:34,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:34,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:35,721 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:35,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:35,820 INFO L134 CoverageAnalysis]: Checked inductivity of 1098 backedges. 2 proven. 1096 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:35,820 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1782570855] [2020-11-07 06:35:35,820 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:35,821 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-11-07 06:35:35,821 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779951296] [2020-11-07 06:35:35,821 INFO L461 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-11-07 06:35:35,821 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:35,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-11-07 06:35:35,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1175, Unknown=0, NotChecked=0, Total=1260 [2020-11-07 06:35:35,822 INFO L87 Difference]: Start difference. First operand 183 states and 185 transitions. Second operand 36 states. [2020-11-07 06:35:39,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:39,112 INFO L93 Difference]: Finished difference Result 366 states and 371 transitions. [2020-11-07 06:35:39,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2020-11-07 06:35:39,116 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 182 [2020-11-07 06:35:39,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:39,118 INFO L225 Difference]: With dead ends: 366 [2020-11-07 06:35:39,118 INFO L226 Difference]: Without dead ends: 206 [2020-11-07 06:35:39,121 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 529 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=250, Invalid=4442, Unknown=0, NotChecked=0, Total=4692 [2020-11-07 06:35:39,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2020-11-07 06:35:39,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 192. [2020-11-07 06:35:39,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2020-11-07 06:35:39,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 194 transitions. [2020-11-07 06:35:39,135 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 194 transitions. Word has length 182 [2020-11-07 06:35:39,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:39,136 INFO L481 AbstractCegarLoop]: Abstraction has 192 states and 194 transitions. [2020-11-07 06:35:39,136 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-11-07 06:35:39,136 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 194 transitions. [2020-11-07 06:35:39,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2020-11-07 06:35:39,139 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:39,139 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:39,139 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-11-07 06:35:39,139 INFO L429 AbstractCegarLoop]: === Iteration 21 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:39,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:39,140 INFO L82 PathProgramCache]: Analyzing trace with hash 1454199904, now seen corresponding path program 17 times [2020-11-07 06:35:39,140 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:39,140 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [993798556] [2020-11-07 06:35:39,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:39,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:40,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:40,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:40,491 INFO L134 CoverageAnalysis]: Checked inductivity of 1243 backedges. 2 proven. 1241 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:40,491 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [993798556] [2020-11-07 06:35:40,491 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:40,491 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-11-07 06:35:40,491 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693061784] [2020-11-07 06:35:40,492 INFO L461 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-11-07 06:35:40,492 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:40,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-11-07 06:35:40,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=1316, Unknown=0, NotChecked=0, Total=1406 [2020-11-07 06:35:40,493 INFO L87 Difference]: Start difference. First operand 192 states and 194 transitions. Second operand 38 states. [2020-11-07 06:35:44,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:44,087 INFO L93 Difference]: Finished difference Result 384 states and 389 transitions. [2020-11-07 06:35:44,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-11-07 06:35:44,089 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 191 [2020-11-07 06:35:44,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:44,091 INFO L225 Difference]: With dead ends: 384 [2020-11-07 06:35:44,092 INFO L226 Difference]: Without dead ends: 215 [2020-11-07 06:35:44,094 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 596 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=265, Invalid=4991, Unknown=0, NotChecked=0, Total=5256 [2020-11-07 06:35:44,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2020-11-07 06:35:44,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 201. [2020-11-07 06:35:44,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2020-11-07 06:35:44,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 203 transitions. [2020-11-07 06:35:44,113 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 203 transitions. Word has length 191 [2020-11-07 06:35:44,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:44,113 INFO L481 AbstractCegarLoop]: Abstraction has 201 states and 203 transitions. [2020-11-07 06:35:44,113 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-11-07 06:35:44,114 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 203 transitions. [2020-11-07 06:35:44,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2020-11-07 06:35:44,116 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:44,116 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:44,116 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-11-07 06:35:44,116 INFO L429 AbstractCegarLoop]: === Iteration 22 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:44,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:44,117 INFO L82 PathProgramCache]: Analyzing trace with hash 1949158877, now seen corresponding path program 18 times [2020-11-07 06:35:44,117 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:44,118 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [291010085] [2020-11-07 06:35:44,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:44,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:45,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:45,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:45,535 INFO L134 CoverageAnalysis]: Checked inductivity of 1397 backedges. 2 proven. 1395 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:45,536 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [291010085] [2020-11-07 06:35:45,536 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:45,536 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-11-07 06:35:45,536 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077778365] [2020-11-07 06:35:45,537 INFO L461 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-11-07 06:35:45,538 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:45,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-11-07 06:35:45,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1465, Unknown=0, NotChecked=0, Total=1560 [2020-11-07 06:35:45,539 INFO L87 Difference]: Start difference. First operand 201 states and 203 transitions. Second operand 40 states. [2020-11-07 06:35:49,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:49,568 INFO L93 Difference]: Finished difference Result 402 states and 407 transitions. [2020-11-07 06:35:49,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2020-11-07 06:35:49,571 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 200 [2020-11-07 06:35:49,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:49,573 INFO L225 Difference]: With dead ends: 402 [2020-11-07 06:35:49,573 INFO L226 Difference]: Without dead ends: 224 [2020-11-07 06:35:49,575 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 667 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=280, Invalid=5572, Unknown=0, NotChecked=0, Total=5852 [2020-11-07 06:35:49,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2020-11-07 06:35:49,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 210. [2020-11-07 06:35:49,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2020-11-07 06:35:49,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 212 transitions. [2020-11-07 06:35:49,593 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 212 transitions. Word has length 200 [2020-11-07 06:35:49,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:49,593 INFO L481 AbstractCegarLoop]: Abstraction has 210 states and 212 transitions. [2020-11-07 06:35:49,594 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-11-07 06:35:49,594 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 212 transitions. [2020-11-07 06:35:49,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2020-11-07 06:35:49,595 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:49,595 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:49,596 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-11-07 06:35:49,596 INFO L429 AbstractCegarLoop]: === Iteration 23 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:49,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:49,596 INFO L82 PathProgramCache]: Analyzing trace with hash -2063486720, now seen corresponding path program 19 times [2020-11-07 06:35:49,597 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:49,597 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1455833067] [2020-11-07 06:35:49,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:49,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:51,041 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:51,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:51,111 INFO L134 CoverageAnalysis]: Checked inductivity of 1560 backedges. 2 proven. 1558 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:51,112 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1455833067] [2020-11-07 06:35:51,112 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:51,112 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-11-07 06:35:51,112 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826420331] [2020-11-07 06:35:51,113 INFO L461 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-11-07 06:35:51,113 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:51,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-11-07 06:35:51,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=1622, Unknown=0, NotChecked=0, Total=1722 [2020-11-07 06:35:51,115 INFO L87 Difference]: Start difference. First operand 210 states and 212 transitions. Second operand 42 states. [2020-11-07 06:35:55,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:35:55,546 INFO L93 Difference]: Finished difference Result 420 states and 425 transitions. [2020-11-07 06:35:55,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2020-11-07 06:35:55,546 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 209 [2020-11-07 06:35:55,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:35:55,548 INFO L225 Difference]: With dead ends: 420 [2020-11-07 06:35:55,548 INFO L226 Difference]: Without dead ends: 233 [2020-11-07 06:35:55,552 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 742 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=295, Invalid=6185, Unknown=0, NotChecked=0, Total=6480 [2020-11-07 06:35:55,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2020-11-07 06:35:55,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 219. [2020-11-07 06:35:55,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 219 states. [2020-11-07 06:35:55,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 221 transitions. [2020-11-07 06:35:55,567 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 221 transitions. Word has length 209 [2020-11-07 06:35:55,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:35:55,568 INFO L481 AbstractCegarLoop]: Abstraction has 219 states and 221 transitions. [2020-11-07 06:35:55,568 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-11-07 06:35:55,568 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 221 transitions. [2020-11-07 06:35:55,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2020-11-07 06:35:55,570 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:35:55,570 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 20, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:35:55,570 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-11-07 06:35:55,570 INFO L429 AbstractCegarLoop]: === Iteration 24 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:35:55,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:35:55,571 INFO L82 PathProgramCache]: Analyzing trace with hash 921150781, now seen corresponding path program 20 times [2020-11-07 06:35:55,571 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:35:55,571 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [742246483] [2020-11-07 06:35:55,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:35:55,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:57,151 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:35:57,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:35:57,237 INFO L134 CoverageAnalysis]: Checked inductivity of 1732 backedges. 2 proven. 1730 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:35:57,237 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [742246483] [2020-11-07 06:35:57,237 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:35:57,237 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-11-07 06:35:57,237 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093489998] [2020-11-07 06:35:57,238 INFO L461 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-11-07 06:35:57,238 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:35:57,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-11-07 06:35:57,239 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1787, Unknown=0, NotChecked=0, Total=1892 [2020-11-07 06:35:57,239 INFO L87 Difference]: Start difference. First operand 219 states and 221 transitions. Second operand 44 states. [2020-11-07 06:36:01,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:36:01,977 INFO L93 Difference]: Finished difference Result 438 states and 443 transitions. [2020-11-07 06:36:01,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2020-11-07 06:36:01,983 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 218 [2020-11-07 06:36:01,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:36:01,985 INFO L225 Difference]: With dead ends: 438 [2020-11-07 06:36:01,985 INFO L226 Difference]: Without dead ends: 242 [2020-11-07 06:36:01,987 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 821 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=310, Invalid=6830, Unknown=0, NotChecked=0, Total=7140 [2020-11-07 06:36:01,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2020-11-07 06:36:02,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 228. [2020-11-07 06:36:02,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 228 states. [2020-11-07 06:36:02,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 230 transitions. [2020-11-07 06:36:02,001 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 230 transitions. Word has length 218 [2020-11-07 06:36:02,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:36:02,002 INFO L481 AbstractCegarLoop]: Abstraction has 228 states and 230 transitions. [2020-11-07 06:36:02,002 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-11-07 06:36:02,002 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 230 transitions. [2020-11-07 06:36:02,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2020-11-07 06:36:02,003 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:36:02,004 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:36:02,004 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-11-07 06:36:02,004 INFO L429 AbstractCegarLoop]: === Iteration 25 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:36:02,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:36:02,005 INFO L82 PathProgramCache]: Analyzing trace with hash 200549792, now seen corresponding path program 21 times [2020-11-07 06:36:02,005 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:36:02,005 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [244260635] [2020-11-07 06:36:02,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:36:02,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:03,647 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:36:03,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:03,753 INFO L134 CoverageAnalysis]: Checked inductivity of 1913 backedges. 2 proven. 1911 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:36:03,754 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [244260635] [2020-11-07 06:36:03,754 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:36:03,754 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-11-07 06:36:03,754 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869273161] [2020-11-07 06:36:03,754 INFO L461 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-11-07 06:36:03,755 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:36:03,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-11-07 06:36:03,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1960, Unknown=0, NotChecked=0, Total=2070 [2020-11-07 06:36:03,755 INFO L87 Difference]: Start difference. First operand 228 states and 230 transitions. Second operand 46 states. [2020-11-07 06:36:08,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:36:08,927 INFO L93 Difference]: Finished difference Result 456 states and 461 transitions. [2020-11-07 06:36:08,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2020-11-07 06:36:08,928 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 227 [2020-11-07 06:36:08,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:36:08,929 INFO L225 Difference]: With dead ends: 456 [2020-11-07 06:36:08,930 INFO L226 Difference]: Without dead ends: 251 [2020-11-07 06:36:08,931 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 904 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=325, Invalid=7507, Unknown=0, NotChecked=0, Total=7832 [2020-11-07 06:36:08,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2020-11-07 06:36:08,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 237. [2020-11-07 06:36:08,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 237 states. [2020-11-07 06:36:08,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 239 transitions. [2020-11-07 06:36:08,948 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 239 transitions. Word has length 227 [2020-11-07 06:36:08,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:36:08,948 INFO L481 AbstractCegarLoop]: Abstraction has 237 states and 239 transitions. [2020-11-07 06:36:08,948 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-11-07 06:36:08,949 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 239 transitions. [2020-11-07 06:36:08,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2020-11-07 06:36:08,950 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:36:08,950 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:36:08,950 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-11-07 06:36:08,951 INFO L429 AbstractCegarLoop]: === Iteration 26 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:36:08,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:36:08,951 INFO L82 PathProgramCache]: Analyzing trace with hash 1432249501, now seen corresponding path program 22 times [2020-11-07 06:36:08,951 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:36:08,951 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [742808000] [2020-11-07 06:36:08,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:36:08,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:10,802 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:36:10,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:10,935 INFO L134 CoverageAnalysis]: Checked inductivity of 2103 backedges. 2 proven. 2101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:36:10,935 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [742808000] [2020-11-07 06:36:10,935 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:36:10,935 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-11-07 06:36:10,935 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320263411] [2020-11-07 06:36:10,937 INFO L461 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-11-07 06:36:10,937 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:36:10,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-11-07 06:36:10,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=2141, Unknown=0, NotChecked=0, Total=2256 [2020-11-07 06:36:10,938 INFO L87 Difference]: Start difference. First operand 237 states and 239 transitions. Second operand 48 states. [2020-11-07 06:36:16,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:36:16,441 INFO L93 Difference]: Finished difference Result 474 states and 479 transitions. [2020-11-07 06:36:16,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2020-11-07 06:36:16,444 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 236 [2020-11-07 06:36:16,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:36:16,446 INFO L225 Difference]: With dead ends: 474 [2020-11-07 06:36:16,446 INFO L226 Difference]: Without dead ends: 260 [2020-11-07 06:36:16,447 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 991 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=340, Invalid=8216, Unknown=0, NotChecked=0, Total=8556 [2020-11-07 06:36:16,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2020-11-07 06:36:16,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 246. [2020-11-07 06:36:16,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 246 states. [2020-11-07 06:36:16,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 248 transitions. [2020-11-07 06:36:16,465 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 248 transitions. Word has length 236 [2020-11-07 06:36:16,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:36:16,465 INFO L481 AbstractCegarLoop]: Abstraction has 246 states and 248 transitions. [2020-11-07 06:36:16,465 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-11-07 06:36:16,465 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 248 transitions. [2020-11-07 06:36:16,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2020-11-07 06:36:16,467 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:36:16,467 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:36:16,467 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-11-07 06:36:16,467 INFO L429 AbstractCegarLoop]: === Iteration 27 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:36:16,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:36:16,472 INFO L82 PathProgramCache]: Analyzing trace with hash 959361600, now seen corresponding path program 23 times [2020-11-07 06:36:16,472 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:36:16,473 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [575845966] [2020-11-07 06:36:16,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:36:16,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:18,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:36:18,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:18,669 INFO L134 CoverageAnalysis]: Checked inductivity of 2302 backedges. 2 proven. 2300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:36:18,669 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [575845966] [2020-11-07 06:36:18,669 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:36:18,669 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-11-07 06:36:18,670 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1540701323] [2020-11-07 06:36:18,670 INFO L461 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-11-07 06:36:18,670 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:36:18,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-11-07 06:36:18,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=2330, Unknown=0, NotChecked=0, Total=2450 [2020-11-07 06:36:18,671 INFO L87 Difference]: Start difference. First operand 246 states and 248 transitions. Second operand 50 states. [2020-11-07 06:36:24,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:36:24,664 INFO L93 Difference]: Finished difference Result 492 states and 497 transitions. [2020-11-07 06:36:24,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2020-11-07 06:36:24,667 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 245 [2020-11-07 06:36:24,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:36:24,669 INFO L225 Difference]: With dead ends: 492 [2020-11-07 06:36:24,669 INFO L226 Difference]: Without dead ends: 269 [2020-11-07 06:36:24,672 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1082 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=355, Invalid=8957, Unknown=0, NotChecked=0, Total=9312 [2020-11-07 06:36:24,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2020-11-07 06:36:24,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 255. [2020-11-07 06:36:24,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 255 states. [2020-11-07 06:36:24,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 257 transitions. [2020-11-07 06:36:24,689 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 257 transitions. Word has length 245 [2020-11-07 06:36:24,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:36:24,689 INFO L481 AbstractCegarLoop]: Abstraction has 255 states and 257 transitions. [2020-11-07 06:36:24,689 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-11-07 06:36:24,689 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 257 transitions. [2020-11-07 06:36:24,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2020-11-07 06:36:24,691 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:36:24,691 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 24, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:36:24,691 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-11-07 06:36:24,691 INFO L429 AbstractCegarLoop]: === Iteration 28 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:36:24,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:36:24,692 INFO L82 PathProgramCache]: Analyzing trace with hash 1093143549, now seen corresponding path program 24 times [2020-11-07 06:36:24,692 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:36:24,692 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1762678876] [2020-11-07 06:36:24,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:36:24,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:26,834 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:36:26,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:26,942 INFO L134 CoverageAnalysis]: Checked inductivity of 2510 backedges. 2 proven. 2508 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:36:26,942 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1762678876] [2020-11-07 06:36:26,942 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:36:26,942 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2020-11-07 06:36:26,943 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647937297] [2020-11-07 06:36:26,943 INFO L461 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-11-07 06:36:26,943 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:36:26,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-11-07 06:36:26,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=2527, Unknown=0, NotChecked=0, Total=2652 [2020-11-07 06:36:26,944 INFO L87 Difference]: Start difference. First operand 255 states and 257 transitions. Second operand 52 states. [2020-11-07 06:36:33,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:36:33,507 INFO L93 Difference]: Finished difference Result 510 states and 515 transitions. [2020-11-07 06:36:33,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2020-11-07 06:36:33,511 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 254 [2020-11-07 06:36:33,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:36:33,513 INFO L225 Difference]: With dead ends: 510 [2020-11-07 06:36:33,513 INFO L226 Difference]: Without dead ends: 278 [2020-11-07 06:36:33,515 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1177 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=370, Invalid=9730, Unknown=0, NotChecked=0, Total=10100 [2020-11-07 06:36:33,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2020-11-07 06:36:33,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 264. [2020-11-07 06:36:33,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 264 states. [2020-11-07 06:36:33,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 266 transitions. [2020-11-07 06:36:33,532 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 266 transitions. Word has length 254 [2020-11-07 06:36:33,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:36:33,533 INFO L481 AbstractCegarLoop]: Abstraction has 264 states and 266 transitions. [2020-11-07 06:36:33,533 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-11-07 06:36:33,533 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 266 transitions. [2020-11-07 06:36:33,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 264 [2020-11-07 06:36:33,534 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:36:33,535 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 25, 25, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:36:33,535 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-11-07 06:36:33,535 INFO L429 AbstractCegarLoop]: === Iteration 29 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:36:33,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:36:33,537 INFO L82 PathProgramCache]: Analyzing trace with hash 64706272, now seen corresponding path program 25 times [2020-11-07 06:36:33,537 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:36:33,537 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1737103465] [2020-11-07 06:36:33,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:36:33,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:35,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:36:35,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:36,066 INFO L134 CoverageAnalysis]: Checked inductivity of 2727 backedges. 2 proven. 2725 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:36:36,066 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1737103465] [2020-11-07 06:36:36,066 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:36:36,066 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54] total 54 [2020-11-07 06:36:36,066 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [650396330] [2020-11-07 06:36:36,067 INFO L461 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-11-07 06:36:36,067 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:36:36,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-11-07 06:36:36,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=2732, Unknown=0, NotChecked=0, Total=2862 [2020-11-07 06:36:36,068 INFO L87 Difference]: Start difference. First operand 264 states and 266 transitions. Second operand 54 states. [2020-11-07 06:36:42,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:36:42,948 INFO L93 Difference]: Finished difference Result 528 states and 533 transitions. [2020-11-07 06:36:42,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2020-11-07 06:36:42,954 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 263 [2020-11-07 06:36:42,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:36:42,956 INFO L225 Difference]: With dead ends: 528 [2020-11-07 06:36:42,957 INFO L226 Difference]: Without dead ends: 287 [2020-11-07 06:36:42,958 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1276 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=385, Invalid=10535, Unknown=0, NotChecked=0, Total=10920 [2020-11-07 06:36:42,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2020-11-07 06:36:42,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 273. [2020-11-07 06:36:42,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 273 states. [2020-11-07 06:36:42,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 275 transitions. [2020-11-07 06:36:42,974 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 275 transitions. Word has length 263 [2020-11-07 06:36:42,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:36:42,975 INFO L481 AbstractCegarLoop]: Abstraction has 273 states and 275 transitions. [2020-11-07 06:36:42,975 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-11-07 06:36:42,975 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 275 transitions. [2020-11-07 06:36:42,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 273 [2020-11-07 06:36:42,976 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:36:42,977 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 26, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:36:42,977 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-11-07 06:36:42,977 INFO L429 AbstractCegarLoop]: === Iteration 30 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:36:42,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:36:42,978 INFO L82 PathProgramCache]: Analyzing trace with hash 1918540637, now seen corresponding path program 26 times [2020-11-07 06:36:42,978 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:36:42,978 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1290318436] [2020-11-07 06:36:42,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:36:43,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:45,541 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:36:45,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:45,678 INFO L134 CoverageAnalysis]: Checked inductivity of 2953 backedges. 2 proven. 2951 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:36:45,679 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1290318436] [2020-11-07 06:36:45,679 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:36:45,679 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2020-11-07 06:36:45,679 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208562014] [2020-11-07 06:36:45,679 INFO L461 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-11-07 06:36:45,680 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:36:45,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-11-07 06:36:45,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2945, Unknown=0, NotChecked=0, Total=3080 [2020-11-07 06:36:45,681 INFO L87 Difference]: Start difference. First operand 273 states and 275 transitions. Second operand 56 states. [2020-11-07 06:36:53,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:36:53,368 INFO L93 Difference]: Finished difference Result 546 states and 551 transitions. [2020-11-07 06:36:53,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2020-11-07 06:36:53,369 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 272 [2020-11-07 06:36:53,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:36:53,371 INFO L225 Difference]: With dead ends: 546 [2020-11-07 06:36:53,371 INFO L226 Difference]: Without dead ends: 296 [2020-11-07 06:36:53,372 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1379 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=400, Invalid=11372, Unknown=0, NotChecked=0, Total=11772 [2020-11-07 06:36:53,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2020-11-07 06:36:53,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 282. [2020-11-07 06:36:53,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 282 states. [2020-11-07 06:36:53,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 284 transitions. [2020-11-07 06:36:53,389 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 284 transitions. Word has length 272 [2020-11-07 06:36:53,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:36:53,390 INFO L481 AbstractCegarLoop]: Abstraction has 282 states and 284 transitions. [2020-11-07 06:36:53,390 INFO L482 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-11-07 06:36:53,390 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 284 transitions. [2020-11-07 06:36:53,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 282 [2020-11-07 06:36:53,391 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:36:53,392 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 27, 27, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:36:53,392 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-11-07 06:36:53,392 INFO L429 AbstractCegarLoop]: === Iteration 31 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:36:53,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:36:53,393 INFO L82 PathProgramCache]: Analyzing trace with hash -1398533248, now seen corresponding path program 27 times [2020-11-07 06:36:53,393 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:36:53,393 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1053106994] [2020-11-07 06:36:53,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:36:53,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:56,195 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:36:56,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:36:56,321 INFO L134 CoverageAnalysis]: Checked inductivity of 3188 backedges. 2 proven. 3186 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:36:56,321 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1053106994] [2020-11-07 06:36:56,321 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:36:56,322 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2020-11-07 06:36:56,322 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394397326] [2020-11-07 06:36:56,322 INFO L461 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-11-07 06:36:56,322 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:36:56,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-11-07 06:36:56,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=3166, Unknown=0, NotChecked=0, Total=3306 [2020-11-07 06:36:56,323 INFO L87 Difference]: Start difference. First operand 282 states and 284 transitions. Second operand 58 states. [2020-11-07 06:37:04,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:37:04,386 INFO L93 Difference]: Finished difference Result 564 states and 569 transitions. [2020-11-07 06:37:04,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2020-11-07 06:37:04,386 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 281 [2020-11-07 06:37:04,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:37:04,388 INFO L225 Difference]: With dead ends: 564 [2020-11-07 06:37:04,388 INFO L226 Difference]: Without dead ends: 305 [2020-11-07 06:37:04,390 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1486 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=415, Invalid=12241, Unknown=0, NotChecked=0, Total=12656 [2020-11-07 06:37:04,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2020-11-07 06:37:04,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 291. [2020-11-07 06:37:04,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 291 states. [2020-11-07 06:37:04,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 293 transitions. [2020-11-07 06:37:04,408 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 293 transitions. Word has length 281 [2020-11-07 06:37:04,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:37:04,408 INFO L481 AbstractCegarLoop]: Abstraction has 291 states and 293 transitions. [2020-11-07 06:37:04,408 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-11-07 06:37:04,408 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 293 transitions. [2020-11-07 06:37:04,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 291 [2020-11-07 06:37:04,410 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:37:04,410 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 28, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:37:04,410 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-11-07 06:37:04,411 INFO L429 AbstractCegarLoop]: === Iteration 32 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:37:04,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:37:04,411 INFO L82 PathProgramCache]: Analyzing trace with hash -947121475, now seen corresponding path program 28 times [2020-11-07 06:37:04,411 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:37:04,411 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [943080848] [2020-11-07 06:37:04,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:37:04,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:37:07,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:37:07,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:37:07,562 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 2 proven. 3430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:37:07,563 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [943080848] [2020-11-07 06:37:07,563 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:37:07,563 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60] total 60 [2020-11-07 06:37:07,563 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743226580] [2020-11-07 06:37:07,564 INFO L461 AbstractCegarLoop]: Interpolant automaton has 60 states [2020-11-07 06:37:07,564 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:37:07,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2020-11-07 06:37:07,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=3395, Unknown=0, NotChecked=0, Total=3540 [2020-11-07 06:37:07,565 INFO L87 Difference]: Start difference. First operand 291 states and 293 transitions. Second operand 60 states. [2020-11-07 06:37:16,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:37:16,194 INFO L93 Difference]: Finished difference Result 582 states and 587 transitions. [2020-11-07 06:37:16,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2020-11-07 06:37:16,195 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 290 [2020-11-07 06:37:16,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:37:16,196 INFO L225 Difference]: With dead ends: 582 [2020-11-07 06:37:16,196 INFO L226 Difference]: Without dead ends: 314 [2020-11-07 06:37:16,198 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1597 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=430, Invalid=13142, Unknown=0, NotChecked=0, Total=13572 [2020-11-07 06:37:16,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2020-11-07 06:37:16,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 300. [2020-11-07 06:37:16,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 300 states. [2020-11-07 06:37:16,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 302 transitions. [2020-11-07 06:37:16,215 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 302 transitions. Word has length 290 [2020-11-07 06:37:16,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:37:16,216 INFO L481 AbstractCegarLoop]: Abstraction has 300 states and 302 transitions. [2020-11-07 06:37:16,216 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2020-11-07 06:37:16,216 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 302 transitions. [2020-11-07 06:37:16,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-11-07 06:37:16,218 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:37:16,218 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 29, 29, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:37:16,218 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-11-07 06:37:16,218 INFO L429 AbstractCegarLoop]: === Iteration 33 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:37:16,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:37:16,219 INFO L82 PathProgramCache]: Analyzing trace with hash 1572005920, now seen corresponding path program 29 times [2020-11-07 06:37:16,219 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:37:16,219 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1664602871] [2020-11-07 06:37:16,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:37:16,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:37:19,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:37:19,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:37:19,680 INFO L134 CoverageAnalysis]: Checked inductivity of 3685 backedges. 2 proven. 3683 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:37:19,680 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1664602871] [2020-11-07 06:37:19,680 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:37:19,680 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62] total 62 [2020-11-07 06:37:19,680 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1513779567] [2020-11-07 06:37:19,681 INFO L461 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-11-07 06:37:19,681 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:37:19,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-11-07 06:37:19,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=3632, Unknown=0, NotChecked=0, Total=3782 [2020-11-07 06:37:19,682 INFO L87 Difference]: Start difference. First operand 300 states and 302 transitions. Second operand 62 states. [2020-11-07 06:37:28,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:37:28,816 INFO L93 Difference]: Finished difference Result 600 states and 605 transitions. [2020-11-07 06:37:28,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2020-11-07 06:37:28,817 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 299 [2020-11-07 06:37:28,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:37:28,819 INFO L225 Difference]: With dead ends: 600 [2020-11-07 06:37:28,819 INFO L226 Difference]: Without dead ends: 323 [2020-11-07 06:37:28,822 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1712 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=445, Invalid=14075, Unknown=0, NotChecked=0, Total=14520 [2020-11-07 06:37:28,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2020-11-07 06:37:28,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 309. [2020-11-07 06:37:28,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 309 states. [2020-11-07 06:37:28,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 311 transitions. [2020-11-07 06:37:28,839 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 311 transitions. Word has length 299 [2020-11-07 06:37:28,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:37:28,839 INFO L481 AbstractCegarLoop]: Abstraction has 309 states and 311 transitions. [2020-11-07 06:37:28,839 INFO L482 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-11-07 06:37:28,839 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 311 transitions. [2020-11-07 06:37:28,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 309 [2020-11-07 06:37:28,841 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:37:28,841 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 30, 30, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:37:28,842 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-11-07 06:37:28,842 INFO L429 AbstractCegarLoop]: === Iteration 34 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:37:28,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:37:28,842 INFO L82 PathProgramCache]: Analyzing trace with hash -439193059, now seen corresponding path program 30 times [2020-11-07 06:37:28,842 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:37:28,843 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [82886568] [2020-11-07 06:37:28,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:37:28,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:37:32,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:37:32,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:37:32,441 INFO L134 CoverageAnalysis]: Checked inductivity of 3947 backedges. 2 proven. 3945 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:37:32,442 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [82886568] [2020-11-07 06:37:32,442 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:37:32,442 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64] total 64 [2020-11-07 06:37:32,442 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105007838] [2020-11-07 06:37:32,442 INFO L461 AbstractCegarLoop]: Interpolant automaton has 64 states [2020-11-07 06:37:32,443 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:37:32,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2020-11-07 06:37:32,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=3877, Unknown=0, NotChecked=0, Total=4032 [2020-11-07 06:37:32,443 INFO L87 Difference]: Start difference. First operand 309 states and 311 transitions. Second operand 64 states. [2020-11-07 06:37:42,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:37:42,244 INFO L93 Difference]: Finished difference Result 618 states and 623 transitions. [2020-11-07 06:37:42,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2020-11-07 06:37:42,246 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 308 [2020-11-07 06:37:42,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:37:42,247 INFO L225 Difference]: With dead ends: 618 [2020-11-07 06:37:42,248 INFO L226 Difference]: Without dead ends: 332 [2020-11-07 06:37:42,249 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1831 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=460, Invalid=15040, Unknown=0, NotChecked=0, Total=15500 [2020-11-07 06:37:42,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 332 states. [2020-11-07 06:37:42,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 332 to 318. [2020-11-07 06:37:42,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 318 states. [2020-11-07 06:37:42,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 320 transitions. [2020-11-07 06:37:42,267 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 320 transitions. Word has length 308 [2020-11-07 06:37:42,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:37:42,268 INFO L481 AbstractCegarLoop]: Abstraction has 318 states and 320 transitions. [2020-11-07 06:37:42,268 INFO L482 AbstractCegarLoop]: Interpolant automaton has 64 states. [2020-11-07 06:37:42,268 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 320 transitions. [2020-11-07 06:37:42,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 318 [2020-11-07 06:37:42,270 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:37:42,270 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 31, 31, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:37:42,270 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-11-07 06:37:42,270 INFO L429 AbstractCegarLoop]: === Iteration 35 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:37:42,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:37:42,271 INFO L82 PathProgramCache]: Analyzing trace with hash -894315328, now seen corresponding path program 31 times [2020-11-07 06:37:42,271 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:37:42,271 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1911183460] [2020-11-07 06:37:42,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:37:42,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:37:46,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:37:46,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:37:46,228 INFO L134 CoverageAnalysis]: Checked inductivity of 4218 backedges. 2 proven. 4216 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:37:46,229 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1911183460] [2020-11-07 06:37:46,229 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:37:46,229 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66] total 66 [2020-11-07 06:37:46,229 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721812849] [2020-11-07 06:37:46,229 INFO L461 AbstractCegarLoop]: Interpolant automaton has 66 states [2020-11-07 06:37:46,229 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:37:46,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2020-11-07 06:37:46,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=4130, Unknown=0, NotChecked=0, Total=4290 [2020-11-07 06:37:46,230 INFO L87 Difference]: Start difference. First operand 318 states and 320 transitions. Second operand 66 states. [2020-11-07 06:37:56,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:37:56,513 INFO L93 Difference]: Finished difference Result 636 states and 641 transitions. [2020-11-07 06:37:56,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2020-11-07 06:37:56,514 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 317 [2020-11-07 06:37:56,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:37:56,516 INFO L225 Difference]: With dead ends: 636 [2020-11-07 06:37:56,516 INFO L226 Difference]: Without dead ends: 341 [2020-11-07 06:37:56,518 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1954 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=475, Invalid=16037, Unknown=0, NotChecked=0, Total=16512 [2020-11-07 06:37:56,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 341 states. [2020-11-07 06:37:56,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 341 to 327. [2020-11-07 06:37:56,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 327 states. [2020-11-07 06:37:56,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 329 transitions. [2020-11-07 06:37:56,537 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 329 transitions. Word has length 317 [2020-11-07 06:37:56,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:37:56,537 INFO L481 AbstractCegarLoop]: Abstraction has 327 states and 329 transitions. [2020-11-07 06:37:56,537 INFO L482 AbstractCegarLoop]: Interpolant automaton has 66 states. [2020-11-07 06:37:56,537 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 329 transitions. [2020-11-07 06:37:56,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2020-11-07 06:37:56,539 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:37:56,539 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 32, 32, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:37:56,540 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-11-07 06:37:56,540 INFO L429 AbstractCegarLoop]: === Iteration 36 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:37:56,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:37:56,540 INFO L82 PathProgramCache]: Analyzing trace with hash -1732003459, now seen corresponding path program 32 times [2020-11-07 06:37:56,540 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:37:56,541 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [483462987] [2020-11-07 06:37:56,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:37:56,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:38:00,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:38:00,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:38:00,722 INFO L134 CoverageAnalysis]: Checked inductivity of 4498 backedges. 2 proven. 4496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:38:00,722 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [483462987] [2020-11-07 06:38:00,723 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:38:00,723 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68] total 68 [2020-11-07 06:38:00,723 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348395156] [2020-11-07 06:38:00,723 INFO L461 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-11-07 06:38:00,724 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:38:00,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-11-07 06:38:00,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=4391, Unknown=0, NotChecked=0, Total=4556 [2020-11-07 06:38:00,725 INFO L87 Difference]: Start difference. First operand 327 states and 329 transitions. Second operand 68 states. [2020-11-07 06:38:12,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:38:12,005 INFO L93 Difference]: Finished difference Result 654 states and 659 transitions. [2020-11-07 06:38:12,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2020-11-07 06:38:12,006 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 326 [2020-11-07 06:38:12,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:38:12,008 INFO L225 Difference]: With dead ends: 654 [2020-11-07 06:38:12,009 INFO L226 Difference]: Without dead ends: 350 [2020-11-07 06:38:12,011 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2081 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=490, Invalid=17066, Unknown=0, NotChecked=0, Total=17556 [2020-11-07 06:38:12,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 350 states. [2020-11-07 06:38:12,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 350 to 336. [2020-11-07 06:38:12,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 336 states. [2020-11-07 06:38:12,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 338 transitions. [2020-11-07 06:38:12,030 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 338 transitions. Word has length 326 [2020-11-07 06:38:12,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:38:12,031 INFO L481 AbstractCegarLoop]: Abstraction has 336 states and 338 transitions. [2020-11-07 06:38:12,031 INFO L482 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-11-07 06:38:12,031 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 338 transitions. [2020-11-07 06:38:12,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2020-11-07 06:38:12,033 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:38:12,033 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 33, 33, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:38:12,033 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-11-07 06:38:12,033 INFO L429 AbstractCegarLoop]: === Iteration 37 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:38:12,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:38:12,034 INFO L82 PathProgramCache]: Analyzing trace with hash -792012448, now seen corresponding path program 33 times [2020-11-07 06:38:12,034 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:38:12,034 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [99438352] [2020-11-07 06:38:12,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:38:12,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:38:16,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:38:16,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:38:16,687 INFO L134 CoverageAnalysis]: Checked inductivity of 4787 backedges. 2 proven. 4785 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:38:16,687 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [99438352] [2020-11-07 06:38:16,687 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:38:16,687 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70] total 70 [2020-11-07 06:38:16,688 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1162157161] [2020-11-07 06:38:16,688 INFO L461 AbstractCegarLoop]: Interpolant automaton has 70 states [2020-11-07 06:38:16,688 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:38:16,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2020-11-07 06:38:16,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=4660, Unknown=0, NotChecked=0, Total=4830 [2020-11-07 06:38:16,689 INFO L87 Difference]: Start difference. First operand 336 states and 338 transitions. Second operand 70 states. [2020-11-07 06:38:28,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:38:28,635 INFO L93 Difference]: Finished difference Result 672 states and 677 transitions. [2020-11-07 06:38:28,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2020-11-07 06:38:28,645 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 335 [2020-11-07 06:38:28,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:38:28,647 INFO L225 Difference]: With dead ends: 672 [2020-11-07 06:38:28,647 INFO L226 Difference]: Without dead ends: 359 [2020-11-07 06:38:28,650 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2212 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=505, Invalid=18127, Unknown=0, NotChecked=0, Total=18632 [2020-11-07 06:38:28,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2020-11-07 06:38:28,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 345. [2020-11-07 06:38:28,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 345 states. [2020-11-07 06:38:28,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 345 states to 345 states and 347 transitions. [2020-11-07 06:38:28,672 INFO L78 Accepts]: Start accepts. Automaton has 345 states and 347 transitions. Word has length 335 [2020-11-07 06:38:28,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:38:28,672 INFO L481 AbstractCegarLoop]: Abstraction has 345 states and 347 transitions. [2020-11-07 06:38:28,673 INFO L482 AbstractCegarLoop]: Interpolant automaton has 70 states. [2020-11-07 06:38:28,673 INFO L276 IsEmpty]: Start isEmpty. Operand 345 states and 347 transitions. [2020-11-07 06:38:28,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2020-11-07 06:38:28,675 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:38:28,675 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 34, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:38:28,675 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-11-07 06:38:28,675 INFO L429 AbstractCegarLoop]: === Iteration 38 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:38:28,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:38:28,676 INFO L82 PathProgramCache]: Analyzing trace with hash 846588125, now seen corresponding path program 34 times [2020-11-07 06:38:28,676 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:38:28,677 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1937664140] [2020-11-07 06:38:28,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:38:28,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:38:33,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:38:33,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:38:33,692 INFO L134 CoverageAnalysis]: Checked inductivity of 5085 backedges. 2 proven. 5083 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:38:33,693 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1937664140] [2020-11-07 06:38:33,693 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:38:33,693 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72] total 72 [2020-11-07 06:38:33,693 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751685809] [2020-11-07 06:38:33,694 INFO L461 AbstractCegarLoop]: Interpolant automaton has 72 states [2020-11-07 06:38:33,694 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:38:33,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2020-11-07 06:38:33,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=4937, Unknown=0, NotChecked=0, Total=5112 [2020-11-07 06:38:33,695 INFO L87 Difference]: Start difference. First operand 345 states and 347 transitions. Second operand 72 states. [2020-11-07 06:38:46,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:38:46,804 INFO L93 Difference]: Finished difference Result 690 states and 695 transitions. [2020-11-07 06:38:46,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2020-11-07 06:38:46,805 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 344 [2020-11-07 06:38:46,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:38:46,807 INFO L225 Difference]: With dead ends: 690 [2020-11-07 06:38:46,807 INFO L226 Difference]: Without dead ends: 368 [2020-11-07 06:38:46,809 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2347 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=520, Invalid=19220, Unknown=0, NotChecked=0, Total=19740 [2020-11-07 06:38:46,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 368 states. [2020-11-07 06:38:46,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 368 to 354. [2020-11-07 06:38:46,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 354 states. [2020-11-07 06:38:46,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 354 states to 354 states and 356 transitions. [2020-11-07 06:38:46,828 INFO L78 Accepts]: Start accepts. Automaton has 354 states and 356 transitions. Word has length 344 [2020-11-07 06:38:46,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:38:46,829 INFO L481 AbstractCegarLoop]: Abstraction has 354 states and 356 transitions. [2020-11-07 06:38:46,829 INFO L482 AbstractCegarLoop]: Interpolant automaton has 72 states. [2020-11-07 06:38:46,829 INFO L276 IsEmpty]: Start isEmpty. Operand 354 states and 356 transitions. [2020-11-07 06:38:46,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 354 [2020-11-07 06:38:46,831 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:38:46,831 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 35, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:38:46,832 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-11-07 06:38:46,832 INFO L429 AbstractCegarLoop]: === Iteration 39 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:38:46,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:38:46,832 INFO L82 PathProgramCache]: Analyzing trace with hash 380106240, now seen corresponding path program 35 times [2020-11-07 06:38:46,832 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:38:46,832 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1095156771] [2020-11-07 06:38:46,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:38:46,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:38:52,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:38:52,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:38:52,361 INFO L134 CoverageAnalysis]: Checked inductivity of 5392 backedges. 2 proven. 5390 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:38:52,361 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1095156771] [2020-11-07 06:38:52,361 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:38:52,361 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74] total 74 [2020-11-07 06:38:52,361 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114110548] [2020-11-07 06:38:52,362 INFO L461 AbstractCegarLoop]: Interpolant automaton has 74 states [2020-11-07 06:38:52,362 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:38:52,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2020-11-07 06:38:52,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=5222, Unknown=0, NotChecked=0, Total=5402 [2020-11-07 06:38:52,363 INFO L87 Difference]: Start difference. First operand 354 states and 356 transitions. Second operand 74 states. [2020-11-07 06:39:06,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:39:06,856 INFO L93 Difference]: Finished difference Result 708 states and 713 transitions. [2020-11-07 06:39:06,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2020-11-07 06:39:06,857 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 353 [2020-11-07 06:39:06,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:39:06,859 INFO L225 Difference]: With dead ends: 708 [2020-11-07 06:39:06,859 INFO L226 Difference]: Without dead ends: 377 [2020-11-07 06:39:06,862 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2486 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=535, Invalid=20345, Unknown=0, NotChecked=0, Total=20880 [2020-11-07 06:39:06,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2020-11-07 06:39:06,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 363. [2020-11-07 06:39:06,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 363 states. [2020-11-07 06:39:06,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 363 states to 363 states and 365 transitions. [2020-11-07 06:39:06,881 INFO L78 Accepts]: Start accepts. Automaton has 363 states and 365 transitions. Word has length 353 [2020-11-07 06:39:06,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:39:06,882 INFO L481 AbstractCegarLoop]: Abstraction has 363 states and 365 transitions. [2020-11-07 06:39:06,882 INFO L482 AbstractCegarLoop]: Interpolant automaton has 74 states. [2020-11-07 06:39:06,882 INFO L276 IsEmpty]: Start isEmpty. Operand 363 states and 365 transitions. [2020-11-07 06:39:06,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 363 [2020-11-07 06:39:06,884 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:39:06,885 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 36, 36, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:39:06,885 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-11-07 06:39:06,885 INFO L429 AbstractCegarLoop]: === Iteration 40 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:39:06,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:39:06,885 INFO L82 PathProgramCache]: Analyzing trace with hash -343998403, now seen corresponding path program 36 times [2020-11-07 06:39:06,886 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:39:06,886 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [260598045] [2020-11-07 06:39:06,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:39:06,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:39:12,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:39:12,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:39:12,874 INFO L134 CoverageAnalysis]: Checked inductivity of 5708 backedges. 2 proven. 5706 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:39:12,875 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [260598045] [2020-11-07 06:39:12,875 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:39:12,875 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76] total 76 [2020-11-07 06:39:12,875 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574699529] [2020-11-07 06:39:12,875 INFO L461 AbstractCegarLoop]: Interpolant automaton has 76 states [2020-11-07 06:39:12,876 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:39:12,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2020-11-07 06:39:12,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=5515, Unknown=0, NotChecked=0, Total=5700 [2020-11-07 06:39:12,877 INFO L87 Difference]: Start difference. First operand 363 states and 365 transitions. Second operand 76 states. [2020-11-07 06:39:28,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:39:28,572 INFO L93 Difference]: Finished difference Result 726 states and 731 transitions. [2020-11-07 06:39:28,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2020-11-07 06:39:28,573 INFO L78 Accepts]: Start accepts. Automaton has 76 states. Word has length 362 [2020-11-07 06:39:28,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:39:28,575 INFO L225 Difference]: With dead ends: 726 [2020-11-07 06:39:28,575 INFO L226 Difference]: Without dead ends: 386 [2020-11-07 06:39:28,578 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2629 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=550, Invalid=21502, Unknown=0, NotChecked=0, Total=22052 [2020-11-07 06:39:28,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 386 states. [2020-11-07 06:39:28,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 386 to 372. [2020-11-07 06:39:28,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 372 states. [2020-11-07 06:39:28,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 372 states to 372 states and 374 transitions. [2020-11-07 06:39:28,617 INFO L78 Accepts]: Start accepts. Automaton has 372 states and 374 transitions. Word has length 362 [2020-11-07 06:39:28,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:39:28,618 INFO L481 AbstractCegarLoop]: Abstraction has 372 states and 374 transitions. [2020-11-07 06:39:28,618 INFO L482 AbstractCegarLoop]: Interpolant automaton has 76 states. [2020-11-07 06:39:28,618 INFO L276 IsEmpty]: Start isEmpty. Operand 372 states and 374 transitions. [2020-11-07 06:39:28,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 372 [2020-11-07 06:39:28,620 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:39:28,620 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 37, 37, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:39:28,621 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-11-07 06:39:28,621 INFO L429 AbstractCegarLoop]: === Iteration 41 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:39:28,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:39:28,621 INFO L82 PathProgramCache]: Analyzing trace with hash -1401738592, now seen corresponding path program 37 times [2020-11-07 06:39:28,621 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:39:28,622 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1961603610] [2020-11-07 06:39:28,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:39:28,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:39:34,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:39:34,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:39:35,088 INFO L134 CoverageAnalysis]: Checked inductivity of 6033 backedges. 2 proven. 6031 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:39:35,088 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1961603610] [2020-11-07 06:39:35,088 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:39:35,088 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78] total 78 [2020-11-07 06:39:35,088 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449128568] [2020-11-07 06:39:35,089 INFO L461 AbstractCegarLoop]: Interpolant automaton has 78 states [2020-11-07 06:39:35,089 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:39:35,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2020-11-07 06:39:35,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=5816, Unknown=0, NotChecked=0, Total=6006 [2020-11-07 06:39:35,091 INFO L87 Difference]: Start difference. First operand 372 states and 374 transitions. Second operand 78 states. [2020-11-07 06:39:52,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:39:52,411 INFO L93 Difference]: Finished difference Result 744 states and 749 transitions. [2020-11-07 06:39:52,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2020-11-07 06:39:52,412 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 371 [2020-11-07 06:39:52,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:39:52,414 INFO L225 Difference]: With dead ends: 744 [2020-11-07 06:39:52,414 INFO L226 Difference]: Without dead ends: 395 [2020-11-07 06:39:52,416 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2776 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=565, Invalid=22691, Unknown=0, NotChecked=0, Total=23256 [2020-11-07 06:39:52,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 395 states. [2020-11-07 06:39:52,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 395 to 381. [2020-11-07 06:39:52,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 381 states. [2020-11-07 06:39:52,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 381 states to 381 states and 383 transitions. [2020-11-07 06:39:52,437 INFO L78 Accepts]: Start accepts. Automaton has 381 states and 383 transitions. Word has length 371 [2020-11-07 06:39:52,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:39:52,437 INFO L481 AbstractCegarLoop]: Abstraction has 381 states and 383 transitions. [2020-11-07 06:39:52,437 INFO L482 AbstractCegarLoop]: Interpolant automaton has 78 states. [2020-11-07 06:39:52,437 INFO L276 IsEmpty]: Start isEmpty. Operand 381 states and 383 transitions. [2020-11-07 06:39:52,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 381 [2020-11-07 06:39:52,440 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:39:52,440 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:39:52,440 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-11-07 06:39:52,440 INFO L429 AbstractCegarLoop]: === Iteration 42 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:39:52,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:39:52,441 INFO L82 PathProgramCache]: Analyzing trace with hash 1123352477, now seen corresponding path program 38 times [2020-11-07 06:39:52,441 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:39:52,441 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1869013437] [2020-11-07 06:39:52,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:39:52,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:39:59,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:39:59,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:39:59,629 INFO L134 CoverageAnalysis]: Checked inductivity of 6367 backedges. 2 proven. 6365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:39:59,629 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1869013437] [2020-11-07 06:39:59,629 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:39:59,629 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80] total 80 [2020-11-07 06:39:59,629 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944270842] [2020-11-07 06:39:59,630 INFO L461 AbstractCegarLoop]: Interpolant automaton has 80 states [2020-11-07 06:39:59,630 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:39:59,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2020-11-07 06:39:59,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=6125, Unknown=0, NotChecked=0, Total=6320 [2020-11-07 06:39:59,631 INFO L87 Difference]: Start difference. First operand 381 states and 383 transitions. Second operand 80 states. [2020-11-07 06:40:19,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:40:19,238 INFO L93 Difference]: Finished difference Result 762 states and 767 transitions. [2020-11-07 06:40:19,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2020-11-07 06:40:19,239 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 380 [2020-11-07 06:40:19,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:40:19,241 INFO L225 Difference]: With dead ends: 762 [2020-11-07 06:40:19,241 INFO L226 Difference]: Without dead ends: 404 [2020-11-07 06:40:19,243 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2927 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=580, Invalid=23912, Unknown=0, NotChecked=0, Total=24492 [2020-11-07 06:40:19,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 404 states. [2020-11-07 06:40:19,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 404 to 390. [2020-11-07 06:40:19,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 390 states. [2020-11-07 06:40:19,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 390 states to 390 states and 392 transitions. [2020-11-07 06:40:19,264 INFO L78 Accepts]: Start accepts. Automaton has 390 states and 392 transitions. Word has length 380 [2020-11-07 06:40:19,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:40:19,264 INFO L481 AbstractCegarLoop]: Abstraction has 390 states and 392 transitions. [2020-11-07 06:40:19,265 INFO L482 AbstractCegarLoop]: Interpolant automaton has 80 states. [2020-11-07 06:40:19,265 INFO L276 IsEmpty]: Start isEmpty. Operand 390 states and 392 transitions. [2020-11-07 06:40:19,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2020-11-07 06:40:19,267 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:40:19,267 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 39, 39, 39, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:40:19,268 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-11-07 06:40:19,268 INFO L429 AbstractCegarLoop]: === Iteration 43 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:40:19,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:40:19,268 INFO L82 PathProgramCache]: Analyzing trace with hash -1412008128, now seen corresponding path program 39 times [2020-11-07 06:40:19,268 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:40:19,268 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1722758151] [2020-11-07 06:40:19,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:40:19,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:40:27,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:40:27,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:40:27,340 INFO L134 CoverageAnalysis]: Checked inductivity of 6710 backedges. 2 proven. 6708 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:40:27,340 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1722758151] [2020-11-07 06:40:27,340 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:40:27,341 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [82] total 82 [2020-11-07 06:40:27,341 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642311093] [2020-11-07 06:40:27,341 INFO L461 AbstractCegarLoop]: Interpolant automaton has 82 states [2020-11-07 06:40:27,342 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:40:27,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2020-11-07 06:40:27,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=6442, Unknown=0, NotChecked=0, Total=6642 [2020-11-07 06:40:27,343 INFO L87 Difference]: Start difference. First operand 390 states and 392 transitions. Second operand 82 states. [2020-11-07 06:40:49,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:40:49,701 INFO L93 Difference]: Finished difference Result 780 states and 785 transitions. [2020-11-07 06:40:49,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2020-11-07 06:40:49,702 INFO L78 Accepts]: Start accepts. Automaton has 82 states. Word has length 389 [2020-11-07 06:40:49,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:40:49,704 INFO L225 Difference]: With dead ends: 780 [2020-11-07 06:40:49,704 INFO L226 Difference]: Without dead ends: 413 [2020-11-07 06:40:49,707 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3082 ImplicationChecksByTransitivity, 15.1s TimeCoverageRelationStatistics Valid=595, Invalid=25165, Unknown=0, NotChecked=0, Total=25760 [2020-11-07 06:40:49,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 413 states. [2020-11-07 06:40:49,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 413 to 399. [2020-11-07 06:40:49,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 399 states. [2020-11-07 06:40:49,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 401 transitions. [2020-11-07 06:40:49,729 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 401 transitions. Word has length 389 [2020-11-07 06:40:49,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:40:49,729 INFO L481 AbstractCegarLoop]: Abstraction has 399 states and 401 transitions. [2020-11-07 06:40:49,729 INFO L482 AbstractCegarLoop]: Interpolant automaton has 82 states. [2020-11-07 06:40:49,729 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 401 transitions. [2020-11-07 06:40:49,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 399 [2020-11-07 06:40:49,732 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:40:49,732 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 40, 40, 40, 40, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:40:49,732 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-11-07 06:40:49,733 INFO L429 AbstractCegarLoop]: === Iteration 44 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:40:49,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:40:49,733 INFO L82 PathProgramCache]: Analyzing trace with hash 1584260861, now seen corresponding path program 40 times [2020-11-07 06:40:49,733 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:40:49,733 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [12630694] [2020-11-07 06:40:49,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:40:49,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:40:58,568 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:40:58,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:40:58,814 INFO L134 CoverageAnalysis]: Checked inductivity of 7062 backedges. 2 proven. 7060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:40:58,815 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [12630694] [2020-11-07 06:40:58,815 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:40:58,815 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [84] total 84 [2020-11-07 06:40:58,815 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827511279] [2020-11-07 06:40:58,816 INFO L461 AbstractCegarLoop]: Interpolant automaton has 84 states [2020-11-07 06:40:58,816 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:40:58,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2020-11-07 06:40:58,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=6767, Unknown=0, NotChecked=0, Total=6972 [2020-11-07 06:40:58,817 INFO L87 Difference]: Start difference. First operand 399 states and 401 transitions. Second operand 84 states. [2020-11-07 06:41:23,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:41:23,779 INFO L93 Difference]: Finished difference Result 798 states and 803 transitions. [2020-11-07 06:41:23,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 125 states. [2020-11-07 06:41:23,781 INFO L78 Accepts]: Start accepts. Automaton has 84 states. Word has length 398 [2020-11-07 06:41:23,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:41:23,783 INFO L225 Difference]: With dead ends: 798 [2020-11-07 06:41:23,783 INFO L226 Difference]: Without dead ends: 422 [2020-11-07 06:41:23,785 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3241 ImplicationChecksByTransitivity, 16.9s TimeCoverageRelationStatistics Valid=610, Invalid=26450, Unknown=0, NotChecked=0, Total=27060 [2020-11-07 06:41:23,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 422 states. [2020-11-07 06:41:23,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 422 to 408. [2020-11-07 06:41:23,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 408 states. [2020-11-07 06:41:23,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 410 transitions. [2020-11-07 06:41:23,808 INFO L78 Accepts]: Start accepts. Automaton has 408 states and 410 transitions. Word has length 398 [2020-11-07 06:41:23,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:41:23,808 INFO L481 AbstractCegarLoop]: Abstraction has 408 states and 410 transitions. [2020-11-07 06:41:23,808 INFO L482 AbstractCegarLoop]: Interpolant automaton has 84 states. [2020-11-07 06:41:23,808 INFO L276 IsEmpty]: Start isEmpty. Operand 408 states and 410 transitions. [2020-11-07 06:41:23,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 408 [2020-11-07 06:41:23,811 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:41:23,811 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 41, 41, 41, 41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:41:23,812 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-11-07 06:41:23,812 INFO L429 AbstractCegarLoop]: === Iteration 45 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:41:23,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:41:23,812 INFO L82 PathProgramCache]: Analyzing trace with hash -671360032, now seen corresponding path program 41 times [2020-11-07 06:41:23,812 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:41:23,812 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1952298489] [2020-11-07 06:41:23,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:41:23,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:41:33,615 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:41:33,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:41:33,866 INFO L134 CoverageAnalysis]: Checked inductivity of 7423 backedges. 2 proven. 7421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:41:33,866 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1952298489] [2020-11-07 06:41:33,866 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:41:33,867 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [86] total 86 [2020-11-07 06:41:33,867 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163784886] [2020-11-07 06:41:33,867 INFO L461 AbstractCegarLoop]: Interpolant automaton has 86 states [2020-11-07 06:41:33,868 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:41:33,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2020-11-07 06:41:33,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=7100, Unknown=0, NotChecked=0, Total=7310 [2020-11-07 06:41:33,869 INFO L87 Difference]: Start difference. First operand 408 states and 410 transitions. Second operand 86 states. [2020-11-07 06:42:02,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:42:02,762 INFO L93 Difference]: Finished difference Result 816 states and 821 transitions. [2020-11-07 06:42:02,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2020-11-07 06:42:02,764 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 407 [2020-11-07 06:42:02,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:42:02,767 INFO L225 Difference]: With dead ends: 816 [2020-11-07 06:42:02,767 INFO L226 Difference]: Without dead ends: 431 [2020-11-07 06:42:02,769 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3404 ImplicationChecksByTransitivity, 18.7s TimeCoverageRelationStatistics Valid=625, Invalid=27767, Unknown=0, NotChecked=0, Total=28392 [2020-11-07 06:42:02,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 431 states. [2020-11-07 06:42:02,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 431 to 417. [2020-11-07 06:42:02,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 417 states. [2020-11-07 06:42:02,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 417 states to 417 states and 419 transitions. [2020-11-07 06:42:02,802 INFO L78 Accepts]: Start accepts. Automaton has 417 states and 419 transitions. Word has length 407 [2020-11-07 06:42:02,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:42:02,802 INFO L481 AbstractCegarLoop]: Abstraction has 417 states and 419 transitions. [2020-11-07 06:42:02,802 INFO L482 AbstractCegarLoop]: Interpolant automaton has 86 states. [2020-11-07 06:42:02,802 INFO L276 IsEmpty]: Start isEmpty. Operand 417 states and 419 transitions. [2020-11-07 06:42:02,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 417 [2020-11-07 06:42:02,805 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:42:02,805 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 42, 42, 42, 42, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:42:02,805 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-11-07 06:42:02,805 INFO L429 AbstractCegarLoop]: === Iteration 46 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:42:02,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:42:02,806 INFO L82 PathProgramCache]: Analyzing trace with hash 1778366045, now seen corresponding path program 42 times [2020-11-07 06:42:02,806 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:42:02,806 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1151389408] [2020-11-07 06:42:02,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:42:02,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:42:13,431 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:42:13,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:42:13,705 INFO L134 CoverageAnalysis]: Checked inductivity of 7793 backedges. 2 proven. 7791 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:42:13,705 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1151389408] [2020-11-07 06:42:13,705 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:42:13,706 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [88] total 88 [2020-11-07 06:42:13,706 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64905622] [2020-11-07 06:42:13,706 INFO L461 AbstractCegarLoop]: Interpolant automaton has 88 states [2020-11-07 06:42:13,706 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:42:13,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2020-11-07 06:42:13,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=7441, Unknown=0, NotChecked=0, Total=7656 [2020-11-07 06:42:13,707 INFO L87 Difference]: Start difference. First operand 417 states and 419 transitions. Second operand 88 states. [2020-11-07 06:42:46,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:42:46,376 INFO L93 Difference]: Finished difference Result 834 states and 839 transitions. [2020-11-07 06:42:46,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 131 states. [2020-11-07 06:42:46,378 INFO L78 Accepts]: Start accepts. Automaton has 88 states. Word has length 416 [2020-11-07 06:42:46,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:42:46,380 INFO L225 Difference]: With dead ends: 834 [2020-11-07 06:42:46,380 INFO L226 Difference]: Without dead ends: 440 [2020-11-07 06:42:46,383 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3571 ImplicationChecksByTransitivity, 20.6s TimeCoverageRelationStatistics Valid=640, Invalid=29116, Unknown=0, NotChecked=0, Total=29756 [2020-11-07 06:42:46,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 440 states. [2020-11-07 06:42:46,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 440 to 426. [2020-11-07 06:42:46,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 426 states. [2020-11-07 06:42:46,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 426 states to 426 states and 428 transitions. [2020-11-07 06:42:46,401 INFO L78 Accepts]: Start accepts. Automaton has 426 states and 428 transitions. Word has length 416 [2020-11-07 06:42:46,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:42:46,402 INFO L481 AbstractCegarLoop]: Abstraction has 426 states and 428 transitions. [2020-11-07 06:42:46,413 INFO L482 AbstractCegarLoop]: Interpolant automaton has 88 states. [2020-11-07 06:42:46,413 INFO L276 IsEmpty]: Start isEmpty. Operand 426 states and 428 transitions. [2020-11-07 06:42:46,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 426 [2020-11-07 06:42:46,416 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:42:46,416 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 43, 43, 43, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:42:46,416 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-11-07 06:42:46,417 INFO L429 AbstractCegarLoop]: === Iteration 47 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:42:46,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:42:46,417 INFO L82 PathProgramCache]: Analyzing trace with hash 1032673408, now seen corresponding path program 43 times [2020-11-07 06:42:46,417 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:42:46,418 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1252915118] [2020-11-07 06:42:46,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:42:46,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:42:58,247 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:42:58,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:42:58,532 INFO L134 CoverageAnalysis]: Checked inductivity of 8172 backedges. 2 proven. 8170 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:42:58,532 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1252915118] [2020-11-07 06:42:58,532 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:42:58,532 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [90] total 90 [2020-11-07 06:42:58,532 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127884546] [2020-11-07 06:42:58,533 INFO L461 AbstractCegarLoop]: Interpolant automaton has 90 states [2020-11-07 06:42:58,533 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:42:58,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2020-11-07 06:42:58,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=7790, Unknown=0, NotChecked=0, Total=8010 [2020-11-07 06:42:58,534 INFO L87 Difference]: Start difference. First operand 426 states and 428 transitions. Second operand 90 states. [2020-11-07 06:43:36,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:43:36,094 INFO L93 Difference]: Finished difference Result 852 states and 857 transitions. [2020-11-07 06:43:36,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2020-11-07 06:43:36,098 INFO L78 Accepts]: Start accepts. Automaton has 90 states. Word has length 425 [2020-11-07 06:43:36,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:43:36,101 INFO L225 Difference]: With dead ends: 852 [2020-11-07 06:43:36,101 INFO L226 Difference]: Without dead ends: 449 [2020-11-07 06:43:36,104 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3742 ImplicationChecksByTransitivity, 23.2s TimeCoverageRelationStatistics Valid=655, Invalid=30497, Unknown=0, NotChecked=0, Total=31152 [2020-11-07 06:43:36,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 449 states. [2020-11-07 06:43:36,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 449 to 435. [2020-11-07 06:43:36,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 435 states. [2020-11-07 06:43:36,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 435 states to 435 states and 437 transitions. [2020-11-07 06:43:36,126 INFO L78 Accepts]: Start accepts. Automaton has 435 states and 437 transitions. Word has length 425 [2020-11-07 06:43:36,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:43:36,127 INFO L481 AbstractCegarLoop]: Abstraction has 435 states and 437 transitions. [2020-11-07 06:43:36,127 INFO L482 AbstractCegarLoop]: Interpolant automaton has 90 states. [2020-11-07 06:43:36,127 INFO L276 IsEmpty]: Start isEmpty. Operand 435 states and 437 transitions. [2020-11-07 06:43:36,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 435 [2020-11-07 06:43:36,130 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:43:36,130 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 44, 44, 44, 44, 44, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:43:36,130 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-11-07 06:43:36,131 INFO L429 AbstractCegarLoop]: === Iteration 48 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:43:36,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:43:36,131 INFO L82 PathProgramCache]: Analyzing trace with hash -129995331, now seen corresponding path program 44 times [2020-11-07 06:43:36,131 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:43:36,131 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2052757214] [2020-11-07 06:43:36,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:43:36,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:43:49,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:43:49,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:43:49,800 INFO L134 CoverageAnalysis]: Checked inductivity of 8560 backedges. 2 proven. 8558 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:43:49,801 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2052757214] [2020-11-07 06:43:49,801 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:43:49,801 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [92] total 92 [2020-11-07 06:43:49,801 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [610047083] [2020-11-07 06:43:49,802 INFO L461 AbstractCegarLoop]: Interpolant automaton has 92 states [2020-11-07 06:43:49,802 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:43:49,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2020-11-07 06:43:49,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=8147, Unknown=0, NotChecked=0, Total=8372 [2020-11-07 06:43:49,803 INFO L87 Difference]: Start difference. First operand 435 states and 437 transitions. Second operand 92 states. [2020-11-07 06:44:33,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:44:33,967 INFO L93 Difference]: Finished difference Result 870 states and 875 transitions. [2020-11-07 06:44:33,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2020-11-07 06:44:33,971 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 434 [2020-11-07 06:44:33,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:44:33,973 INFO L225 Difference]: With dead ends: 870 [2020-11-07 06:44:33,974 INFO L226 Difference]: Without dead ends: 458 [2020-11-07 06:44:33,976 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3917 ImplicationChecksByTransitivity, 26.0s TimeCoverageRelationStatistics Valid=670, Invalid=31910, Unknown=0, NotChecked=0, Total=32580 [2020-11-07 06:44:33,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 458 states. [2020-11-07 06:44:33,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 458 to 444. [2020-11-07 06:44:33,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 444 states. [2020-11-07 06:44:33,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 444 states to 444 states and 446 transitions. [2020-11-07 06:44:33,994 INFO L78 Accepts]: Start accepts. Automaton has 444 states and 446 transitions. Word has length 434 [2020-11-07 06:44:33,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:44:33,995 INFO L481 AbstractCegarLoop]: Abstraction has 444 states and 446 transitions. [2020-11-07 06:44:33,995 INFO L482 AbstractCegarLoop]: Interpolant automaton has 92 states. [2020-11-07 06:44:33,995 INFO L276 IsEmpty]: Start isEmpty. Operand 444 states and 446 transitions. [2020-11-07 06:44:33,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 444 [2020-11-07 06:44:33,998 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:44:33,998 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 45, 45, 45, 45, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:44:33,998 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-11-07 06:44:33,998 INFO L429 AbstractCegarLoop]: === Iteration 49 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:44:33,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:44:33,999 INFO L82 PathProgramCache]: Analyzing trace with hash -759894752, now seen corresponding path program 45 times [2020-11-07 06:44:33,999 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:44:33,999 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1651370356] [2020-11-07 06:44:34,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:44:34,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:44:48,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:44:49,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:44:49,314 INFO L134 CoverageAnalysis]: Checked inductivity of 8957 backedges. 2 proven. 8955 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:44:49,314 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1651370356] [2020-11-07 06:44:49,314 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:44:49,314 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [94] total 94 [2020-11-07 06:44:49,314 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1700009363] [2020-11-07 06:44:49,315 INFO L461 AbstractCegarLoop]: Interpolant automaton has 94 states [2020-11-07 06:44:49,315 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:44:49,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2020-11-07 06:44:49,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=8512, Unknown=0, NotChecked=0, Total=8742 [2020-11-07 06:44:49,316 INFO L87 Difference]: Start difference. First operand 444 states and 446 transitions. Second operand 94 states. [2020-11-07 06:45:39,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:45:39,660 INFO L93 Difference]: Finished difference Result 888 states and 893 transitions. [2020-11-07 06:45:39,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 140 states. [2020-11-07 06:45:39,662 INFO L78 Accepts]: Start accepts. Automaton has 94 states. Word has length 443 [2020-11-07 06:45:39,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:45:39,664 INFO L225 Difference]: With dead ends: 888 [2020-11-07 06:45:39,664 INFO L226 Difference]: Without dead ends: 467 [2020-11-07 06:45:39,667 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4096 ImplicationChecksByTransitivity, 29.0s TimeCoverageRelationStatistics Valid=685, Invalid=33355, Unknown=0, NotChecked=0, Total=34040 [2020-11-07 06:45:39,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 467 states. [2020-11-07 06:45:39,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 467 to 453. [2020-11-07 06:45:39,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 453 states. [2020-11-07 06:45:39,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 453 states to 453 states and 455 transitions. [2020-11-07 06:45:39,688 INFO L78 Accepts]: Start accepts. Automaton has 453 states and 455 transitions. Word has length 443 [2020-11-07 06:45:39,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:45:39,689 INFO L481 AbstractCegarLoop]: Abstraction has 453 states and 455 transitions. [2020-11-07 06:45:39,689 INFO L482 AbstractCegarLoop]: Interpolant automaton has 94 states. [2020-11-07 06:45:39,689 INFO L276 IsEmpty]: Start isEmpty. Operand 453 states and 455 transitions. [2020-11-07 06:45:39,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 453 [2020-11-07 06:45:39,692 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:45:39,692 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 46, 46, 46, 46, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:45:39,693 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-11-07 06:45:39,693 INFO L429 AbstractCegarLoop]: === Iteration 50 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:45:39,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:45:39,693 INFO L82 PathProgramCache]: Analyzing trace with hash 1648758045, now seen corresponding path program 46 times [2020-11-07 06:45:39,694 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:45:39,694 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1224410418] [2020-11-07 06:45:39,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:45:39,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:45:56,719 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:45:56,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:45:57,077 INFO L134 CoverageAnalysis]: Checked inductivity of 9363 backedges. 2 proven. 9361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:45:57,078 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1224410418] [2020-11-07 06:45:57,078 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:45:57,078 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96] total 96 [2020-11-07 06:45:57,078 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42575630] [2020-11-07 06:45:57,079 INFO L461 AbstractCegarLoop]: Interpolant automaton has 96 states [2020-11-07 06:45:57,079 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:45:57,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2020-11-07 06:45:57,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=8885, Unknown=0, NotChecked=0, Total=9120 [2020-11-07 06:45:57,080 INFO L87 Difference]: Start difference. First operand 453 states and 455 transitions. Second operand 96 states. [2020-11-07 06:46:55,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:46:55,463 INFO L93 Difference]: Finished difference Result 906 states and 911 transitions. [2020-11-07 06:46:55,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 143 states. [2020-11-07 06:46:55,466 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 452 [2020-11-07 06:46:55,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:46:55,469 INFO L225 Difference]: With dead ends: 906 [2020-11-07 06:46:55,469 INFO L226 Difference]: Without dead ends: 476 [2020-11-07 06:46:55,471 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4279 ImplicationChecksByTransitivity, 32.8s TimeCoverageRelationStatistics Valid=700, Invalid=34832, Unknown=0, NotChecked=0, Total=35532 [2020-11-07 06:46:55,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 476 states. [2020-11-07 06:46:55,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 476 to 462. [2020-11-07 06:46:55,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 462 states. [2020-11-07 06:46:55,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 462 states to 462 states and 464 transitions. [2020-11-07 06:46:55,492 INFO L78 Accepts]: Start accepts. Automaton has 462 states and 464 transitions. Word has length 452 [2020-11-07 06:46:55,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:46:55,493 INFO L481 AbstractCegarLoop]: Abstraction has 462 states and 464 transitions. [2020-11-07 06:46:55,493 INFO L482 AbstractCegarLoop]: Interpolant automaton has 96 states. [2020-11-07 06:46:55,493 INFO L276 IsEmpty]: Start isEmpty. Operand 462 states and 464 transitions. [2020-11-07 06:46:55,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 462 [2020-11-07 06:46:55,497 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:46:55,497 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 47, 47, 47, 47, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:46:55,497 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-11-07 06:46:55,497 INFO L429 AbstractCegarLoop]: === Iteration 51 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:46:55,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:46:55,498 INFO L82 PathProgramCache]: Analyzing trace with hash 387750336, now seen corresponding path program 47 times [2020-11-07 06:46:55,498 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:46:55,498 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [888751991] [2020-11-07 06:46:55,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:46:55,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:47:15,290 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:47:15,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:47:15,632 INFO L134 CoverageAnalysis]: Checked inductivity of 9778 backedges. 2 proven. 9776 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:47:15,633 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [888751991] [2020-11-07 06:47:15,633 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:47:15,633 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [98] total 98 [2020-11-07 06:47:15,633 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77130641] [2020-11-07 06:47:15,634 INFO L461 AbstractCegarLoop]: Interpolant automaton has 98 states [2020-11-07 06:47:15,634 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:47:15,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2020-11-07 06:47:15,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=9266, Unknown=0, NotChecked=0, Total=9506 [2020-11-07 06:47:15,635 INFO L87 Difference]: Start difference. First operand 462 states and 464 transitions. Second operand 98 states.