/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.1 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 03:42:17,544 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 03:42:17,547 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 03:42:17,574 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 03:42:17,574 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 03:42:17,575 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 03:42:17,577 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 03:42:17,578 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 03:42:17,580 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 03:42:17,581 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 03:42:17,582 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 03:42:17,583 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 03:42:17,583 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 03:42:17,584 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 03:42:17,585 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 03:42:17,587 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 03:42:17,587 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 03:42:17,588 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 03:42:17,590 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 03:42:17,592 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 03:42:17,593 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 03:42:17,594 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 03:42:17,595 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 03:42:17,596 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 03:42:17,599 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-19 03:42:17,599 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-19 03:42:17,599 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-19 03:42:17,600 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-19 03:42:17,600 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-19 03:42:17,601 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-19 03:42:17,602 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-19 03:42:17,602 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-19 03:42:17,603 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-19 03:42:17,604 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-19 03:42:17,605 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-19 03:42:17,605 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-19 03:42:17,606 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-19 03:42:17,606 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-19 03:42:17,606 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 03:42:17,607 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 03:42:17,608 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 03:42:17,609 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-19 03:42:17,656 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 03:42:17,656 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 03:42:17,657 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 03:42:17,658 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 03:42:17,658 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 03:42:17,658 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 03:42:17,658 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 03:42:17,659 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 03:42:17,661 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 03:42:17,661 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 03:42:17,661 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 03:42:17,662 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 03:42:17,662 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 03:42:17,662 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 03:42:17,662 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 03:42:17,662 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 03:42:17,662 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 03:42:17,663 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 03:42:17,663 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 03:42:17,663 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 03:42:17,663 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 03:42:17,665 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 03:42:17,666 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 03:42:17,666 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 03:42:17,666 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 03:42:17,666 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 03:42:17,666 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 03:42:17,667 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 03:42:17,667 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 03:42:17,667 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES 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: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.1; [2020-08-19 03:42:17,981 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 03:42:18,001 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 03:42:18,005 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 03:42:18,006 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 03:42:18,007 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 03:42:18,008 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-19 03:42:18,074 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/58b2c3313/9e42572170854a6aa966014b796a5061/FLAG3abaf62a6 [2020-08-19 03:42:18,497 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 03:42:18,498 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-19 03:42:18,505 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/58b2c3313/9e42572170854a6aa966014b796a5061/FLAG3abaf62a6 [2020-08-19 03:42:18,915 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/58b2c3313/9e42572170854a6aa966014b796a5061 [2020-08-19 03:42:18,924 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 03:42:18,925 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 03:42:18,926 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 03:42:18,927 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 03:42:18,930 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 03:42:18,931 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 03:42:18" (1/1) ... [2020-08-19 03:42:18,934 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@92e95d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:18, skipping insertion in model container [2020-08-19 03:42:18,934 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 03:42:18" (1/1) ... [2020-08-19 03:42:18,942 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 03:42:18,959 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 03:42:19,115 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 03:42:19,121 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 03:42:19,137 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 03:42:19,153 INFO L208 MainTranslator]: Completed translation [2020-08-19 03:42:19,153 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:19 WrapperNode [2020-08-19 03:42:19,154 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 03:42:19,154 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 03:42:19,155 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 03:42:19,155 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 03:42:19,169 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:19" (1/1) ... [2020-08-19 03:42:19,170 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:19" (1/1) ... [2020-08-19 03:42:19,249 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:19" (1/1) ... [2020-08-19 03:42:19,249 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:19" (1/1) ... [2020-08-19 03:42:19,258 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:19" (1/1) ... [2020-08-19 03:42:19,264 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:19" (1/1) ... [2020-08-19 03:42:19,265 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:19" (1/1) ... [2020-08-19 03:42:19,266 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 03:42:19,266 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 03:42:19,267 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 03:42:19,267 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 03:42:19,267 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:19" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-08-19 03:42:19,320 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 03:42:19,320 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 03:42:19,321 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 03:42:19,321 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 03:42:19,321 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 03:42:19,321 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 03:42:19,321 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 03:42:19,321 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 03:42:19,321 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 03:42:19,485 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 03:42:19,485 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-19 03:42:19,488 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 03:42:19 BoogieIcfgContainer [2020-08-19 03:42:19,489 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 03:42:19,490 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 03:42:19,490 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 03:42:19,493 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 03:42:19,494 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 03:42:18" (1/3) ... [2020-08-19 03:42:19,494 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48b8aa03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 03:42:19, skipping insertion in model container [2020-08-19 03:42:19,495 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 03:42:19" (2/3) ... [2020-08-19 03:42:19,495 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48b8aa03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 03:42:19, skipping insertion in model container [2020-08-19 03:42:19,495 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 03:42:19" (3/3) ... [2020-08-19 03:42:19,497 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_4-2.c [2020-08-19 03:42:19,508 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 03:42:19,516 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 03:42:19,531 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 03:42:19,557 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 03:42:19,557 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 03:42:19,557 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 03:42:19,557 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 03:42:19,557 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 03:42:19,558 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 03:42:19,558 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 03:42:19,558 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 03:42:19,576 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-19 03:42:19,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-19 03:42:19,583 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:19,584 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:19,584 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:19,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:19,592 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-19 03:42:19,601 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:19,602 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1106364715] [2020-08-19 03:42:19,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:19,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:19,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:19,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:19,807 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:19,808 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1106364715] [2020-08-19 03:42:19,810 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 03:42:19,811 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 03:42:19,812 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771805556] [2020-08-19 03:42:19,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 03:42:19,818 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:19,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 03:42:19,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 03:42:19,837 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-19 03:42:19,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:19,911 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-19 03:42:19,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 03:42:19,914 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-19 03:42:19,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:19,926 INFO L225 Difference]: With dead ends: 29 [2020-08-19 03:42:19,926 INFO L226 Difference]: Without dead ends: 12 [2020-08-19 03:42:19,931 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 03:42:19,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-19 03:42:19,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-19 03:42:19,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-19 03:42:19,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-19 03:42:19,977 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-19 03:42:19,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:19,978 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-19 03:42:19,978 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 03:42:19,978 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-19 03:42:19,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-19 03:42:19,992 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:19,992 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:19,997 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 03:42:19,998 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:20,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:20,000 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-19 03:42:20,001 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:20,001 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [189820649] [2020-08-19 03:42:20,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:20,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:20,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:20,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:20,106 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:20,107 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [189820649] [2020-08-19 03:42:20,107 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:20,107 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-19 03:42:20,108 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720487187] [2020-08-19 03:42:20,109 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 03:42:20,110 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:20,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 03:42:20,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-19 03:42:20,111 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-19 03:42:20,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:20,136 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-19 03:42:20,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 03:42:20,137 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-19 03:42:20,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:20,138 INFO L225 Difference]: With dead ends: 18 [2020-08-19 03:42:20,138 INFO L226 Difference]: Without dead ends: 13 [2020-08-19 03:42:20,140 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-19 03:42:20,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-19 03:42:20,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-19 03:42:20,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-19 03:42:20,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-19 03:42:20,145 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-19 03:42:20,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:20,146 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-19 03:42:20,146 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 03:42:20,146 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-19 03:42:20,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 03:42:20,147 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:20,147 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:20,148 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 03:42:20,148 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:20,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:20,149 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-19 03:42:20,149 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:20,149 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1761127446] [2020-08-19 03:42:20,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:20,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:20,261 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:20,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:20,266 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:20,266 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1761127446] [2020-08-19 03:42:20,267 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:20,267 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 03:42:20,267 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375139016] [2020-08-19 03:42:20,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 03:42:20,268 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:20,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 03:42:20,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-19 03:42:20,269 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-19 03:42:20,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:20,293 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-19 03:42:20,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 03:42:20,294 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-19 03:42:20,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:20,295 INFO L225 Difference]: With dead ends: 19 [2020-08-19 03:42:20,295 INFO L226 Difference]: Without dead ends: 14 [2020-08-19 03:42:20,296 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-19 03:42:20,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-19 03:42:20,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-19 03:42:20,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-19 03:42:20,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-19 03:42:20,302 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-19 03:42:20,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:20,302 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-19 03:42:20,303 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 03:42:20,303 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-19 03:42:20,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-19 03:42:20,304 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:20,304 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:20,304 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 03:42:20,304 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:20,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:20,305 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-19 03:42:20,305 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:20,306 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [869354365] [2020-08-19 03:42:20,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:20,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:20,472 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:20,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:20,482 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:20,483 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [869354365] [2020-08-19 03:42:20,483 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:20,483 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 03:42:20,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382958784] [2020-08-19 03:42:20,484 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 03:42:20,485 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:20,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 03:42:20,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-19 03:42:20,486 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-19 03:42:20,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:20,528 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-19 03:42:20,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 03:42:20,529 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-19 03:42:20,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:20,530 INFO L225 Difference]: With dead ends: 20 [2020-08-19 03:42:20,530 INFO L226 Difference]: Without dead ends: 15 [2020-08-19 03:42:20,531 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-19 03:42:20,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-19 03:42:20,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-19 03:42:20,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 03:42:20,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-19 03:42:20,537 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-19 03:42:20,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:20,537 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-19 03:42:20,537 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 03:42:20,537 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-19 03:42:20,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-19 03:42:20,538 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:20,538 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:20,539 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 03:42:20,539 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:20,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:20,540 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-19 03:42:20,540 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:20,540 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2140974781] [2020-08-19 03:42:20,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:20,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:20,643 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:20,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:20,647 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:20,648 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2140974781] [2020-08-19 03:42:20,648 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:20,648 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 03:42:20,649 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138164388] [2020-08-19 03:42:20,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 03:42:20,649 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:20,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 03:42:20,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-19 03:42:20,650 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-19 03:42:20,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:20,715 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-19 03:42:20,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 03:42:20,717 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-19 03:42:20,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:20,718 INFO L225 Difference]: With dead ends: 21 [2020-08-19 03:42:20,718 INFO L226 Difference]: Without dead ends: 16 [2020-08-19 03:42:20,720 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-19 03:42:20,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-19 03:42:20,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-19 03:42:20,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-19 03:42:20,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-19 03:42:20,731 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-19 03:42:20,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:20,731 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-19 03:42:20,731 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 03:42:20,732 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-19 03:42:20,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-19 03:42:20,732 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:20,733 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:20,734 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 03:42:20,734 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:20,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:20,735 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-19 03:42:20,735 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:20,736 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1069997645] [2020-08-19 03:42:20,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:20,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:20,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:20,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:20,933 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:20,934 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1069997645] [2020-08-19 03:42:20,934 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:20,934 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 03:42:20,935 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1545961362] [2020-08-19 03:42:20,935 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 03:42:20,935 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:20,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 03:42:20,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-19 03:42:20,936 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-19 03:42:21,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:21,004 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-19 03:42:21,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 03:42:21,008 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-19 03:42:21,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:21,008 INFO L225 Difference]: With dead ends: 22 [2020-08-19 03:42:21,009 INFO L226 Difference]: Without dead ends: 17 [2020-08-19 03:42:21,009 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-19 03:42:21,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-19 03:42:21,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-19 03:42:21,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 03:42:21,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-19 03:42:21,021 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-19 03:42:21,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:21,022 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-19 03:42:21,022 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 03:42:21,022 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-19 03:42:21,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 03:42:21,028 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:21,028 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:21,028 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 03:42:21,029 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:21,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:21,029 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-19 03:42:21,029 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:21,031 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1410615073] [2020-08-19 03:42:21,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:21,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:21,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:21,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:21,200 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:21,201 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1410615073] [2020-08-19 03:42:21,201 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:21,201 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 03:42:21,202 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219991037] [2020-08-19 03:42:21,202 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 03:42:21,202 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:21,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 03:42:21,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-19 03:42:21,203 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-19 03:42:21,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:21,255 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-19 03:42:21,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 03:42:21,256 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-19 03:42:21,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:21,256 INFO L225 Difference]: With dead ends: 23 [2020-08-19 03:42:21,257 INFO L226 Difference]: Without dead ends: 18 [2020-08-19 03:42:21,257 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-19 03:42:21,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-19 03:42:21,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-19 03:42:21,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-19 03:42:21,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-19 03:42:21,263 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-19 03:42:21,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:21,263 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-19 03:42:21,263 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 03:42:21,263 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-19 03:42:21,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-19 03:42:21,264 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:21,264 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:21,265 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 03:42:21,265 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:21,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:21,265 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-19 03:42:21,265 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:21,266 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [259164079] [2020-08-19 03:42:21,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:21,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:21,408 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:21,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:21,412 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:21,412 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [259164079] [2020-08-19 03:42:21,412 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:21,413 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 03:42:21,413 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784241780] [2020-08-19 03:42:21,413 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 03:42:21,414 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:21,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 03:42:21,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-19 03:42:21,415 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-19 03:42:21,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:21,471 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-19 03:42:21,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 03:42:21,471 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-19 03:42:21,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:21,472 INFO L225 Difference]: With dead ends: 24 [2020-08-19 03:42:21,472 INFO L226 Difference]: Without dead ends: 19 [2020-08-19 03:42:21,473 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-19 03:42:21,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-19 03:42:21,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-19 03:42:21,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-19 03:42:21,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-19 03:42:21,478 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-19 03:42:21,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:21,479 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-19 03:42:21,479 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 03:42:21,479 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-19 03:42:21,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-19 03:42:21,480 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:21,480 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:21,480 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 03:42:21,480 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:21,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:21,481 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-19 03:42:21,481 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:21,481 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1980802209] [2020-08-19 03:42:21,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:21,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:21,642 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:21,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:21,649 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:21,649 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1980802209] [2020-08-19 03:42:21,650 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:21,650 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 03:42:21,650 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773473469] [2020-08-19 03:42:21,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 03:42:21,652 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:21,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 03:42:21,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-19 03:42:21,653 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-19 03:42:21,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:21,754 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-19 03:42:21,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 03:42:21,755 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-19 03:42:21,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:21,756 INFO L225 Difference]: With dead ends: 25 [2020-08-19 03:42:21,757 INFO L226 Difference]: Without dead ends: 20 [2020-08-19 03:42:21,757 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-19 03:42:21,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-19 03:42:21,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-19 03:42:21,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-19 03:42:21,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-19 03:42:21,773 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-19 03:42:21,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:21,774 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-19 03:42:21,774 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 03:42:21,774 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-19 03:42:21,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-19 03:42:21,775 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:21,775 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:21,778 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 03:42:21,779 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:21,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:21,780 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-19 03:42:21,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:21,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2125131212] [2020-08-19 03:42:21,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:21,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:21,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:21,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:22,001 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:22,003 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2125131212] [2020-08-19 03:42:22,003 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:22,003 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 03:42:22,004 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348385414] [2020-08-19 03:42:22,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 03:42:22,005 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:22,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 03:42:22,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-19 03:42:22,005 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-19 03:42:22,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:22,121 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-19 03:42:22,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 03:42:22,121 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-19 03:42:22,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:22,122 INFO L225 Difference]: With dead ends: 26 [2020-08-19 03:42:22,123 INFO L226 Difference]: Without dead ends: 21 [2020-08-19 03:42:22,123 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-19 03:42:22,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-19 03:42:22,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-19 03:42:22,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-19 03:42:22,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-19 03:42:22,129 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-19 03:42:22,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:22,130 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-19 03:42:22,130 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 03:42:22,130 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-19 03:42:22,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 03:42:22,131 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:22,131 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:22,131 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 03:42:22,131 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:22,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:22,132 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-19 03:42:22,132 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:22,133 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2095525726] [2020-08-19 03:42:22,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:22,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:22,348 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:22,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:22,353 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:22,354 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2095525726] [2020-08-19 03:42:22,354 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:22,354 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 03:42:22,355 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801000386] [2020-08-19 03:42:22,355 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 03:42:22,355 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:22,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 03:42:22,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-19 03:42:22,356 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-19 03:42:22,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:22,469 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-19 03:42:22,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 03:42:22,469 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-19 03:42:22,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:22,470 INFO L225 Difference]: With dead ends: 27 [2020-08-19 03:42:22,470 INFO L226 Difference]: Without dead ends: 22 [2020-08-19 03:42:22,471 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-19 03:42:22,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-19 03:42:22,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-19 03:42:22,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-19 03:42:22,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-19 03:42:22,476 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-19 03:42:22,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:22,477 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-19 03:42:22,477 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 03:42:22,477 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-19 03:42:22,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-19 03:42:22,478 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:22,478 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:22,479 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 03:42:22,479 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:22,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:22,479 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-19 03:42:22,479 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:22,480 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1887051953] [2020-08-19 03:42:22,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:22,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:22,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:22,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:22,676 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:22,676 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1887051953] [2020-08-19 03:42:22,677 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:22,677 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 03:42:22,677 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250847645] [2020-08-19 03:42:22,678 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 03:42:22,678 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:22,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 03:42:22,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-19 03:42:22,679 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-19 03:42:22,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:22,790 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-19 03:42:22,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 03:42:22,790 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-19 03:42:22,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:22,791 INFO L225 Difference]: With dead ends: 28 [2020-08-19 03:42:22,791 INFO L226 Difference]: Without dead ends: 23 [2020-08-19 03:42:22,792 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-19 03:42:22,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-19 03:42:22,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-19 03:42:22,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-19 03:42:22,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-19 03:42:22,797 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-19 03:42:22,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:22,798 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-19 03:42:22,798 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 03:42:22,798 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-19 03:42:22,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-19 03:42:22,799 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:22,799 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:22,799 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 03:42:22,799 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:22,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:22,800 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-19 03:42:22,800 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:22,800 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1016577157] [2020-08-19 03:42:22,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:22,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:23,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:23,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:23,050 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:23,054 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1016577157] [2020-08-19 03:42:23,055 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:23,055 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 03:42:23,055 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1370124049] [2020-08-19 03:42:23,056 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 03:42:23,056 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:23,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 03:42:23,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-19 03:42:23,057 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-19 03:42:23,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:23,201 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-19 03:42:23,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 03:42:23,204 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-19 03:42:23,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:23,205 INFO L225 Difference]: With dead ends: 29 [2020-08-19 03:42:23,205 INFO L226 Difference]: Without dead ends: 24 [2020-08-19 03:42:23,206 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-19 03:42:23,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-19 03:42:23,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-19 03:42:23,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-19 03:42:23,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-19 03:42:23,214 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-19 03:42:23,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:23,214 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-19 03:42:23,214 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 03:42:23,214 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-19 03:42:23,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-19 03:42:23,215 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:23,215 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:23,215 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 03:42:23,215 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:23,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:23,216 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-19 03:42:23,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:23,220 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2011765657] [2020-08-19 03:42:23,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:23,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:23,486 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:23,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:23,490 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:23,490 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2011765657] [2020-08-19 03:42:23,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:23,491 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 03:42:23,491 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947770434] [2020-08-19 03:42:23,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 03:42:23,492 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:23,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 03:42:23,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-19 03:42:23,492 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-19 03:42:23,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:23,630 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-19 03:42:23,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 03:42:23,631 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-19 03:42:23,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:23,632 INFO L225 Difference]: With dead ends: 30 [2020-08-19 03:42:23,632 INFO L226 Difference]: Without dead ends: 25 [2020-08-19 03:42:23,632 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-19 03:42:23,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-19 03:42:23,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-19 03:42:23,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-19 03:42:23,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-19 03:42:23,638 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-19 03:42:23,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:23,638 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-19 03:42:23,638 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 03:42:23,638 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-19 03:42:23,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 03:42:23,639 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:23,639 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:23,639 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 03:42:23,639 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:23,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:23,640 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-19 03:42:23,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:23,640 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1524509666] [2020-08-19 03:42:23,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:23,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:23,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:23,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:23,906 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:23,907 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1524509666] [2020-08-19 03:42:23,907 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:23,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 03:42:23,908 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871337295] [2020-08-19 03:42:23,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 03:42:23,908 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:23,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 03:42:23,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-19 03:42:23,909 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-19 03:42:24,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:24,065 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-19 03:42:24,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 03:42:24,066 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-19 03:42:24,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:24,067 INFO L225 Difference]: With dead ends: 31 [2020-08-19 03:42:24,067 INFO L226 Difference]: Without dead ends: 26 [2020-08-19 03:42:24,068 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-19 03:42:24,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-19 03:42:24,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-19 03:42:24,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-19 03:42:24,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-19 03:42:24,075 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-19 03:42:24,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:24,077 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-19 03:42:24,077 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 03:42:24,077 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-19 03:42:24,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-19 03:42:24,080 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:24,080 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:24,080 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 03:42:24,080 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:24,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:24,081 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-19 03:42:24,081 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:24,081 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [390861456] [2020-08-19 03:42:24,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:24,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:24,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:24,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:24,363 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:24,363 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [390861456] [2020-08-19 03:42:24,363 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:24,364 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 03:42:24,364 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2101757861] [2020-08-19 03:42:24,364 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 03:42:24,364 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:24,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 03:42:24,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-19 03:42:24,365 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-19 03:42:24,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:24,538 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-19 03:42:24,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 03:42:24,538 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-19 03:42:24,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:24,539 INFO L225 Difference]: With dead ends: 32 [2020-08-19 03:42:24,539 INFO L226 Difference]: Without dead ends: 27 [2020-08-19 03:42:24,540 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-19 03:42:24,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-19 03:42:24,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-19 03:42:24,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-19 03:42:24,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-19 03:42:24,545 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-19 03:42:24,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:24,545 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-19 03:42:24,545 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 03:42:24,545 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-19 03:42:24,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-19 03:42:24,546 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:24,546 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:24,546 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 03:42:24,547 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:24,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:24,547 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-19 03:42:24,547 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:24,548 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1370565309] [2020-08-19 03:42:24,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:24,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:24,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:24,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:24,834 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:24,835 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1370565309] [2020-08-19 03:42:24,835 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:24,835 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 03:42:24,835 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1938426832] [2020-08-19 03:42:24,836 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 03:42:24,836 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:24,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 03:42:24,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-19 03:42:24,837 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-19 03:42:25,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:25,052 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-19 03:42:25,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 03:42:25,053 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-19 03:42:25,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:25,054 INFO L225 Difference]: With dead ends: 33 [2020-08-19 03:42:25,054 INFO L226 Difference]: Without dead ends: 28 [2020-08-19 03:42:25,054 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-19 03:42:25,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-19 03:42:25,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-19 03:42:25,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-19 03:42:25,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-19 03:42:25,060 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-19 03:42:25,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:25,060 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-19 03:42:25,060 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 03:42:25,060 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-19 03:42:25,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-19 03:42:25,061 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:25,061 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:25,061 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 03:42:25,062 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:25,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:25,062 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-19 03:42:25,062 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:25,063 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1356322957] [2020-08-19 03:42:25,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:25,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:25,382 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:25,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:25,385 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:25,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1356322957] [2020-08-19 03:42:25,385 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:25,385 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 03:42:25,386 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1832454744] [2020-08-19 03:42:25,388 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 03:42:25,388 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:25,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 03:42:25,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-19 03:42:25,389 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-19 03:42:25,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:25,655 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-19 03:42:25,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 03:42:25,656 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-19 03:42:25,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:25,657 INFO L225 Difference]: With dead ends: 34 [2020-08-19 03:42:25,657 INFO L226 Difference]: Without dead ends: 29 [2020-08-19 03:42:25,658 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-19 03:42:25,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-19 03:42:25,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-19 03:42:25,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 03:42:25,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-19 03:42:25,664 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-19 03:42:25,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:25,665 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-19 03:42:25,665 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 03:42:25,665 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-19 03:42:25,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 03:42:25,666 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:25,666 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:25,666 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 03:42:25,666 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:25,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:25,667 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-19 03:42:25,668 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:25,669 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1827228244] [2020-08-19 03:42:25,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:25,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:26,038 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:26,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:26,042 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:26,042 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1827228244] [2020-08-19 03:42:26,042 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:26,042 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 03:42:26,043 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739923776] [2020-08-19 03:42:26,043 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 03:42:26,043 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:26,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 03:42:26,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-19 03:42:26,044 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-19 03:42:26,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:26,297 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-19 03:42:26,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 03:42:26,298 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-19 03:42:26,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:26,299 INFO L225 Difference]: With dead ends: 35 [2020-08-19 03:42:26,299 INFO L226 Difference]: Without dead ends: 30 [2020-08-19 03:42:26,300 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-19 03:42:26,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-19 03:42:26,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-19 03:42:26,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-19 03:42:26,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-19 03:42:26,305 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-19 03:42:26,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:26,305 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-19 03:42:26,305 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 03:42:26,305 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-19 03:42:26,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-19 03:42:26,306 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:26,306 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:26,306 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 03:42:26,307 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:26,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:26,307 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-19 03:42:26,307 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:26,307 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [348897375] [2020-08-19 03:42:26,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:26,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:26,705 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:26,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:26,708 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:26,709 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [348897375] [2020-08-19 03:42:26,709 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:26,709 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 03:42:26,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85911087] [2020-08-19 03:42:26,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 03:42:26,710 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:26,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 03:42:26,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-19 03:42:26,710 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-19 03:42:26,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:26,992 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-19 03:42:27,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 03:42:27,000 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-19 03:42:27,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:27,001 INFO L225 Difference]: With dead ends: 36 [2020-08-19 03:42:27,001 INFO L226 Difference]: Without dead ends: 31 [2020-08-19 03:42:27,002 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-19 03:42:27,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-19 03:42:27,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-19 03:42:27,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-19 03:42:27,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-19 03:42:27,011 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-19 03:42:27,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:27,011 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-19 03:42:27,011 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 03:42:27,011 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-19 03:42:27,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-19 03:42:27,012 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:27,012 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:27,013 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 03:42:27,013 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:27,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:27,013 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-19 03:42:27,013 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:27,014 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1691677354] [2020-08-19 03:42:27,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:27,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:27,429 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:27,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:27,433 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:27,434 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1691677354] [2020-08-19 03:42:27,434 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:27,434 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 03:42:27,434 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354713516] [2020-08-19 03:42:27,435 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 03:42:27,435 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:27,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 03:42:27,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-19 03:42:27,436 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-19 03:42:27,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:27,705 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-19 03:42:27,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 03:42:27,706 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-19 03:42:27,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:27,707 INFO L225 Difference]: With dead ends: 37 [2020-08-19 03:42:27,707 INFO L226 Difference]: Without dead ends: 32 [2020-08-19 03:42:27,708 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-19 03:42:27,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-19 03:42:27,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-19 03:42:27,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-19 03:42:27,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-19 03:42:27,712 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-19 03:42:27,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:27,713 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-19 03:42:27,713 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 03:42:27,713 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-19 03:42:27,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-19 03:42:27,714 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:27,714 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:27,714 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 03:42:27,714 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:27,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:27,715 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-19 03:42:27,715 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:27,715 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1152624873] [2020-08-19 03:42:27,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:27,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:28,139 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:28,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:28,143 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:28,144 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1152624873] [2020-08-19 03:42:28,144 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:28,144 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 03:42:28,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082766136] [2020-08-19 03:42:28,145 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 03:42:28,145 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:28,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 03:42:28,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-19 03:42:28,146 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-19 03:42:28,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:28,457 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-19 03:42:28,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 03:42:28,458 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-19 03:42:28,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:28,459 INFO L225 Difference]: With dead ends: 38 [2020-08-19 03:42:28,459 INFO L226 Difference]: Without dead ends: 33 [2020-08-19 03:42:28,460 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-19 03:42:28,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-19 03:42:28,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-19 03:42:28,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 03:42:28,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-19 03:42:28,464 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-19 03:42:28,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:28,465 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-19 03:42:28,465 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 03:42:28,465 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-19 03:42:28,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-19 03:42:28,466 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:28,466 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:28,466 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 03:42:28,467 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:28,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:28,467 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-19 03:42:28,467 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:28,468 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [493286370] [2020-08-19 03:42:28,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:28,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:28,946 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:28,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:28,949 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:28,950 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [493286370] [2020-08-19 03:42:28,950 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:28,951 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 03:42:28,951 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446302933] [2020-08-19 03:42:28,951 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 03:42:28,951 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:28,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 03:42:28,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-19 03:42:28,956 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-19 03:42:29,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:29,245 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-19 03:42:29,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 03:42:29,245 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-19 03:42:29,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:29,246 INFO L225 Difference]: With dead ends: 39 [2020-08-19 03:42:29,246 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 03:42:29,247 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-19 03:42:29,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 03:42:29,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-19 03:42:29,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-19 03:42:29,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-19 03:42:29,252 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-19 03:42:29,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:29,252 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-19 03:42:29,252 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 03:42:29,252 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-19 03:42:29,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-19 03:42:29,253 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:29,253 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:29,253 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 03:42:29,254 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:29,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:29,254 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-19 03:42:29,254 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:29,254 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [10089307] [2020-08-19 03:42:29,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:29,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:29,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:29,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:29,778 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:29,778 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [10089307] [2020-08-19 03:42:29,778 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:29,779 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-19 03:42:29,779 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129338915] [2020-08-19 03:42:29,779 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-19 03:42:29,779 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:29,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-19 03:42:29,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-19 03:42:29,780 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-19 03:42:30,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:30,118 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-19 03:42:30,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-19 03:42:30,119 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-19 03:42:30,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:30,119 INFO L225 Difference]: With dead ends: 40 [2020-08-19 03:42:30,119 INFO L226 Difference]: Without dead ends: 35 [2020-08-19 03:42:30,120 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-19 03:42:30,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-19 03:42:30,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-19 03:42:30,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 03:42:30,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-19 03:42:30,126 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-19 03:42:30,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:30,126 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-19 03:42:30,127 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-19 03:42:30,127 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-19 03:42:30,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 03:42:30,127 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:30,128 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:30,129 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 03:42:30,131 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:30,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:30,132 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-19 03:42:30,132 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:30,132 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1741143999] [2020-08-19 03:42:30,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:30,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:30,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:30,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:30,716 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:30,716 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1741143999] [2020-08-19 03:42:30,716 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:30,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-19 03:42:30,717 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756997041] [2020-08-19 03:42:30,717 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-19 03:42:30,717 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:30,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-19 03:42:30,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-19 03:42:30,718 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-19 03:42:31,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:31,118 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-19 03:42:31,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-19 03:42:31,118 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-19 03:42:31,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:31,119 INFO L225 Difference]: With dead ends: 41 [2020-08-19 03:42:31,119 INFO L226 Difference]: Without dead ends: 36 [2020-08-19 03:42:31,120 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-19 03:42:31,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-19 03:42:31,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-19 03:42:31,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-19 03:42:31,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-19 03:42:31,125 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-19 03:42:31,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:31,125 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-19 03:42:31,125 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-19 03:42:31,125 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-19 03:42:31,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-19 03:42:31,126 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:31,126 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:31,126 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 03:42:31,126 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:31,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:31,127 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-19 03:42:31,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:31,127 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1288226713] [2020-08-19 03:42:31,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:31,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:31,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:31,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:31,682 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:31,683 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1288226713] [2020-08-19 03:42:31,683 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:31,683 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-19 03:42:31,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244671270] [2020-08-19 03:42:31,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-19 03:42:31,685 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:31,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-19 03:42:31,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-19 03:42:31,686 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-19 03:42:32,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:32,100 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-19 03:42:32,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-19 03:42:32,100 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-19 03:42:32,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:32,101 INFO L225 Difference]: With dead ends: 42 [2020-08-19 03:42:32,102 INFO L226 Difference]: Without dead ends: 37 [2020-08-19 03:42:32,102 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-19 03:42:32,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-19 03:42:32,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-19 03:42:32,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 03:42:32,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-19 03:42:32,107 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-19 03:42:32,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:32,107 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-19 03:42:32,107 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-19 03:42:32,107 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-19 03:42:32,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 03:42:32,108 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:32,108 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:32,108 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 03:42:32,108 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:32,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:32,109 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-19 03:42:32,109 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:32,109 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [268659667] [2020-08-19 03:42:32,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:32,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:32,689 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:32,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:32,693 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:32,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [268659667] [2020-08-19 03:42:32,694 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:32,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-19 03:42:32,694 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075862524] [2020-08-19 03:42:32,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-19 03:42:32,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:32,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-19 03:42:32,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-19 03:42:32,696 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-19 03:42:33,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:33,149 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-19 03:42:33,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-19 03:42:33,153 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-19 03:42:33,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:33,154 INFO L225 Difference]: With dead ends: 43 [2020-08-19 03:42:33,154 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 03:42:33,154 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-19 03:42:33,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 03:42:33,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-19 03:42:33,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-19 03:42:33,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-19 03:42:33,164 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-19 03:42:33,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:33,164 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-19 03:42:33,164 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-19 03:42:33,165 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-19 03:42:33,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-19 03:42:33,168 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:33,168 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:33,169 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 03:42:33,169 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:33,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:33,169 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-19 03:42:33,169 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:33,172 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [440804560] [2020-08-19 03:42:33,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:33,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:33,843 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:33,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:33,848 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:33,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [440804560] [2020-08-19 03:42:33,849 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:33,849 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-19 03:42:33,849 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259627783] [2020-08-19 03:42:33,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-19 03:42:33,849 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:33,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-19 03:42:33,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-19 03:42:33,850 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-19 03:42:34,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:34,351 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-19 03:42:34,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-19 03:42:34,352 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-19 03:42:34,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:34,353 INFO L225 Difference]: With dead ends: 44 [2020-08-19 03:42:34,353 INFO L226 Difference]: Without dead ends: 39 [2020-08-19 03:42:34,354 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-19 03:42:34,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-19 03:42:34,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-19 03:42:34,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-19 03:42:34,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-19 03:42:34,358 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-19 03:42:34,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:34,358 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-19 03:42:34,358 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-19 03:42:34,358 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-19 03:42:34,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-19 03:42:34,359 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:34,359 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:34,359 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 03:42:34,359 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:34,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:34,359 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-19 03:42:34,359 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:34,360 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1478001395] [2020-08-19 03:42:34,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:34,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:35,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:35,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:35,056 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:35,056 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1478001395] [2020-08-19 03:42:35,057 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:35,057 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-19 03:42:35,057 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1799428817] [2020-08-19 03:42:35,057 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-19 03:42:35,057 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:35,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-19 03:42:35,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-19 03:42:35,058 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-19 03:42:35,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:35,573 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-19 03:42:35,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-19 03:42:35,573 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-19 03:42:35,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:35,574 INFO L225 Difference]: With dead ends: 45 [2020-08-19 03:42:35,574 INFO L226 Difference]: Without dead ends: 40 [2020-08-19 03:42:35,575 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-19 03:42:35,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-19 03:42:35,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-19 03:42:35,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-19 03:42:35,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-19 03:42:35,579 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-19 03:42:35,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:35,579 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-19 03:42:35,580 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-19 03:42:35,580 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-19 03:42:35,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-19 03:42:35,580 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:35,580 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:35,580 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-19 03:42:35,581 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:35,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:35,581 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-19 03:42:35,581 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:35,581 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1674166373] [2020-08-19 03:42:35,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:35,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:36,355 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:36,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:36,360 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:36,360 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1674166373] [2020-08-19 03:42:36,360 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:36,360 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-19 03:42:36,361 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083843089] [2020-08-19 03:42:36,361 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-19 03:42:36,361 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:36,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-19 03:42:36,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-19 03:42:36,362 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-19 03:42:36,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:36,921 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-19 03:42:36,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-19 03:42:36,922 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-19 03:42:36,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:36,923 INFO L225 Difference]: With dead ends: 46 [2020-08-19 03:42:36,923 INFO L226 Difference]: Without dead ends: 41 [2020-08-19 03:42:36,924 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-19 03:42:36,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-19 03:42:36,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-19 03:42:36,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 03:42:36,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-19 03:42:36,929 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-19 03:42:36,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:36,929 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-19 03:42:36,929 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-19 03:42:36,929 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-19 03:42:36,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-19 03:42:36,930 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:36,930 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:36,930 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-19 03:42:36,930 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:36,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:36,931 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-19 03:42:36,931 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:36,931 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1168576966] [2020-08-19 03:42:36,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:36,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:37,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:37,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:37,676 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:37,676 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1168576966] [2020-08-19 03:42:37,677 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:37,677 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-19 03:42:37,677 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358421697] [2020-08-19 03:42:37,677 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-19 03:42:37,678 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:37,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-19 03:42:37,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 03:42:37,678 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-19 03:42:38,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:38,279 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-19 03:42:38,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-19 03:42:38,279 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-19 03:42:38,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:38,280 INFO L225 Difference]: With dead ends: 47 [2020-08-19 03:42:38,281 INFO L226 Difference]: Without dead ends: 42 [2020-08-19 03:42:38,281 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 03:42:38,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-19 03:42:38,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-19 03:42:38,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-19 03:42:38,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-19 03:42:38,285 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-19 03:42:38,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:38,285 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-19 03:42:38,285 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-19 03:42:38,286 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-19 03:42:38,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-19 03:42:38,286 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:38,286 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:38,286 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-19 03:42:38,287 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:38,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:38,287 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-19 03:42:38,287 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:38,287 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1745165795] [2020-08-19 03:42:38,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:38,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:39,149 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:39,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:39,155 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:39,156 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1745165795] [2020-08-19 03:42:39,156 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:39,156 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-19 03:42:39,156 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524898965] [2020-08-19 03:42:39,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-19 03:42:39,157 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:39,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-19 03:42:39,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 03:42:39,158 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-19 03:42:39,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:39,815 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-19 03:42:39,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-19 03:42:39,816 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-19 03:42:39,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:39,817 INFO L225 Difference]: With dead ends: 48 [2020-08-19 03:42:39,817 INFO L226 Difference]: Without dead ends: 43 [2020-08-19 03:42:39,818 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 03:42:39,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-19 03:42:39,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-19 03:42:39,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 03:42:39,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-19 03:42:39,822 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-19 03:42:39,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:39,823 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-19 03:42:39,823 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-19 03:42:39,823 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-19 03:42:39,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-19 03:42:39,823 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:39,824 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:39,824 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-19 03:42:39,824 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:39,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:39,824 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-19 03:42:39,824 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:39,825 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1032656022] [2020-08-19 03:42:39,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:39,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:40,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:40,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:40,672 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:40,673 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1032656022] [2020-08-19 03:42:40,673 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:40,673 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-19 03:42:40,673 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158775368] [2020-08-19 03:42:40,673 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-19 03:42:40,674 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:40,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-19 03:42:40,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 03:42:40,675 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-19 03:42:41,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:41,427 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-19 03:42:41,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-19 03:42:41,428 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-19 03:42:41,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:41,429 INFO L225 Difference]: With dead ends: 49 [2020-08-19 03:42:41,429 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 03:42:41,430 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 03:42:41,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 03:42:41,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-19 03:42:41,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-19 03:42:41,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-19 03:42:41,434 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-19 03:42:41,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:41,435 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-19 03:42:41,435 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-19 03:42:41,435 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-19 03:42:41,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-19 03:42:41,435 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:41,436 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:41,436 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-19 03:42:41,436 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:41,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:41,436 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-19 03:42:41,436 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:41,437 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [915275052] [2020-08-19 03:42:41,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:41,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:42,339 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:42,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:42,344 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:42,344 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [915275052] [2020-08-19 03:42:42,344 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:42,344 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-19 03:42:42,345 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329644908] [2020-08-19 03:42:42,345 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-19 03:42:42,345 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:42,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-19 03:42:42,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 03:42:42,346 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-19 03:42:43,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:43,104 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-19 03:42:43,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-19 03:42:43,105 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-19 03:42:43,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:43,106 INFO L225 Difference]: With dead ends: 50 [2020-08-19 03:42:43,106 INFO L226 Difference]: Without dead ends: 45 [2020-08-19 03:42:43,107 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 03:42:43,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-19 03:42:43,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-19 03:42:43,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-19 03:42:43,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-19 03:42:43,111 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-19 03:42:43,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:43,111 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-19 03:42:43,111 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-19 03:42:43,111 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-19 03:42:43,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 03:42:43,112 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:43,112 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:43,112 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-19 03:42:43,112 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:43,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:43,113 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-19 03:42:43,113 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:43,113 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1611406485] [2020-08-19 03:42:43,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:43,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:44,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:44,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:44,036 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:44,037 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1611406485] [2020-08-19 03:42:44,037 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:44,037 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-19 03:42:44,037 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1362215905] [2020-08-19 03:42:44,038 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-19 03:42:44,038 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:44,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-19 03:42:44,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 03:42:44,039 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-19 03:42:44,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:44,849 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-19 03:42:44,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-19 03:42:44,850 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-19 03:42:44,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:44,850 INFO L225 Difference]: With dead ends: 51 [2020-08-19 03:42:44,850 INFO L226 Difference]: Without dead ends: 46 [2020-08-19 03:42:44,851 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 03:42:44,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-19 03:42:44,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-19 03:42:44,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-19 03:42:44,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-19 03:42:44,855 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-19 03:42:44,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:44,856 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-19 03:42:44,856 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-19 03:42:44,856 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-19 03:42:44,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-19 03:42:44,856 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:44,856 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:44,857 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-19 03:42:44,857 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:44,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:44,857 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-19 03:42:44,857 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:44,858 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [422399067] [2020-08-19 03:42:44,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:44,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:45,841 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:45,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:45,846 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:45,846 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [422399067] [2020-08-19 03:42:45,846 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:45,846 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-19 03:42:45,846 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370675141] [2020-08-19 03:42:45,846 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-19 03:42:45,847 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:45,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-19 03:42:45,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 03:42:45,847 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-19 03:42:46,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:46,651 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-19 03:42:46,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-19 03:42:46,652 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-19 03:42:46,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:46,653 INFO L225 Difference]: With dead ends: 52 [2020-08-19 03:42:46,653 INFO L226 Difference]: Without dead ends: 47 [2020-08-19 03:42:46,654 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 03:42:46,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-19 03:42:46,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-19 03:42:46,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-19 03:42:46,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-19 03:42:46,657 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-19 03:42:46,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:46,658 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-19 03:42:46,658 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-19 03:42:46,658 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-19 03:42:46,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-19 03:42:46,658 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:46,659 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:46,659 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-19 03:42:46,659 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:46,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:46,659 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-19 03:42:46,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:46,660 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1205246444] [2020-08-19 03:42:46,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:46,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:47,691 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:47,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:47,696 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:47,696 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1205246444] [2020-08-19 03:42:47,696 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:47,697 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-19 03:42:47,697 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338670416] [2020-08-19 03:42:47,697 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-19 03:42:47,697 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:47,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-19 03:42:47,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 03:42:47,698 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-19 03:42:48,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:48,569 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-19 03:42:48,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-19 03:42:48,570 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-19 03:42:48,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:48,570 INFO L225 Difference]: With dead ends: 53 [2020-08-19 03:42:48,570 INFO L226 Difference]: Without dead ends: 48 [2020-08-19 03:42:48,571 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 03:42:48,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-19 03:42:48,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-19 03:42:48,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-19 03:42:48,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-19 03:42:48,575 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-19 03:42:48,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:48,575 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-19 03:42:48,575 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-19 03:42:48,575 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-19 03:42:48,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-19 03:42:48,576 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:48,576 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:48,576 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-19 03:42:48,576 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:48,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:48,577 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-19 03:42:48,577 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:48,577 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1824518886] [2020-08-19 03:42:48,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:48,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:49,631 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:49,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:49,636 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:49,636 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1824518886] [2020-08-19 03:42:49,636 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:49,636 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-19 03:42:49,636 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333125734] [2020-08-19 03:42:49,637 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-19 03:42:49,637 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:49,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-19 03:42:49,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 03:42:49,638 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-19 03:42:50,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:50,563 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-19 03:42:50,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-19 03:42:50,564 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-19 03:42:50,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:50,565 INFO L225 Difference]: With dead ends: 54 [2020-08-19 03:42:50,565 INFO L226 Difference]: Without dead ends: 49 [2020-08-19 03:42:50,566 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 03:42:50,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-19 03:42:50,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-19 03:42:50,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 03:42:50,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-19 03:42:50,570 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-19 03:42:50,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:50,570 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-19 03:42:50,570 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-19 03:42:50,570 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-19 03:42:50,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-19 03:42:50,571 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:50,571 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:50,571 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-19 03:42:50,571 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:50,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:50,571 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-19 03:42:50,572 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:50,572 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [330015194] [2020-08-19 03:42:50,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:50,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:51,694 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:51,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:51,700 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:51,700 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [330015194] [2020-08-19 03:42:51,701 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:51,701 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-19 03:42:51,701 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1986186349] [2020-08-19 03:42:51,701 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-19 03:42:51,701 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:51,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-19 03:42:51,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 03:42:51,702 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-19 03:42:52,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:52,687 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-19 03:42:52,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-19 03:42:52,688 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-19 03:42:52,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:52,689 INFO L225 Difference]: With dead ends: 55 [2020-08-19 03:42:52,689 INFO L226 Difference]: Without dead ends: 50 [2020-08-19 03:42:52,690 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 03:42:52,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-19 03:42:52,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-19 03:42:52,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-19 03:42:52,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-19 03:42:52,694 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-19 03:42:52,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:52,695 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-19 03:42:52,695 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-19 03:42:52,695 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-19 03:42:52,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-19 03:42:52,695 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:52,695 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:52,696 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-19 03:42:52,696 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:52,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:52,696 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-19 03:42:52,696 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:52,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [136340222] [2020-08-19 03:42:52,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:52,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:53,866 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:53,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:53,872 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:53,873 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [136340222] [2020-08-19 03:42:53,873 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:53,873 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-19 03:42:53,873 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472734716] [2020-08-19 03:42:53,874 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-19 03:42:53,874 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:53,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-19 03:42:53,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 03:42:53,875 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-19 03:42:54,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:54,894 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-19 03:42:54,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-19 03:42:54,895 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-19 03:42:54,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:54,895 INFO L225 Difference]: With dead ends: 56 [2020-08-19 03:42:54,895 INFO L226 Difference]: Without dead ends: 51 [2020-08-19 03:42:54,896 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 03:42:54,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-19 03:42:54,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-19 03:42:54,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-19 03:42:54,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-19 03:42:54,899 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-19 03:42:54,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:54,899 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-19 03:42:54,899 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-19 03:42:54,899 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-19 03:42:54,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-19 03:42:54,899 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:54,900 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:54,900 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-19 03:42:54,900 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:54,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:54,900 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-19 03:42:54,900 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:54,900 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [933807395] [2020-08-19 03:42:54,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:54,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:56,109 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:56,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:56,119 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:56,119 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [933807395] [2020-08-19 03:42:56,119 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:56,120 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-19 03:42:56,120 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1357050356] [2020-08-19 03:42:56,120 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-19 03:42:56,120 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:56,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-19 03:42:56,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 03:42:56,122 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-19 03:42:57,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:57,198 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-19 03:42:57,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-19 03:42:57,199 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-19 03:42:57,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:57,199 INFO L225 Difference]: With dead ends: 57 [2020-08-19 03:42:57,200 INFO L226 Difference]: Without dead ends: 52 [2020-08-19 03:42:57,200 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 03:42:57,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-19 03:42:57,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-19 03:42:57,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-19 03:42:57,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-19 03:42:57,204 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-19 03:42:57,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:57,205 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-19 03:42:57,205 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-19 03:42:57,205 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-19 03:42:57,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-19 03:42:57,205 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:57,205 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:57,206 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-19 03:42:57,206 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:57,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:57,206 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-19 03:42:57,206 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:57,206 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [941537248] [2020-08-19 03:42:57,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:57,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:58,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:42:58,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:42:58,544 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:42:58,544 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [941537248] [2020-08-19 03:42:58,544 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:42:58,545 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-19 03:42:58,545 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690973381] [2020-08-19 03:42:58,545 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-19 03:42:58,545 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:42:58,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-19 03:42:58,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 03:42:58,546 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-19 03:42:59,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:42:59,644 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-19 03:42:59,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-19 03:42:59,644 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-19 03:42:59,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:42:59,645 INFO L225 Difference]: With dead ends: 58 [2020-08-19 03:42:59,645 INFO L226 Difference]: Without dead ends: 53 [2020-08-19 03:42:59,646 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 03:42:59,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-19 03:42:59,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-19 03:42:59,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-19 03:42:59,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-19 03:42:59,650 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-19 03:42:59,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:42:59,650 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-19 03:42:59,650 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-19 03:42:59,650 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-19 03:42:59,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-19 03:42:59,651 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:42:59,651 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:42:59,651 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-19 03:42:59,651 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:42:59,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:42:59,652 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-19 03:42:59,652 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:42:59,652 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2137617615] [2020-08-19 03:42:59,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:42:59,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:01,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:43:01,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:01,039 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:43:01,039 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2137617615] [2020-08-19 03:43:01,039 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:43:01,039 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-19 03:43:01,039 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [117645597] [2020-08-19 03:43:01,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-19 03:43:01,040 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:43:01,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-19 03:43:01,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 03:43:01,041 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-19 03:43:02,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:43:02,268 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-19 03:43:02,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-19 03:43:02,270 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-19 03:43:02,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:43:02,270 INFO L225 Difference]: With dead ends: 59 [2020-08-19 03:43:02,270 INFO L226 Difference]: Without dead ends: 54 [2020-08-19 03:43:02,271 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 03:43:02,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-19 03:43:02,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-19 03:43:02,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-19 03:43:02,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-19 03:43:02,276 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-19 03:43:02,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:43:02,276 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-19 03:43:02,276 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-19 03:43:02,276 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-19 03:43:02,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-19 03:43:02,277 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:43:02,277 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:43:02,277 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-19 03:43:02,277 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:43:02,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:43:02,278 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-19 03:43:02,278 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:43:02,278 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1137809237] [2020-08-19 03:43:02,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:43:02,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:03,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:43:03,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:04,009 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:43:04,010 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1137809237] [2020-08-19 03:43:04,010 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:43:04,010 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-19 03:43:04,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559715699] [2020-08-19 03:43:04,012 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-19 03:43:04,012 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:43:04,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-19 03:43:04,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-19 03:43:04,016 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-19 03:43:05,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:43:05,285 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-19 03:43:05,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-19 03:43:05,286 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-19 03:43:05,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:43:05,287 INFO L225 Difference]: With dead ends: 60 [2020-08-19 03:43:05,287 INFO L226 Difference]: Without dead ends: 55 [2020-08-19 03:43:05,287 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-19 03:43:05,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-19 03:43:05,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-19 03:43:05,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-19 03:43:05,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-19 03:43:05,290 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-19 03:43:05,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:43:05,291 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-19 03:43:05,291 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-19 03:43:05,291 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-19 03:43:05,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-19 03:43:05,291 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:43:05,291 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:43:05,291 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-19 03:43:05,291 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:43:05,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:43:05,292 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-19 03:43:05,292 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:43:05,292 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1922966640] [2020-08-19 03:43:05,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:43:05,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:06,764 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:43:06,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:06,771 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:43:06,771 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1922966640] [2020-08-19 03:43:06,771 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:43:06,771 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-19 03:43:06,771 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511286783] [2020-08-19 03:43:06,772 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-19 03:43:06,772 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:43:06,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-19 03:43:06,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-19 03:43:06,772 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-19 03:43:08,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:43:08,100 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-19 03:43:08,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-19 03:43:08,100 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-19 03:43:08,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:43:08,101 INFO L225 Difference]: With dead ends: 61 [2020-08-19 03:43:08,101 INFO L226 Difference]: Without dead ends: 56 [2020-08-19 03:43:08,102 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-19 03:43:08,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-19 03:43:08,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-19 03:43:08,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-19 03:43:08,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-19 03:43:08,105 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-19 03:43:08,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:43:08,106 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-19 03:43:08,106 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-19 03:43:08,106 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-19 03:43:08,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-19 03:43:08,106 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:43:08,106 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:43:08,107 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-19 03:43:08,107 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:43:08,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:43:08,107 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-19 03:43:08,107 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:43:08,107 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [122698392] [2020-08-19 03:43:08,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:43:08,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:09,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:43:09,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:09,893 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:43:09,893 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [122698392] [2020-08-19 03:43:09,893 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:43:09,893 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-19 03:43:09,893 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351822882] [2020-08-19 03:43:09,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-19 03:43:09,894 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:43:09,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-19 03:43:09,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-19 03:43:09,894 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-19 03:43:11,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:43:11,319 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-19 03:43:11,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-19 03:43:11,319 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-19 03:43:11,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:43:11,320 INFO L225 Difference]: With dead ends: 62 [2020-08-19 03:43:11,320 INFO L226 Difference]: Without dead ends: 57 [2020-08-19 03:43:11,321 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-19 03:43:11,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-19 03:43:11,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-19 03:43:11,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-19 03:43:11,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-19 03:43:11,325 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-19 03:43:11,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:43:11,325 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-19 03:43:11,326 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-19 03:43:11,326 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-19 03:43:11,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-19 03:43:11,326 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:43:11,326 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:43:11,326 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-19 03:43:11,327 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:43:11,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:43:11,327 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-19 03:43:11,327 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:43:11,327 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1124321103] [2020-08-19 03:43:11,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:43:11,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:13,086 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:43:13,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:13,096 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:43:13,097 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1124321103] [2020-08-19 03:43:13,097 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:43:13,097 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-19 03:43:13,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1580985658] [2020-08-19 03:43:13,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-19 03:43:13,098 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:43:13,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-19 03:43:13,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-19 03:43:13,099 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-19 03:43:14,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 03:43:14,588 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-19 03:43:14,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-19 03:43:14,589 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-19 03:43:14,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 03:43:14,589 INFO L225 Difference]: With dead ends: 63 [2020-08-19 03:43:14,590 INFO L226 Difference]: Without dead ends: 58 [2020-08-19 03:43:14,590 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-19 03:43:14,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-19 03:43:14,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-19 03:43:14,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-19 03:43:14,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-19 03:43:14,594 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-19 03:43:14,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 03:43:14,595 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-19 03:43:14,595 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-19 03:43:14,595 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-19 03:43:14,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-19 03:43:14,595 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 03:43:14,596 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 03:43:14,596 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-19 03:43:14,596 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 03:43:14,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 03:43:14,596 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-19 03:43:14,596 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 03:43:14,597 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [153360032] [2020-08-19 03:43:14,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 03:43:14,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:16,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 03:43:16,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 03:43:16,314 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 03:43:16,315 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [153360032] [2020-08-19 03:43:16,315 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 03:43:16,316 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-19 03:43:16,316 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384789888] [2020-08-19 03:43:16,316 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-19 03:43:16,318 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 03:43:16,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-19 03:43:16,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-19 03:43:16,323 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states.